I'm hitting this as well on 16.04 using nouveau.  Here's my backtrace:


(gdb) thread apply all bt

Thread 41 (Thread 0x7fe9837fe700 (LWP 25333)):
#0  pthread_cond_wait@@GLIBC_2.3.2 ()
    at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007fea22cb2ae7 in base::SequencedWorkerPool::Inner::ThreadLoop (this=0x7fe9c803f620, 
    this_worker=this_worker@entry=0x7fe9a0008210)
    at ../../../../third_party/chromium/src/base/threading/sequenced_worker_pool.cc:902
#2  0x00007fea22cb3119 in base::SequencedWorkerPool::Worker::Run (this=0x7fe9a0008210)
    at ../../../../third_party/chromium/src/base/threading/sequenced_worker_pool.cc:535
#3  0x00007fea22cb32d0 in base::SimpleThread::ThreadMain (this=0x7fe9a0008210)
    at ../../../../third_party/chromium/src/base/threading/simple_thread.cc:66
#4  0x00007fea22cb049d in base::(anonymous namespace)::ThreadFunc (params=<optimized out>)
    at ../../../../third_party/chromium/src/base/threading/platform_thread_posix.cc:68
#5  0x00007fea571736fa in start_thread (arg=0x7fe9837fe700) at pthread_create.c:333
#6  0x00007fea5748fb5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 40 (Thread 0x7fe983fff700 (LWP 25332)):
#0  0x00007fea57483e8d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007fea56c5231c in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fea56c5242c in g_main_context_iteration ()
   from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fea582cfa7f in QEventDispatcherGlib::processEvents (this=0x7fe9780008c0, flags=...)
    at kernel/qeventdispatcher_glib.cpp:418
#4  0x00007fea58276dea in QEventLoop::exec (this=this@entry=0x7fe983ffee40, flags=..., 
    flags@entry=...) at kernel/qeventloop.cpp:204
#5  0x00007fea580938a4 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:503
#6  0x00007fea5809884e in QThreadPrivate::start (arg=0x561cc8a37fd0)
    at thread/qthread_unix.cpp:331
#7  0x00007fea571736fa in start_thread (arg=0x7fe983fff700) at pthread_create.c:333
#8  0x00007fea5748fb5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 39 (Thread 0x7fe998d35700 (LWP 25331)):
#0  pthread_cond_timedwait@@GLIBC_2.3.2 ()
    at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_timedwait.S:225
#1  0x00007fea58099a26 in QWaitConditionPrivate::wait_relative (time=30000, this=0x7fe988004f10)
    at thread/qwaitcondition_unix.cpp:126
#2  QWaitConditionPrivate::wait (time=30000, this=0x7fe988004f10)
    at thread/qwaitcondition_unix.cpp:134
---Type <return> to continue, or q <return> to quit---
#3  QWaitCondition::wait (this=this@entry=0x7fe988004c30, mutex=mutex@entry=0x7fe9880049d0, 
    time=30000) at thread/qwaitcondition_unix.cpp:208
#4  0x00007fea580954d3 in QThreadPoolThread::run (this=0x7fe988004c20)
    at thread/qthreadpool.cpp:127
#5  0x00007fea5809884e in QThreadPrivate::start (arg=0x7fe988004c20)
    at thread/qthread_unix.cpp:331
#6  0x00007fea571736fa in start_thread (arg=0x7fe998d35700) at pthread_create.c:333
#7  0x00007fea5748fb5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 38 (Thread 0x7fe999536700 (LWP 25330)):
#0  0x00007fea57483e8d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007fea56c5231c in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fea56c5242c in g_main_context_iteration ()
   from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fea582cfa7f in QEventDispatcherGlib::processEvents (this=0x7fe9880008c0, flags=...)
    at kernel/qeventdispatcher_glib.cpp:418
#4  0x00007fea58276dea in QEventLoop::exec (this=this@entry=0x7fe999535e40, flags=..., 
    flags@entry=...) at kernel/qeventloop.cpp:204
#5  0x00007fea580938a4 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:503
#6  0x00007fea5809884e in QThreadPrivate::start (arg=0x561cc8eea920)
    at thread/qthread_unix.cpp:331
#7  0x00007fea571736fa in start_thread (arg=0x7fe999536700) at pthread_create.c:333
#8  0x00007fea5748fb5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 37 (Thread 0x7fe99a3fb700 (LWP 25329)):
#0  0x00007fea57483e8d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007fea56c5231c in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fea56c5242c in g_main_context_iteration ()
   from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fea582cfa7f in QEventDispatcherGlib::processEvents (this=0x7fe9840008c0, flags=...)
    at kernel/qeventdispatcher_glib.cpp:418
#4  0x00007fea58276dea in QEventLoop::exec (this=this@entry=0x7fe99a3fae40, flags=..., 
    flags@entry=...) at kernel/qeventloop.cpp:204
#5  0x00007fea580938a4 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:503
#6  0x00007fea5809884e in QThreadPrivate::start (arg=0x561cc8a35a10)
    at thread/qthread_unix.cpp:331
#7  0x00007fea571736fa in start_thread (arg=0x7fe99a3fb700) at pthread_create.c:333
#8  0x00007fea5748fb5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109
---Type <return> to continue, or q <return> to quit---

Thread 36 (Thread 0x7fe99abfc700 (LWP 25328)):
#0  pthread_cond_timedwait@@GLIBC_2.3.2 ()
    at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_timedwait.S:225
#1  0x00007fea22ca6e62 in base::ConditionVariable::TimedWait (this=this@entry=0x7fe9f0005238, 
    max_time=...)
    at ../../../../third_party/chromium/src/base/synchronization/condition_variable_posix.cc:117
#2  0x00007fea22cb5d00 in base::PosixDynamicThreadPool::WaitForTask (this=0x7fe9f00051e0)
    at ../../../../third_party/chromium/src/base/threading/worker_pool_posix.cc:180
#3  0x00007fea22cb6213 in base::(anonymous namespace)::WorkerThread::ThreadMain (
    this=0x7fe9c8171f50)
    at ../../../../third_party/chromium/src/base/threading/worker_pool_posix.cc:86
#4  0x00007fea22cb049d in base::(anonymous namespace)::ThreadFunc (params=<optimized out>)
    at ../../../../third_party/chromium/src/base/threading/platform_thread_posix.cc:68
#5  0x00007fea571736fa in start_thread (arg=0x7fe99abfc700) at pthread_create.c:333
#6  0x00007fea5748fb5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 35 (Thread 0x7fe99b3fd700 (LWP 25318)):
#0  pthread_cond_timedwait@@GLIBC_2.3.2 ()
    at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_timedwait.S:225
#1  0x00007fea22ca6e62 in base::ConditionVariable::TimedWait (this=this@entry=0x561cc8787000, 
    max_time=...)
    at ../../../../third_party/chromium/src/base/synchronization/condition_variable_posix.cc:117
#2  0x00007fea22cb2957 in base::SequencedWorkerPool::Inner::ThreadLoop (this=0x561cc8786fd0, 
    this_worker=this_worker@entry=0x7fe99c00df60)
    at ../../../../third_party/chromium/src/base/threading/sequenced_worker_pool.cc:905
#3  0x00007fea22cb3119 in base::SequencedWorkerPool::Worker::Run (this=0x7fe99c00df60)
    at ../../../../third_party/chromium/src/base/threading/sequenced_worker_pool.cc:535
#4  0x00007fea22cb32d0 in base::SimpleThread::ThreadMain (this=0x7fe99c00df60)
    at ../../../../third_party/chromium/src/base/threading/simple_thread.cc:66
#5  0x00007fea22cb049d in base::(anonymous namespace)::ThreadFunc (params=<optimized out>)
    at ../../../../third_party/chromium/src/base/threading/platform_thread_posix.cc:68
#6  0x00007fea571736fa in start_thread (arg=0x7fe99b3fd700) at pthread_create.c:333
#7  0x00007fea5748fb5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 34 (Thread 0x7fe99bfff700 (LWP 25315)):
#0  pthread_cond_wait@@GLIBC_2.3.2 ()
    at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
---Type <return> to continue, or q <return> to quit---
#1  0x00007fea22cb2ae7 in base::SequencedWorkerPool::Inner::ThreadLoop (this=0x7fe9c803f620, 
    this_worker=this_worker@entry=0x7fe9c802b440)
    at ../../../../third_party/chromium/src/base/threading/sequenced_worker_pool.cc:902
#2  0x00007fea22cb3119 in base::SequencedWorkerPool::Worker::Run (this=0x7fe9c802b440)
    at ../../../../third_party/chromium/src/base/threading/sequenced_worker_pool.cc:535
#3  0x00007fea22cb32d0 in base::SimpleThread::ThreadMain (this=0x7fe9c802b440)
    at ../../../../third_party/chromium/src/base/threading/simple_thread.cc:66
#4  0x00007fea22cb049d in base::(anonymous namespace)::ThreadFunc (params=<optimized out>)
    at ../../../../third_party/chromium/src/base/threading/platform_thread_posix.cc:68
#5  0x00007fea571736fa in start_thread (arg=0x7fe99bfff700) at pthread_create.c:333
#6  0x00007fea5748fb5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 33 (Thread 0x7fe9bcff9700 (LWP 25314)):
#0  pthread_cond_wait@@GLIBC_2.3.2 ()
    at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007fea22cb2ae7 in base::SequencedWorkerPool::Inner::ThreadLoop (this=0x7fe9c803f620, 
    this_worker=this_worker@entry=0x7fe9c8042070)
    at ../../../../third_party/chromium/src/base/threading/sequenced_worker_pool.cc:902
#2  0x00007fea22cb3119 in base::SequencedWorkerPool::Worker::Run (this=0x7fe9c8042070)
    at ../../../../third_party/chromium/src/base/threading/sequenced_worker_pool.cc:535
#3  0x00007fea22cb32d0 in base::SimpleThread::ThreadMain (this=0x7fe9c8042070)
    at ../../../../third_party/chromium/src/base/threading/simple_thread.cc:66
#4  0x00007fea22cb049d in base::(anonymous namespace)::ThreadFunc (params=<optimized out>)
    at ../../../../third_party/chromium/src/base/threading/platform_thread_posix.cc:68
#5  0x00007fea571736fa in start_thread (arg=0x7fe9bcff9700) at pthread_create.c:333
#6  0x00007fea5748fb5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 31 (Thread 0x7fe9bd7fa700 (LWP 25294)):
#0  pthread_cond_timedwait@@GLIBC_2.3.2 ()
    at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_timedwait.S:225
#1  0x00007fea22ca6e62 in base::ConditionVariable::TimedWait (this=this@entry=0x561cc8787000, 
    max_time=...)
