Application: kontact (5.7.3)

Qt Version: 5.9.5
Frameworks Version: 5.44.0
Operating System: Linux 4.15.0-33-generic x86_64
Distribution: Ubuntu 18.04.1 LTS

-- Information about the crash:
- What I was doing when the application crashed:
1. Fetch new mail
2. Click on new mail (single click) to open it in preview (no separate window)
3. Contact crashes

The e-mail only contains plain text and no HTML.

The crash can be reproduced sometimes.

-- Backtrace:
Application: Kontact (kontact), signal: Aborted
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f878dbc3600 (LWP 1698))]

Thread 31 (Thread 0x7f862c850700 (LWP 2093)):
#0  0x00007f87862f39f3 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x563eafdb25ac) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  0x00007f87862f39f3 in __pthread_cond_wait_common (abstime=0x0, mutex=0x563eafdb2558, cond=0x563eafdb2580) at pthread_cond_wait.c:502
#2  0x00007f87862f39f3 in __pthread_cond_wait (cond=0x563eafdb2580, mutex=0x563eafdb2558) at pthread_cond_wait.c:655
#3  0x00007f877b2e6c95 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#4  0x00007f877b2e7177 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#5  0x00007f877b2e7f11 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#6  0x00007f877b2e45eb in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#7  0x00007f87862ed6db in start_thread (arg=0x7f862c850700) at pthread_create.c:463
#8  0x00007f878a56e88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 30 (Thread 0x7f862ffff700 (LWP 1926)):
#0  0x00007f878426c8e7 in g_main_context_prepare () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007f878426d36b in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f878426d54c in g_main_context_iteration () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f878b0c790b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f878b06c9ea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f878ae8b22a in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f878ae9016d in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f87862ed6db in start_thread (arg=0x7f862ffff700) at pthread_create.c:463
#8  0x00007f878a56e88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 29 (Thread 0x7f863782a700 (LWP 1743)):
#0  0x00007f87862f39f3 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x563eb0225060) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  0x00007f87862f39f3 in __pthread_cond_wait_common (abstime=0x0, mutex=0x563eb0225010, cond=0x563eb0225038) at pthread_cond_wait.c:502
#2  0x00007f87862f39f3 in __pthread_cond_wait (cond=0x563eb0225038, mutex=0x563eb0225010) at pthread_cond_wait.c:655
#3  0x00007f878ae9159b in QWaitCondition::wait(QMutex*, unsigned long) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f878ae89c0b in QSemaphore::acquire(int) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f863c95880c in  () at /usr/lib/x86_64-linux-gnu/qt5/plugins/texttospeech/libqttexttospeech_flite.so
#6  0x00007f878ae9016d in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f87862ed6db in start_thread (arg=0x7f863782a700) at pthread_create.c:463
#8  0x00007f878a56e88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 28 (Thread 0x7f863d660700 (LWP 1741)):
#0  0x00007f87842b2959 in g_private_get () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007f8784295370 in g_thread_self () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f878426d53d in g_main_context_iteration () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f878b0c790b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f878b06c9ea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f878ae8b22a in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f878ae9016d in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f87862ed6db in start_thread (arg=0x7f863d660700) at pthread_create.c:463
#8  0x00007f878a56e88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 27 (Thread 0x7f864dfcb700 (LWP 1734)):
#0  0x00007f878a561bf9 in __GI___poll (fds=0x7f864400a190, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007f878426d439 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f878426d54c in g_main_context_iteration () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f878b0c790b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f878b06c9ea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f878ae8b22a in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f878ae9016d in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f87862ed6db in start_thread (arg=0x7f864dfcb700) at pthread_create.c:463
