Application: kontact (5.13.3 (19.12.3))

Qt Version: 5.12.8
Frameworks Version: 5.68.0
Operating System: Linux 5.4.0-37-generic x86_64
Windowing system: X11
Distribution: Ubuntu 20.04 LTS

-- Information about the crash:
I have 3 resources from IMAP, if I joum 2 or 3 times from one folder of resource 2 to a folder of resource 3 end back, then kmail chrashes

The crash can be reproduced every time.

-- 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 0x7fad378c1f00 (LWP 21721))]

Thread 25 (Thread 0x7facd4bf9700 (LWP 25312)):
#0  futex_abstimed_wait_cancelable (private=<optimized out>, abstime=0x7facd4bf84a0, clockid=<optimized out>, expected=0, futex_word=0x7facd4bf85e8) at ../sysdeps/nptl/futex-internal.h:320
#1  __pthread_cond_wait_common (abstime=0x7facd4bf84a0, clockid=<optimized out>, mutex=0x7facd4bf8598, cond=0x7facd4bf85c0) at pthread_cond_wait.c:520
#2  __pthread_cond_timedwait (cond=0x7facd4bf85c0, mutex=0x7facd4bf8598, abstime=0x7facd4bf84a0) at pthread_cond_wait.c:656
#3  0x00007fad4407ab2e in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#4  0x00007fad4407b51f in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#5  0x00007fad4407b615 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#6  0x00007fad4403cda6 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#7  0x00007fad4403fc48 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#8  0x00007fad4403fef8 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#9  0x00007fad4407db63 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#10 0x00007fad49ad7609 in start_thread (arg=<optimized out>) at pthread_create.c:477
#11 0x00007fad4aaec103 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 24 (Thread 0x7fad117fa700 (LWP 25306)):
#0  0x00007fad4913d09d in g_source_ref () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007fad4913d168 in ?? () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fad4913e66b in g_main_context_prepare () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fad4913f0db in ?? () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007fad4913f2e3 in g_main_context_iteration () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007fad4b098583 in QEventDispatcherGlib::processEvents (this=0x7facf40062d0, flags=...) at kernel/qeventdispatcher_glib.cpp:424
#6  0x00007fad4b03f4db in QEventLoop::exec (this=this@entry=0x7fad117f96a0, flags=..., flags@entry=...) at ../../include/QtCore/../../src/corelib/global/qflags.h:140
#7  0x00007fad4ae77785 in QThread::exec (this=<optimized out>) at ../../include/QtCore/../../src/corelib/global/qflags.h:120
#8  0x00007fad4ae789d2 in QThreadPrivate::start (arg=0x564b0031d850) at thread/qthread_unix.cpp:361
#9  0x00007fad49ad7609 in start_thread (arg=<optimized out>) at pthread_create.c:477
#10 0x00007fad4aaec103 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 23 (Thread 0x7fac93276700 (LWP 21777)):
#0  syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:38
#1  0x00007fad4ae7add1 in QtLinuxFutex::_q_futex (val3=0, addr2=0x0, val2=0, val=<optimized out>, op=0, addr=<optimized out>) at thread/qfutex_p.h:105
#2  QtLinuxFutex::futexWait<QBasicAtomicInteger<unsigned int> > (expectedValue=<optimized out>, futex=...) at thread/qfutex_p.h:107
#3  futexSemaphoreTryAcquire_loop<false> (timeout=-1, nn=8589934593, curValue=<optimized out>, u=...) at thread/qsemaphore.cpp:219
#4  futexSemaphoreTryAcquire<false> (timeout=-1, n=<optimized out>, u=...) at thread/qsemaphore.cpp:262
#5  QSemaphore::acquire (this=0x564aff9955b8, n=<optimized out>) at thread/qsemaphore.cpp:326
#6  0x00007faca00c372c in ?? () from /usr/lib/x86_64-linux-gnu/qt5/plugins/texttospeech/libqttexttospeech_flite.so
#7  0x00007fad4ae789d2 in QThreadPrivate::start (arg=0x564aff995580) at thread/qthread_unix.cpp:361
#8  0x00007fad49ad7609 in start_thread (arg=<optimized out>) at pthread_create.c:477
#9  0x00007fad4aaec103 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 22 (Thread 0x7fac93fff700 (LWP 21775)):