    at ../../../../third_party/chromium/src/base/synchronization/condition_variable_posix.cc:117
#2  0x00007fea22cb2957 in base::SequencedWorkerPool::Inner::ThreadLoop (this=0x561cc8786fd0, 
    this_worker=this_worker@entry=0x561cc8930870)
    at ../../../../third_party/chromium/src/base/threading/sequenced_worker_pool.cc:905
#3  0x00007fea22cb3119 in base::SequencedWorkerPool::Worker::Run (this=0x561cc8930870)
    at ../../../../third_party/chromium/src/base/threading/sequenced_worker_pool.cc:535
---Type <return> to continue, or q <return> to quit---
#4  0x00007fea22cb32d0 in base::SimpleThread::ThreadMain (this=0x561cc8930870)
    at ../../../../third_party/chromium/src/base/threading/simple_thread.cc:66
#5  0x00007fea22cb049d in base::(anonymous namespace)::ThreadFunc (params=<optimized out>)
    at ../../../../third_party/chromium/src/base/threading/platform_thread_posix.cc:68
#6  0x00007fea571736fa in start_thread (arg=0x7fe9bd7fa700) at pthread_create.c:333
#7  0x00007fea5748fb5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 30 (Thread 0x7fe9bdffb700 (LWP 25293)):
#0  0x00007fea57490153 in epoll_wait () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007fea2331c0dd in epoll_dispatch (base=0x7fe9a80013b0, arg=0x7fe9a80019e0, 
    tv=<optimized out>)
    at ../../../../third_party/chromium/src/base/third_party/libevent/epoll.c:198
#2  0x00007fea2331a2d0 in event_base_loop (base=0x7fe9a80013b0, flags=flags@entry=1)
    at ../../../../third_party/chromium/src/base/third_party/libevent/event.c:531
#3  0x00007fea22c5e3b9 in base::MessagePumpLibevent::Run (this=0x7fe9a8001340, 
    delegate=0x7fe9a4001880)
    at ../../../../third_party/chromium/src/base/message_loop/message_pump_libevent.cc:256
#4  0x00007fea22c9b5a8 in base::RunLoop::Run (this=this@entry=0x7fe9bdffae30)
    at ../../../../third_party/chromium/src/base/run_loop.cc:35
#5  0x00007fea22c86245 in base::MessageLoop::Run (this=<optimized out>)
    at ../../../../third_party/chromium/src/base/message_loop/message_loop.cc:293
#6  0x00007fea22cb370a in base::Thread::Run (message_loop=<optimized out>, this=0x7fe9a4001418)
    at ../../../../third_party/chromium/src/base/threading/thread.cc:202
#7  base::Thread::ThreadMain (this=0x7fe9a4001418)
    at ../../../../third_party/chromium/src/base/threading/thread.cc:254
#8  0x00007fea22cb049d in base::(anonymous namespace)::ThreadFunc (params=<optimized out>)
    at ../../../../third_party/chromium/src/base/threading/platform_thread_posix.cc:68
#9  0x00007fea571736fa in start_thread (arg=0x7fe9bdffb700) at pthread_create.c:333
#10 0x00007fea5748fb5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 29 (Thread 0x7fe9be7fc700 (LWP 25292)):
#0  0x00007fea406fe06c in ?? () from /usr/lib/x86_64-linux-gnu/libdrm_nouveau.so.2
#1  0x00007fea406fe729 in ?? () from /usr/lib/x86_64-linux-gnu/libdrm_nouveau.so.2
#2  0x00007fea40e10926 in ?? () from /usr/lib/x86_64-linux-gnu/dri/nouveau_dri.so
#3  0x00007fea40aaf069 in ?? () from /usr/lib/x86_64-linux-gnu/dri/nouveau_dri.so
#4  0x00007fea232db0ed in gfx::GLFenceARB::GLFenceARB (this=0x7fe9a4156f20)
    at ../../../../third_party/chromium/src/ui/gl/gl_fence_arb.cc:27
#5  0x00007fea232dac8b in gfx::GLFence::Create ()
---Type <return> to continue, or q <return> to quit---
    at ../../../../third_party/chromium/src/ui/gl/gl_fence.cc:51
#6  0x00007fea235fe6f3 in gpu::gles2::CommandsCompletedQuery::End (this=0x7fe9a4185750, 
    submit_count=2)
    at ../../../../third_party/chromium/src/gpu/command_buffer/service/query_manager.cc:511
#7  0x00007fea235a1891 in gpu::gles2::GLES2DecoderImpl::HandleEndQueryEXT (this=0x7fe9a41410c0, 
    immediate_data_size=<optimized out>, cmd_data=<optimized out>)
    at ../../../../third_party/chromium/src/gpu/command_buffer/service/gles2_cmd_decoder.cc:13040
#8  0x00007fea235d07f2 in gpu::gles2::GLES2DecoderImpl::DoCommandsImpl<false> (
    this=0x7fe9a41410c0, num_commands=<optimized out>, buffer=<optimized out>, num_entries=112, 
    entries_processed=<optimized out>)
    at ../../../../third_party/chromium/src/gpu/command_buffer/service/gles2_cmd_decoder.cc:4432
#9  0x00007fea23584f1a in gpu::CommandParser::ProcessCommands (this=0x7fe9a4147900, 
    num_commands=num_commands@entry=20)
    at ../../../../third_party/chromium/src/gpu/command_buffer/service/cmd_parser.cc:54
#10 0x00007fea235e411a in gpu::GpuScheduler::PutChanged (this=0x7fe9a4141b90)
    at ../../../../third_party/chromium/src/gpu/command_buffer/service/gpu_scheduler.cc:62
#11 0x00007fea230a5bae in content::GpuCommandBufferStub::OnAsyncFlush (
    this=this@entry=0x7fe9a413e530, put_offset=7331, flush_count=237, 
    latency_info=std::vector of length 0, capacity 0)
    at ../../../../third_party/chromium/src/content/common/gpu/gpu_command_buffer_stub.cc:827
#12 0x00007fea230aa5f0 in base::DispatchToMethodImpl<content::GpuCommandBufferStub*, void (content::GpuCommandBufferStub::*)(int, unsigned int, std::vector<ui::LatencyInfo, std::allocator<ui::LatencyInfo> > const&), int, unsigned int, std::vector<ui::LatencyInfo, std::allocator<ui::LatencyInfo> >, 0ul, 1ul, 2ul> (arg=std::tuple containing = {...}, method=<optimized out>, 
    obj=<synthetic pointer>) at ../../../../third_party/chromium/src/base/tuple.h:203
#13 base::DispatchToMethod<content::GpuCommandBufferStub*, void (content::GpuCommandBufferStub::*)(int, unsigned int, std::vector<ui::LatencyInfo, std::allocator<ui::LatencyInfo> > const&), int, unsigned int, std::vector<ui::LatencyInfo, std::allocator<ui::LatencyInfo> > > (
    arg=std::tuple containing = {...}, method=<optimized out>, obj=<synthetic pointer>)
    at ../../../../third_party/chromium/src/base/tuple.h:210
#14 IPC::DispatchToMethod<content::GpuCommandBufferStub, void (content::GpuCommandBufferStub::*)(int, unsigned int, std::vector<ui::LatencyInfo, std::allocator<ui::LatencyInfo> > const&), void, std::tuple<int, unsigned int, std::vector<ui::LatencyInfo, std::allocator<ui::LatencyInfo> > > >
    (tuple=std::tuple containing = {...}, method=
    (void (content::GpuCommandBufferStub::*)(content::GpuCommandBufferStub * const, int, unsigned int, const std::vector<ui::LatencyInfo, std::allocator<ui::LatencyInfo> > &)) 0x7fea230a5b30 <content::GpuCommandBufferStub::OnAsyncFlush(int, unsigned int, std::vector<ui::LatencyInfo, std::al---Type <return> to continue, or q <return> to quit---
locator<ui::LatencyInfo> > const&)>, obj=0x7fe9a413e530)
    at ../../../../third_party/chromium/src/ipc/ipc_message_templates.h:24
#15 IPC::MessageT<GpuCommandBufferMsg_AsyncFlush_Meta, std::tuple<int, unsigned int, std::vector<ui::LatencyInfo, std::allocator<ui::LatencyInfo> > >, void>::Dispatch<content::GpuCommandBufferStub, content::GpuCommandBufferStub, void, void (content::GpuCommandBufferStub::*)(int, unsigned int, std::vector<ui::LatencyInfo, std::allocator<ui::LatencyInfo> > const&)> (
    func=<optimized out>, parameter=0x0, sender=0x7fe9a413e530, obj=0x7fe9a413e530, 
    msg=0x7fe9a8004570) at ../../../../third_party/chromium/src/ipc/ipc_message_templates.h:118
#16 content::GpuCommandBufferStub::OnMessageReceived (this=0x7fe9a413e530, message=...)
