[Bug 103234] KWin crashed when Alt+Tab-ing through open windows

[bugzilla-daemon@freedesktop.org]

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https://bugs.freedesktop.org/show_bug.cgi?id=103234

--- Comment #3 from Dennis Schridde <devurandom@gmx.net> ---
It just happened again:

Application: KWin (kwin_x11), signal: Segmentation fault
Using host libthread_db library "/lib64/libthread_db.so.1".
[Current thread is 1 (Thread 0x7fc355251d00 (LWP 3241))]

Thread 13 (Thread 0x7fc31350c700 (LWP 30580)):
#0  0x00007fc34e829466 in pthread_cond_wait () from /lib64/libpthread.so.0
#1  0x00007fc32df9b7f3 in cnd_wait (mtx=0x144db48, cond=0x144db70) at
/var/tmp/portage/media-libs/mesa-17.2.2/work/mesa-17.2.2/include/c11/threads_posix.h:159
#2  util_queue_thread_func (input=input@entry=0x13e9bf0) at
/var/tmp/portage/media-libs/mesa-17.2.2/work/mesa-17.2.2/src/util/u_queue.c:158
#3  0x00007fc32df9b717 in impl_thrd_routine (p=<optimized out>) at
/var/tmp/portage/media-libs/mesa-17.2.2/work/mesa-17.2.2/include/c11/threads_posix.h:87
#4  0x00007fc34e822617 in start_thread () from /lib64/libpthread.so.0
#5  0x00007fc354d5960f in clone () from /lib64/libc.so.6

Thread 12 (Thread 0x7fc312d0b700 (LWP 3408)):
#0  0x00007fc34e829466 in pthread_cond_wait () from /lib64/libpthread.so.0
#1  0x00007fc351dbe634 in ?? () from /usr/lib64/libQt5Script.so.5
#2  0x00007fc351dbe679 in ?? () from /usr/lib64/libQt5Script.so.5
#3  0x00007fc34e822617 in start_thread () from /lib64/libpthread.so.0
#4  0x00007fc354d5960f in clone () from /lib64/libc.so.6

Thread 11 (Thread 0x7fc313d0d700 (LWP 3380)):
#0  0x00007fc34e829466 in pthread_cond_wait () from /lib64/libpthread.so.0
#1  0x00007fc32df9b7f3 in cnd_wait (mtx=0xf50528, cond=0xf50550) at
/var/tmp/portage/media-libs/mesa-17.2.2/work/mesa-17.2.2/include/c11/threads_posix.h:159
#2  util_queue_thread_func (input=input@entry=0xe39db0) at
/var/tmp/portage/media-libs/mesa-17.2.2/work/mesa-17.2.2/src/util/u_queue.c:158
#3  0x00007fc32df9b717 in impl_thrd_routine (p=<optimized out>) at
/var/tmp/portage/media-libs/mesa-17.2.2/work/mesa-17.2.2/include/c11/threads_posix.h:87
#4  0x00007fc34e822617 in start_thread () from /lib64/libpthread.so.0
#5  0x00007fc354d5960f in clone () from /lib64/libc.so.6

Thread 10 (Thread 0x7fc31450e700 (LWP 3377)):
#0  0x00007fc34e829466 in pthread_cond_wait () from /lib64/libpthread.so.0
#1  0x00007fc32df9b7f3 in cnd_wait (mtx=0xdf6b80, cond=0xdf6ba8) at
/var/tmp/portage/media-libs/mesa-17.2.2/work/mesa-17.2.2/include/c11/threads_posix.h:159
#2  util_queue_thread_func (input=input@entry=0xe45f40) at
/var/tmp/portage/media-libs/mesa-17.2.2/work/mesa-17.2.2/src/util/u_queue.c:158
#3  0x00007fc32df9b717 in impl_thrd_routine (p=<optimized out>) at
/var/tmp/portage/media-libs/mesa-17.2.2/work/mesa-17.2.2/include/c11/threads_posix.h:87
#4  0x00007fc34e822617 in start_thread () from /lib64/libpthread.so.0
#5  0x00007fc354d5960f in clone () from /lib64/libc.so.6