#0  0x00007fad4913f2b0 in g_main_context_iteration () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007fad4b098583 in QEventDispatcherGlib::processEvents (this=0x7fac8c000b60, flags=...) at kernel/qeventdispatcher_glib.cpp:424
#2  0x00007fad4b03f4db in QEventLoop::exec (this=this@entry=0x7fac93ffe6a0, flags=..., flags@entry=...) at ../../include/QtCore/../../src/corelib/global/qflags.h:140
#3  0x00007fad4ae77785 in QThread::exec (this=<optimized out>) at ../../include/QtCore/../../src/corelib/global/qflags.h:120
#4  0x00007fad4ae789d2 in QThreadPrivate::start (arg=0x564aff9479d0) at thread/qthread_unix.cpp:361
#5  0x00007fad49ad7609 in start_thread (arg=<optimized out>) at pthread_create.c:477
#6  0x00007fad4aaec103 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 21 (Thread 0x7faca11c5700 (LWP 21767)):
#0  0x00007fad4913b737 in ?? () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007fad4913d185 in ?? () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fad4913eaff in g_main_context_check () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fad4913f152 in ?? () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007fad4913f2e3 in g_main_context_iteration () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007fad4b098583 in QEventDispatcherGlib::processEvents (this=0x7fac98000b60, flags=...) at kernel/qeventdispatcher_glib.cpp:424
#6  0x00007fad4b03f4db in QEventLoop::exec (this=this@entry=0x7faca11c46a0, flags=..., flags@entry=...) at ../../include/QtCore/../../src/corelib/global/qflags.h:140
#7  0x00007fad4ae77785 in QThread::exec (this=<optimized out>) at ../../include/QtCore/../../src/corelib/global/qflags.h:120
#8  0x00007fad4ae789d2 in QThreadPrivate::start (arg=0x564aff7b78b0) at thread/qthread_unix.cpp:361
#9  0x00007fad49ad7609 in start_thread (arg=<optimized out>) at pthread_create.c:477
#10 0x00007fad4aaec103 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 20 (Thread 0x7faca19c6700 (LWP 21766)):
#0  0x00007fad4aadf96f in __GI___poll (fds=0x7fac940029e0, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007fad4913f1ae in ?? () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fad4913f2e3 in g_main_context_iteration () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fad4b098583 in QEventDispatcherGlib::processEvents (this=0x7fac94000b60, flags=...) at kernel/qeventdispatcher_glib.cpp:424
#4  0x00007fad4b03f4db in QEventLoop::exec (this=this@entry=0x7faca19c56a0, flags=..., flags@entry=...) at ../../include/QtCore/../../src/corelib/global/qflags.h:140
#5  0x00007fad4ae77785 in QThread::exec (this=<optimized out>) at ../../include/QtCore/../../src/corelib/global/qflags.h:120
#6  0x00007fad4ae789d2 in QThreadPrivate::start (arg=0x564aff7d1840) at thread/qthread_unix.cpp:361
#7  0x00007fad49ad7609 in start_thread (arg=<optimized out>) at pthread_create.c:477
#8  0x00007fad4aaec103 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 19 (Thread 0x7faca229b700 (LWP 21765)):
#0  0x00007fad4aadf96f in __GI___poll (fds=0x7fac9c0025e0, nfds=1, timeout=9244) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007fad4913f1ae in ?? () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fad4913f2e3 in g_main_context_iteration () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fad4b098583 in QEventDispatcherGlib::processEvents (this=0x7fac9c000b60, flags=...) at kernel/qeventdispatcher_glib.cpp:424
#4  0x00007fad4b03f4db in QEventLoop::exec (this=this@entry=0x7faca229a6a0, flags=..., flags@entry=...) at ../../include/QtCore/../../src/corelib/global/qflags.h:140
#5  0x00007fad4ae77785 in QThread::exec (this=<optimized out>) at ../../include/QtCore/../../src/corelib/global/qflags.h:120
#6  0x00007fad4ae789d2 in QThreadPrivate::start (arg=0x564aff5d6b90) at thread/qthread_unix.cpp:361
#7  0x00007fad49ad7609 in start_thread (arg=<optimized out>) at pthread_create.c:477
#8  0x00007fad4aaec103 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 18 (Thread 0x7facd5bfb700 (LWP 21751)):
#0  futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x7facd5bfa5f8) at ../sysdeps/nptl/futex-internal.h:183