    at ../../../../third_party/chromium/src/content/common/gpu/gpu_command_buffer_stub.cc:309
#17 0x00007fea23a0b1c7 in IPC::MessageRouter::RouteMessage (this=this@entry=0x7fe9a413c420, 
    msg=...) at ../../../../third_party/chromium/src/ipc/message_router.cc:52
#18 0x00007fea230a3e85 in content::GpuChannel::HandleMessageHelper (this=0x7fe9a413c390, 
    msg=...) at ../../../../third_party/chromium/src/content/common/gpu/gpu_channel.cc:826
#19 0x00007fea230a3f2e in content::GpuChannel::HandleMessage (this=0x7fe9a413c390, 
    message_queue=...)
    at ../../../../third_party/chromium/src/content/common/gpu/gpu_channel.cc:808
#20 0x00007fea230a205c in base::internal::RunnableAdapter<void (content::GpuChannel::*)(scoped_refptr<content::GpuChannelMessageQueue> const&)>::Run<content::GpuChannelMessageQueue*>(content::GpuChannel*, content::GpuChannelMessageQueue*&&) (object=<optimized out>, 
    this=<synthetic pointer>) at ../../../../third_party/chromium/src/base/bind_internal.h:181
#21 base::internal::InvokeHelper<true, void, base::internal::RunnableAdapter<void (content::GpuChannel::*)(scoped_refptr<content::GpuChannelMessageQueue> const&)> >::MakeItSo<base::WeakPtr<content::GpuChannel>, content::GpuChannelMessageQueue*>(base::internal::RunnableAdapter<void (content::GpuChannel::*)(scoped_refptr<content::GpuChannelMessageQueue> const&)>, base::WeakPtr<content::GpuChannel>, content::GpuChannelMessageQueue*&&) (weak_ptr=..., runnable=...)
    at ../../../../third_party/chromium/src/base/bind_internal.h:314
#22 base::internal::Invoker<base::IndexSequence<0ul, 1ul>, base::internal::BindState<base::internal::RunnableAdapter<void (content::GpuChannel::*)(scoped_refptr<content::GpuChannelMessageQueue> const&)>, void (content::GpuChannel*, scoped_refptr<content::GpuChannelMessageQueue> const&), base::WeakPtr<content::GpuChannel>, scoped_refptr<content::GpuChannelMessageQueue> const&>, base::internal::InvokeHelper<true, void, base::internal::RunnableAdapter<void (content::GpuChannel::*)(scoped_refptr<content::GpuChannelMessageQueue> const&)> >, void ()>::Run(base::internal::BindStateBase*) (base=<optimized out>) at ../../../../third_party/chromium/src/base/bind_internal.h:354
#23 0x00007fea22c6a68d in base::Callback<void ()>::Run() const (this=0x7fe9be7fbc88)
    at ../../../../third_party/chromium/src/base/callback.h:394
#24 base::debug::TaskAnnotator::RunTask (this=this@entry=0x7fe9c8022f88, 
    queue_function=queue_function@entry=0x7fea26260688 "MessageLoop::PostTask", 
---Type <return> to continue, or q <return> to quit---
    pending_task=...) at ../../../../third_party/chromium/src/base/debug/task_annotator.cc:51
#25 0x00007fea22c86a09 in base::MessageLoop::RunTask (this=this@entry=0x7fe9c8022e10, 
    pending_task=...)
    at ../../../../third_party/chromium/src/base/message_loop/message_loop.cc:476
#26 0x00007fea22c8702d in base::MessageLoop::DeferOrRunPendingTask (
    this=this@entry=0x7fe9c8022e10, pending_task=...)
    at ../../../../third_party/chromium/src/base/message_loop/message_loop.cc:485
#27 0x00007fea22c872f8 in base::MessageLoop::DoWork (this=0x7fe9c8022e10)
    at ../../../../third_party/chromium/src/base/message_loop/message_loop.cc:597
#28 0x00007fea22c88d19 in base::MessagePumpDefault::Run (this=0x7fe9a4001340, 
    delegate=0x7fe9c8022e10)
    at ../../../../third_party/chromium/src/base/message_loop/message_pump_default.cc:33
#29 0x00007fea22c9b5a8 in base::RunLoop::Run (this=this@entry=0x7fe9be7fbe30)
    at ../../../../third_party/chromium/src/base/run_loop.cc:35
#30 0x00007fea22c86245 in base::MessageLoop::Run (this=<optimized out>)
    at ../../../../third_party/chromium/src/base/message_loop/message_loop.cc:293
#31 0x00007fea22cb370a in base::Thread::Run (message_loop=<optimized out>, this=0x7fe9c8022a70)
    at ../../../../third_party/chromium/src/base/threading/thread.cc:202
#32 base::Thread::ThreadMain (this=0x7fe9c8022a70)
    at ../../../../third_party/chromium/src/base/threading/thread.cc:254
#33 0x00007fea22cb049d in base::(anonymous namespace)::ThreadFunc (params=<optimized out>)
    at ../../../../third_party/chromium/src/base/threading/platform_thread_posix.cc:68
#34 0x00007fea571736fa in start_thread (arg=0x7fe9be7fc700) at pthread_create.c:333
#35 0x00007fea5748fb5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 28 (Thread 0x7fe9beffd700 (LWP 25291)):
#0  pthread_cond_wait@@GLIBC_2.3.2 ()
    at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007fea234d4b8d in cc::SingleThreadTaskGraphRunner::Run (this=0x561cc893abe0)
    at ../../../../third_party/chromium/src/cc/raster/single_thread_task_graph_runner.cc:123
#2  0x00007fea22cb31ae in base::DelegateSimpleThread::Run (this=0x561cc88e7200)
    at ../../../../third_party/chromium/src/base/threading/simple_thread.cc:87
#3  0x00007fea22cb32d0 in base::SimpleThread::ThreadMain (this=0x561cc88e7200)
    at ../../../../third_party/chromium/src/base/threading/simple_thread.cc:66
#4  0x00007fea22cb049d in base::(anonymous namespace)::ThreadFunc (params=<optimized out>)
    at ../../../../third_party/chromium/src/base/threading/platform_thread_posix.cc:68
#5  0x00007fea571736fa in start_thread (arg=0x7fe9beffd700) at pthread_create.c:333
#6  0x00007fea5748fb5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109
---Type <return> to continue, or q <return> to quit---

Thread 27 (Thread 0x7fe9bf7fe700 (LWP 25290)):
#0  0x00007fea57483e8d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007fea1f960201 in ?? () from /usr/lib/x86_64-linux-gnu/libpulse.so.0
#2  0x00007fea1f951a01 in pa_mainloop_poll () from /usr/lib/x86_64-linux-gnu/libpulse.so.0
#3  0x00007fea1f9520ae in pa_mainloop_iterate () from /usr/lib/x86_64-linux-gnu/libpulse.so.0
#4  0x00007fea1f952160 in pa_mainloop_run () from /usr/lib/x86_64-linux-gnu/libpulse.so.0
#5  0x00007fea1f960149 in ?? () from /usr/lib/x86_64-linux-gnu/libpulse.so.0
#6  0x00007fea1f4f8678 in ?? () from /usr/lib/x86_64-linux-gnu/pulseaudio/libpulsecommon-8.0.so
#7  0x00007fea571736fa in start_thread (arg=0x7fe9bf7fe700) at pthread_create.c:333
#8  0x00007fea5748fb5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 26 (Thread 0x7fe9bffff700 (LWP 25289)):
#0  pthread_cond_timedwait@@GLIBC_2.3.2 ()
    at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_timedwait.S:225
#1  0x00007fea22ca6e62 in base::ConditionVariable::TimedWait (this=this@entry=0x7fe9bfffed20, 
    max_time=...)