Thread 9 (Thread 0x7fc314d0f700 (LWP 3376)):
#0  0x00007fc34e829466 in pthread_cond_wait () from /lib64/libpthread.so.0
#1  0x00007fc32df9b7f3 in cnd_wait (mtx=0xdf6b80, cond=0xdf6ba8) at
/var/tmp/portage/media-libs/mesa-17.2.2/work/mesa-17.2.2/include/c11/threads_posix.h:159
#2  util_queue_thread_func (input=input@entry=0xe45f00) at
/var/tmp/portage/media-libs/mesa-17.2.2/work/mesa-17.2.2/src/util/u_queue.c:158
#3  0x00007fc32df9b717 in impl_thrd_routine (p=<optimized out>) at
/var/tmp/portage/media-libs/mesa-17.2.2/work/mesa-17.2.2/include/c11/threads_posix.h:87
#4  0x00007fc34e822617 in start_thread () from /lib64/libpthread.so.0
#5  0x00007fc354d5960f in clone () from /lib64/libc.so.6

Thread 8 (Thread 0x7fc315510700 (LWP 3375)):
#0  0x00007fc34e829466 in pthread_cond_wait () from /lib64/libpthread.so.0
#1  0x00007fc32df9b7f3 in cnd_wait (mtx=0xdf6a98, cond=0xdf6ac0) at
/var/tmp/portage/media-libs/mesa-17.2.2/work/mesa-17.2.2/include/c11/threads_posix.h:159
#2  util_queue_thread_func (input=input@entry=0xe52840) at
/var/tmp/portage/media-libs/mesa-17.2.2/work/mesa-17.2.2/src/util/u_queue.c:158
#3  0x00007fc32df9b717 in impl_thrd_routine (p=<optimized out>) at
/var/tmp/portage/media-libs/mesa-17.2.2/work/mesa-17.2.2/include/c11/threads_posix.h:87
#4  0x00007fc34e822617 in start_thread () from /lib64/libpthread.so.0
#5  0x00007fc354d5960f in clone () from /lib64/libc.so.6

Thread 7 (Thread 0x7fc315d11700 (LWP 3374)):
#0  0x00007fc34e829466 in pthread_cond_wait () from /lib64/libpthread.so.0
#1  0x00007fc32df9b7f3 in cnd_wait (mtx=0xdf6a98, cond=0xdf6ac0) at
/var/tmp/portage/media-libs/mesa-17.2.2/work/mesa-17.2.2/include/c11/threads_posix.h:159
#2  util_queue_thread_func (input=input@entry=0xe0a120) at
/var/tmp/portage/media-libs/mesa-17.2.2/work/mesa-17.2.2/src/util/u_queue.c:158
#3  0x00007fc32df9b717 in impl_thrd_routine (p=<optimized out>) at
/var/tmp/portage/media-libs/mesa-17.2.2/work/mesa-17.2.2/include/c11/threads_posix.h:87
#4  0x00007fc34e822617 in start_thread () from /lib64/libpthread.so.0
#5  0x00007fc354d5960f in clone () from /lib64/libc.so.6

Thread 6 (Thread 0x7fc316512700 (LWP 3373)):
#0  0x00007fc34e829466 in pthread_cond_wait () from /lib64/libpthread.so.0
#1  0x00007fc32df9b7f3 in cnd_wait (mtx=0xdf6a98, cond=0xdf6ac0) at
/var/tmp/portage/media-libs/mesa-17.2.2/work/mesa-17.2.2/include/c11/threads_posix.h:159
#2  util_queue_thread_func (input=input@entry=0xe45d60) at
/var/tmp/portage/media-libs/mesa-17.2.2/work/mesa-17.2.2/src/util/u_queue.c:158
#3  0x00007fc32df9b717 in impl_thrd_routine (p=<optimized out>) at
/var/tmp/portage/media-libs/mesa-17.2.2/work/mesa-17.2.2/include/c11/threads_posix.h:87
#4  0x00007fc34e822617 in start_thread () from /lib64/libpthread.so.0
#5  0x00007fc354d5960f in clone () from /lib64/libc.so.6