#1  __pthread_cond_wait_common (abstime=0x0, clockid=0, mutex=0x7facd5bfa5a8, cond=0x7facd5bfa5d0) at pthread_cond_wait.c:508
#2  __pthread_cond_wait (cond=0x7facd5bfa5d0, mutex=0x7facd5bfa5a8) at pthread_cond_wait.c:638
#3  0x00007fad4407aa5e in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#4  0x00007fad4407b530 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#5  0x00007fad4407b5d3 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#6  0x00007fad4403cdb8 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#7  0x00007fad4403fc48 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#8  0x00007fad4403ffb8 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#9  0x00007fad4407db63 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#10 0x00007fad49ad7609 in start_thread (arg=<optimized out>) at pthread_create.c:477
#11 0x00007fad4aaec103 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 17 (Thread 0x7facd63fc700 (LWP 21750)):
#0  0x00007fad4aaec43e in epoll_wait (epfd=62, events=0x7facac002050, maxevents=32, timeout=29401) at ../sysdeps/unix/sysv/linux/epoll_wait.c:30
#1  0x00007fad3ee035e9 in ?? () from /usr/lib/x86_64-linux-gnu/libevent-2.1.so.7
#2  0x00007fad3edf9625 in event_base_loop () from /usr/lib/x86_64-linux-gnu/libevent-2.1.so.7
#3  0x00007fad44081454 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#4  0x00007fad4401ae9f in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#5  0x00007fad440457e1 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#6  0x00007fad4407db63 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#7  0x00007fad49ad7609 in start_thread (arg=<optimized out>) at pthread_create.c:477
#8  0x00007fad4aaec103 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 16 (Thread 0x7facd77fe700 (LWP 21748)):
#0  __GI___libc_read (nbytes=10, buf=0x7facd77fd4de, fd=49) at ../sysdeps/unix/sysv/linux/read.c:26
#1  __GI___libc_read (fd=49, buf=0x7facd77fd4de, nbytes=10) at ../sysdeps/unix/sysv/linux/read.c:24
#2  0x00007fad10680955 in pa_read () from /usr/lib/x86_64-linux-gnu/pulseaudio/libpulsecommon-13.99.so
#3  0x00007fad10702416 in pa_mainloop_prepare () from /usr/lib/x86_64-linux-gnu/libpulse.so.0
#4  0x00007fad10702eb4 in pa_mainloop_iterate () from /usr/lib/x86_64-linux-gnu/libpulse.so.0
#5  0x00007fad10702f70 in pa_mainloop_run () from /usr/lib/x86_64-linux-gnu/libpulse.so.0
#6  0x00007fad1071111d in ?? () from /usr/lib/x86_64-linux-gnu/libpulse.so.0
#7  0x00007fad106af57c in ?? () from /usr/lib/x86_64-linux-gnu/pulseaudio/libpulsecommon-13.99.so
#8  0x00007fad49ad7609 in start_thread (arg=<optimized out>) at pthread_create.c:477
#9  0x00007fad4aaec103 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 15 (Thread 0x7facd7fff700 (LWP 21747)):
#0  __lll_lock_wait_private (futex=0x7fad4abb84b0 <_IO_stdfile_2_lock>) at ./lowlevellock.c:35
#1  0x00007fad4aa471f6 in buffered_vfprintf (s=s@entry=0x7fad4abb65c0 <_IO_2_1_stderr_>, format=format@entry=0x7fad3ee1b258 "[%s] %s\n", args=args@entry=0x7facd7ffdef0, mode_flags=mode_flags@entry=2) at vfprintf-internal.c:2381
#2  0x00007fad4aa43ea4 in __vfprintf_internal (s=0x7fad4abb65c0 <_IO_2_1_stderr_>, format=0x7fad3ee1b258 "[%s] %s\n", ap=ap@entry=0x7facd7ffdef0, mode_flags=2) at vfprintf-internal.c:1346
#3  0x00007fad4aafb023 in ___fprintf_chk (fp=<optimized out>, flag=<optimized out>, format=<optimized out>) at fprintf_chk.c:33
#4  0x00007fad3ee01b36 in event_logv_ () from /usr/lib/x86_64-linux-gnu/libevent-2.1.so.7
#5  0x00007fad3ee01d09 in event_warn () from /usr/lib/x86_64-linux-gnu/libevent-2.1.so.7
#6  0x00007fad3ee03768 in ?? () from /usr/lib/x86_64-linux-gnu/libevent-2.1.so.7
#7  0x00007fad3edf9625 in event_base_loop () from /usr/lib/x86_64-linux-gnu/libevent-2.1.so.7
#8  0x00007fad4408136a in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#9  0x00007fad4401ae9f in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#10 0x00007fad440457e1 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#11 0x00007fad4407db63 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#12 0x00007fad49ad7609 in start_thread (arg=<optimized out>) at pthread_create.c:477
