.
Thread 4 (LWP 2191):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
No locals.
#1  0x00007f242ba144fb in cnd_wait (mtx=0x2ce30e8, cond=0x2ce3110) at ../../../../../../../include/c11/threads_posix.h:154
No locals.
#2  pipe_semaphore_wait (sema=0x2ce30e8) at ../../../../../../../src/gallium/auxiliary/os/os_thread.h:248
No locals.
#3  radeon_drm_cs_emit_ioctl (param=param@entry=0x2ce2dd0) at ../../../../../../../src/gallium/winsys/radeon/drm/radeon_drm_winsys.c:594
        ws = 0x2ce2dd0
        cs = <optimized out>
        i = <optimized out>
#4  0x00007f242ba13c87 in impl_thrd_routine (p=<optimized out>) at ../../../../../../../include/c11/threads_posix.h:87
        pack = {func = 0x7f242ba143c0 <radeon_drm_cs_emit_ioctl>, arg = 0x2ce2dd0}
#5  0x00007f24473ca6aa in start_thread (arg=0x7f242923b700) at pthread_create.c:333
        __res = <optimized out>
        pd = 0x7f242923b700
        now = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {139793285756672, -8654934862367742082, 0, 140724149818479, 139793285757376, 139793328055411, 8767150433399285630, 8767365946528966526}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
        not_first_call = <optimized out>
        pagesize_m1 = <optimized out>
        sp = <optimized out>
        freesize = <optimized out>
        __PRETTY_FUNCTION__ = "start_thread"
#6  0x00007f24476e7eed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109
No locals.
.
Thread 3 (LWP 2189):
#0  0x00007f24476dc8dd in poll () at ../sysdeps/unix/syscall-template.S:81
No locals.
#1  0x00007f2445a83b72 in poll (__timeout=-1, __nfds=1, __fds=0x7f243a1a1d00) at /usr/include/x86_64-linux-gnu/bits/poll2.h:46
No locals.
#2  _xcb_conn_wait (c=c@entry=0x2a3b670, cond=cond@entry=0x2a3b6b0, vector=vector@entry=0x0, count=count@entry=0x0) at ../../src/xcb_conn.c:447
        ret = <optimized out>
        fd = {fd = 3, events = 1, revents = 0}
#3  0x00007f2445a8564f in xcb_wait_for_event (c=0x2a3b670) at ../../src/xcb_in.c:622
        ret = 0x0
#4  0x00007f243c6ed099 in QXcbEventReader::run (this=0x2a49b70) at qxcbconnection.cpp:1105
        event = <optimized out>
#5  0x00007f2448065b0e in QThreadPrivate::start (arg=0x2a49b70) at thread/qthread_unix.cpp:337
        __clframe = {__cancel_routine = 0x7f2448064c00 <QThreadPrivate::finish(void*)>, __cancel_arg = 0x2a49b70, __do_it = 1, __cancel_type = <optimized out>}
        thr = 0x2a49b70
        data = 0x2a49ed0
        objectName = {static null = {<No data fields>}, d = 0x7f244837af20 <QArrayData::shared_null>}
#6  0x00007f24473ca6aa in start_thread (arg=0x7f243a1a2700) at pthread_create.c:333
        __res = <optimized out>
        pd = 0x7f243a1a2700
        now = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {139793570342656, -8654934862367742082, 0, 140724149820639, 139793570343360, 44342848, 8767112837939931006, 8767365946528966526}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
        not_first_call = <optimized out>
        pagesize_m1 = <optimized out>
        sp = <optimized out>
        freesize = <optimized out>
        __PRETTY_FUNCTION__ = "start_thread"
#7  0x00007f24476e7eed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109
No locals.
.
Thread 2 (LWP 2190):
#0  0x00007f24476dc8dd in poll () at ../sysdeps/unix/syscall-template.S:81
No locals.