Thread 5 (Thread 0x7fc316f19700 (LWP 3372)):
#0  0x00007fc34e829466 in pthread_cond_wait () from /lib64/libpthread.so.0
#1  0x00007fc32df9b7f3 in cnd_wait (mtx=0xe45de0, cond=0xe45e08) at
/var/tmp/portage/media-libs/mesa-17.2.2/work/mesa-17.2.2/include/c11/threads_posix.h:159
#2  util_queue_thread_func (input=input@entry=0xd4c050) at
/var/tmp/portage/media-libs/mesa-17.2.2/work/mesa-17.2.2/src/util/u_queue.c:158
#3  0x00007fc32df9b717 in impl_thrd_routine (p=<optimized out>) at
/var/tmp/portage/media-libs/mesa-17.2.2/work/mesa-17.2.2/include/c11/threads_posix.h:87
#4  0x00007fc34e822617 in start_thread () from /lib64/libpthread.so.0
#5  0x00007fc354d5960f in clone () from /lib64/libc.so.6

Thread 4 (Thread 0x7fc31771a700 (LWP 3371)):
#0  0x00007fc34e829466 in pthread_cond_wait () from /lib64/libpthread.so.0
#1  0x00007fc32df9b7f3 in cnd_wait (mtx=0xdf3d38, cond=0xdf3d60) at
/var/tmp/portage/media-libs/mesa-17.2.2/work/mesa-17.2.2/include/c11/threads_posix.h:159
#2  util_queue_thread_func (input=input@entry=0xd4c390) at
/var/tmp/portage/media-libs/mesa-17.2.2/work/mesa-17.2.2/src/util/u_queue.c:158
#3  0x00007fc32df9b717 in impl_thrd_routine (p=<optimized out>) at
/var/tmp/portage/media-libs/mesa-17.2.2/work/mesa-17.2.2/include/c11/threads_posix.h:87
#4  0x00007fc34e822617 in start_thread () from /lib64/libpthread.so.0
#5  0x00007fc354d5960f in clone () from /lib64/libc.so.6

Thread 3 (Thread 0x7fc32ffff700 (LWP 3341)):
#0  0x00007fc354d4e5c3 in ppoll () from /lib64/libc.so.6
#1  0x00007fc352c9c419 in ppoll (__ss=<optimized out>, __timeout=<optimized
out>, __nfds=<optimized out>, __fds=<optimized out>) at
/usr/include/bits/poll2.h:77
#2  qt_ppoll (timeout_ts=0x0, nfds=1, fds=0x7fc324000ac8) at
kernel/qcore_unix.cpp:81
#3  qt_safe_poll (fds=0x7fc324000ac8, nfds=nfds@entry=1,
timeout_ts=timeout_ts@entry=0x0) at kernel/qcore_unix.cpp:102
#4  0x00007fc352c9d663 in QEventDispatcherUNIX::processEvents (this=<optimized
out>, flags=...) at kernel/qeventdispatcher_unix.cpp:500
#5  0x00007fc352c5066a in QEventLoop::exec (this=this@entry=0x7fc32fffed50,
flags=..., flags@entry=...) at kernel/qeventloop.cpp:212
#6  0x00007fc352ab43bb in QThread::exec (this=this@entry=0xde0aa0) at
thread/qthread.cpp:515
#7  0x00007fc34d6f3675 in QQmlThreadPrivate::run (this=0xde0aa0) at
qml/ftw/qqmlthread.cpp:147
#8  0x00007fc352ab85e0 in QThreadPrivate::start (arg=0xde0aa0) at
thread/qthread_unix.cpp:368
#9  0x00007fc34e822617 in start_thread () from /lib64/libpthread.so.0
#10 0x00007fc354d5960f in clone () from /lib64/libc.so.6

