Debugging with hhvm: /usr/bin/hhvm ...
GNU gdb (Ubuntu 7.7.1-0ubuntu5~14.04.2) 7.7.1
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(gdb) python sys.path.append("/usr/share/gcc-4.8/python");
(gdb) run xmltest.php
Starting program: /usr/bin/hhvm xmltest.php
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[New Thread 0x7fffe4bff700 (LWP 3762)]
[Thread 0x7fffe4bff700 (LWP 3762) exited]
so much for that

Program received signal SIGSEGV, Segmentation fault.
0x0000000001428ef5 in ?? ()
(gdb) bt 
#0  0x0000000001428ef5 in ?? ()
#1  0x0000000000000000 in ?? ()
(gdb) run -vEval.SyncGdbChunks=1 -vEval.JitNoGdb=false xmltest.php
The program being debugged has been started already.
Start it from the beginning? (y or n) y
[Tue Apr 12 13:24:35 2016] [hphp] [3764:7ffff7fc1100:0:000001] [] Lost parent, LightProcess exiting
[Tue Apr 12 13:24:35 2016] [hphp] [3766:7ffff7fc1100:0:000001] [] Lost parent, LightProcess exiting
[Tue Apr 12 13:24:35 2016] [hphp] [3765:7ffff7fc1100:0:000001] [] Lost parent, LightProcess exiting
[Tue Apr 12 13:24:35 2016] [hphp] [3767:7ffff7fc1100:0:000001] [] Lost parent, LightProcess exiting
[Tue Apr 12 13:24:35 2016] [hphp] [3763:7ffff7fc1100:0:000001] [] Lost parent, LightProcess exiting
Starting program: /usr/bin/hhvm -vEval.SyncGdbChunks=1 -vEval.JitNoGdb=false xmltest.php
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[New Thread 0x7fffe4bff700 (LWP 3855)]
[Thread 0x7fffe4bff700 (LWP 3855) exited]
Possible bad config node: Eval.SyncGdbChunks
so much for that

Program received signal SIGSEGV, Segmentation fault.
0x0000000001428ef5 in ?? ()
(gdb) bt
#0  0x0000000001428ef5 in ?? ()
#1  0x0000000000000000 in ?? ()
(gdb) where
#0  0x0000000001428ef5 in ?? ()
#1  0x0000000000000000 in ?? ()
(gdb)