    at ../../../../third_party/chromium/src/base/synchronization/condition_variable_posix.cc:117
#2  0x00007fea22ca76ed in base::WaitableEvent::TimedWait (this=this@entry=0x7fe9b80012c0, 
    max_time=...)
    at ../../../../third_party/chromium/src/base/synchronization/waitable_event_posix.cc:214
#3  0x00007fea22c88d98 in base::MessagePumpDefault::Run (this=0x7fe9b80012b0, 
    delegate=0x561cc8911420)
    at ../../../../third_party/chromium/src/base/message_loop/message_pump_default.cc:57
#4  0x00007fea22c9b5a8 in base::RunLoop::Run (this=this@entry=0x7fe9bfffee30)
    at ../../../../third_party/chromium/src/base/run_loop.cc:35
#5  0x00007fea22c86245 in base::MessageLoop::Run (this=<optimized out>)
    at ../../../../third_party/chromium/src/base/message_loop/message_loop.cc:293
#6  0x00007fea22cb370a in base::Thread::Run (message_loop=<optimized out>, this=0x561cc8911260)
    at ../../../../third_party/chromium/src/base/threading/thread.cc:202
#7  base::Thread::ThreadMain (this=0x561cc8911260)
    at ../../../../third_party/chromium/src/base/threading/thread.cc:254
#8  0x00007fea22cb049d in base::(anonymous namespace)::ThreadFunc (params=<optimized out>)
    at ../../../../third_party/chromium/src/base/threading/platform_thread_posix.cc:68
#9  0x00007fea571736fa in start_thread (arg=0x7fe9bffff700) at pthread_create.c:333
#10 0x00007fea5748fb5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 25 (Thread 0x7fe9dcff9700 (LWP 25288)):
---Type <return> to continue, or q <return> to quit---
#0  pthread_cond_wait@@GLIBC_2.3.2 ()
    at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007fea234d4b8d in cc::SingleThreadTaskGraphRunner::Run (this=0x561cc88fa180)
    at ../../../../third_party/chromium/src/cc/raster/single_thread_task_graph_runner.cc:123
#2  0x00007fea22cb31ae in base::DelegateSimpleThread::Run (this=0x561cc88db6e0)
    at ../../../../third_party/chromium/src/base/threading/simple_thread.cc:87
#3  0x00007fea22cb32d0 in base::SimpleThread::ThreadMain (this=0x561cc88db6e0)
    at ../../../../third_party/chromium/src/base/threading/simple_thread.cc:66
#4  0x00007fea22cb049d in base::(anonymous namespace)::ThreadFunc (params=<optimized out>)
    at ../../../../third_party/chromium/src/base/threading/platform_thread_posix.cc:68
#5  0x00007fea571736fa in start_thread (arg=0x7fe9dcff9700) at pthread_create.c:333
#6  0x00007fea5748fb5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 24 (Thread 0x7fe9dd7fa700 (LWP 25287)):
#0  pthread_cond_wait@@GLIBC_2.3.2 ()
    at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007fea22ca765d in base::WaitableEvent::TimedWait (this=this@entry=0x7fe9c00012c0, 
    max_time=...)
    at ../../../../third_party/chromium/src/base/synchronization/waitable_event_posix.cc:216
#2  0x00007fea22ca7725 in base::WaitableEvent::Wait (this=this@entry=0x7fe9c00012c0)
    at ../../../../third_party/chromium/src/base/synchronization/waitable_event_posix.cc:156
#3  0x00007fea22c88d5d in base::MessagePumpDefault::Run (this=0x7fe9c00012b0, 
    delegate=0x561cc87adc20)
    at ../../../../third_party/chromium/src/base/message_loop/message_pump_default.cc:53
#4  0x00007fea22c9b5a8 in base::RunLoop::Run (this=this@entry=0x7fe9dd7f9e30)
    at ../../../../third_party/chromium/src/base/run_loop.cc:35
#5  0x00007fea22c86245 in base::MessageLoop::Run (this=<optimized out>)
    at ../../../../third_party/chromium/src/base/message_loop/message_loop.cc:293
#6  0x00007fea22cb370a in base::Thread::Run (message_loop=<optimized out>, this=0x561cc87adb00)
    at ../../../../third_party/chromium/src/base/threading/thread.cc:202
#7  base::Thread::ThreadMain (this=0x561cc87adb00)
    at ../../../../third_party/chromium/src/base/threading/thread.cc:254
#8  0x00007fea22cb049d in base::(anonymous namespace)::ThreadFunc (params=<optimized out>)
    at ../../../../third_party/chromium/src/base/threading/platform_thread_posix.cc:68
#9  0x00007fea571736fa in start_thread (arg=0x7fe9dd7fa700) at pthread_create.c:333
#10 0x00007fea5748fb5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 23 (Thread 0x7fe9ddffb700 (LWP 25286)):
---Type <return> to continue, or q <return> to quit---
#0  pthread_cond_wait@@GLIBC_2.3.2 ()
    at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007fea23da80f0 in mojo::edk::Waiter::Wait (this=this@entry=0x7fe9ddffa960, 
    deadline=deadline@entry=18446744073709551615, context=context@entry=0x7fe9ddffa910)
    at ../../../../third_party/chromium/src/mojo/edk/system/waiter.cc:64
#2  0x00007fea23d93b52 in mojo::edk::Core::WaitManyInternal (this=<optimized out>, 
    handles=handles@entry=0x7fe9ddffab5c, signals=signals@entry=0x7fe9ddffab58, 
    num_handles=num_handles@entry=1, deadline=18446744073709551615, 
    result_index=result_index@entry=0x7fe9ddffab6c, signals_states=0x0)
    at ../../../../third_party/chromium/src/mojo/edk/system/core.cc:748
#3  0x00007fea23d93c22 in mojo::edk::Core::Wait (this=<optimized out>, handle=7, 
    signals=signals@entry=1, deadline=<optimized out>, signals_state=signals_state@entry=0x0)
    at ../../../../third_party/chromium/src/mojo/edk/system/core.cc:289
#4  0x00007fea23d862c9 in MojoWait (handle=<optimized out>, signals=signals@entry=1, 
    deadline=<optimized out>, signals_state=signals_state@entry=0x0)
    at ../../../../third_party/chromium/src/mojo/edk/embedder/entrypoints.cc:32
#5  0x00007fea23d7f44e in mojo::Wait (signals_state=0x0, deadline=<optimized out>, signals=1, 
    handle=...) at ../../../../third_party/chromium/src/mojo/public/cpp/system/handle.h:179
#6  mojo::common::MessagePumpMojo::WaitForReadyHandles (this=this@entry=0x7fe9cc001340, 
    run_state=...)
