Bug 358342

Application: plasmashell (5.5.3)

Qt Version: 5.5.1
Operating System: Linux 4.2.0-25-generic x86_64
Distribution: Ubuntu 15.10

-- Information about the crash:
- What I was doing when the application crashed:

Switching between tasks with the KDE "Task Manager." Happens maybe 10 times during a working day. Possibly something related to showing the preview tooltips.

The crash can be reproduced sometimes.

-- Backtrace:
Application: Plasma (plasmashell), signal: Segmentation fault
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[Current thread is 1 (Thread 0x7ff807d69800 (LWP 17946))]

Thread 12 (Thread 0x7ff7f3297700 (LWP 17949)):
#0  0x00007ff8024708dd in poll () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007ff80653ebd2 in ?? () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#2  0x00007ff80654074f in xcb_wait_for_event () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#3  0x00007ff7f53e07e9 in QXcbEventReader::run (this=0x1464550) at qxcbconnection.cpp:1229
#4  0x00007ff802b66a6e in QThreadPrivate::start (arg=0x1464550) at thread/qthread_unix.cpp:331
#5  0x00007ff801c526aa in start_thread (arg=0x7ff7f3297700) at pthread_create.c:333
#6  0x00007ff80247beed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 11 (Thread 0x7ff7e7ed7700 (LWP 17951)):
#0  0x00007ff8024708dd in poll () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007ff7ff2061ec in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007ff7ff2062fc in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007ff802d9e50b in QEventDispatcherGlib::processEvents (this=0x7ff7e00008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:420
#4  0x00007ff802d4550a in QEventLoop::exec (this=this@entry=0x7ff7e7ed6da0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#5  0x00007ff802b61ac4 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:503
#6  0x00007ff80540fc35 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#7  0x00007ff802b66a6e in QThreadPrivate::start (arg=0x16e6600) at thread/qthread_unix.cpp:331
#8  0x00007ff801c526aa in start_thread (arg=0x7ff7e7ed7700) at pthread_create.c:333
#9  0x00007ff80247beed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 10 (Thread 0x7ff7de0db700 (LWP 17956)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007ff7e55a6d33 in cnd_wait (mtx=0x15b69d8, cond=0x15b6a00) at ../../../../../../include/c11/threads_posix.h:154
#2  pipe_semaphore_wait (sema=0x15b69d8) at ../../../../../../src/gallium/auxiliary/os/os_thread.h:259
#3  thread_function (init_data=init_data@entry=0x15b6938) at ../../../../../../src/gallium/drivers/llvmpipe/lp_rast.c:779
#4  0x00007ff7e55a6b97 in impl_thrd_routine (p=<optimized out>) at ../../../../../../include/c11/threads_posix.h:87
#5  0x00007ff801c526aa in start_thread (arg=0x7ff7de0db700) at pthread_create.c:333
#6  0x00007ff80247beed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 9 (Thread 0x7ff7dd8da700 (LWP 17957)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007ff7e55a6d33 in cnd_wait (mtx=0x15b6b38, cond=0x15b6b60) at ../../../../../../include/c11/threads_posix.h:154
#2  pipe_semaphore_wait (sema=0x15b6b38) at ../../../../../../src/gallium/auxiliary/os/os_thread.h:259
#3  thread_function (init_data=init_data@entry=0x15b6a98) at ../../../../../../src/gallium/drivers/llvmpipe/lp_rast.c:779
#4  0x00007ff7e55a6b97 in impl_thrd_routine (p=<optimized out>) at ../../../../../../include/c11/threads_posix.h:87
#5  0x00007ff801c526aa in start_thread (arg=0x7ff7dd8da700) at pthread_create.c:333
#6  0x00007ff80247beed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 8 (Thread 0x7ff7dd0d9700 (LWP 17958)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007ff7e55a6d33 in cnd_wait (mtx=0x15b6c98, cond=0x15b6cc0) at ../../../../../../include/c11/threads_posix.h:154
#2  pipe_semaphore_wait (sema=0x15b6c98) at ../../../../../../src/gallium/auxiliary/os/os_thread.h:259
#3  thread_function (init_data=init_data@entry=0x15b6bf8) at ../../../../../../src/gallium/drivers/llvmpipe/lp_rast.c:779
#4  0x00007ff7e55a6b97 in impl_thrd_routine (p=<optimized out>) at ../../../../../../include/c11/threads_posix.h:87
#5  0x00007ff801c526aa in start_thread (arg=0x7ff7dd0d9700) at pthread_create.c:333
