https://bugs.kde.org/show_bug.cgi?id=333544

--- Comment #1 from Matthew Woehlke <mw_triad@users.sourceforge.net> ---
Created attachment 87902
  --> https://bugs.kde.org/attachment.cgi?id=87902&action=edit
New crash information added by DrKonqi

kwin (4.11.10) on KDE Platform 4.12.5 using Qt 4.8.6

Similar crash, same circumstances... running an application under valgrind
takes down kwin. For me this is 100% reproducible with a development build of
Slicer (http://www.slicer.org/), although that's a bit excessive as a test
case, but valgrind, and not the specific application running in valgrind,
appears to be the critical component.

-- Backtrace (Reduced):
#6  0x0000003866e11314 in _xbegin () at
../nptl/sysdeps/unix/sysv/linux/x86/hle.h:53
#7  __lll_timedlock_elision (futex=futex@entry=0x7f1b9fc4c008,
adapt_count=adapt_count@entry=0x7f1b9fc4c01c, t=0x7fff6d02dd40, private=128) at
../nptl/sysdeps/unix/sysv/linux/x86/elision-lock.c:56
#8  0x0000003866e0ab17 in pthread_mutex_timedlock (mutex=0x7f1b9fc4c008,
abstime=0x7fff6d02dd40) at ../nptl/pthread_mutex_timedlock.c:103
#9  0x000000318d83ca5c in pthreadTimedLock::lock (this=0xbaf9e0) at
/usr/src/debug/kdelibs-4.12.5/kdecore/util/kshareddatacache_p.h:252
#10 0x000000318d83b93a in lock (this=0xba4a70) at
/usr/src/debug/kdelibs-4.12.5/kdecore/util/kshareddatacache.cpp:1236

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