    at ../../../../third_party/chromium/src/mojo/message_pump/message_pump_mojo.cc:244
#7  0x00007fea23d80774 in mojo::common::MessagePumpMojo::DoInternalWork (this=0x7fe9cc001340, 
    run_state=..., block=true)
    at ../../../../third_party/chromium/src/mojo/message_pump/message_pump_mojo.cc:209
#8  0x00007fea23d807c5 in mojo::common::MessagePumpMojo::DoRunLoop (
    this=this@entry=0x7fe9cc001340, run_state=run_state@entry=0x7fe9ddffadb0, 
    delegate=delegate@entry=0x561cc7962390)
    at ../../../../third_party/chromium/src/mojo/message_pump/message_pump_mojo.cc:176
#9  0x00007fea23d80899 in mojo::common::MessagePumpMojo::Run (this=0x7fe9cc001340, 
    delegate=0x561cc7962390)
    at ../../../../third_party/chromium/src/mojo/message_pump/message_pump_mojo.cc:146
#10 0x00007fea22c9b5a8 in base::RunLoop::Run (this=this@entry=0x7fe9ddffae30)
    at ../../../../third_party/chromium/src/base/run_loop.cc:35
#11 0x00007fea22c86245 in base::MessageLoop::Run (this=<optimized out>)
    at ../../../../third_party/chromium/src/base/message_loop/message_loop.cc:293
#12 0x00007fea22cb370a in base::Thread::Run (message_loop=<optimized out>, this=0x561cc88ff150)
    at ../../../../third_party/chromium/src/base/threading/thread.cc:202
#13 base::Thread::ThreadMain (this=0x561cc88ff150)
---Type <return> to continue, or q <return> to quit---
    at ../../../../third_party/chromium/src/base/threading/thread.cc:254
#14 0x00007fea22cb049d in base::(anonymous namespace)::ThreadFunc (params=<optimized out>)
    at ../../../../third_party/chromium/src/base/threading/platform_thread_posix.cc:68
#15 0x00007fea571736fa in start_thread (arg=0x7fe9ddffb700) at pthread_create.c:333
#16 0x00007fea5748fb5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 22 (Thread 0x7fe9de7fc700 (LWP 25285)):
#0  0x00007fea57490153 in epoll_wait () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007fea2331c0dd in epoll_dispatch (base=0x7fe9c8001320, arg=0x7fe9c8001950, 
    tv=<optimized out>)
    at ../../../../third_party/chromium/src/base/third_party/libevent/epoll.c:198
#2  0x00007fea2331a2d0 in event_base_loop (base=0x7fe9c8001320, flags=flags@entry=1)
    at ../../../../third_party/chromium/src/base/third_party/libevent/event.c:531
#3  0x00007fea22c5e472 in base::MessagePumpLibevent::Run (this=0x7fe9c80012b0, 
    delegate=0x561cc89129e0)
    at ../../../../third_party/chromium/src/base/message_loop/message_pump_libevent.cc:266
#4  0x00007fea22c9b5a8 in base::RunLoop::Run (this=this@entry=0x7fe9de7fba10)
    at ../../../../third_party/chromium/src/base/run_loop.cc:35
#5  0x00007fea22c86245 in base::MessageLoop::Run (this=this@entry=0x561cc89129e0)
    at ../../../../third_party/chromium/src/base/message_loop/message_loop.cc:293
#6  0x00007fea22cb3508 in base::Thread::Run (this=this@entry=0x561cc88ffd20, 
    message_loop=message_loop@entry=0x561cc89129e0)
    at ../../../../third_party/chromium/src/base/threading/thread.cc:202
#7  0x00007fea22d51d68 in content::BrowserThreadImpl::IOThreadRun (
    this=this@entry=0x561cc88ffd20, message_loop=message_loop@entry=0x561cc89129e0)
    at ../../../../third_party/chromium/src/content/browser/browser_thread_impl.cc:215
#8  0x00007fea22d526fd in content::BrowserThreadImpl::Run (this=0x561cc88ffd20, 
    message_loop=0x561cc89129e0)
    at ../../../../third_party/chromium/src/content/browser/browser_thread_impl.cc:251
#9  0x00007fea22cb3788 in base::Thread::ThreadMain (this=0x561cc88ffd20)
    at ../../../../third_party/chromium/src/base/threading/thread.cc:254
#10 0x00007fea22cb049d in base::(anonymous namespace)::ThreadFunc (params=<optimized out>)
    at ../../../../third_party/chromium/src/base/threading/platform_thread_posix.cc:68
#11 0x00007fea571736fa in start_thread (arg=0x7fe9de7fc700) at pthread_create.c:333
#12 0x00007fea5748fb5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 21 (Thread 0x7fe9deffd700 (LWP 25284)):
#0  pthread_cond_wait@@GLIBC_2.3.2 ()
---Type <return> to continue, or q <return> to quit---
    at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007fea22ca765d in base::WaitableEvent::TimedWait (this=this@entry=0x7fe9d4001350, 
    max_time=...)
    at ../../../../third_party/chromium/src/base/synchronization/waitable_event_posix.cc:216
#2  0x00007fea22ca7725 in base::WaitableEvent::Wait (this=this@entry=0x7fe9d4001350)
    at ../../../../third_party/chromium/src/base/synchronization/waitable_event_posix.cc:156
#3  0x00007fea22c88d5d in base::MessagePumpDefault::Run (this=0x7fe9d4001340, 
    delegate=0x561cc8903540)
    at ../../../../third_party/chromium/src/base/message_loop/message_pump_default.cc:53
#4  0x00007fea22c9b5a8 in base::RunLoop::Run (this=this@entry=0x7fe9deffca10)
    at ../../../../third_party/chromium/src/base/run_loop.cc:35
#5  0x00007fea22c86245 in base::MessageLoop::Run (this=this@entry=0x561cc8903540)
    at ../../../../third_party/chromium/src/base/message_loop/message_loop.cc:293
#6  0x00007fea22cb3508 in base::Thread::Run (this=this@entry=0x561cc88ef840, 
    message_loop=message_loop@entry=0x561cc8903540)
    at ../../../../third_party/chromium/src/base/threading/thread.cc:202
#7  0x00007fea22d51cb8 in content::BrowserThreadImpl::CacheThreadRun (
    this=this@entry=0x561cc88ef840, message_loop=message_loop@entry=0x561cc8903540)
    at ../../../../third_party/chromium/src/content/browser/browser_thread_impl.cc:209
#8  0x00007fea22d5273d in content::BrowserThreadImpl::Run (this=0x561cc88ef840, 
    message_loop=0x561cc8903540)
    at ../../../../third_party/chromium/src/content/browser/browser_thread_impl.cc:249
#9  0x00007fea22cb3788 in base::Thread::ThreadMain (this=0x561cc88ef840)
    at ../../../../third_party/chromium/src/base/threading/thread.cc:254
#10 0x00007fea22cb049d in base::(anonymous namespace)::ThreadFunc (params=<optimized out>)
    at ../../../../third_party/chromium/src/base/threading/platform_thread_posix.cc:68
#11 0x00007fea571736fa in start_thread (arg=0x7fe9deffd700) at pthread_create.c:333
#12 0x00007fea5748fb5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 20 (Thread 0x7fe9df7fe700 (LWP 25283)):
#0  pthread_cond_wait@@GLIBC_2.3.2 ()
    at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007fea22ca765d in base::WaitableEvent::TimedWait (this=this@entry=0x7fe9d0000950, 
    max_time=...)
    at ../../../../third_party/chromium/src/base/synchronization/waitable_event_posix.cc:216
#2  0x00007fea22ca7725 in base::WaitableEvent::Wait (this=this@entry=0x7fe9d0000950)
    at ../../../../third_party/chromium/src/base/synchronization/waitable_event_posix.cc:156
#3  0x00007fea22c88d5d in base::MessagePumpDefault::Run (this=0x7fe9d0000940, 
---Type <return> to continue, or q <return> to quit---
    delegate=0x561cc8904270)
    at ../../../../third_party/chromium/src/base/message_loop/message_pump_default.cc:53
#4  0x00007fea22c9b5a8 in base::RunLoop::Run (this=this@entry=0x7fe9df7fda10)
    at ../../../../third_party/chromium/src/base/run_loop.cc:35
#5  0x00007fea22c86245 in base::MessageLoop::Run (this=this@entry=0x561cc8904270)
    at ../../../../third_party/chromium/src/base/message_loop/message_loop.cc:293
#6  0x00007fea22cb3508 in base::Thread::Run (this=this@entry=0x561cc8893b60, 
    message_loop=message_loop@entry=0x561cc8904270)
    at ../../../../third_party/chromium/src/base/threading/thread.cc:202
#7  0x00007fea22d51c08 in content::BrowserThreadImpl::ProcessLauncherThreadRun (
    this=this@entry=0x561cc8893b60, message_loop=message_loop@entry=0x561cc8904270)
    at ../../../../third_party/chromium/src/content/browser/browser_thread_impl.cc:202
#8  0x00007fea22d5272d in content::BrowserThreadImpl::Run (this=0x561cc8893b60, 
    message_loop=0x561cc8904270)
    at ../../../../third_party/chromium/src/content/browser/browser_thread_impl.cc:247
#9  0x00007fea22cb3788 in base::Thread::ThreadMain (this=0x561cc8893b60)
    at ../../../../third_party/chromium/src/base/threading/thread.cc:254
#10 0x00007fea22cb049d in base::(anonymous namespace)::ThreadFunc (params=<optimized out>)
    at ../../../../third_party/chromium/src/base/threading/platform_thread_posix.cc:68
#11 0x00007fea571736fa in start_thread (arg=0x7fe9df7fe700) at pthread_create.c:333
#12 0x00007fea5748fb5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 19 (Thread 0x7fe9dffff700 (LWP 25282)):
#0  pthread_cond_wait@@GLIBC_2.3.2 ()
    at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007fea22ca765d in base::WaitableEvent::TimedWait (this=this@entry=0x7fe9d8000950, 
    max_time=...)
