Observed checkpointer crashes in 9.4.4 on Fedora 22

Can anyone identify a likely cause of the stack traces reported here:

https://retrace.fedoraproject.org/faf/reports/853674/

Apparently, what's happening is that PGSemaphoreUnlock is hitting

elog(FATAL, "semop(id=%d) failed: %m", sema->semId);

and then that's being promoted to a PANIC, presumably because we're
inside a critical section.

I have no more data than what's on that webpage --- I just got an
auto-notification that the number of similar reports had reached 10.
Those might all be from the same Fedora user, for all I can tell;
in which case it might have some pedestrian explanation.

regards, tom lane

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