#13 0x00007fad4aaec103 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 14 (Thread 0x7facf8ff9700 (LWP 21746)):
#0  futex_abstimed_wait_cancelable (private=<optimized out>, abstime=0x7facf8ff8460, clockid=<optimized out>, expected=0, futex_word=0x7facf8ff85a8) at ../sysdeps/nptl/futex-internal.h:320
#1  __pthread_cond_wait_common (abstime=0x7facf8ff8460, clockid=<optimized out>, mutex=0x7facf8ff8558, cond=0x7facf8ff8580) at pthread_cond_wait.c:520
#2  __pthread_cond_timedwait (cond=0x7facf8ff8580, mutex=0x7facf8ff8558, abstime=0x7facf8ff8460) at pthread_cond_wait.c:656
#3  0x00007fad4407ab2e in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#4  0x00007fad4407b51f in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#5  0x00007fad43ff84f8 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#6  0x00007fad4401ae9f in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#7  0x00007fad440457e1 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#8  0x00007fad4407db63 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#9  0x00007fad49ad7609 in start_thread (arg=<optimized out>) at pthread_create.c:477
#10 0x00007fad4aaec103 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 13 (Thread 0x7facf97fa700 (LWP 21745)):
#0  futex_abstimed_wait_cancelable (private=<optimized out>, abstime=0x7facf97f9460, clockid=<optimized out>, expected=0, futex_word=0x7facf97f95a8) at ../sysdeps/nptl/futex-internal.h:320
#1  __pthread_cond_wait_common (abstime=0x7facf97f9460, clockid=<optimized out>, mutex=0x7facf97f9558, cond=0x7facf97f9580) at pthread_cond_wait.c:520
#2  __pthread_cond_timedwait (cond=0x7facf97f9580, mutex=0x7facf97f9558, abstime=0x7facf97f9460) at pthread_cond_wait.c:656
#3  0x00007fad4407ab2e in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#4  0x00007fad4407b51f in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#5  0x00007fad43ff84f8 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#6  0x00007fad4401ae9f in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#7  0x00007fad440457e1 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#8  0x00007fad4407db63 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#9  0x00007fad49ad7609 in start_thread (arg=<optimized out>) at pthread_create.c:477
#10 0x00007fad4aaec103 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 12 (Thread 0x7facf9ffb700 (LWP 21744)):
#0  futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x564aff4f7a58) at ../sysdeps/nptl/futex-internal.h:183
#1  __pthread_cond_wait_common (abstime=0x0, clockid=0, mutex=0x564aff4f7998, cond=0x564aff4f7a30) at pthread_cond_wait.c:508
#2  __pthread_cond_wait (cond=0x564aff4f7a30, mutex=0x564aff4f7998) at pthread_cond_wait.c:638
#3  0x00007fad4407aa5e in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#4  0x00007fad44866458 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#5  0x00007fad4404d5e1 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#6  0x00007fad4407db63 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#7  0x00007fad49ad7609 in start_thread (arg=<optimized out>) at pthread_create.c:477
#8  0x00007fad4aaec103 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 11 (Thread 0x7facfa7fc700 (LWP 21743)):
#0  futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x7facfa7fb5f8) at ../sysdeps/nptl/futex-internal.h:183
#1  __pthread_cond_wait_common (abstime=0x0, clockid=0, mutex=0x7facfa7fb5a8, cond=0x7facfa7fb5d0) at pthread_cond_wait.c:508
#2  __pthread_cond_wait (cond=0x7facfa7fb5d0, mutex=0x7facfa7fb5a8) at pthread_cond_wait.c:638
#3  0x00007fad4407aa5e in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#4  0x00007fad4407b530 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#5  0x00007fad4407b5d3 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#6  0x00007fad4403cdb8 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#7  0x00007fad4403fc48 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#8  0x00007fad4403ff58 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#9  0x00007fad4407db63 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#10 0x00007fad49ad7609 in start_thread (arg=<optimized out>) at pthread_create.c:477