#8  0x00007f878a56e88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 26 (Thread 0x7f864e7cc700 (LWP 1731)):
#0  0x00007f878a55d079 in __GI___libc_read (fd=70, buf=0x7f864e7cb810, nbytes=16) at ../sysdeps/unix/sysv/linux/read.c:27
#1  0x00007f87842b1a00 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f878426cf27 in g_main_context_check () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f878426d3e0 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f878426d54c in g_main_context_iteration () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007f878b0c790b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f878b06c9ea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f878ae8b22a in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f878ae9016d in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#9  0x00007f87862ed6db in start_thread (arg=0x7f864e7cc700) at pthread_create.c:463
#10 0x00007f878a56e88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 25 (Thread 0x7f864f66b700 (LWP 1730)):
#0  0x00007f878a561bf9 in __GI___poll (fds=0x7f8648004a10, nfds=1, timeout=9334) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007f878426d439 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f878426d54c in g_main_context_iteration () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f878b0c790b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f878b06c9ea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f878ae8b22a in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f878ae9016d in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f87862ed6db in start_thread (arg=0x7f864f66b700) at pthread_create.c:463
#8  0x00007f878a56e88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 24 (Thread 0x7f86fd7fa700 (LWP 1729)):
#0  0x00007f87862f39f3 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x7f8775104fb8) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  0x00007f87862f39f3 in __pthread_cond_wait_common (abstime=0x0, mutex=0x7f8775104f68, cond=0x7f8775104f90) at pthread_cond_wait.c:502
#2  0x00007f87862f39f3 in __pthread_cond_wait (cond=0x7f8775104f90, mutex=0x7f8775104f68) at pthread_cond_wait.c:655
#3  0x00007f8774e0e5f4 in  () at /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#4  0x00007f8774e0e639 in  () at /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#5  0x00007f87862ed6db in start_thread (arg=0x7f86fd7fa700) at pthread_create.c:463
#6  0x00007f878a56e88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 23 (Thread 0x7f86fdffb700 (LWP 1727)):
#0  0x00007f87862f39f3 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x563eafdb25a8) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  0x00007f87862f39f3 in __pthread_cond_wait_common (abstime=0x0, mutex=0x563eafdb2558, cond=0x563eafdb2580) at pthread_cond_wait.c:502
#2  0x00007f87862f39f3 in __pthread_cond_wait (cond=0x563eafdb2580, mutex=0x563eafdb2558) at pthread_cond_wait.c:655
#3  0x00007f877b2e6c95 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#4  0x00007f877b2e7177 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#5  0x00007f877b2e7f11 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#6  0x00007f877b2e45eb in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#7  0x00007f87862ed6db in start_thread (arg=0x7f86fdffb700) at pthread_create.c:463
#8  0x00007f878a56e88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 22 (Thread 0x7f86fe7fc700 (LWP 1725)):
#0  0x00007f878a57d6ac in __lll_lock_wait_private () at ../sysdeps/unix/sysv/linux/x86_64/lowlevellock.S:95
#1  0x00007f878a57f474 in ___fprintf_chk (fp=0x7f878a83a8b0 <_IO_stdfile_2_lock>, flag=1, format=0x7f8773a126a8 "[%s] %s\n") at fprintf_chk.c:30
#2  0x00007f87739fa9ad in event_logv_ () at /usr/lib/x86_64-linux-gnu/libevent-2.1.so.6
#3  0x00007f87739fab44 in event_warn () at /usr/lib/x86_64-linux-gnu/libevent-2.1.so.6
#4  0x00007f87739fc46c in  () at /usr/lib/x86_64-linux-gnu/libevent-2.1.so.6
#5  0x00007f87739f2114 in event_base_loop () at /usr/lib/x86_64-linux-gnu/libevent-2.1.so.6
