https://bugzilla.wikimedia.org/show_bug.cgi?id=67348

--- Comment #4 from Ori Livneh <[email protected]> ---
The crash I am able to easily reproduce is this:

# 0  bt_handler at /srv/hhvm-dev/hphp/util/process.h:81
# 1  lua_sethook at /usr/lib/x86_64-linux-gnu/liblua5.1.so.0:0
# 2  luasandbox_timer_handle_profiler at /srv/luasandbox/timer.c:218
# 3  timer_sigev_thread at
/build/buildd/eglibc-2.19/rt/../nptl/sysdeps/unix/sysv/linux/timer_routines.c:66
# 4  start_thread at /build/buildd/eglibc-2.19/nptl/pthread_create.c:312
# 5  clone at
/build/buildd/eglibc-2.19/misc/../sysdeps/unix/sysv/linux/x86_64/clone.S:113

No PHP stack trace is present.

Some cursory Googling produced a few posts in which people grumble about
lua_sethook not being signal-safe, contrary to what is claimed in the source:
http://lua-users.org/lists/lua-l/2012-02/msg00060.html
http://lua-users.org/lists/lua-l/2012-02/msg00060.html

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