#6  0x00007ff80247beed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 7 (Thread 0x7ff7dc8d8700 (LWP 17959)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007ff7e55a6d33 in cnd_wait (mtx=0x15b6df8, cond=0x15b6e20) at ../../../../../../include/c11/threads_posix.h:154
#2  pipe_semaphore_wait (sema=0x15b6df8) at ../../../../../../src/gallium/auxiliary/os/os_thread.h:259
#3  thread_function (init_data=init_data@entry=0x15b6d58) at ../../../../../../src/gallium/drivers/llvmpipe/lp_rast.c:779
#4  0x00007ff7e55a6b97 in impl_thrd_routine (p=<optimized out>) at ../../../../../../include/c11/threads_posix.h:87
#5  0x00007ff801c526aa in start_thread (arg=0x7ff7dc8d8700) at pthread_create.c:333
#6  0x00007ff80247beed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 6 (Thread 0x7ff7d80a7700 (LWP 17960)):
#0  0x00007ff7ff24a869 in g_mutex_lock () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007ff7ff2061ae in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007ff7ff2062fc in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007ff802d9e50b in QEventDispatcherGlib::processEvents (this=0x7ff7d00008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:420
#4  0x00007ff802d4550a in QEventLoop::exec (this=this@entry=0x7ff7d80a6da0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#5  0x00007ff802b61ac4 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:503
#6  0x00007ff80540fc35 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#7  0x00007ff802b66a6e in QThreadPrivate::start (arg=0x18c69b0) at thread/qthread_unix.cpp:331
#8  0x00007ff801c526aa in start_thread (arg=0x7ff7d80a7700) at pthread_create.c:333
#9  0x00007ff80247beed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 5 (Thread 0x7ff7d61f5700 (LWP 17961)):
#0  0x00007ff7ff203267 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007ff7ff205b4a in g_main_context_check () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007ff7ff206190 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007ff7ff2062fc in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007ff802d9e50b in QEventDispatcherGlib::processEvents (this=0x7ff7c80008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:420
#5  0x00007ff802d4550a in QEventLoop::exec (this=this@entry=0x7ff7d61f4da0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#6  0x00007ff802b61ac4 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:503
#7  0x00007ff80540fc35 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#8  0x00007ff802b66a6e in QThreadPrivate::start (arg=0x19dd460) at thread/qthread_unix.cpp:331
#9  0x00007ff801c526aa in start_thread (arg=0x7ff7d61f5700) at pthread_create.c:333
#10 0x00007ff80247beed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 4 (Thread 0x7ff7d4887700 (LWP 17962)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007ff8077b8194 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#2  0x00007ff8077b81d9 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#3  0x00007ff801c526aa in start_thread (arg=0x7ff7d4887700) at pthread_create.c:333
#4  0x00007ff80247beed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 3 (Thread 0x7ff7cd44e700 (LWP 17963)):
#0  0x00007ff7ff206074 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007ff7ff2062fc in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007ff802d9e50b in QEventDispatcherGlib::processEvents (this=0x7ff7440008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:420
#3  0x00007ff802d4550a in QEventLoop::exec (this=this@entry=0x7ff7cd44dd50, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#4  0x00007ff802b61ac4 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:503
#5  0x00007ff805d982a6 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#6  0x00007ff802b66a6e in QThreadPrivate::start (arg=0x1cbf1d0) at thread/qthread_unix.cpp:331
#7  0x00007ff801c526aa in start_thread (arg=0x7ff7cd44e700) at pthread_create.c:333
#8  0x00007ff80247beed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 2 (Thread 0x7ff73be83700 (LWP 17967)):
#0  0x00007ff8024708dd in poll () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007ff7ff2061ec in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007ff7ff2062fc in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007ff802d9e50b in QEventDispatcherGlib::processEvents (this=0x7ff7340008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:420