#6  0x00007f877b2b7ab9 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#7  0x00007f877b2b3da8 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#8  0x00007f877b2d077b in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#9  0x00007f877b2e84d6 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#10 0x00007f877b2e45eb in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#11 0x00007f87862ed6db in start_thread (arg=0x7f86fe7fc700) at pthread_create.c:463
#12 0x00007f878a56e88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 21 (Thread 0x7f86feffd700 (LWP 1724)):
#0  0x00007f87862f39f3 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x7f86feffc738) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  0x00007f87862f39f3 in __pthread_cond_wait_common (abstime=0x0, mutex=0x7f86feffc6e8, cond=0x7f86feffc710) at pthread_cond_wait.c:502
#2  0x00007f87862f39f3 in __pthread_cond_wait (cond=0x7f86feffc710, mutex=0x7f86feffc6e8) at pthread_cond_wait.c:655
#3  0x00007f877b2dc999 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#4  0x00007f877b2dc9c7 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#5  0x00007f877b2b74db in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#6  0x00007f877b2b3da8 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#7  0x00007f877b2d077b in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#8  0x00007f877b2e84d6 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#9  0x00007f877b2e45eb in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#10 0x00007f87862ed6db in start_thread (arg=0x7f86feffd700) at pthread_create.c:463
#11 0x00007f878a56e88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 20 (Thread 0x7f86ff7fe700 (LWP 1723)):
#0  0x00007f8757089eb9 in pa_pstream_ref () at /usr/lib/x86_64-linux-gnu/pulseaudio/libpulsecommon-11.1.so
#1  0x00007f875708aa41 in  () at /usr/lib/x86_64-linux-gnu/pulseaudio/libpulsecommon-11.1.so
#2  0x00007f875708b2cf in  () at /usr/lib/x86_64-linux-gnu/pulseaudio/libpulsecommon-11.1.so
#3  0x00007f87574f00d8 in pa_mainloop_dispatch () at /usr/lib/x86_64-linux-gnu/libpulse.so.0
#4  0x00007f87574f04ae in pa_mainloop_iterate () at /usr/lib/x86_64-linux-gnu/libpulse.so.0
#5  0x00007f87574f0530 in pa_mainloop_run () at /usr/lib/x86_64-linux-gnu/libpulse.so.0
#6  0x00007f87574fe399 in  () at /usr/lib/x86_64-linux-gnu/libpulse.so.0
#7  0x00007f875709b2a8 in  () at /usr/lib/x86_64-linux-gnu/pulseaudio/libpulsecommon-11.1.so
#8  0x00007f87862ed6db in start_thread (arg=0x7f86ff7fe700) at pthread_create.c:463
#9  0x00007f878a56e88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 19 (Thread 0x7f86fffff700 (LWP 1722)):
#0  0x00007f87862f3ed9 in futex_reltimed_wait_cancelable (private=<optimized out>, reltime=0x7f86ffffe5d0, expected=0, futex_word=0x7f86ffffe758) at ../sysdeps/unix/sysv/linux/futex-internal.h:142
#1  0x00007f87862f3ed9 in __pthread_cond_wait_common (abstime=0x7f86ffffe670, mutex=0x7f86ffffe708, cond=0x7f86ffffe730) at pthread_cond_wait.c:533
#2  0x00007f87862f3ed9 in __pthread_cond_timedwait (cond=0x7f86ffffe730, mutex=0x7f86ffffe708, abstime=0x7f86ffffe670) at pthread_cond_wait.c:667
#3  0x00007f877b315652 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#4  0x00007f877b2dc91e in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#5  0x00007f877b2b752b in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#6  0x00007f877b2b3da8 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#7  0x00007f877b2d077b in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#8  0x00007f877b2e84d6 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#9  0x00007f877b2e45eb in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#10 0x00007f87862ed6db in start_thread (arg=0x7f86fffff700) at pthread_create.c:463
#11 0x00007f878a56e88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 18 (Thread 0x7f871cff9700 (LWP 1721)):
#0  0x00007f87862f39f3 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x563eafdc12f8) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  0x00007f87862f39f3 in __pthread_cond_wait_common (abstime=0x0, mutex=0x563eafdc1238, cond=0x563eafdc12d0) at pthread_cond_wait.c:502
#2  0x00007f87862f39f3 in __pthread_cond_wait (cond=0x563eafdc12d0, mutex=0x563eafdc1238) at pthread_cond_wait.c:655
#3  0x00007f877ba6e060 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#4  0x00007f877b2e7f11 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#5  0x00007f877b2e45eb in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#6  0x00007f87862ed6db in start_thread (arg=0x7f871cff9700) at pthread_create.c:463