    at ../../../../third_party/chromium/src/base/synchronization/waitable_event_posix.cc:216
#2  0x00007fea22ca7725 in base::WaitableEvent::Wait (this=this@entry=0x7fe9d8000950)
    at ../../../../third_party/chromium/src/base/synchronization/waitable_event_posix.cc:156
#3  0x00007fea22c88d5d in base::MessagePumpDefault::Run (this=0x7fe9d8000940, 
    delegate=0x561cc89026f0)
    at ../../../../third_party/chromium/src/base/message_loop/message_pump_default.cc:53
#4  0x00007fea22c9b5a8 in base::RunLoop::Run (this=this@entry=0x7fe9dfffea10)
    at ../../../../third_party/chromium/src/base/run_loop.cc:35
#5  0x00007fea22c86245 in base::MessageLoop::Run (this=this@entry=0x561cc89026f0)
    at ../../../../third_party/chromium/src/base/message_loop/message_loop.cc:293
#6  0x00007fea22cb3508 in base::Thread::Run (this=this@entry=0x561cc88f8160, 
---Type <return> to continue, or q <return> to quit---
    message_loop=message_loop@entry=0x561cc89026f0)
    at ../../../../third_party/chromium/src/base/threading/thread.cc:202
#7  0x00007fea22d51b58 in content::BrowserThreadImpl::FileUserBlockingThreadRun (
    this=this@entry=0x561cc88f8160, message_loop=message_loop@entry=0x561cc89026f0)
    at ../../../../third_party/chromium/src/content/browser/browser_thread_impl.cc:195
#8  0x00007fea22d5271d in content::BrowserThreadImpl::Run (this=0x561cc88f8160, 
    message_loop=0x561cc89026f0)
    at ../../../../third_party/chromium/src/content/browser/browser_thread_impl.cc:245
#9  0x00007fea22cb3788 in base::Thread::ThreadMain (this=0x561cc88f8160)
    at ../../../../third_party/chromium/src/base/threading/thread.cc:254
#10 0x00007fea22cb049d in base::(anonymous namespace)::ThreadFunc (params=<optimized out>)
    at ../../../../third_party/chromium/src/base/threading/platform_thread_posix.cc:68
#11 0x00007fea571736fa in start_thread (arg=0x7fe9dffff700) at pthread_create.c:333
#12 0x00007fea5748fb5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 18 (Thread 0x7fea00ff9700 (LWP 25281)):
#0  0x00007fea57490153 in epoll_wait () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007fea2331c0dd in epoll_dispatch (base=0x7fe9e40013b0, arg=0x7fe9e40019e0, 
    tv=<optimized out>)
    at ../../../../third_party/chromium/src/base/third_party/libevent/epoll.c:198
#2  0x00007fea2331a2d0 in event_base_loop (base=0x7fe9e40013b0, flags=flags@entry=1)
    at ../../../../third_party/chromium/src/base/third_party/libevent/event.c:531
#3  0x00007fea22c5e3b9 in base::MessagePumpLibevent::Run (this=0x7fe9e4001340, 
    delegate=0x561cc88f7f20)
    at ../../../../third_party/chromium/src/base/message_loop/message_pump_libevent.cc:256
#4  0x00007fea22c9b5a8 in base::RunLoop::Run (this=this@entry=0x7fea00ff8a10)
    at ../../../../third_party/chromium/src/base/run_loop.cc:35
#5  0x00007fea22c86245 in base::MessageLoop::Run (this=this@entry=0x561cc88f7f20)
    at ../../../../third_party/chromium/src/base/message_loop/message_loop.cc:293
#6  0x00007fea22cb3508 in base::Thread::Run (this=this@entry=0x561cc88f8250, 
    message_loop=message_loop@entry=0x561cc88f7f20)
    at ../../../../third_party/chromium/src/base/threading/thread.cc:202
#7  0x00007fea22d51aa8 in content::BrowserThreadImpl::FileThreadRun (
    this=this@entry=0x561cc88f8250, message_loop=message_loop@entry=0x561cc88f7f20)
    at ../../../../third_party/chromium/src/content/browser/browser_thread_impl.cc:188
#8  0x00007fea22d5270d in content::BrowserThreadImpl::Run (this=0x561cc88f8250, 
    message_loop=0x561cc88f7f20)
    at ../../../../third_party/chromium/src/content/browser/browser_thread_impl.cc:243
---Type <return> to continue, or q <return> to quit---
#9  0x00007fea22cb3788 in base::Thread::ThreadMain (this=0x561cc88f8250)
    at ../../../../third_party/chromium/src/base/threading/thread.cc:254
#10 0x00007fea22cb049d in base::(anonymous namespace)::ThreadFunc (params=<optimized out>)
    at ../../../../third_party/chromium/src/base/threading/platform_thread_posix.cc:68
#11 0x00007fea571736fa in start_thread (arg=0x7fea00ff9700) at pthread_create.c:333
#12 0x00007fea5748fb5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 17 (Thread 0x7fea017fa700 (LWP 25280)):
#0  pthread_cond_wait@@GLIBC_2.3.2 ()
    at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007fea22ca765d in base::WaitableEvent::TimedWait (this=this@entry=0x7fe9e00012c0, 
    max_time=...)
    at ../../../../third_party/chromium/src/base/synchronization/waitable_event_posix.cc:216
#2  0x00007fea22ca7725 in base::WaitableEvent::Wait (this=this@entry=0x7fe9e00012c0)
    at ../../../../third_party/chromium/src/base/synchronization/waitable_event_posix.cc:156
#3  0x00007fea22c88d5d in base::MessagePumpDefault::Run (this=0x7fe9e00012b0, 
    delegate=0x561cc88db250)
    at ../../../../third_party/chromium/src/base/message_loop/message_pump_default.cc:53
#4  0x00007fea22c9b5a8 in base::RunLoop::Run (this=this@entry=0x7fea017f9a10)
    at ../../../../third_party/chromium/src/base/run_loop.cc:35
#5  0x00007fea22c86245 in base::MessageLoop::Run (this=this@entry=0x561cc88db250)
    at ../../../../third_party/chromium/src/base/message_loop/message_loop.cc:293
#6  0x00007fea22cb3508 in base::Thread::Run (this=this@entry=0x561cc88f86f0, 
    message_loop=message_loop@entry=0x561cc88db250)
    at ../../../../third_party/chromium/src/base/threading/thread.cc:202
#7  0x00007fea22d519f8 in content::BrowserThreadImpl::DBThreadRun (
    this=this@entry=0x561cc88f86f0, message_loop=message_loop@entry=0x561cc88db250)
    at ../../../../third_party/chromium/src/content/browser/browser_thread_impl.cc:181
#8  0x00007fea22d526ed in content::BrowserThreadImpl::Run (this=0x561cc88f86f0, 
    message_loop=0x561cc88db250)
    at ../../../../third_party/chromium/src/content/browser/browser_thread_impl.cc:241
#9  0x00007fea22cb3788 in base::Thread::ThreadMain (this=0x561cc88f86f0)
    at ../../../../third_party/chromium/src/base/threading/thread.cc:254
#10 0x00007fea22cb049d in base::(anonymous namespace)::ThreadFunc (params=<optimized out>)
    at ../../../../third_party/chromium/src/base/threading/platform_thread_posix.cc:68
#11 0x00007fea571736fa in start_thread (arg=0x7fea017fa700) at pthread_create.c:333
#12 0x00007fea5748fb5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

---Type <return> to continue, or q <return> to quit---
Thread 16 (Thread 0x7fea01ffb700 (LWP 25279)):
#0  pthread_cond_timedwait@@GLIBC_2.3.2 ()
    at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_timedwait.S:225
#1  0x00007fea22ca6e62 in base::ConditionVariable::TimedWait (this=this@entry=0x7fe9f0005238, 
    max_time=...)
    at ../../../../third_party/chromium/src/base/synchronization/condition_variable_posix.cc:117
#2  0x00007fea22cb5d00 in base::PosixDynamicThreadPool::WaitForTask (this=0x7fe9f00051e0)
    at ../../../../third_party/chromium/src/base/threading/worker_pool_posix.cc:180
#3  0x00007fea22cb6213 in base::(anonymous namespace)::WorkerThread::ThreadMain (
    this=0x7fe9f00057d0)
    at ../../../../third_party/chromium/src/base/threading/worker_pool_posix.cc:86
#4  0x00007fea22cb049d in base::(anonymous namespace)::ThreadFunc (params=<optimized out>)
    at ../../../../third_party/chromium/src/base/threading/platform_thread_posix.cc:68
#5  0x00007fea571736fa in start_thread (arg=0x7fea01ffb700) at pthread_create.c:333
#6  0x00007fea5748fb5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 15 (Thread 0x7fea027fc700 (LWP 25278)):
#0  pthread_cond_timedwait@@GLIBC_2.3.2 ()
    at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_timedwait.S:225
#1  0x00007fea22ca6e62 in base::ConditionVariable::TimedWait (this=this@entry=0x7fe9f0005238, 
    max_time=...)