#4  0x00007ff802d4550a in QEventLoop::exec (this=this@entry=0x7ff73be82d80, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#5  0x00007ff802b61ac4 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:503
#6  0x00007ff73ce808f7 in KCupsConnection::run() () from /usr/lib/x86_64-linux-gnu/libkcupslib.so
#7  0x00007ff802b66a6e in QThreadPrivate::start (arg=0x40d7850) at thread/qthread_unix.cpp:331
#8  0x00007ff801c526aa in start_thread (arg=0x7ff73be83700) at pthread_create.c:333
#9  0x00007ff80247beed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 1 (Thread 0x7ff807d69800 (LWP 17946)):
[KCrash Handler]
#6  __memmove_avx_unaligned () at ../sysdeps/x86_64/multiarch/memcpy-avx-unaligned.S:245
#7  0x00007ff7e527f49d in memmove (__len=119958464, __src=<optimized out>, __dest=<optimized out>) at /usr/include/x86_64-linux-gnu/bits/string3.h:59
#8  drisw_update_tex_buffer (drawable=<optimized out>, ctx=<optimized out>, res=<optimized out>) at ../../../../../../src/gallium/state_trackers/dri/drisw.c:321
#9  0x00007ff7e527df05 in dri_set_tex_buffer2 (pDRICtx=<optimized out>, target=3553, format=8409, dPriv=<optimized out>) at ../../../../../../src/gallium/state_trackers/dri/dri_drawable.c:245
#10 0x00007ff7e6c47ccf in Plasma::WindowThumbnail::bindGLXTexture (this=this@entry=0x39f56c0) at ../../../../src/declarativeimports/core/windowthumbnail.cpp:447
#11 0x00007ff7e6c48f04 in Plasma::WindowThumbnail::windowToTextureGLX (this=this@entry=0x39f56c0, textureNode=textureNode@entry=0x588be90) at ../../../../src/declarativeimports/core/windowthumbnail.cpp:282
#12 0x00007ff7e6c498c3 in Plasma::WindowThumbnail::windowToTexture (this=0x39f56c0, textureNode=0x588be90) at ../../../../src/declarativeimports/core/windowthumbnail.cpp:394
#13 0x00007ff7e6c49de4 in Plasma::WindowThumbnail::updatePaintNode (this=0x39f56c0, oldNode=<optimized out>, updatePaintNodeData=<optimized out>) at ../../../../src/declarativeimports/core/windowthumbnail.cpp:199
#14 0x00007ff805e35de8 in QQuickWindowPrivate::updateDirtyNode(QQuickItem*) () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#15 0x00007ff805e3666b in QQuickWindowPrivate::updateDirtyNodes() () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#16 0x00007ff805e367e0 in QQuickWindowPrivate::syncSceneGraph() () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#17 0x00007ff805e0554c in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#18 0x00007ff805e066c1 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#19 0x00007ff80384c9dc in QApplicationPrivate::notify_helper (this=this@entry=0x144d690, receiver=receiver@entry=0x1598630, e=e@entry=0x7fff6bb1f4c0) at kernel/qapplication.cpp:3716
#20 0x00007ff803851ea6 in QApplication::notify (this=0x7fff6bb1f860, receiver=0x1598630, e=0x7fff6bb1f4c0) at kernel/qapplication.cpp:3499
#21 0x00007ff802d47d7b in QCoreApplication::notifyInternal (this=0x7fff6bb1f860, receiver=0x1598630, event=event@entry=0x7fff6bb1f4c0) at kernel/qcoreapplication.cpp:965
#22 0x00007ff802d9d30d in QCoreApplication::sendEvent (event=0x7fff6bb1f4c0, receiver=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:224
#23 QTimerInfoList::activateTimers (this=0x14907b0) at kernel/qtimerinfo_unix.cpp:637
#24 0x00007ff802d9d811 in timerSourceDispatch (source=<optimized out>) at kernel/qeventdispatcher_glib.cpp:177
#25 0x00007ff7ff205ff7 in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#26 0x00007ff7ff206250 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#27 0x00007ff7ff2062fc in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#28 0x00007ff802d9e4ef in QEventDispatcherGlib::processEvents (this=0x14867d0, flags=...) at kernel/qeventdispatcher_glib.cpp:418
#29 0x00007ff802d4550a in QEventLoop::exec (this=this@entry=0x7fff6bb1f700, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#30 0x00007ff802d4d5ec in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1229
#31 0x00007ff803081d1c in QGuiApplication::exec () at kernel/qguiapplication.cpp:1530
#32 0x00007ff803848e15 in QApplication::exec () at kernel/qapplication.cpp:2976
#33 0x000000000043258a in main (argc=4, argv=<optimized out>) at ../../shell/main.cpp:179

Reported using DrKonqi