#7  0x00007f878a56e88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 17 (Thread 0x7f871d7fa700 (LWP 1720)):
#0  0x00007f87862f39f3 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x563eafdb25ac) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  0x00007f87862f39f3 in __pthread_cond_wait_common (abstime=0x0, mutex=0x563eafdb2558, cond=0x563eafdb2580) at pthread_cond_wait.c:502
#2  0x00007f87862f39f3 in __pthread_cond_wait (cond=0x563eafdb2580, mutex=0x563eafdb2558) at pthread_cond_wait.c:655
#3  0x00007f877b2e6c95 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#4  0x00007f877b2e7177 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#5  0x00007f877b2e7f11 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#6  0x00007f877b2e45eb in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#7  0x00007f87862ed6db in start_thread (arg=0x7f871d7fa700) at pthread_create.c:463
#8  0x00007f878a56e88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 16 (Thread 0x7f871dffb700 (LWP 1719)):
#0  0x00007f87862f39f3 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x7f871dffa738) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  0x00007f87862f39f3 in __pthread_cond_wait_common (abstime=0x0, mutex=0x7f871dffa6e8, cond=0x7f871dffa710) at pthread_cond_wait.c:502
#2  0x00007f87862f39f3 in __pthread_cond_wait (cond=0x7f871dffa710, mutex=0x7f871dffa6e8) at pthread_cond_wait.c:655
#3  0x00007f877b2dc999 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#4  0x00007f877b2dc9c7 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#5  0x00007f877b2b74db in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#6  0x00007f877b2b3da8 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#7  0x00007f877b2d077b in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#8  0x00007f877b2e84d6 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#9  0x00007f877b2e45eb in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#10 0x00007f87862ed6db in start_thread (arg=0x7f871dffb700) at pthread_create.c:463
#11 0x00007f878a56e88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 15 (Thread 0x7f871e7fc700 (LWP 1718)):
#0  0x00007f87862f6ce3 in _pthread_cleanup_pop_restore (buffer=0x7f871e7f85c0, execute=0) at cleanup_defer_compat.c:65
#1  0x00007f878a4ab73c in buffered_vfprintf (s=s@entry=0x7f878a839680 <_IO_2_1_stderr_>, format=format@entry=0x7f8773a126a8 "[%s] %s\n", args=args@entry=0x7f871e7faca0) at vfprintf.c:2357
#2  0x00007f878a4a8726 in _IO_vfprintf_internal (s=s@entry=0x7f878a839680 <_IO_2_1_stderr_>, format=0x7f8773a126a8 "[%s] %s\n", ap=ap@entry=0x7f871e7faca0) at vfprintf.c:1301
#3  0x00007f878a57f4c6 in ___fprintf_chk (fp=0x7f878a839680 <_IO_2_1_stderr_>, flag=1, format=<optimized out>) at fprintf_chk.c:35
#4  0x00007f87739fa9ad in event_logv_ () at /usr/lib/x86_64-linux-gnu/libevent-2.1.so.6
#5  0x00007f87739fab44 in event_warn () at /usr/lib/x86_64-linux-gnu/libevent-2.1.so.6
#6  0x00007f87739fc46c in  () at /usr/lib/x86_64-linux-gnu/libevent-2.1.so.6
#7  0x00007f87739f2114 in event_base_loop () at /usr/lib/x86_64-linux-gnu/libevent-2.1.so.6
#8  0x00007f877b2b7bf3 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#9  0x00007f877b2b3da8 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#10 0x00007f877b2d077b in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#11 0x00007f877ab6e978 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#12 0x00007f877ab6ef2b in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#13 0x00007f877b2e8588 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#14 0x00007f877b2e45eb in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#15 0x00007f87862ed6db in start_thread (arg=0x7f871e7fc700) at pthread_create.c:463
#16 0x00007f878a56e88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 14 (Thread 0x7f871effd700 (LWP 1717)):
#0  0x00007f87862f3ed9 in futex_reltimed_wait_cancelable (private=<optimized out>, reltime=0x7f871effc1f0, expected=0, futex_word=0x7f871effc378) at ../sysdeps/unix/sysv/linux/futex-internal.h:142
#1  0x00007f87862f3ed9 in __pthread_cond_wait_common (abstime=0x7f871effc290, mutex=0x7f871effc328, cond=0x7f871effc350) at pthread_cond_wait.c:533
#2  0x00007f87862f3ed9 in __pthread_cond_timedwait (cond=0x7f871effc350, mutex=0x7f871effc328, abstime=0x7f871effc290) at pthread_cond_wait.c:667
