Application: plasma-desktop (4.11.8)
KDE Platform Version: 4.12.3
Qt Version: 4.8.5
Operating System: Linux 3.13.9-200.fc20.x86_64 x86_64
Distribution (Platform): Fedora RPMs

-- Information about the crash:
I've experienced three crashes with the attached backtrace while running gwenview under valgrind (i.e. running "valgrind gwenview" and waiting for gwenview to start caused plasma-desktop to crash).

Given the icon cache, maybe there is a race condition in the icon cache that is triggered by gwenview trying to concurrently use it while running slowly due to valgrind?

Possibly related: gwenview is crashing in liblcms2 while viewing https://raw.githubusercontent.com/Slicer/Slicer/master/Applications/SlicerApp/Resources/Images/SlicerSplashScreen.png. There is something visibly wrong with the decoding of this file on my system in its current state (Fedora 20 with all updates as of 2014-04-15).

The crash can be reproduced sometimes.

-- Backtrace:
Application: Plasma Desktop Shell (plasma-desktop), signal: Illegal instruction
Using host libthread_db library "/lib64/libthread_db.so.1".
81	T_PSEUDO (SYSCALL_SYMBOL, SYSCALL_NAME, SYSCALL_NARGS)
[Current thread is 1 (Thread 0x7f6647d7a8c0 (LWP 20987))]

Thread 3 (Thread 0x7f662d9d1700 (LWP 20988)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x000000388438f09b in QTWTF::TCMalloc_PageHeap::scavengerThread (this=0x388468df00 <QTWTF::pageheap_memory>) at ../3rdparty/javascriptcore/JavaScriptCore/wtf/FastMalloc.cpp:2359
#2  0x000000388438f0d9 in QTWTF::TCMalloc_PageHeap::runScavengerThread (context=<optimized out>) at ../3rdparty/javascriptcore/JavaScriptCore/wtf/FastMalloc.cpp:1464
#3  0x0000003866e07f33 in start_thread (arg=0x7f662d9d1700) at pthread_create.c:309
#4  0x00000038662f4ded in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111

Thread 2 (Thread 0x7f65a913e700 (LWP 20989)):
#0  0x00000038662ea9dd in poll () at ../sysdeps/unix/syscall-template.S:81
#1  0x000000386a6495b4 in g_main_context_poll (priority=2147483647, n_fds=1, fds=0x7f65a4002bb0, timeout=-1, context=0x7f65a40009a0) at gmain.c:4007
#2  g_main_context_iterate (context=context@entry=0x7f65a40009a0, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at gmain.c:3708
#3  0x000000386a6496dc in g_main_context_iteration (context=0x7f65a40009a0, may_block=1) at gmain.c:3774
#4  0x00000038707b2ec6 in QEventDispatcherGlib::processEvents (this=0x7f65a40008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:427
#5  0x0000003870782edf in QEventLoop::processEvents (this=this@entry=0x7f65a913dcc0, flags=...) at kernel/qeventloop.cpp:149
#6  0x000000387078322d in QEventLoop::exec (this=this@entry=0x7f65a913dcc0, flags=...) at kernel/qeventloop.cpp:204
#7  0x0000003870679baf in QThread::exec (this=this@entry=0x2ed73e0) at thread/qthread.cpp:536
#8  0x0000003870763863 in QInotifyFileSystemWatcherEngine::run (this=0x2ed73e0) at io/qfilesystemwatcher_inotify.cpp:265
#9  0x000000387067c3af in QThreadPrivate::start (arg=0x2ed73e0) at thread/qthread_unix.cpp:338
#10 0x0000003866e07f33 in start_thread (arg=0x7f65a913e700) at pthread_create.c:309
#11 0x00000038662f4ded in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111

