--- Comment #1 from Tim Starling <tstarl...@wikimedia.org> ---
If PHP did a longjmp() out of a signal handler, as in a request timeout, and
wmerrors somehow failed to detect the situation, then this could happen.
luasandbox_timer_destroy() could be interrupted by the signal and then
re-entered during request shutdown. If this is what happened, there may
possibly be a correlated syslog line when the deadlock began.
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