Application: dragon (17.08.3)

Qt Version: 5.11.3
Frameworks Version: 5.54.0
Operating System: Linux 4.19.0-5-amd64 x86_64
Distribution: Debian GNU/Linux 10 (buster)

-- Information about the crash:
This happens to me nearly every time playing MP4 and WebM videos with Dragon and closing the window. However, it doesn't occur if I pause the video first. The file size doesn't seem to make a difference, even a 9 MB video can cause the crash also.

The crash can be reproduced every time.

-- Backtrace:
Application: Dragon Player (dragon), signal: Aborted
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[Current thread is 1 (Thread 0x7fb5a62126c0 (LWP 9202))]

Thread 4 (Thread 0x7fb57ea29700 (LWP 9207)):
#0  0x00007fb5aa45900c in futex_wait_cancelable (private=0, expected=0, futex_word=0x557a4e2de628) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  0x00007fb5aa45900c in __pthread_cond_wait_common (abstime=0x0, mutex=0x557a4e2de5d8, cond=0x557a4e2de600) at pthread_cond_wait.c:502
#2  0x00007fb5aa45900c in __pthread_cond_wait (cond=0x557a4e2de600, mutex=0x557a4e2de5d8) at pthread_cond_wait.c:655
#3  0x00007fb57eff1e03 in cnd_wait (mtx=0x557a4e2de5d8, cond=0x557a4e2de600) at ../src/../include/c11/threads_posix.h:155
#4  0x00007fb57eff1e03 in util_queue_thread_func (input=input@entry=0x557a4e39f740) at ../src/util/u_queue.c:270
#5  0x00007fb57eff1b57 in impl_thrd_routine (p=<optimized out>) at ../src/../include/c11/threads_posix.h:87
#6  0x00007fb5aa452fa3 in start_thread (arg=<optimized out>) at pthread_create.c:486
#7  0x00007fb5aadb44cf in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 3 (Thread 0x7fb59f929700 (LWP 9204)):
#0  0x00007fb5a97a2e84 in g_mutex_unlock (mutex=0x7fb598000bf0) at ../../../glib/gthread-posix.c:1355
#1  0x00007fb5a9758fed in g_main_context_iterate (context=context@entry=0x7fb598000bf0, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at ../../../glib/gmain.c:3868
#2  0x00007fb5a975925c in g_main_context_iteration (context=0x7fb598000bf0, may_block=may_block@entry=1) at ../../../glib/gmain.c:3981
#3  0x00007fb5ab43e87b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x7fb598000b20, flags=...) at kernel/qeventdispatcher_glib.cpp:424
#4  0x00007fb5ab3ec27b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7fb59f928d30, flags=..., flags@entry=...) at ../../include/QtCore/../../src/corelib/global/qflags.h:140
#5  0x00007fb5ab23bec6 in QThread::exec() (this=<optimized out>) at ../../include/QtCore/../../src/corelib/global/qflags.h:120
#6  0x00007fb5ab694545 in  () at /lib/x86_64-linux-gnu/libQt5DBus.so.5
#7  0x00007fb5ab245aa7 in QThreadPrivate::start(void*) (arg=0x7fb5ab714d60) at thread/qthread_unix.cpp:367
#8  0x00007fb5aa452fa3 in start_thread (arg=<optimized out>) at pthread_create.c:486
#9  0x00007fb5aadb44cf in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 2 (Thread 0x7fb5a5454700 (LWP 9203)):
#0  0x00007fb5aada9819 in __GI___poll (fds=0x7fb5a5453c78, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007fb5aa413cf7 in  () at /lib/x86_64-linux-gnu/libxcb.so.1
#2  0x00007fb5aa41591a in xcb_wait_for_event () at /lib/x86_64-linux-gnu/libxcb.so.1
#3  0x00007fb5a5dc6d79 in QXcbEventReader::run() (this=0x557a4e0dec00) at qxcbconnection.h:409
#4  0x00007fb5ab245aa7 in QThreadPrivate::start(void*) (arg=0x557a4e0dec00) at thread/qthread_unix.cpp:367
#5  0x00007fb5aa452fa3 in start_thread (arg=<optimized out>) at pthread_create.c:486
#6  0x00007fb5aadb44cf in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 1 (Thread 0x7fb5a62126c0 (LWP 9202)):
[KCrash Handler]
#6  0x00007fb5aacf27bb in __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:50
#7  0x00007fb5aacdd535 in __GI_abort () at abort.c:79
#8  0x00007fb5a9168e58 in flush (f=<optimized out>) at pulsecore/fdsem.c:170
#9  0x00007fb5a9168e58 in flush (f=0x557a4e4ef6e0) at pulsecore/fdsem.c:139
#10 0x00007fb5a916982f in pa_fdsem_after_poll (f=0x557a4e4ef6e0) at pulsecore/fdsem.c:314
#11 0x00007fb5a91813ed in semread_cb (m=<optimized out>, e=<optimized out>, fd=<optimized out>, events=<optimized out>, userdata=0x557a4e94cd80) at pulsecore/srbchannel.c:209
#12 0x00007fb5aa1aa3d6 in dispatch_func (source=0x557a4e2f88c0, callback=<optimized out>, userdata=<optimized out>) at pulse/glib-mainloop.c:203
#13 0x00007fb5a9758f2e in g_main_dispatch (context=0x7fb5a0004ff0) at ../../../glib/gmain.c:3182
#14 0x00007fb5a9758f2e in g_main_context_dispatch (context=context@entry=0x7fb5a0004ff0) at ../../../glib/gmain.c:3847
#15 0x00007fb5a97591c8 in g_main_context_iterate (context=context@entry=0x7fb5a0004ff0, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at ../../../glib/gmain.c:3920
#16 0x00007fb5a975925c in g_main_context_iteration (context=0x7fb5a0004ff0, may_block=may_block@entry=1) at ../../../glib/gmain.c:3981
#17 0x00007fb5ab43e863 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x557a4e12f970, flags=...) at kernel/qeventdispatcher_glib.cpp:422
#18 0x00007fb5a5e5d3e1 in QPAEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x557a4e12f970, flags=...) at qeventdispatcher_glib.cpp:69
#19 0x00007fb5ab3ec27b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7ffc90280ba0, flags=..., flags@entry=...) at ../../include/QtCore/../../src/corelib/global/qflags.h:140
#20 0x00007fb5ab3f4262 in QCoreApplication::exec() () at ../../include/QtCore/../../src/corelib/global/qflags.h:120
#21 0x0000557a4d88b6be in main(int, char**) (argc=<optimized out>, argv=<optimized out>) at ./src/app/main.cpp:91
[Inferior 1 (process 9202) detached]

The reporter indicates this bug may be a duplicate of or related to bug 382681.

Possible duplicates by query: bug 385688, bug 383184.

Reported using DrKonqi