#3  0x00007f877b315652 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#4  0x00007f877b2dc91e in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#5  0x00007f877b2b752b in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#6  0x00007f877b2b3da8 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#7  0x00007f877b2d077b in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#8  0x00007f877ab6e8c8 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#9  0x00007f877ab6ef1b in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#10 0x00007f877b2e8588 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#11 0x00007f877b2e45eb in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#12 0x00007f87862ed6db in start_thread (arg=0x7f871effd700) at pthread_create.c:463
#13 0x00007f878a56e88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 13 (Thread 0x7f871f7fe700 (LWP 1716)):
#0  0x00007f87862f39f3 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x7f871f7fd358) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  0x00007f87862f39f3 in __pthread_cond_wait_common (abstime=0x0, mutex=0x7f871f7fd308, cond=0x7f871f7fd330) at pthread_cond_wait.c:502
#2  0x00007f87862f39f3 in __pthread_cond_wait (cond=0x7f871f7fd330, mutex=0x7f871f7fd308) at pthread_cond_wait.c:655
#3  0x00007f877b2dc999 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#4  0x00007f877b2dc9c7 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#5  0x00007f877b2b74db in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#6  0x00007f877b2b3da8 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#7  0x00007f877b2d077b in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#8  0x00007f877ab6e818 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#9  0x00007f877ab6ef0b in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#10 0x00007f877b2e8588 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#11 0x00007f877b2e45eb in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#12 0x00007f87862ed6db in start_thread (arg=0x7f871f7fe700) at pthread_create.c:463
#13 0x00007f878a56e88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 12 (Thread 0x7f871ffff700 (LWP 1715)):
#0  0x00007f87862f39f3 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x7f871fffe358) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  0x00007f87862f39f3 in __pthread_cond_wait_common (abstime=0x0, mutex=0x7f871fffe308, cond=0x7f871fffe330) at pthread_cond_wait.c:502
#2  0x00007f87862f39f3 in __pthread_cond_wait (cond=0x7f871fffe330, mutex=0x7f871fffe308) at pthread_cond_wait.c:655
#3  0x00007f877b2dc999 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#4  0x00007f877b2dc9c7 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#5  0x00007f877b2b74db in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#6  0x00007f877b2b3da8 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#7  0x00007f877b2d077b in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#8  0x00007f877ab6e768 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#9  0x00007f877ab6eefb in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#10 0x00007f877b2e8588 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#11 0x00007f877b2e45eb in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#12 0x00007f87862ed6db in start_thread (arg=0x7f871ffff700) at pthread_create.c:463
#13 0x00007f878a56e88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 11 (Thread 0x7f873cff9700 (LWP 1714)):
#0  0x00007f878a57d6ac in __lll_lock_wait_private () at ../sysdeps/unix/sysv/linux/x86_64/lowlevellock.S:95
#1  0x00007f878a57f474 in ___fprintf_chk (fp=0x7f878a83a8b0 <_IO_stdfile_2_lock>, flag=1, format=0x7f8773a126a8 "[%s] %s\n") at fprintf_chk.c:30
#2  0x00007f87739fa9ad in event_logv_ () at /usr/lib/x86_64-linux-gnu/libevent-2.1.so.6
#3  0x00007f87739fab44 in event_warn () at /usr/lib/x86_64-linux-gnu/libevent-2.1.so.6
#4  0x00007f87739fc46c in  () at /usr/lib/x86_64-linux-gnu/libevent-2.1.so.6
#5  0x00007f87739f2114 in event_base_loop () at /usr/lib/x86_64-linux-gnu/libevent-2.1.so.6
#6  0x00007f877b2b7ab9 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#7  0x00007f877b2b3da8 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#8  0x00007f877b2d077b in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#9  0x00007f877ab6e6b8 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#10 0x00007f877ab6eeeb in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#11 0x00007f877b2e8588 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#12 0x00007f877b2e45eb in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#13 0x00007f87862ed6db in start_thread (arg=0x7f873cff9700) at pthread_create.c:463