#11 0x00007fad4aaec103 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 10 (Thread 0x7fad10ff9700 (LWP 21739)):
#0  0x00007fad4aa4721f in buffered_vfprintf (s=s@entry=0x7fad4abb65c0 <_IO_2_1_stderr_>, format=format@entry=0x7fad3ee1b258 "[%s] %s\n", args=args@entry=0x7fad10ff7ed0, mode_flags=mode_flags@entry=2) at vfprintf-internal.c:2401
#1  0x00007fad4aa43ea4 in __vfprintf_internal (s=0x7fad4abb65c0 <_IO_2_1_stderr_>, format=0x7fad3ee1b258 "[%s] %s\n", ap=ap@entry=0x7fad10ff7ed0, mode_flags=2) at vfprintf-internal.c:1346
#2  0x00007fad4aafb023 in ___fprintf_chk (fp=<optimized out>, flag=<optimized out>, format=<optimized out>) at fprintf_chk.c:33
#3  0x00007fad3ee01b36 in event_logv_ () from /usr/lib/x86_64-linux-gnu/libevent-2.1.so.7
#4  0x00007fad3ee01d09 in event_warn () from /usr/lib/x86_64-linux-gnu/libevent-2.1.so.7
#5  0x00007fad3ee03768 in ?? () from /usr/lib/x86_64-linux-gnu/libevent-2.1.so.7
#6  0x00007fad3edf9625 in event_base_loop () from /usr/lib/x86_64-linux-gnu/libevent-2.1.so.7
#7  0x00007fad44081318 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#8  0x00007fad4401ae9f in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#9  0x00007fad439a97b8 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#10 0x00007fad440457e1 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#11 0x00007fad4407db63 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#12 0x00007fad49ad7609 in start_thread (arg=<optimized out>) at pthread_create.c:477
#13 0x00007fad4aaec103 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 9 (Thread 0x7fad11ffb700 (LWP 21737)):
#0  futex_abstimed_wait_cancelable (private=<optimized out>, abstime=0x7fad11ffa4a0, clockid=<optimized out>, expected=0, futex_word=0x7fad11ffa5e8) at ../sysdeps/nptl/futex-internal.h:320
#1  __pthread_cond_wait_common (abstime=0x7fad11ffa4a0, clockid=<optimized out>, mutex=0x7fad11ffa598, cond=0x7fad11ffa5c0) at pthread_cond_wait.c:520
#2  __pthread_cond_timedwait (cond=0x7fad11ffa5c0, mutex=0x7fad11ffa598, abstime=0x7fad11ffa4a0) at pthread_cond_wait.c:656
#3  0x00007fad4407ab2e in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#4  0x00007fad4407b51f in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#5  0x00007fad4407b615 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#6  0x00007fad4403cda6 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#7  0x00007fad4403fc48 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#8  0x00007fad4403fef8 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#9  0x00007fad4407db63 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#10 0x00007fad49ad7609 in start_thread (arg=<optimized out>) at pthread_create.c:477
#11 0x00007fad4aaec103 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 8 (Thread 0x7fad127fc700 (LWP 21736)):
#0  __lll_lock_wait_private (futex=0x7fad4abb84b0 <_IO_stdfile_2_lock>) at ./lowlevellock.c:35
#1  0x00007fad4aa471f6 in buffered_vfprintf (s=s@entry=0x7fad4abb65c0 <_IO_2_1_stderr_>, format=format@entry=0x7fad3ee1b258 "[%s] %s\n", args=args@entry=0x7fad127faed0, mode_flags=mode_flags@entry=2) at vfprintf-internal.c:2381
#2  0x00007fad4aa43ea4 in __vfprintf_internal (s=0x7fad4abb65c0 <_IO_2_1_stderr_>, format=0x7fad3ee1b258 "[%s] %s\n", ap=ap@entry=0x7fad127faed0, mode_flags=2) at vfprintf-internal.c:1346
#3  0x00007fad4aafb023 in ___fprintf_chk (fp=<optimized out>, flag=<optimized out>, format=<optimized out>) at fprintf_chk.c:33
#4  0x00007fad3ee01b36 in event_logv_ () from /usr/lib/x86_64-linux-gnu/libevent-2.1.so.7
#5  0x00007fad3ee01d09 in event_warn () from /usr/lib/x86_64-linux-gnu/libevent-2.1.so.7
#6  0x00007fad3ee03768 in ?? () from /usr/lib/x86_64-linux-gnu/libevent-2.1.so.7
