Comment 2 for bug 1208072

StacktraceTop:
 __assert_fail_base (fmt=0x7f04a048e3b8 "%s%s%s:%u: %s%sAssertion `%s' failed.\n%n", assertion=assertion@entry=0x7f04a06e07d8 "(-(e)) != 3 || !robust", file=file@entry=0x7f04a06e0dfe "pthread_mutex_lock.c", line=line@entry=317, function=function@entry=0x7f04a06e08e0 <__PRETTY_FUNCTION__.8533> "__pthread_mutex_lock_full") at assert.c:92
 __GI___assert_fail (assertion=assertion@entry=0x7f04a06e07d8 "(-(e)) != 3 || !robust", file=file@entry=0x7f04a06e0dfe "pthread_mutex_lock.c", line=line@entry=317, function=function@entry=0x7f04a06e08e0 <__PRETTY_FUNCTION__.8533> "__pthread_mutex_lock_full") at assert.c:101
 __pthread_mutex_lock_full (mutex=0x7f04a06c8828 <main_arena+232>) at pthread_mutex_lock.c:317
 wxMutexInternal::Lock() () from /tmp/apport_sandbox_xnHL69/usr/lib/x86_64-linux-gnu/libwx_baseu-2.8.so.0
 wxEvtHandler::AddPendingEvent(wxEvent&) () from /tmp/apport_sandbox_xnHL69/usr/lib/x86_64-linux-gnu/libwx_baseu-2.8.so.0