#14 0x00007f878a56e88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 10 (Thread 0x7f873d7fa700 (LWP 1713)):
#0  0x00007f87862f39f3 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x7f873d7f9358) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  0x00007f87862f39f3 in __pthread_cond_wait_common (abstime=0x0, mutex=0x7f873d7f9308, cond=0x7f873d7f9330) at pthread_cond_wait.c:502
#2  0x00007f87862f39f3 in __pthread_cond_wait (cond=0x7f873d7f9330, mutex=0x7f873d7f9308) at pthread_cond_wait.c:655
#3  0x00007f877b2dc999 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#4  0x00007f877b2dc9c7 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#5  0x00007f877b2b74db in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#6  0x00007f877b2b3da8 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#7  0x00007f877b2d077b in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#8  0x00007f877ab6e608 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#9  0x00007f877ab6eedb in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#10 0x00007f877b2e8588 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#11 0x00007f877b2e45eb in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#12 0x00007f87862ed6db in start_thread (arg=0x7f873d7fa700) at pthread_create.c:463
#13 0x00007f878a56e88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 9 (Thread 0x7f873dffb700 (LWP 1712)):
#0  0x00007f87862f3ed9 in futex_reltimed_wait_cancelable (private=<optimized out>, reltime=0x7f873dffa7e0, expected=0, futex_word=0x7f87300046b0) at ../sysdeps/unix/sysv/linux/futex-internal.h:142
#1  0x00007f87862f3ed9 in __pthread_cond_wait_common (abstime=0x7f873dffa880, mutex=0x7f8730004660, cond=0x7f8730004688) at pthread_cond_wait.c:533
#2  0x00007f87862f3ed9 in __pthread_cond_timedwait (cond=0x7f8730004688, mutex=0x7f8730004660, abstime=0x7f873dffa880) at pthread_cond_wait.c:667
#3  0x00007f877b315652 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#4  0x00007f877b2eb799 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#5  0x00007f877b2ebcfb in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#6  0x00007f877b2e45eb in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#7  0x00007f87862ed6db in start_thread (arg=0x7f873dffb700) at pthread_create.c:463
#8  0x00007f878a56e88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 8 (Thread 0x7f873e7fc700 (LWP 1711)):
#0  0x00007f87862f3ed9 in futex_reltimed_wait_cancelable (private=<optimized out>, reltime=0x7f873e7fb7e0, expected=0, futex_word=0x7f87300046b4) at ../sysdeps/unix/sysv/linux/futex-internal.h:142
#1  0x00007f87862f3ed9 in __pthread_cond_wait_common (abstime=0x7f873e7fb880, mutex=0x7f8730004660, cond=0x7f8730004688) at pthread_cond_wait.c:533
#2  0x00007f87862f3ed9 in __pthread_cond_timedwait (cond=0x7f8730004688, mutex=0x7f8730004660, abstime=0x7f873e7fb880) at pthread_cond_wait.c:667
#3  0x00007f877b315652 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#4  0x00007f877b2eb799 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#5  0x00007f877b2ebcfb in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#6  0x00007f877b2e45eb in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#7  0x00007f87862ed6db in start_thread (arg=0x7f873e7fc700) at pthread_create.c:463
#8  0x00007f878a56e88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 7 (Thread 0x7f873effd700 (LWP 1710)):
#0  0x00007f87862f39f3 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x7f873effc738) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  0x00007f87862f39f3 in __pthread_cond_wait_common (abstime=0x0, mutex=0x7f873effc6e8, cond=0x7f873effc710) at pthread_cond_wait.c:502
#2  0x00007f87862f39f3 in __pthread_cond_wait (cond=0x7f873effc710, mutex=0x7f873effc6e8) at pthread_cond_wait.c:655
#3  0x00007f877b2dc999 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#4  0x00007f877b2dc9c7 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#5  0x00007f877b2b74db in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#6  0x00007f877b2b3da8 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#7  0x00007f877b2d077b in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#8  0x00007f877b2e84d6 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#9  0x00007f877b2e45eb in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#10 0x00007f87862ed6db in start_thread (arg=0x7f873effd700) at pthread_create.c:463