#7  0x00007fad3edf9625 in event_base_loop () from /usr/lib/x86_64-linux-gnu/libevent-2.1.so.7
#8  0x00007fad44081318 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#9  0x00007fad4401ae9f in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#10 0x00007fad440432f8 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#11 0x00007fad440457e1 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#12 0x00007fad4407db63 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#13 0x00007fad49ad7609 in start_thread (arg=<optimized out>) at pthread_create.c:477
#14 0x00007fad4aaec103 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 7 (Thread 0x7fad12ffd700 (LWP 21735)):
#0  __lll_lock_wait_private (futex=0x7fad4abb84b0 <_IO_stdfile_2_lock>) at ./lowlevellock.c:35
#1  0x00007fad4aa471f6 in buffered_vfprintf (s=s@entry=0x7fad4abb65c0 <_IO_2_1_stderr_>, format=format@entry=0x7fad3ee1b258 "[%s] %s\n", args=args@entry=0x7fad12ffbef0, mode_flags=mode_flags@entry=2) at vfprintf-internal.c:2381
#2  0x00007fad4aa43ea4 in __vfprintf_internal (s=0x7fad4abb65c0 <_IO_2_1_stderr_>, format=0x7fad3ee1b258 "[%s] %s\n", ap=ap@entry=0x7fad12ffbef0, mode_flags=2) at vfprintf-internal.c:1346
#3  0x00007fad4aafb023 in ___fprintf_chk (fp=<optimized out>, flag=<optimized out>, format=<optimized out>) at fprintf_chk.c:33
#4  0x00007fad3ee01b36 in event_logv_ () from /usr/lib/x86_64-linux-gnu/libevent-2.1.so.7
#5  0x00007fad3ee01d09 in event_warn () from /usr/lib/x86_64-linux-gnu/libevent-2.1.so.7
#6  0x00007fad3ee03768 in ?? () from /usr/lib/x86_64-linux-gnu/libevent-2.1.so.7
#7  0x00007fad3edf9625 in event_base_loop () from /usr/lib/x86_64-linux-gnu/libevent-2.1.so.7
#8  0x00007fad4408136a in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#9  0x00007fad4401ae9f in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#10 0x00007fad440457e1 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#11 0x00007fad4407db63 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#12 0x00007fad49ad7609 in start_thread (arg=<optimized out>) at pthread_create.c:477
#13 0x00007fad4aaec103 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 6 (Thread 0x7fad29d24700 (LWP 21728)):
#0  0x00007fad4918c368 in g_mutex_unlock () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007fad4913f2ee in g_main_context_iteration () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fad4b098583 in QEventDispatcherGlib::processEvents (this=0x7fad18000b60, flags=...) at kernel/qeventdispatcher_glib.cpp:424
#3  0x00007fad4b03f4db in QEventLoop::exec (this=this@entry=0x7fad29d23670, flags=..., flags@entry=...) at ../../include/QtCore/../../src/corelib/global/qflags.h:140
#4  0x00007fad4ae77785 in QThread::exec (this=<optimized out>) at ../../include/QtCore/../../src/corelib/global/qflags.h:120
#5  0x00007fad4a4a1efa in ?? () from /usr/lib/x86_64-linux-gnu/libQt5DBus.so.5
#6  0x00007fad4ae789d2 in QThreadPrivate::start (arg=0x7fad4a524d80) at thread/qthread_unix.cpp:361
#7  0x00007fad49ad7609 in start_thread (arg=<optimized out>) at pthread_create.c:477
#8  0x00007fad4aaec103 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 5 (Thread 0x7fad2a5ad700 (LWP 21727)):
#0  futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x7fad300046c8) at ../sysdeps/nptl/futex-internal.h:183
#1  __pthread_cond_wait_common (abstime=0x0, clockid=0, mutex=0x7fad30004678, cond=0x7fad300046a0) at pthread_cond_wait.c:508
#2  __pthread_cond_wait (cond=0x7fad300046a0, mutex=0x7fad30004678) at pthread_cond_wait.c:638
#3  0x00007fad348c93db in ?? () from /usr/lib/x86_64-linux-gnu/dri/nouveau_dri.so
#4  0x00007fad348c8feb in ?? () from /usr/lib/x86_64-linux-gnu/dri/nouveau_dri.so
#5  0x00007fad49ad7609 in start_thread (arg=<optimized out>) at pthread_create.c:477
#6  0x00007fad4aaec103 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 4 (Thread 0x7fad2adae700 (LWP 21726)):
#0  futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x7fad300046c8) at ../sysdeps/nptl/futex-internal.h:183
#1  __pthread_cond_wait_common (abstime=0x0, clockid=0, mutex=0x7fad30004678, cond=0x7fad300046a0) at pthread_cond_wait.c:508
