.
Thread 10 (Thread 0x7f305ebfb700 (LWP 23712)):
#0  0x00007f30d0d490cd in poll () at ../sysdeps/unix/syscall-template.S:81
No locals.
#1  0x00007f30ca3d7ebc in g_main_context_poll (priority=2147483647, n_fds=1, fds=0x7f304c001690, timeout=-1, context=0x7f304c0009b0) at /build/buildd/glib2.0-2.43.90/./glib/gmain.c:4103
        poll_func = 0x7f30ca3e73e0 <g_poll>
#2  g_main_context_iterate (context=context@entry=0x7f304c0009b0, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at /build/buildd/glib2.0-2.43.90/./glib/gmain.c:3803
        max_priority = 2147483647
        timeout = -1
        some_ready = <optimized out>
        nfds = 1
        allocated_nfds = 1
        fds = 0x7f304c001690
#3  0x00007f30ca3d7fcc in g_main_context_iteration (context=0x7f304c0009b0, may_block=1) at /build/buildd/glib2.0-2.43.90/./glib/gmain.c:3869
        retval = <optimized out>
#4  0x00007f30c89f3ab7 in QEventDispatcherGlib::processEvents (this=0x7f304c0008e0, flags=...) at kernel/qeventdispatcher_glib.cpp:418
        d = 0x7f304c000900
        canWait = true
        savedFlags = {i = 0}
        result = <optimized out>
#5  0x00007f30c8998392 in QEventLoop::exec (this=this@entry=0x7f305ebfae80, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
        locker = {val = 67938464}
        ref = {d = 0x7f304c0015b0, locker = @0x7f305ebfae00, exceptionCaught = true}
        d = 0x7f304c0015b0
#6  0x00007f30c8757a94 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:503
        d = 0x40ca830
        locker = {val = 67938464}
        eventLoop = {<QObject> = {_vptr.QObject = 0x7f30c8bf5110 <vtable for QEventLoop+16>, static staticMetaObject = {d = {superdata = 0x0, stringdata = 0x7f30c8b1c7c0 <qt_meta_stringdata_QObject>, data = 0x7f30c8b1c680 <qt_meta_data_QObject>, static_metacall = 0x7f30c89d4c90 <QObject::qt_static_metacall(QObject*, QMetaObject::Call, int, void**)>, relatedMetaObjects = 0x0, extradata = 0x0}}, d_ptr = {d = 0x7f304c0015b0}, static staticQtMetaObject = {d = {superdata = 0x0, stringdata = 0x7f30c8b642c0 <qt_meta_stringdata_Qt>, data = 0x7f30c8b61a40 <qt_meta_data_Qt>, static_metacall = 0x0, relatedMetaObjects = 0x0, extradata = 0x0}}}, static staticMetaObject = {d = {superdata = 0x7f30c8bed940 <QObject::staticMetaObject>, stringdata = 0x7f30c8b78280 <qt_meta_stringdata_QEventLoop>, data = 0x7f30c8b78200 <qt_meta_data_QEventLoop>, static_metacall = 0x7f30c8a4acc0 <QEventLoop::qt_static_metacall(QObject*, QMetaObject::Call, int, void**)>, relatedMetaObjects = 0x0, extradata = 0x0}}}
        returnCode = <optimized out>
#7  0x00007f30c875ca4e in QThreadPrivate::start (arg=0x40ca810) at thread/qthread_unix.cpp:337
        __clframe = {__cancel_routine = 0x7f30c875bb40 <QThreadPrivate::finish(void*)>, __cancel_arg = 0x40ca810, __do_it = 1, __cancel_type = <optimized out>}
        thr = 0x40ca810
        data = 0x40ca950
        objectName = {static null = {<No data fields>}, d = 0x7f30c4328ac0 <QNetworkConfigurationManagerPrivate::initialize()::{lambda()#1}::operator()() const::qstring_literal>}
#8  0x00007f30d10260a5 in start_thread (arg=0x7f305ebfb700) at pthread_create.c:309
        __res = <optimized out>
        pd = 0x7f305ebfb700
        now = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {139845724780288, -8058639983730711765, 0, 0, 139845724780992, 139845724780288, 7946963139058770731, 7946697910222234411}, 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  0x00007f30d0d5357d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111
No locals.