#11 0x00007f878a56e88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 6 (Thread 0x7f873f7fe700 (LWP 1709)):
#0  0x00007f878a57d6ac in __lll_lock_wait_private () at ../sysdeps/unix/sysv/linux/x86_64/lowlevellock.S:95
#1  0x00007f878a57f474 in ___fprintf_chk (fp=0x7f878a83a8b0 <_IO_stdfile_2_lock>, flag=1, format=0x7f8773a126a8 "[%s] %s\n") at fprintf_chk.c:30
#2  0x00007f87739fa9ad in event_logv_ () at /usr/lib/x86_64-linux-gnu/libevent-2.1.so.6
#3  0x00007f87739fab44 in event_warn () at /usr/lib/x86_64-linux-gnu/libevent-2.1.so.6
#4  0x00007f87739fc46c in  () at /usr/lib/x86_64-linux-gnu/libevent-2.1.so.6
#5  0x00007f87739f2114 in event_base_loop () at /usr/lib/x86_64-linux-gnu/libevent-2.1.so.6
#6  0x00007f877b2b7ab9 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#7  0x00007f877b2b3da8 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#8  0x00007f877b2d077b in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#9  0x00007f877b2e84d6 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#10 0x00007f877b2e45eb in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#11 0x00007f87862ed6db in start_thread (arg=0x7f873f7fe700) at pthread_create.c:463
#12 0x00007f878a56e88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 5 (Thread 0x7f873ffff700 (LWP 1708)):
#0  0x00007f878a5316c2 in __GI___waitpid (pid=1705, stat_loc=0x0, options=0) at ../sysdeps/unix/sysv/linux/waitpid.c:30
#1  0x00007f877b2cc4be in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#2  0x00007f877b2e45eb in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#3  0x00007f87862ed6db in start_thread (arg=0x7f873ffff700) at pthread_create.c:463
#4  0x00007f878a56e88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 4 (Thread 0x7f874e851700 (LWP 1702)):
#0  0x00007ffd815e3ad5 in clock_gettime ()
#1  0x00007f878a57dea6 in __GI___clock_gettime (clock_id=1, tp=0x7f874e850760) at ../sysdeps/unix/clock_gettime.c:115
#2  0x00007f878b0c7221 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#3  0x00007f878b0c5a59 in QTimerInfoList::updateCurrentTime() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f878b0c6035 in QTimerInfoList::timerWait(timespec&) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f878b0c767e in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f878426c998 in g_main_context_prepare () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#7  0x00007f878426d36b in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#8  0x00007f878426d54c in g_main_context_iteration () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#9  0x00007f878b0c790b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#10 0x00007f878b06c9ea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#11 0x00007f878ae8b22a in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#12 0x00007f87897d5d45 in  () at /usr/lib/x86_64-linux-gnu/libQt5DBus.so.5
#13 0x00007f878ae9016d in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#14 0x00007f87862ed6db in start_thread (arg=0x7f874e851700) at pthread_create.c:463
#15 0x00007f878a56e88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 3 (Thread 0x7f874f4e9700 (LWP 1701)):
#0  0x00007f87862f39f3 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x563eafc05738) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  0x00007f87862f39f3 in __pthread_cond_wait_common (abstime=0x0, mutex=0x563eafc056e8, cond=0x563eafc05710) at pthread_cond_wait.c:502
#2  0x00007f87862f39f3 in __pthread_cond_wait (cond=0x563eafc05710, mutex=0x563eafc056e8) at pthread_cond_wait.c:655
#3  0x00007f87548d746b in  () at /usr/lib/x86_64-linux-gnu/dri/nouveau_dri.so
#4  0x00007f87548d7197 in  () at /usr/lib/x86_64-linux-gnu/dri/nouveau_dri.so
#5  0x00007f87862ed6db in start_thread (arg=0x7f874f4e9700) at pthread_create.c:463
#6  0x00007f878a56e88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 2 (Thread 0x7f875e205700 (LWP 1700)):
#0  0x00007f878a561bf9 in __GI___poll (fds=0x7f875e204928, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007f8785d2b747 in  () at /usr/lib/x86_64-linux-gnu/libxcb.so.1