#2  __pthread_cond_wait (cond=0x7fad300046a0, mutex=0x7fad30004678) at pthread_cond_wait.c:638
#3  0x00007fad348c93db in ?? () from /usr/lib/x86_64-linux-gnu/dri/nouveau_dri.so
#4  0x00007fad348c8feb in ?? () from /usr/lib/x86_64-linux-gnu/dri/nouveau_dri.so
#5  0x00007fad49ad7609 in start_thread (arg=<optimized out>) at pthread_create.c:477
#6  0x00007fad4aaec103 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 3 (Thread 0x7fad2b5af700 (LWP 21725)):
#0  futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x7fad300046c8) at ../sysdeps/nptl/futex-internal.h:183
#1  __pthread_cond_wait_common (abstime=0x0, clockid=0, mutex=0x7fad30004678, cond=0x7fad300046a0) at pthread_cond_wait.c:508
#2  __pthread_cond_wait (cond=0x7fad300046a0, mutex=0x7fad30004678) at pthread_cond_wait.c:638
#3  0x00007fad348c93db in ?? () from /usr/lib/x86_64-linux-gnu/dri/nouveau_dri.so
#4  0x00007fad348c8feb in ?? () from /usr/lib/x86_64-linux-gnu/dri/nouveau_dri.so
#5  0x00007fad49ad7609 in start_thread (arg=<optimized out>) at pthread_create.c:477
#6  0x00007fad4aaec103 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 2 (Thread 0x7fad2bdb0700 (LWP 21724)):
#0  futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x7fad300046c8) at ../sysdeps/nptl/futex-internal.h:183
#1  __pthread_cond_wait_common (abstime=0x0, clockid=0, mutex=0x7fad30004678, cond=0x7fad300046a0) at pthread_cond_wait.c:508
#2  __pthread_cond_wait (cond=0x7fad300046a0, mutex=0x7fad30004678) at pthread_cond_wait.c:638
#3  0x00007fad348c93db in ?? () from /usr/lib/x86_64-linux-gnu/dri/nouveau_dri.so
#4  0x00007fad348c8feb in ?? () from /usr/lib/x86_64-linux-gnu/dri/nouveau_dri.so
#5  0x00007fad49ad7609 in start_thread (arg=<optimized out>) at pthread_create.c:477
#6  0x00007fad4aaec103 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 1 (Thread 0x7fad378c1f00 (LWP 21721)):
[KCrash Handler]
#6  __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:50
#7  0x00007fad4a9ef859 in __GI_abort () at abort.c:79
#8  0x00007fad4a9ef729 in __assert_fail_base (fmt=0x7fad35dd4422 "%s%s%s:%u: %s%sZusicherung \302\273%s\302\253 nicht erf\303\274llt.\n%n", assertion=0x7fad34326068 "kref", file=0x7fad34326052 "../nouveau/pushbuf.c", line=723, function=<optimized out>) at assert.c:92
#9  0x00007fad4aa00f36 in __GI___assert_fail (assertion=assertion@entry=0x7fad34326068 "kref", file=file@entry=0x7fad34326052 "../nouveau/pushbuf.c", line=line@entry=723, function=function@entry=0x7fad343261a0 <__PRETTY_FUNCTION__.6636> "nouveau_pushbuf_data") at assert.c:101
#10 0x00007fad34323547 in nouveau_pushbuf_data (push=0x564aff370360, bo=0x564aff370420, offset=416332, length=552) at ../nouveau/pushbuf.c:723
#11 0x00007fad343234a7 in nouveau_pushbuf_data (push=push@entry=0x564aff370360, bo=bo@entry=0x0, offset=offset@entry=0, length=length@entry=0) at ../nouveau/pushbuf.c:715
#12 0x00007fad343235cc in pushbuf_submit (push=push@entry=0x564aff370360, chan=<optimized out>, chan=<optimized out>) at ../nouveau/pushbuf.c:326
#13 0x00007fad343239ef in pushbuf_flush (push=push@entry=0x564aff370360) at ../nouveau/pushbuf.c:401
#14 0x00007fad343245e4 in nouveau_pushbuf_kick (push=0x564aff370360, chan=<optimized out>) at ../nouveau/pushbuf.c:775
#15 0x00007fad34d7cdbc in ?? () from /usr/lib/x86_64-linux-gnu/dri/nouveau_dri.so
#16 0x00007fad34560e0b in ?? () from /usr/lib/x86_64-linux-gnu/dri/nouveau_dri.so
#17 0x00007fad34554def in ?? () from /usr/lib/x86_64-linux-gnu/dri/nouveau_dri.so
#18 0x00007fad35d69f07 in loader_dri3_swap_buffers_msc (draw=0x564affe50598, target_msc=0, divisor=0, remainder=0, flush_flags=<optimized out>, force_copy=<optimized out>) at ../src/loader/loader_dri3_helper.c:917
#19 0x00007fad372d0d6a in QGLXContext::swapBuffers (this=0x564affcf64b0, surface=0x564aff865af0) at qglxintegration.cpp:637
#20 0x00007fad4b4665d1 in QOpenGLContext::swapBuffers (this=0x564affd09720, surface=surface@entry=0x564aff85f810) at kernel/qopenglcontext.cpp:1112