Thread 2 (Thread 0x7fc337102700 (LWP 3277)):
#0  0x00007fc354d67b92 in __libc_disable_asynccancel () from /lib64/libc.so.6
#1  0x00007fc354d4e5d6 in ppoll () from /lib64/libc.so.6
#2  0x00007fc352c9c419 in ppoll (__ss=<optimized out>, __timeout=<optimized
out>, __nfds=<optimized out>, __fds=<optimized out>) at
/usr/include/bits/poll2.h:77
#3  qt_ppoll (timeout_ts=0x0, nfds=1, fds=0x7fc33000ab98) at
kernel/qcore_unix.cpp:81
#4  qt_safe_poll (fds=0x7fc33000ab98, nfds=nfds@entry=1,
timeout_ts=timeout_ts@entry=0x0) at kernel/qcore_unix.cpp:102
#5  0x00007fc352c9d663 in QEventDispatcherUNIX::processEvents (this=<optimized
out>, flags=...) at kernel/qeventdispatcher_unix.cpp:500
#6  0x00007fc352c5066a in QEventLoop::exec (this=this@entry=0x7fc337101d40,
flags=..., flags@entry=...) at kernel/qeventloop.cpp:212
#7  0x00007fc352ab43bb in QThread::exec (this=this@entry=0x7fc3553b4da0
<(anonymous namespace)::Q_QGS__q_manager::innerFunction()::holder>) at
thread/qthread.cpp:515
#8  0x00007fc3553406b5 in QDBusConnectionManager::run (this=0x7fc3553b4da0
<(anonymous namespace)::Q_QGS__q_manager::innerFunction()::holder>) at
qdbusconnection.cpp:178
#9  0x00007fc352ab85e0 in QThreadPrivate::start (arg=0x7fc3553b4da0 <(anonymous
namespace)::Q_QGS__q_manager::innerFunction()::holder>) at
thread/qthread_unix.cpp:368
#10 0x00007fc34e822617 in start_thread () from /lib64/libpthread.so.0
#11 0x00007fc354d5960f in clone () from /lib64/libc.so.6