#2  0x00007f8785d2d36a in xcb_wait_for_event () at /usr/lib/x86_64-linux-gnu/libxcb.so.1
#3  0x00007f875ff002a9 in  () at /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#4  0x00007f878ae9016d in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f87862ed6db in start_thread (arg=0x7f875e205700) at pthread_create.c:463
#6  0x00007f878a56e88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 1 (Thread 0x7f878dbc3600 (LWP 1698)):
[KCrash Handler]
#6  0x00007f878a48be97 in __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:51
#7  0x00007f878a48d801 in __GI_abort () at abort.c:79
#8  0x00007f878a47d39a in __assert_fail_base (fmt=0x7f878dba3195 "%s%s%s:%u: %s%sZusicherung \302\273%s\302\253 nicht erf\303\274llt.\n%n", assertion=assertion@entry=0x7f8754185743 "kref", file=file@entry=0x7f875418572a "../../nouveau/pushbuf.c", line=line@entry=727, function=function@entry=0x7f8754185770 "nouveau_pushbuf_data") at assert.c:92
#9  0x00007f878a47d412 in __GI___assert_fail (assertion=0x7f8754185743 "kref", file=0x7f875418572a "../../nouveau/pushbuf.c", line=727, function=0x7f8754185770 "nouveau_pushbuf_data") at assert.c:101
#10 0x00007f8754183b8d in  () at /usr/lib/x86_64-linux-gnu/libdrm_nouveau.so.2
#11 0x00007f8754183b46 in nouveau_pushbuf_data () at /usr/lib/x86_64-linux-gnu/libdrm_nouveau.so.2
#12 0x00007f8754183c14 in  () at /usr/lib/x86_64-linux-gnu/libdrm_nouveau.so.2
#13 0x00007f8754183ebf in  () at /usr/lib/x86_64-linux-gnu/libdrm_nouveau.so.2
#14 0x00007f8754184a50 in nouveau_pushbuf_kick () at /usr/lib/x86_64-linux-gnu/libdrm_nouveau.so.2
#15 0x00007f8754b47ef6 in  () at /usr/lib/x86_64-linux-gnu/dri/nouveau_dri.so
#16 0x00007f8754817e0b in  () at /usr/lib/x86_64-linux-gnu/dri/nouveau_dri.so
#17 0x00007f875497b17a in  () at /usr/lib/x86_64-linux-gnu/dri/nouveau_dri.so
#18 0x00007f87560f60c8 in  () at /usr/lib/x86_64-linux-gnu/libGLX_mesa.so.0
#19 0x00007f875d7fd8f2 in  () at /usr/lib/x86_64-linux-gnu/qt5/plugins/xcbglintegrations/libqxcb-glx-integration.so
#20 0x00007f878b66a00a in QOpenGLContext::swapBuffers(QSurface*) () at /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
#21 0x00007f878b91eb4f in QPlatformBackingStore::composeAndFlush(QWindow*, QRegion const&, QPoint const&, QPlatformTextureList*, QOpenGLContext*, bool) () at /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
#22 0x00007f875ff1fdf7 in  () at /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#23 0x00007f878bdf9067 in  () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#24 0x00007f878bdfc67e in  () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#25 0x00007f878be47d2e in  () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#26 0x00007f878be4864d in  () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#27 0x00007f878bdec82c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#28 0x00007f878bdf40f4 in QApplication::notify(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#29 0x00007f878b06e9a8 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#30 0x00007f878b63143f in QGuiApplicationPrivate::processExposeEvent(QWindowSystemInterfacePrivate::ExposeEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
#31 0x00007f878b63207d in QGuiApplicationPrivate::processWindowSystemEvent(QWindowSystemInterfacePrivate::WindowSystemEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
#32 0x00007f878b6092eb in QWindowSystemInterface::sendWindowSystemEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
#33 0x00007f875ff631c0 in  () at /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#34 0x00007f878426d287 in g_main_context_dispatch () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#35 0x00007f878426d4c0 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#36 0x00007f878426d54c in g_main_context_iteration () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#37 0x00007f878b0c78ef in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#38 0x00007f878b06c9ea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#39 0x00007f878b075a84 in QCoreApplication::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#40 0x0000563ead9dc48d in  ()
#41 0x00007f878a46eb97 in __libc_start_main (main=0x563ead9db630, argc=1, argv=0x7ffd8159e518, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7ffd8159e508) at ../csu/libc-start.c:310
#42 0x0000563ead9dcaea in _start ()

Possible duplicates by query: bug 387553, bug 386263.

Reported using DrKonqi