.
Thread 9 (Thread 0x7f305f7fc700 (LWP 23711)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
No locals.
#1  0x00007f30c33e46a3 in JSC::GCThread::gcThreadMain (this=0x4082e50) at heap/GCThread.cpp:81
No locals.
#2  0x00007f30c371eeb1 in WTF::wtfThreadEntryPoint(void*) () at wtf/ThreadingPthreads.cpp:195
No locals.
#3  0x00007f30d10260a5 in start_thread (arg=0x7f305f7fc700) at pthread_create.c:309
        __res = <optimized out>
        pd = 0x7f305f7fc700
        now = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {139845737367296, -8058639983730711765, 0, 0, 139845737368000, 139845737367296, 7946965888374711083, 7946697910222234411}, 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"
#4  0x00007f30d0d5357d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111
No locals.
.
Thread 8 (Thread 0x7f305fffd700 (LWP 23710)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
No locals.
#1  0x00007f30c33e46a3 in JSC::GCThread::gcThreadMain (this=0x4082d30) at heap/GCThread.cpp:81
No locals.
#2  0x00007f30c371eeb1 in WTF::wtfThreadEntryPoint(void*) () at wtf/ThreadingPthreads.cpp:195
No locals.
#3  0x00007f30d10260a5 in start_thread (arg=0x7f305fffd700) at pthread_create.c:309
        __res = <optimized out>
        pd = 0x7f305fffd700
        now = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {139845745760000, -8058639983730711765, 0, 0, 139845745760704, 139845745760000, 7946964785104986923, 7946697910222234411}, 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"
#4  0x00007f30d0d5357d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111
No locals.
.
Thread 7 (Thread 0x7f30a4ba0700 (LWP 23709)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
No locals.
#1  0x00007f30c33e46a3 in JSC::GCThread::gcThreadMain (this=0x4082d90) at heap/GCThread.cpp:81
No locals.
#2  0x00007f30c371eeb1 in WTF::wtfThreadEntryPoint(void*) () at wtf/ThreadingPthreads.cpp:195
No locals.
#3  0x00007f30d10260a5 in start_thread (arg=0x7f30a4ba0700) at pthread_create.c:309
        __res = <optimized out>
        pd = 0x7f30a4ba0700
        now = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {139846898812672, -8058639983730711765, 0, 0, 139846898813376, 139846898812672, 7946809154280661803, 7946697910222234411}, 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"
#4  0x00007f30d0d5357d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111
No locals.
.
Thread 6 (Thread 0x7f30a6a98700 (LWP 23706)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
No locals.
#1  0x00007f30c36edfb0 in WTF::TCMalloc_PageHeap::scavengerThread (this=0x7f30c3fc491c <WTF::pageheap_memory+57564>) at wtf/FastMalloc.cpp:2825
        targetPageCount = 3288033344
#2  0x00007f30c36edfd9 in WTF::TCMalloc_PageHeap::runScavengerThread (context=0x7f30c3fc491c <WTF::pageheap_memory+57564>) at wtf/FastMalloc.cpp:1993
No locals.
#3  0x00007f30d10260a5 in start_thread (arg=0x7f30a6a98700) at pthread_create.c:309
        __res = <optimized out>
        pd = 0x7f30a6a98700
        now = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {139846931285760, -8058639983730711765, 0, 0, 139846931286464, 139846931285760, 7946804897968071467, 7946697910222234411}, 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"
#4  0x00007f30d0d5357d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111
No locals.
.
Thread 5 (Thread 0x7f30a53c0700 (LWP 23708)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
No locals.
