[Bug 1284483]

[Apport retracing service]

StacktraceTop:
 __GI___pthread_mutex_lock (mutex=0x0) at ../nptl/pthread_mutex_lock.c:66
 crLockMutex (mutex=<optimized out>) at /build/buildd/virtualbox-4.3.6-dfsg/src/VBox/GuestHost/OpenGL/util/threads.c:166
 crHashtableLock (h=<optimized out>) at /build/buildd/virtualbox-4.3.6-dfsg/src/VBox/GuestHost/OpenGL/util/hash.c:434
 stubSyncThreadProc (ThreadSelf=0x7fd66d299000, pvUser=<optimized out>) at /build/buildd/virtualbox-4.3.6-dfsg/src/VBox/Additions/common/crOpenGL/load.c:898
 rtThreadMain (pThread=0x7fd66d299000, NativeThread=<optimized out>, pszThreadName=<optimized out>) at /build/buildd/virtualbox-4.3.6-dfsg/src/VBox/Runtime/common/misc/thread.cpp:712

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https://bugs.launchpad.net/bugs/1284483

Title:
  __GI___pthread_mutex_lock()

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