Thread 1 (Thread 0x7f6647d7a8c0 (LWP 20987)):
[KCrash Handler]
#6  0x0000003866e11314 in _xbegin () at ../nptl/sysdeps/unix/sysv/linux/x86/hle.h:53
#7  __lll_timedlock_elision (futex=futex@entry=0x7f663e997008, adapt_count=adapt_count@entry=0x7f663e99701c, t=0x7fff945d81c0, private=128) at ../nptl/sysdeps/unix/sysv/linux/x86/elision-lock.c:56
#8  0x0000003866e0ab17 in pthread_mutex_timedlock (mutex=0x7f663e997008, abstime=0x7fff945d81c0) at ../nptl/pthread_mutex_timedlock.c:103
#9  0x000000358e43ca3c in pthreadTimedLock::lock (this=0x2a2b910) at /usr/src/debug/kdelibs-4.12.3/kdecore/util/kshareddatacache_p.h:252
#10 0x000000358e43735a in lock (this=0x225c040) at /usr/src/debug/kdelibs-4.12.3/kdecore/util/kshareddatacache.cpp:1236
#11 cautiousLock (this=<optimized out>) at /usr/src/debug/kdelibs-4.12.3/kdecore/util/kshareddatacache.cpp:1259
#12 CacheLocker (_d=0x225c040, this=<synthetic pointer>) at /usr/src/debug/kdelibs-4.12.3/kdecore/util/kshareddatacache.cpp:1309
#13 KSharedDataCache::insert (this=0x22fa2f0, key=..., data=...) at /usr/src/debug/kdelibs-4.12.3/kdecore/util/kshareddatacache.cpp:1447
#14 0x000000358edfd554 in KIconLoaderPrivate::insertCachedPixmapWithPath (this=0x2292440, key=..., data=..., path=...) at /usr/src/debug/kdelibs-4.12.3/kdeui/icons/kiconloader.cpp:827
#15 0x000000358edfe023 in KIconLoader::loadIcon (this=0x2220840, _name=..., group=group@entry=KIconLoader::Small, size=size@entry=16, state=state@entry=0, overlays=..., path_store=path_store@entry=0x0, canReturnNull=canReturnNull@entry=true) at /usr/src/debug/kdelibs-4.12.3/kdeui/icons/kiconloader.cpp:1205
#16 0x000000358ef7fd52 in KWindowSystem::icon (win=<optimized out>, width=16, height=16, scale=scale@entry=true, flags=flags@entry=15) at /usr/src/debug/kdelibs-4.12.3/kdeui/windowmanagement/kwindowsystem_x11.cpp:706
#17 0x000000358ef80333 in KWindowSystem::icon (win=<optimized out>, width=<optimized out>, height=<optimized out>, scale=scale@entry=true) at /usr/src/debug/kdelibs-4.12.3/kdeui/windowmanagement/kwindowsystem_x11.cpp:639
#18 0x00007f662de2d279 in Pager::recalculateWindowRects (this=0x2761da0) at /usr/src/debug/kde-workspace-4.11.8/plasma/desktop/applets/pager/pager.cpp:610
#19 0x00007f662de2e4c5 in Pager::qt_static_metacall (_o=<optimized out>, _id=<optimized out>, _a=0x7fff945d8980, _c=<optimized out>) at /usr/src/debug/kde-workspace-4.11.8/x86_64-redhat-linux-gnu/plasma/desktop/applets/pager/pager.moc:124
#20 0x0000003870798cf8 in QMetaObject::activate (sender=0x2a2fbf0, m=<optimized out>, local_signal_index=<optimized out>, argv=0x0) at kernel/qobject.cpp:3547
#21 0x000000387079d0a1 in QObject::event (this=0x2a2fbf0, e=<optimized out>) at kernel/qobject.cpp:1156
#22 0x00000039febc9d8c in QApplicationPrivate::notify_helper (this=this@entry=0x21933c0, receiver=receiver@entry=0x2a2fbf0, e=e@entry=0x7fff945d8df0) at kernel/qapplication.cpp:4562
#23 0x00000039febd0725 in QApplication::notify (this=this@entry=0x218cfb0, receiver=receiver@entry=0x2a2fbf0, e=e@entry=0x7fff945d8df0) at kernel/qapplication.cpp:4348
#24 0x000000358ee4ab0a in KApplication::notify (this=0x218cfb0, receiver=0x2a2fbf0, event=0x7fff945d8df0) at /usr/src/debug/kdelibs-4.12.3/kdeui/kernel/kapplication.cpp:311
#25 0x000000387078439d in QCoreApplication::notifyInternal (this=0x218cfb0, receiver=0x2a2fbf0, event=event@entry=0x7fff945d8df0) at kernel/qcoreapplication.cpp:949
#26 0x00000038707b5ae3 in sendEvent (event=0x7fff945d8df0, receiver=<optimized out>) at kernel/qcoreapplication.h:231
#27 QTimerInfoList::activateTimers (this=this@entry=0x2195570) at kernel/qeventdispatcher_unix.cpp:621
#28 0x00000038707b2c31 in timerSourceDispatch (source=source@entry=0x2195510) at kernel/qeventdispatcher_glib.cpp:186
#29 0x000000386a6492a6 in g_main_dispatch (context=0x21937a0) at gmain.c:3066
#30 g_main_context_dispatch (context=context@entry=0x21937a0) at gmain.c:3642
#31 0x000000386a649628 in g_main_context_iterate (context=context@entry=0x21937a0, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at gmain.c:3713
#32 0x000000386a6496dc in g_main_context_iteration (context=0x21937a0, may_block=1) at gmain.c:3774
#33 0x00000038707b2ea5 in QEventDispatcherGlib::processEvents (this=0x2192830, flags=...) at kernel/qeventdispatcher_glib.cpp:425
#34 0x00000039fec6bca6 in QGuiEventDispatcherGlib::processEvents (this=<optimized out>, flags=...) at kernel/qguieventdispatcher_glib.cpp:207
#35 0x0000003870782edf in QEventLoop::processEvents (this=this@entry=0x7fff945d9080, flags=...) at kernel/qeventloop.cpp:149
#36 0x000000387078322d in QEventLoop::exec (this=this@entry=0x7fff945d9080, flags=...) at kernel/qeventloop.cpp:204
#37 0x0000003870788749 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1221
#38 0x00000039febc83fc in QApplication::exec () at kernel/qapplication.cpp:3823
#39 0x0000003bbea3d9cc in kdemain (argc=1, argv=0x7fff945d92f8) at /usr/src/debug/kde-workspace-4.11.8/plasma/desktop/shell/main.cpp:126
#40 0x0000003866221d65 in __libc_start_main (main=0x400940 <main(int, char**)>, argc=1, argv=0x7fff945d92f8, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fff945d92e8) at libc-start.c:285
#41 0x0000000000400971 in _start ()

Reported using DrKonqi