    at ../../../../third_party/chromium/src/base/synchronization/condition_variable_posix.cc:117
#2  0x00007fea22cb5d00 in base::PosixDynamicThreadPool::WaitForTask (this=0x7fe9f00051e0)
    at ../../../../third_party/chromium/src/base/threading/worker_pool_posix.cc:180
#3  0x00007fea22cb6213 in base::(anonymous namespace)::WorkerThread::ThreadMain (
    this=0x7fe9f0005560)
    at ../../../../third_party/chromium/src/base/threading/worker_pool_posix.cc:86
#4  0x00007fea22cb049d in base::(anonymous namespace)::ThreadFunc (params=<optimized out>)
    at ../../../../third_party/chromium/src/base/threading/platform_thread_posix.cc:68
#5  0x00007fea571736fa in start_thread (arg=0x7fea027fc700) at pthread_create.c:333
#6  0x00007fea5748fb5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 14 (Thread 0x7fea02ffd700 (LWP 25277)):
#0  0x00007fea57485d13 in select () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007fea22c7321f in base::(anonymous namespace)::InotifyReaderCallback (
    reader=0x7fea2726d488 <base::(anonymous namespace)::g_inotify_reader+8>, inotify_fd=47, 
    shutdown_fd=48)
    at ../../../../third_party/chromium/src/base/files/file_path_watcher_linux.cc:215
---Type <return> to continue, or q <return> to quit---
#2  0x00007fea22c6a68d in base::Callback<void ()>::Run() const (this=0x7fea02ffcc88)
    at ../../../../third_party/chromium/src/base/callback.h:394
#3  base::debug::TaskAnnotator::RunTask (this=this@entry=0x7fe9f00043e8, 
    queue_function=queue_function@entry=0x7fea26260688 "MessageLoop::PostTask", 
    pending_task=...) at ../../../../third_party/chromium/src/base/debug/task_annotator.cc:51
#4  0x00007fea22c86a09 in base::MessageLoop::RunTask (this=this@entry=0x7fe9f0004270, 
    pending_task=...)
    at ../../../../third_party/chromium/src/base/message_loop/message_loop.cc:476
#5  0x00007fea22c8702d in base::MessageLoop::DeferOrRunPendingTask (
    this=this@entry=0x7fe9f0004270, pending_task=...)
    at ../../../../third_party/chromium/src/base/message_loop/message_loop.cc:485
#6  0x00007fea22c872f8 in base::MessageLoop::DoWork (this=0x7fe9f0004270)
    at ../../../../third_party/chromium/src/base/message_loop/message_loop.cc:597
#7  0x00007fea22c88d19 in base::MessagePumpDefault::Run (this=0x7fe9f40012b0, 
    delegate=0x7fe9f0004270)
    at ../../../../third_party/chromium/src/base/message_loop/message_pump_default.cc:33
#8  0x00007fea22c9b5a8 in base::RunLoop::Run (this=this@entry=0x7fea02ffce30)
    at ../../../../third_party/chromium/src/base/run_loop.cc:35
#9  0x00007fea22c86245 in base::MessageLoop::Run (this=<optimized out>)
    at ../../../../third_party/chromium/src/base/message_loop/message_loop.cc:293
#10 0x00007fea22cb370a in base::Thread::Run (message_loop=<optimized out>, 
    this=0x7fea2726d4e8 <base::(anonymous namespace)::g_inotify_reader+104>)
    at ../../../../third_party/chromium/src/base/threading/thread.cc:202
#11 base::Thread::ThreadMain (
    this=0x7fea2726d4e8 <base::(anonymous namespace)::g_inotify_reader+104>)
    at ../../../../third_party/chromium/src/base/threading/thread.cc:254
#12 0x00007fea22cb049d in base::(anonymous namespace)::ThreadFunc (params=<optimized out>)
    at ../../../../third_party/chromium/src/base/threading/platform_thread_posix.cc:68
#13 0x00007fea571736fa in start_thread (arg=0x7fea02ffd700) at pthread_create.c:333
#14 0x00007fea5748fb5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 13 (Thread 0x7fea037fe700 (LWP 25276)):
#0  0x00007fea57490153 in epoll_wait () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007fea2331c0dd in epoll_dispatch (base=0x7fe9f00013b0, arg=0x7fe9f00019e0, 
    tv=<optimized out>)
    at ../../../../third_party/chromium/src/base/third_party/libevent/epoll.c:198
#2  0x00007fea2331a2d0 in event_base_loop (base=0x7fe9f00013b0, flags=flags@entry=1)
    at ../../../../third_party/chromium/src/base/third_party/libevent/event.c:531
---Type <return> to continue, or q <return> to quit---
#3  0x00007fea22c5e3b9 in base::MessagePumpLibevent::Run (this=0x7fe9f0001340, 
    delegate=0x561cc8787da0)
    at ../../../../third_party/chromium/src/base/message_loop/message_pump_libevent.cc:256
#4  0x00007fea22c9b5a8 in base::RunLoop::Run (this=this@entry=0x7fea037fde30)
    at ../../../../third_party/chromium/src/base/run_loop.cc:35
#5  0x00007fea22c86245 in base::MessageLoop::Run (this=<optimized out>)
    at ../../../../third_party/chromium/src/base/message_loop/message_loop.cc:293
#6  0x00007fea22cb370a in base::Thread::Run (message_loop=<optimized out>, this=0x561cc8787940)
    at ../../../../third_party/chromium/src/base/threading/thread.cc:202
#7  base::Thread::ThreadMain (this=0x561cc8787940)
    at ../../../../third_party/chromium/src/base/threading/thread.cc:254
#8  0x00007fea22cb049d in base::(anonymous namespace)::ThreadFunc (params=<optimized out>)
    at ../../../../third_party/chromium/src/base/threading/platform_thread_posix.cc:68
#9  0x00007fea571736fa in start_thread (arg=0x7fea037fe700) at pthread_create.c:333
#10 0x00007fea5748fb5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 12 (Thread 0x7fea03fff700 (LWP 25275)):
#0  0x00007fea5745469b in __GI___waitpid (pid=25271, stat_loc=stat_loc@entry=0x0, 
    options=options@entry=0) at ../sysdeps/unix/sysv/linux/waitpid.c:29
#1  0x00007fea22c96e86 in base::(anonymous namespace)::BackgroundReaper::WaitForChildToDie (
    this=0x561cc86f16d0) at ../../../../third_party/chromium/src/base/process/kill_posix.cc:170
#2  base::(anonymous namespace)::BackgroundReaper::ThreadMain (this=0x561cc86f16d0)
    at ../../../../third_party/chromium/src/base/process/kill_posix.cc:163
#3  0x00007fea22cb049d in base::(anonymous namespace)::ThreadFunc (params=<optimized out>)
    at ../../../../third_party/chromium/src/base/threading/platform_thread_posix.cc:68
#4  0x00007fea571736fa in start_thread (arg=0x7fea03fff700) at pthread_create.c:333
#5  0x00007fea5748fb5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 11 (Thread 0x7fea0d7b1700 (LWP 25270)):
#0  0x00007fea57483e8d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007fea22f2f57a in poll (__timeout=-1, __nfds=2, __fds=0x7fea0d7b0c60)
    at /usr/include/x86_64-linux-gnu/bits/poll2.h:46
#2  content::SandboxIPCHandler::Run (this=0x561cc86f13b0)
    at ../../../../third_party/chromium/src/content/browser/renderer_host/sandbox_ipc_linux.cc:92
#3  0x00007fea22cb31ae in base::DelegateSimpleThread::Run (this=0x561cc86ef280)
    at ../../../../third_party/chromium/src/base/threading/simple_thread.cc:87
#4  0x00007fea22cb32d0 in base::SimpleThread::ThreadMain (this=0x561cc86ef280)
---Type <return> to continue, or q <return> to quit---
    at ../../../../third_party/chromium/src/base/threading/simple_thread.cc:66
#5  0x00007fea22cb049d in base::(anonymous namespace)::ThreadFunc (params=<optimized out>)
    at ../../../../third_party/chromium/src/base/threading/platform_thread_posix.cc:68
#6  0x00007fea571736fa in start_thread (arg=0x7fea0d7b1700) at pthread_create.c:333
#7  0x00007fea5748fb5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 10 (Thread 0x7fea0ffff700 (LWP 25265)):
#0  0x00007fea57483e8d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007fea56c5231c in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fea56c5242c in g_main_context_iteration ()
   from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fea582cfa7f in QEventDispatcherGlib::processEvents (this=0x7fea040008c0, flags=...)
    at kernel/qeventdispatcher_glib.cpp:418
#4  0x00007fea58276dea in QEventLoop::exec (this=this@entry=0x7fea0fffedd0, flags=..., 
    flags@entry=...) at kernel/qeventloop.cpp:204
#5  0x00007fea580938a4 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:503
#6  0x00007fea5935eed6 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#7  0x00007fea5809884e in QThreadPrivate::start (arg=0x561cc80af8f0)
    at thread/qthread_unix.cpp:331
#8  0x00007fea571736fa in start_thread (arg=0x7fea0ffff700) at pthread_create.c:333
#9  0x00007fea5748fb5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 9 (Thread 0x7fea15b8b700 (LWP 25264)):
#0  0x00007fea574548dd in nanosleep () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007fea5745482a in __sleep (seconds=0) at ../sysdeps/posix/sleep.c:55
#2  0x00007fea1d5b2aad in ?? () from /usr/lib/x86_64-linux-gnu/liblttng-ust.so.0
#3  0x00007fea571736fa in start_thread (arg=0x7fea15b8b700) at pthread_create.c:333
#4  0x00007fea5748fb5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 8 (Thread 0x7fea1638c700 (LWP 25263)):
#0  0x00007fea574548dd in nanosleep () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007fea5745482a in __sleep (seconds=0) at ../sysdeps/posix/sleep.c:55
#2  0x00007fea1d5b2aad in ?? () from /usr/lib/x86_64-linux-gnu/liblttng-ust.so.0
#3  0x00007fea571736fa in start_thread (arg=0x7fea1638c700) at pthread_create.c:333
#4  0x00007fea5748fb5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 6 (Thread 0x7fea2cb7b700 (LWP 25252)):

#0  0x00007fea57483e8d in poll () at ../sysdeps/unix/syscall-template.S:84
---Type <return> to continue, or q <return> to quit---
#1  0x00007fea56c5231c in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fea56c5242c in g_main_context_iteration ()
   from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fea582cfa7f in QEventDispatcherGlib::processEvents (this=0x7fea280008c0, flags=...)