#1  0x00007f30c33e368d in JSC::BlockAllocator::blockFreeingThreadMain (this=0x7f30a61f8058) at heap/BlockAllocator.cpp:139
        region = 0x0
#2  0x00007f30c371eeb1 in WTF::wtfThreadEntryPoint(void*) () at wtf/ThreadingPthreads.cpp:195
No locals.
#3  0x00007f30d10260a5 in start_thread (arg=0x7f30a53c0700) at pthread_create.c:309
        __res = <optimized out>
        pd = 0x7f30a53c0700
        now = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {139846907332352, -8058639983730711765, 0, 0, 139846907333056, 139846907332352, 7946812469995414315, 7946697910222234411}, 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"
#4  0x00007f30d0d5357d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111
No locals.
.
Thread 4 (Thread 0x7f30ad002700 (LWP 23705)):
#0  0x00007f30d0d490cd in poll () at ../sysdeps/unix/syscall-template.S:81
No locals.
#1  0x00007f30ca3d7ebc in g_main_context_poll (priority=2147483647, n_fds=2, fds=0x7f30a00010c0, timeout=-1, context=0x7f30a80106c0) at /build/buildd/glib2.0-2.43.90/./glib/gmain.c:4103
        poll_func = 0x7f30ca3e73e0 <g_poll>
#2  g_main_context_iterate (context=0x7f30a80106c0, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at /build/buildd/glib2.0-2.43.90/./glib/gmain.c:3803
        max_priority = 2147483647
        timeout = -1
        some_ready = <optimized out>
        nfds = 2
        allocated_nfds = 2
        fds = 0x7f30a00010c0
#3  0x00007f30ca3d8242 in g_main_loop_run (loop=0x7f30a8010650) at /build/buildd/glib2.0-2.43.90/./glib/gmain.c:4002
        __FUNCTION__ = "g_main_loop_run"
#4  0x00007f30ca0eef06 in gdbus_shared_thread_func (user_data=0x7f30a8010690) at /build/buildd/glib2.0-2.43.90/./gio/gdbusprivate.c:274
        data = 0x7f30a8010690
#5  0x00007f30ca3fe955 in g_thread_proxy (data=0x7f30a8013450) at /build/buildd/glib2.0-2.43.90/./glib/gthread.c:764
        thread = 0x7f30a8013450
#6  0x00007f30d10260a5 in start_thread (arg=0x7f30ad002700) at pthread_create.c:309
        __res = <optimized out>
        pd = 0x7f30ad002700
        now = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {139847037626112, -8058639983730711765, 0, 0, 139847037626816, 139847037626112, 7946794651249845035, 7946697910222234411}, 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  0x00007f30d0d5357d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111
No locals.
.
Thread 3 (Thread 0x7f30ad803700 (LWP 23704)):
#0  0x00007f30d0d490cd in poll () at ../sysdeps/unix/syscall-template.S:81
No locals.
#1  0x00007f30ca3d7ebc in g_main_context_poll (priority=2147483647, n_fds=1, fds=0x7f30a80010c0, timeout=-1, context=0x3625000) at /build/buildd/glib2.0-2.43.90/./glib/gmain.c:4103
        poll_func = 0x7f30ca3e73e0 <g_poll>
#2  g_main_context_iterate (context=context@entry=0x3625000, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at /build/buildd/glib2.0-2.43.90/./glib/gmain.c:3803
        max_priority = 2147483647
        timeout = -1
        some_ready = <optimized out>
        nfds = 1
        allocated_nfds = 1
        fds = 0x7f30a80010c0
#3  0x00007f30ca3d7fcc in g_main_context_iteration (context=context@entry=0x3625000, may_block=may_block@entry=1) at /build/buildd/glib2.0-2.43.90/./glib/gmain.c:3869
        retval = <optimized out>
#4  0x00007f30ad80b27d in dconf_gdbus_worker_thread (user_data=0x3625000) at dconf-gdbus-thread.c:82
        context = 0x3625000
#5  0x00007f30ca3fe955 in g_thread_proxy (data=0x35d5590) at /build/buildd/glib2.0-2.43.90/./glib/gthread.c:764
        thread = 0x35d5590
#6  0x00007f30d10260a5 in start_thread (arg=0x7f30ad803700) at pthread_create.c:309
        __res = <optimized out>
        pd = 0x7f30ad803700
        now = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {139847046018816, -8058639983730711765, 0, 0, 139847046019520, 139847046018816, 7946793552275088171, 7946697910222234411}, 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  0x00007f30d0d5357d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111
No locals.
