Bug#685524: After upgrading to 4:4.8.2+dfsg-1 kwin segfaults on startup

[Arto Jantunen <viiru@debian.org>]

Control: severity -1 grave

The bug is reproducible with pure sid (kernel 3.2.0-3-amd64) as well,
also here is an improved backtrace:

#0  __memcpy_ssse3 () at ../sysdeps/x86_64/multiarch/memcpy-ssse3.S:495
#1  0x00007ffff41e80bb in memcpy (__len=<optimized out>, 
    __src=<optimized out>, __dest=<optimized out>)
    at /usr/include/x86_64-linux-gnu/bits/string3.h:52
#2  executableCopy (allocator=0x7fffd185d960, this=<optimized out>)
    at ../3rdparty/javascriptcore/JavaScriptCore/assembler/AssemblerBuffer.h:139
#3  executableCopy (allocator=0x7fffd185d960, this=0x7fffffffda00)
    at ../3rdparty/javascriptcore/JavaScriptCore/assembler/X86Assembler.h:1885
#4  executableCopy (allocator=0x7fffd185d960, this=0x7fffffffda00)
    at ../3rdparty/javascriptcore/JavaScriptCore/assembler/X86Assembler.h:1583
#5  LinkBuffer (executablePool=..., masm=0x7fffffffda00, this=0x7fffffffd970)
    at ../3rdparty/javascriptcore/JavaScriptCore/assembler/LinkBuffer.h:67
#6  QTJSC::JIT::privateCompileCTIMachineTrampolines (this=0x7fffffffda00, 
    executablePool=0x7fffd18579e8, globalData=<optimized out>, 
    ctiStringLengthTrampoline=0x7fffd18579f0, 
    ctiVirtualCallLink=0x7fffd18579f8, ctiVirtualCall=0x7fffd1857a00, 
    ctiNativeCallThunk=0x7fffd1857a08)
    at ../3rdparty/javascriptcore/JavaScriptCore/jit/JITOpcodes.cpp:1817
#7  0x00007ffff41fd7ec in QTJSC::JIT::compileCTIMachineTrampolines (
    globalData=0x7fffd1856800, 
    executablePool=executablePool@entry=0x7fffd18579e8, 
    ctiStringLengthTrampoline=ctiStringLengthTrampoline@entry=0x7fffd18579f0, 
    ctiVirtualCallLink=ctiVirtualCallLink@entry=0x7fffd18579f8, 
    ctiVirtualCall=ctiVirtualCall@entry=0x7fffd1857a00, 
    ctiNativeCallThunk=ctiNativeCallThunk@entry=0x7fffd1857a08)
    at ../3rdparty/javascriptcore/JavaScriptCore/jit/JIT.h:323
#8  0x00007ffff41f9ca3 in QTJSC::JITThunks::JITThunks (this=0x7fffd18579e8, 
    globalData=<optimized out>)
    at ../3rdparty/javascriptcore/JavaScriptCore/jit/JITStubs.cpp:768
#9  0x00007ffff4246748 in QTJSC::JSGlobalData::JSGlobalData (
    this=0x7fffd1856800, isShared=<optimized out>)
    at ../3rdparty/javascriptcore/JavaScriptCore/runtime/JSGlobalData.cpp:146
#10 0x00007ffff4246dfc in QTJSC::JSGlobalData::create ()
    at ../3rdparty/javascriptcore/JavaScriptCore/runtime/JSGlobalData.cpp:205
#11 0x00007ffff42e7390 in QScriptEnginePrivate::QScriptEnginePrivate (
    this=0xa82ae0) at api/qscriptengine.cpp:979
#12 0x00007ffff42e8386 in QScriptEngine::QScriptEngine (this=0x7fffffffe310)
    at api/qscriptengine.cpp:1964
#13 0x00007ffff7b6babd in ?? ()
   from /usr/lib/kde4/libkdeinit/libkdeinit4_kwin.so
#14 0x00007ffff7afaf15 in kdemain ()
   from /usr/lib/kde4/libkdeinit/libkdeinit4_kwin.so
#15 0x00007ffff7730ead in __libc_start_main (main=<optimized out>, 
    argc=<optimized out>, ubp_av=<optimized out>, init=<optimized out>, 
    fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fffffffe458)
    at libc-start.c:228
#16 0x0000000000400771 in _start ()

This might be hardware dependant, so I'll also mention that the cpu on
this machine is an Intel Core 2 T5500 (family 6, model 15, stepping 6).

-- 
Arto Jantunen