#21 0x00007fad4b738947 in QPlatformBackingStore::composeAndFlush (this=this@entry=0x564aff864260, window=window@entry=0x564aff85f800, region=..., offset=..., textures=textures@entry=0x564b007f90a0, translucentBackground=translucentBackground@entry=false) at painting/qplatformbackingstore.cpp:463
#22 0x00007fad37186008 in QXcbBackingStore::composeAndFlush (translucentBackground=false, textures=0x564b007f90a0, offset=..., region=..., window=0x564aff85f800, this=0x564aff864260) at qxcbbackingstore.cpp:890
#23 QXcbBackingStore::composeAndFlush (this=0x564aff864260, window=0x564aff85f800, region=..., offset=..., textures=0x564b007f90a0, translucentBackground=<optimized out>) at qxcbbackingstore.cpp:881
#24 0x00007fad4ba67e84 in QWidgetBackingStore::qt_flush (widgetBackingStore=<optimized out>, widgetTextures=0x564b007f90a0, tlw=<optimized out>, backingStore=<optimized out>, region=..., widget=0x564aff85eec0) at kernel/qwidgetbackingstore.cpp:159
#25 QWidgetBackingStore::qt_flush (widget=0x564aff85eec0, region=..., backingStore=<optimized out>, tlw=<optimized out>, widgetTextures=<optimized out>, widgetBackingStore=<optimized out>) at kernel/qwidgetbackingstore.cpp:88
#26 0x00007fad4ba698fb in QWidgetBackingStore::flush (this=this@entry=0x564aff879e60, widget=widget@entry=0x0) at kernel/qwidgetbackingstore.cpp:1473
#27 0x00007fad4ba6ac11 in QWidgetBackingStore::endPaint (beginPaintInfo=<synthetic pointer>, backingStore=<optimized out>, cleaned=..., this=0x564aff879e60) at kernel/qwidgetbackingstore.cpp:365
#28 QWidgetBackingStore::doSync (this=<optimized out>) at kernel/qwidgetbackingstore.cpp:1431
#29 0x00007fad4ba6adc1 in QWidgetBackingStore::sync (this=0x564aff879e60) at kernel/qwidgetbackingstore.cpp:1209
#30 0x00007fad4ba83385 in QWidgetPrivate::syncBackingStore (this=0x564aff2ecc00) at kernel/qwidget.cpp:1949
#31 0x00007fad4ba9bcac in QWidget::event (this=this@entry=0x564aff464c60, event=event@entry=0x7face01830e0) at kernel/qwidget.cpp:9282
#32 0x00007fad4bbb0148 in QMainWindow::event (this=0x564aff464c60, event=0x7face01830e0) at widgets/qmainwindow.cpp:1339
#33 0x00007fad4c1599ab in KMainWindow::event(QEvent*) () from /usr/lib/x86_64-linux-gnu/libKF5XmlGui.so.5
#34 0x00007fad4c1a45bb in KXmlGuiWindow::event(QEvent*) () from /usr/lib/x86_64-linux-gnu/libKF5XmlGui.so.5
#35 0x00007fad4ba58a66 in QApplicationPrivate::notify_helper (this=this@entry=0x564aff27d9c0, receiver=receiver@entry=0x564aff464c60, e=e@entry=0x7face01830e0) at kernel/qapplication.cpp:3700
#36 0x00007fad4ba620f0 in QApplication::notify (this=0x7ffc6e696ef0, receiver=0x564aff464c60, e=0x7face01830e0) at kernel/qapplication.cpp:3446
#37 0x00007fad4b04093a in QCoreApplication::notifyInternal2 (receiver=0x564aff464c60, event=0x7face01830e0) at ../../include/QtCore/../../src/corelib/kernel/qobject.h:142
#38 0x00007fad4b0435b8 in QCoreApplicationPrivate::sendPostedEvents (receiver=0x0, event_type=0, data=0x564aff279260) at kernel/qcoreapplication.cpp:1825
#39 0x00007fad4b098f67 in postEventSourceDispatch (s=0x564aff2dc080) at kernel/qeventdispatcher_glib.cpp:276
#40 0x00007fad4913efbd in g_main_context_dispatch () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#41 0x00007fad4913f240 in ?? () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#42 0x00007fad4913f2e3 in g_main_context_iteration () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#43 0x00007fad4b098565 in QEventDispatcherGlib::processEvents (this=0x564aff2ebb90, flags=...) at kernel/qeventdispatcher_glib.cpp:422
#44 0x00007fad4b03f4db in QEventLoop::exec (this=this@entry=0x7ffc6e696dc0, flags=..., flags@entry=...) at ../../include/QtCore/../../src/corelib/global/qflags.h:140
#45 0x00007fad4b047246 in QCoreApplication::exec () at ../../include/QtCore/../../src/corelib/global/qflags.h:120
#46 0x0000564afe783cde in main (argc=<optimized out>, argv=<optimized out>) at ./src/main.cpp:229
[Inferior 1 (process 21721) detached]

Possible duplicates by query: bug 422433, bug 421576, bug 420864, bug 420414, bug 419798.

Reported using DrKonqi