.
Thread 2 (Thread 0x7f30d1439740 (LWP 23698)):
#0  0x00007f30d124c3e0 in ?? () from /tmp/apport_sandbox_kekJFq/lib64/ld-linux-x86-64.so.2
No symbol table info available.
#1  0x00007f30d124c6b7 in ?? () from /tmp/apport_sandbox_kekJFq/lib64/ld-linux-x86-64.so.2
No symbol table info available.
#2  0x00007f30d0c936a9 in __run_exit_handlers (status=status@entry=0, listp=0x7f30d10176c8 <__exit_funcs>, run_list_atexit=run_list_atexit@entry=true) at exit.c:82
        atfct = <optimized out>
        onfct = <optimized out>
        cxafct = <optimized out>
        f = <optimized out>
#3  0x00007f30d0c936f5 in __GI_exit (status=status@entry=0) at exit.c:104
No locals.
#4  0x00000000005469ef in Py_Exit (sts=sts@entry=0) at ../Python/pythonrun.c:1780
No locals.
#5  0x0000000000544047 in handle_system_exit () at ../Python/pythonrun.c:1152
        exception = 0x944600 <_PyExc_SystemExit>
        value = 0x26a1170
        tb = 0x7f30ce922cb0
        exitcode = 0
#6  0x0000000000543cbd in PyErr_PrintEx () at ../Python/pythonrun.c:1162
No locals.
#7  0x000000000042d88a in PyErr_Print () at ../Python/pythonrun.c:1065
No locals.
#8  PyRun_SimpleFileExFlags (fp=0xffffffff, filename=0x7fff752a06aa "/usr/bin/calibre-parallel", closeit=1, flags=0x1) at ../Python/pythonrun.c:953
        m = 0x7f30d13bbcc8
        d = 0x7f30d13cf168
        v = 0x99
        ret = 1965688511
#9  0x000000000049aeee in Py_Main () at ../Modules/main.c:640
        sts = -785490384
        command = 0x0
        filename = 0x7fff752a06aa "/usr/bin/calibre-parallel"
        module = 0x0
        help = 0
        saw_unbuffered_flag = 1965688490
        cf = {cf_flags = 0}
#10 0x00007f30d0c7aec5 in __libc_start_main (main=0x49a980 <main>, argc=2, argv=0x7fff7529f728, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fff7529f718) at libc-start.c:287
        result = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {0, -8058639983730711765, 4827255, 140735159072544, 0, 0, 8058945184330195755, 7946694102261867307}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x602880 <__libc_csu_init>, 0x7fff7529f728}, data = {prev = 0x0, cleanup = 0x0, canceltype = 6301824}}}
        not_first_call = <optimized out>
#11 0x000000000049a8a0 in _start ()
No symbol table info available.
.
Thread 1 (Thread 0x7f30b6436700 (LWP 23703)):
#0  0x00007f30b85370b9 in ?? ()
No symbol table info available.
#1  0x00007f30b6435ed0 in ?? ()
No symbol table info available.
#2  0x000000000351ac80 in ?? ()
No symbol table info available.
#3  0x00007f30b6435f10 in ?? ()
No symbol table info available.
#4  0x000000000351afe0 in ?? ()
No symbol table info available.
#5  0x0000000000000000 in ?? ()
No symbol table info available.