    at kernel/qeventdispatcher_glib.cpp:418
#4  0x00007fea58276dea in QEventLoop::exec (this=this@entry=0x7fea2cb7ae20, flags=..., 
    flags@entry=...) at kernel/qeventloop.cpp:204
#5  0x00007fea580938a4 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:503
#6  0x00007fea591133c5 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#7  0x00007fea5809884e in QThreadPrivate::start (arg=0x561cc7bf0130)
    at thread/qthread_unix.cpp:331
#8  0x00007fea571736fa in start_thread (arg=0x7fea2cb7b700) at pthread_create.c:333
#9  0x00007fea5748fb5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 5 (Thread 0x7fea41e68700 (LWP 25251)):
#0  0x00007fea57483e8d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007fea56c5231c in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fea56c526a2 in g_main_loop_run () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fea468f0906 in ?? () from /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0
#4  0x00007fea56c78b45 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007fea571736fa in start_thread (arg=0x7fea41e68700) at pthread_create.c:333
#6  0x00007fea5748fb5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 4 (Thread 0x7fea42669700 (LWP 25250)):
#0  0x00007fea57483e8d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007fea56c5231c in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0

#2  0x00007fea56c5242c in g_main_context_iteration ()
   from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fea56c52469 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007fea56c78b45 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007fea571736fa in start_thread (arg=0x7fea42669700) at pthread_create.c:333
#6  0x00007fea5748fb5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 3 (Thread 0x7fea42e6a700 (LWP 25249)):
#0  0x00007fea57483e8d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007fea56c5231c in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fea56c5242c in g_main_context_iteration ()
   from /lib/x86_64-linux-gnu/libglib-2.0.so.0
---Type <return> to continue, or q <return> to quit---
#3  0x00007fea42e7228d in ?? () from /usr/lib/x86_64-linux-gnu/gio/modules/libdconfsettings.so
#4  0x00007fea56c78b45 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007fea571736fa in start_thread (arg=0x7fea42e6a700) at pthread_create.c:333
#6  0x00007fea5748fb5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 2 (Thread 0x7fea4d0b7700 (LWP 25248)):
#0  0x00007fea57483e8d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007fea54695c62 in ?? () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#2  0x00007fea546978d7 in xcb_wait_for_event () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#3  0x00007fea50294629 in QXcbEventReader::run (this=0x561cc78f1f90) at qxcbconnection.cpp:1253
#4  0x00007fea5809884e in QThreadPrivate::start (arg=0x561cc78f1f90)
    at thread/qthread_unix.cpp:331
#5  0x00007fea571736fa in start_thread (arg=0x7fea4d0b7700) at pthread_create.c:333
#6  0x00007fea5748fb5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 1 (Thread 0x7fea59ceb780 (LWP 25244)):
#0  0x00007fea573be418 in __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:54
#1  0x00007fea573c001a in __GI_abort () at abort.c:89
#2  0x00007fea573b6bd7 in __assert_fail_base (fmt=<optimized out>, 
    assertion=assertion@entry=0x7fea406ff749 "kref", 
    file=file@entry=0x7fea406ff72a "../../nouveau/pushbuf.c", line=line@entry=727, 
    function=function@entry=0x7fea406ff770 "nouveau_pushbuf_data") at assert.c:92
#3  0x00007fea573b6c82 in __GI___assert_fail (assertion=0x7fea406ff749 "kref", 
    file=0x7fea406ff72a "../../nouveau/pushbuf.c", line=727, 
    function=0x7fea406ff770 "nouveau_pushbuf_data") at assert.c:101
#4  0x00007fea406fdb04 in nouveau_pushbuf_data ()
   from /usr/lib/x86_64-linux-gnu/libdrm_nouveau.so.2
#5  0x00007fea406fda4b in nouveau_pushbuf_data ()
   from /usr/lib/x86_64-linux-gnu/libdrm_nouveau.so.2
#6  0x00007fea406fdb99 in ?? () from /usr/lib/x86_64-linux-gnu/libdrm_nouveau.so.2
#7  0x00007fea406fde3f in ?? () from /usr/lib/x86_64-linux-gnu/libdrm_nouveau.so.2
#8  0x00007fea406fe827 in ?? () from /usr/lib/x86_64-linux-gnu/libdrm_nouveau.so.2
#9  0x00007fea40e1f3eb in ?? () from /usr/lib/x86_64-linux-gnu/dri/nouveau_dri.so
#10 0x00007fea40e2d6ce in ?? () from /usr/lib/x86_64-linux-gnu/dri/nouveau_dri.so
#11 0x00007fea40b39e77 in ?? () from /usr/lib/x86_64-linux-gnu/dri/nouveau_dri.so
#12 0x00007fea40b00ec8 in ?? () from /usr/lib/x86_64-linux-gnu/dri/nouveau_dri.so
#13 0x00007fea40b01349 in ?? () from /usr/lib/x86_64-linux-gnu/dri/nouveau_dri.so
#14 0x00007fea5938ecef in QSGBatchRenderer::Renderer::renderMergedBatch(QSGBatchRenderer::Batch c---Type <return> to continue, or q <return> to quit---
onst*) () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#15 0x00007fea5938f675 in QSGBatchRenderer::Renderer::renderBatches() ()
   from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#16 0x00007fea59394e82 in QSGBatchRenderer::Renderer::render() ()
   from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#17 0x00007fea593a0b6f in QSGRenderer::renderScene(QSGBindable const&) ()
   from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#18 0x00007fea593a13bb in QSGRenderer::renderScene(unsigned int) ()
   from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#19 0x00007fea593b187e in QSGRenderContext::renderNextFrame(QSGRenderer*, unsigned int) ()
   from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#20 0x00007fea593fc0db in QQuickWindowPrivate::renderSceneGraph(QSize const&) ()
   from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#21 0x00007fea593cc19b in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#22 0x00007fea593cd2a1 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#23 0x00007fea5979105c in QApplicationPrivate::notify_helper (this=this@entry=0x561cc78d0ab0, 
    receiver=receiver@entry=0x561cc7c93750, e=e@entry=0x7ffdd3c8a2a0)
    at kernel/qapplication.cpp:3716
#24 0x00007fea59796516 in QApplication::notify (this=0x7ffdd3c8a590, receiver=0x561cc7c93750, 
    e=0x7ffdd3c8a2a0) at kernel/qapplication.cpp:3499
#25 0x00007fea5827962b in QCoreApplication::notifyInternal (this=0x7ffdd3c8a590, 
    receiver=0x561cc7c93750, event=event@entry=0x7ffdd3c8a2a0)
    at kernel/qcoreapplication.cpp:965
#26 0x00007fea582ce89d in QCoreApplication::sendEvent (event=0x7ffdd3c8a2a0, 
    receiver=<optimized out>)
    at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:224
#27 QTimerInfoList::activateTimers (this=0x561cc79e0990) at kernel/qtimerinfo_unix.cpp:637
#28 0x00007fea582ceda1 in timerSourceDispatch (source=<optimized out>)
    at kernel/qeventdispatcher_glib.cpp:177
#29 0x00007fea56c52127 in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#30 0x00007fea56c52380 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#31 0x00007fea56c5242c in g_main_context_iteration ()
   from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#32 0x00007fea582cfa7f in QEventDispatcherGlib::processEvents (this=0x561cc79b2d90, flags=...)
    at kernel/qeventdispatcher_glib.cpp:418
#33 0x00007fea58276dea in QEventLoop::exec (this=this@entry=0x7ffdd3c8a4e0, flags=..., 
    flags@entry=...) at kernel/qeventloop.cpp:204
#34 0x00007fea5827ee8c in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1229
---Type <return> to continue, or q <return> to quit---
#35 0x00007fea589dbc3c in QGuiApplication::exec () at kernel/qguiapplication.cpp:1542
#36 0x00007fea5978d495 in QApplication::exec () at kernel/qapplication.cpp:2976
#37 0x0000561cc5a08e26 in BrowserApplication::run (this=0x7ffdd3c8a590)
    at /build/webbrowser-app-4Hx99o/webbrowser-app-0.23+16.04.20160413/src/app/browserapplication.cpp:263
#38 0x0000561cc59fda85 in main (argc=1, argv=0x7ffdd3c8a6e8)
    at /build/webbrowser-app-4Hx99o/webbrowser-app-0.23+16.04.20160413/src/app/webbrowser/webbrowser-app.cpp:122
(gdb)