Thread 1 (Thread 0x7fc355251d00 (LWP 3241)):
[KCrash Handler]
#6  si_draw_vbo (ctx=0x1413780, info=0x14503f8) at
/var/tmp/portage/media-libs/mesa-17.2.2/work/mesa-17.2.2/src/gallium/drivers/radeonsi/si_state_draw.c:1305
#7  0x00007fc32e0b8863 in tc_call_draw_vbo (pipe=<optimized out>,
payload=0x14503f8) at
/var/tmp/portage/media-libs/mesa-17.2.2/work/mesa-17.2.2/src/gallium/auxiliary/util/u_threaded_context.c:1814
#8  0x00007fc32e0b69b0 in tc_batch_execute (thread_index=0, job=0x1450170) at
/var/tmp/portage/media-libs/mesa-17.2.2/work/mesa-17.2.2/src/gallium/auxiliary/util/u_threaded_context.c:94
#9  _tc_sync (tc=0x144d770, func=<optimized out>, info=<optimized out>) at
/var/tmp/portage/media-libs/mesa-17.2.2/work/mesa-17.2.2/src/gallium/auxiliary/util/u_threaded_context.c:185
#10 0x00007fc32e0b6e58 in tc_flush (_pipe=<optimized out>,
fence=0x7ffe88493950, flags=1) at
/var/tmp/portage/media-libs/mesa-17.2.2/work/mesa-17.2.2/src/gallium/auxiliary/util/u_threaded_context.c:1797
#11 0x00007fc32dee0bfe in st_context_flush (stctxi=0x146cda0, flags=3,
fence=0x7ffe88493950) at
/var/tmp/portage/media-libs/mesa-17.2.2/work/mesa-17.2.2/src/mesa/state_tracker/st_manager.c:635
#12 0x00007fc32e01f427 in dri_flush (cPriv=<optimized out>, dPriv=<optimized
out>, flags=<optimized out>, reason=<optimized out>) at
/var/tmp/portage/media-libs/mesa-17.2.2/work/mesa-17.2.2/src/gallium/state_trackers/dri/dri_drawable.c:550
#13 0x00007fc34bc989ef in loader_dri3_swap_buffers_msc (draw=0x13ea708,
target_msc=0, divisor=0, remainder=0, flush_flags=3, force_copy=<optimized
out>) at
/var/tmp/portage/media-libs/mesa-17.2.2/work/mesa-17.2.2/src/loader/loader_dri3_helper.c:643
#14 0x00007fc3554345fa in QGLXContext::swapBuffers (this=0x138d910,
surface=0x14775d0) at qglxintegration.cpp:545
#15 0x00007fc352fd120d in QOpenGLContext::swapBuffers (this=0x13c1bb0,
surface=<optimized out>) at kernel/qopenglcontext.cpp:1107
#16 0x00007fc34dbd312e in QSGGuiThreadRenderLoop::renderWindow (this=0x12092f0,
window=<optimized out>) at scenegraph/qsgrenderloop.cpp:445
#17 0x00007fc34dc45796 in QQuickWindow::event (this=this@entry=0x11d0440,
e=e@entry=0x7ffe88493f20) at items/qquickwindow.cpp:1587
#18 0x00007fc276db2d0b in PlasmaQuick::Dialog::event (this=0x11d0440,
event=0x7ffe88493f20) at
/var/tmp/portage/kde-frameworks/plasma-5.39.0/work/plasma-framework-5.39.0/src/plasmaquick/dialog.cpp:1171
#19 0x00007fc35349cf4c in QApplicationPrivate::notify_helper (this=<optimized
out>, receiver=0x11d0440, e=0x7ffe88493f20) at kernel/qapplication.cpp:3722
#20 0x00007fc3534a4620 in QApplication::notify (this=0x7ffe88494610,
receiver=0x11d0440, e=0x7ffe88493f20) at kernel/qapplication.cpp:3481
#21 0x00007fc352c51891 in QCoreApplication::notifyInternal2
(receiver=receiver@entry=0x11d0440, event=event@entry=0x7ffe88493f20) at
kernel/qcoreapplication.cpp:1018
#22 0x00007fc352fa9986 in QCoreApplication::sendEvent (event=0x7ffe88493f20,
receiver=<optimized out>) at
../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:233
#23 QWindowPrivate::deliverUpdateRequest (this=this@entry=0x11d08b0) at
kernel/qwindow.cpp:2302
#24 0x00007fc352fa9e99 in QWindow::event (this=this@entry=0x11d0440,
ev=ev@entry=0x7ffe88494390) at kernel/qwindow.cpp:2273
#25 0x00007fc34dc45735 in QQuickWindow::event (this=this@entry=0x11d0440,
e=e@entry=0x7ffe88494390) at items/qquickwindow.cpp:1606
#26 0x00007fc276db2d0b in PlasmaQuick::Dialog::event (this=0x11d0440,
event=0x7ffe88494390) at
/var/tmp/portage/kde-frameworks/plasma-5.39.0/work/plasma-framework-5.39.0/src/plasmaquick/dialog.cpp:1171
#27 0x00007fc35349cf4c in QApplicationPrivate::notify_helper (this=<optimized
out>, receiver=0x11d0440, e=0x7ffe88494390) at kernel/qapplication.cpp:3722
#28 0x00007fc3534a4620 in QApplication::notify (this=0x7ffe88494610,
receiver=0x11d0440, e=0x7ffe88494390) at kernel/qapplication.cpp:3481
#29 0x00007fc352c51891 in QCoreApplication::notifyInternal2
(receiver=0x11d0440, event=event@entry=0x7ffe88494390) at
kernel/qcoreapplication.cpp:1018
#30 0x00007fc352c9f44b in QCoreApplication::sendEvent (event=0x7ffe88494390,
receiver=<optimized out>) at
../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:233
#31 QTimerInfoList::activateTimers (this=this@entry=0xb4e700) at
kernel/qtimerinfo_unix.cpp:643
#32 0x00007fc352c9c844 in QEventDispatcherUNIXPrivate::activateTimers
(this=this@entry=0xb4e660) at kernel/qeventdispatcher_unix.cpp:249
#33 0x00007fc352c9d808 in QEventDispatcherUNIX::processEvents (this=<optimized
out>, flags=...) at kernel/qeventdispatcher_unix.cpp:514
#34 0x00007fc33da0b135 in QUnixEventDispatcherQPA::processEvents
(this=<optimized out>, flags=...) at qunixeventdispatcher.cpp:68
#35 0x00007fc352c5066a in QEventLoop::exec (this=this@entry=0x7ffe88494520,
flags=..., flags@entry=...) at kernel/qeventloop.cpp:212
#36 0x00007fc352c588fc in QCoreApplication::exec () at
kernel/qcoreapplication.cpp:1291
#37 0x00007fc352f959ec in QGuiApplication::exec () at
kernel/qguiapplication.cpp:1679
#38 0x00007fc35349cea5 in QApplication::exec () at kernel/qapplication.cpp:2910
#39 0x00007fc35502408a in kdemain (argc=<optimized out>, argv=0x7ffe884947a8)
at /var/tmp/portage/kde-plasma/kwin-5.11.0/work/kwin-5.11.0/main_x11.cpp:466
#40 0x00007fc354c835b1 in __libc_start_main () from /lib64/libc.so.6
#41 0x00000000004006ea in _start ()

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