#1  0x00007f2446eabebc in g_main_context_poll (priority=2147483647, n_fds=1, fds=0x7f242c003070, timeout=-1, context=0x7f242c000990) at /build/buildd/glib2.0-2.44.0/./glib/gmain.c:4103
        poll_func = 0x7f2446ebb3e0 <g_poll>
#2  g_main_context_iterate (context=context@entry=0x7f242c000990, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at /build/buildd/glib2.0-2.44.0/./glib/gmain.c:3803
        max_priority = 2147483647
        timeout = -1
        some_ready = <optimized out>
        nfds = 1
        allocated_nfds = 1
        fds = 0x7f242c003070
#3  0x00007f2446eabfcc in g_main_context_iteration (context=0x7f242c000990, may_block=1) at /build/buildd/glib2.0-2.44.0/./glib/gmain.c:3869
        retval = <optimized out>
#4  0x00007f24482fcc57 in QEventDispatcherGlib::processEvents (this=0x7f242c0008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:418
        d = 0x7f242c0008e0
        canWait = true
        savedFlags = {i = 0}
        result = <optimized out>
#5  0x00007f24482a13e2 in QEventLoop::exec (this=this@entry=0x7f2439087e00, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
        locker = {val = 44735232}
        ref = {d = 0x7f242c002f90, locker = @0x7f2439087d80, exceptionCaught = true}
        d = 0x7f242c002f90
#6  0x00007f2448060b44 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:503
        d = 0x2aa9a90
        locker = {val = 44735232}
        eventLoop = {<QObject> = {_vptr.QObject = 0x7f24484fe110 <vtable for QEventLoop+16>, static staticMetaObject = {d = {superdata = 0x0, stringdata = 0x7f2448425a00 <qt_meta_stringdata_QObject>, data = 0x7f24484258c0 <qt_meta_data_QObject>, static_metacall = 0x7f24482ddd00 <QObject::qt_static_metacall(QObject*, QMetaObject::Call, int, void**)>, relatedMetaObjects = 0x0, extradata = 0x0}}, d_ptr = {d = 0x7f242c002f90}, static staticQtMetaObject = {d = {superdata = 0x0, stringdata = 0x7f244846d500 <qt_meta_stringdata_Qt>, data = 0x7f244846ac80 <qt_meta_data_Qt>, static_metacall = 0x0, relatedMetaObjects = 0x0, extradata = 0x0}}}, static staticMetaObject = {d = {superdata = 0x7f24484f6940 <QObject::staticMetaObject>, stringdata = 0x7f24484814c0 <qt_meta_stringdata_QEventLoop>, data = 0x7f2448481440 <qt_meta_data_QEventLoop>, static_metacall = 0x7f2448353e50 <QEventLoop::qt_static_metacall(QObject*, QMetaObject::Call, int, void**)>, relatedMetaObjects = 0x0, extradata = 0x0}}}
        returnCode = <optimized out>
#7  0x00007f2448065b0e in QThreadPrivate::start (arg=0x2a9d8a0) at thread/qthread_unix.cpp:337
        __clframe = {__cancel_routine = 0x7f2448064c00 <QThreadPrivate::finish(void*)>, __cancel_arg = 0x2a9d8a0, __do_it = 1, __cancel_type = <optimized out>}
        thr = 0x2a9d8a0
        data = 0x2aaa030
        objectName = {static null = {<No data fields>}, d = 0x7f244d82bdc0 <QNetworkConfigurationManagerPrivate::initialize()::{lambda()#1}::operator()() const::qstring_literal>}
#8  0x00007f24473ca6aa in start_thread (arg=0x7f2439088700) at pthread_create.c:333
        __res = <optimized out>
        pd = 0x7f2439088700
        now = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {139793552410368, -8654934862367742082, 0, 140724149821055, 139793552411072, 44735264, 8767114885565589374, 8767365946528966526}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
        not_first_call = <optimized out>
        pagesize_m1 = <optimized out>
        sp = <optimized out>
        freesize = <optimized out>
        __PRETTY_FUNCTION__ = "start_thread"
#9  0x00007f24476e7eed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109
No locals.
.
Thread 1 (LWP 2188):
#0  ref (this=<optimized out>) at ../../include/QtCore/../../src/corelib/arch/qatomic_x86_64.h:121
No locals.
#1  QList (this=0x7f242525d818 <QPrinterInfoPrivate::shared_null+24>) at ../../include/QtCore/../../src/corelib/tools/qlist.h:121
No locals.
#2  QPrinterInfoPrivate (name=..., this=0x7f242525d800 <QPrinterInfoPrivate::shared_null>) at painting/qprinterinfo_p.h:71
No locals.
#3  __static_initialization_and_destruction_0 (__initialize_p=1, __priority=65535) at painting/qprinterinfo.cpp:35
No locals.
#4  _GLOBAL__sub_I_qprinterinfo.cpp(void) () at painting/qprinterinfo.cpp:163
No locals.
#5  0x00007f244d6815ba in ?? ()
No symbol table info available.
#6  0x0000000000000002 in ?? ()
No symbol table info available.
#7  0x0000000000000003 in ?? ()
No symbol table info available.
#8  0x00007ffce4f62588 in ?? ()
No symbol table info available.
#9  0x0000000002ab35b0 in ?? ()
No symbol table info available.
#10 0x0000000003589840 in ?? ()
No symbol table info available.
#11 0x00007f244d6816cb in ?? ()
No symbol table info available.
#12 0x0000000002a333c0 in ?? ()
No symbol table info available.
#13 0x0000000000000000 in ?? ()
No symbol table info available.