gdb stacktrace of QtWebKit crash

gistfile1.txt

GNU gdb (GDB) 7.6.1-ubuntu
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Reading symbols from /usr/bin/python3.3...Reading symbols from /usr/lib/debug/usr/bin/python3.3...done.
done.
(gdb) run bin/fbmessenger 
Starting program: /usr/bin/python3 bin/fbmessenger
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[New Thread 0x7fffe0447700 (LWP 2123)]
[New Thread 0x7fffdfc46700 (LWP 2124)]
[New Thread 0x7fffde96b700 (LWP 2125)]
[New Thread 0x7fffde16a700 (LWP 2126)]
[New Thread 0x7fffdd969700 (LWP 2127)]
[New Thread 0x7fffcfdc8700 (LWP 2129)]
[Thread 0x7fffcfdc8700 (LWP 2129) exited]
[New Thread 0x7fffcfdc8700 (LWP 2130)]
[Thread 0x7fffcfdc8700 (LWP 2130) exited]
[New Thread 0x7fffcfdc8700 (LWP 2131)]
[New Thread 0x7fffce28b700 (LWP 2132)]
[New Thread 0x7fffcd579700 (LWP 2133)]
[Thread 0x7fffde16a700 (LWP 2126) exited]
[New Thread 0x7fffde16a700 (LWP 2134)]
[New Thread 0x7fffb6c47700 (LWP 2135)]
[New Thread 0x7fffb6446700 (LWP 2136)]
[New Thread 0x7fffb5c45700 (LWP 2137)]
[New Thread 0x7fffb5444700 (LWP 2139)]
[New Thread 0x7fff6fede700 (LWP 2142)]
[New Thread 0x7fff666e7700 (LWP 2143)]
[Thread 0x7fff666e7700 (LWP 2143) exited]
[Thread 0x7fffdd969700 (LWP 2127) exited]
[Thread 0x7fffb6446700 (LWP 2136) exited]
[New Thread 0x7fffb6446700 (LWP 2149)]
[Thread 0x7fffb6446700 (LWP 2149) exited]
[New Thread 0x7fffb6446700 (LWP 2155)]
[Thread 0x7fffb6446700 (LWP 2155) exited]
[New Thread 0x7fffb6446700 (LWP 2156)]

Program received signal SIGSEGV, Segmentation fault.
0x00007fffebc5b9e0 in dfgConvertJSValueToBoolean ()
   from /usr/lib/x86_64-linux-gnu/libQtWebKit.so.4
(gdb) bt
#0  0x00007fffebc5b9e0 in dfgConvertJSValueToBoolean ()
   from /usr/lib/x86_64-linux-gnu/libQtWebKit.so.4
#1  0x00007fff700b1201 in ?? ()
#2  0x00007fffb4844548 in ?? ()
#3  0x00007fff65988380 in ?? ()
#4  0x00007fffbc0cdb60 in ?? ()
#5  0x00007fff65988300 in ?? ()
#6  0x00007fff00000000 in ?? ()
#7  0x00007fff6e88b9e0 in ?? ()
#8  0x00007fff6eeb4200 in ?? ()
#9  0x00007fffeaa6c690 in WebCore::canAccessDocument(JSC::ExecState*, WebCore::Document*, WebCore::SecurityReportingOption) ()
   from /usr/lib/x86_64-linux-gnu/libQtWebKit.so.4
#10 0x00007fffb4844880 in ?? ()
#11 0x00007fffffffbb50 in ?? ()
#12 0x00007fffb4844808 in ?? ()
#13 0x00007fffcccdf200 in ?? ()
#14 0x00007fffcccec300 in ?? ()
#15 0x00007fffffffbb60 in ?? ()
#16 0x00007fffebcd0bbc in JSC::Interpreter::executeCall(JSC::ExecState*, JSC::JSObject*, JSC::CallType, JSC::CallData const&, JSC::JSValue, JSC::ArgList const&) () from /usr/lib/x86_64-linux-gnu/libQtWebKit.so.4
#17 0x00007fffebdb8e6a in JSC::call(JSC::ExecState*, JSC::JSValue, JSC::CallType---Type <return> to continue, or q <return> to quit---
, JSC::CallData const&, JSC::JSValue, JSC::ArgList const&) ()
   from /usr/lib/x86_64-linux-gnu/libQtWebKit.so.4
#18 0x00007fffebdfb05d in JSC::boundFunctionCall(JSC::ExecState*) ()
   from /usr/lib/x86_64-linux-gnu/libQtWebKit.so.4
#19 0x00007fff6ffff265 in ?? ()
#20 0x0000000000000007 in ?? ()
#21 0x00007fff70226833 in ?? ()
#22 0x00000000ffffffff in ?? ()
#23 0x000000000000000a in ?? ()
#24 0x00007fff6e7f9b00 in ?? ()
#25 0x00007fff0000000c in ?? ()
#26 0x00007fff70226656 in ?? ()
#27 0x00007fffebeb1b4b in WTF::fastMalloc(unsigned long) ()
   from /usr/lib/x86_64-linux-gnu/libQtWebKit.so.4
#28 0x00007fffcccec300 in ?? ()
#29 0x00007fffffffbdb0 in ?? ()
#30 0x00007fffebcd0bbc in JSC::Interpreter::executeCall(JSC::ExecState*, JSC::JSObject*, JSC::CallType, JSC::CallData const&, JSC::JSValue, JSC::ArgList const&) () from /usr/lib/x86_64-linux-gnu/libQtWebKit.so.4
#31 0x00007fffebdb8e6a in JSC::call(JSC::ExecState*, JSC::JSValue, JSC::CallType, JSC::CallData const&, JSC::JSValue, JSC::ArgList const&) ()
   from /usr/lib/x86_64-linux-gnu/libQtWebKit.so.4
#32 0x00007fffebdfb05d in JSC::boundFunctionCall(JSC::ExecState*) ()
---Type <return> to continue, or q <return> to quit---
   from /usr/lib/x86_64-linux-gnu/libQtWebKit.so.4
#33 0x00007fff6ffff265 in ?? ()
#34 0x0000000000000007 in ?? ()
#35 0x00007fff70226833 in ?? ()
#36 0x0000000000000000 in ?? ()
(gdb)