| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | Maxim Sobolev <sobomax(at)sippysoft(dot)com> |
| Cc: | pgsql-bugs(at)postgresql(dot)org, Konstantin Belousov <kib(at)freebsd(dot)org> |
| Subject: | Re: BUG #14206: Switch to using POSIX semaphores on FreeBSD |
| Date: | 2016-06-22 16:01:41 |
| Message-ID: | 1083.1466611301@sss.pgh.pa.us |
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| Lists: | pgsql-bugs |
Maxim Sobolev <sobomax(at)sippysoft(dot)com> writes:
> From the man semopt:
> [EINVAL] No semaphore set corresponds to semid, or the process
> would exceed the system-defined limit for the number
> of per-process SEM_UNDO structures.
> AFAIK we've been hitting the second cause there. This is with FreeBSD 10.3
> and postgresql 9.2.16 specifically. We've also seen this with 9.1 I think,
> but I am not 100% sure. The specific limit that got exceeded
> was kern.ipc.semmnu.
We never ask semop(2) for SEM_UNDO, so are you sure this isn't a kernel
bug? I've never heard of such a report on any other platform.
regards, tom lane
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