Re: [HACKERS] [sqlsmith] stuck spinlock in pg_stat_get_wal_receiver after OOM

Andres Freund <andres@anarazel.de> writes:
> On 2017-10-02 22:56:49 +0200, Andreas Seltenreich wrote:
>> low-memory testing with REL_10_STABLE at 1f19550a87 produced the
>> following PANIC:
>> stuck spinlock detected at pg_stat_get_wal_receiver, walreceiver.c:1397

> Ugh.

Egad.

> Yes, that'd be a bad idea. It's not great to have memcpys in a critical
> section, but it's way better than pallocs. So we need to use some local
> buffers that this get copied to.

Or replace the spinlock with an LWLock?  In any case, I think it would be
a good idea to look at every other critical section touching that lock
to see if there are any other blatant coding-rule violations.
        regards, tom lane


-- 
Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org)
To make changes to your subscription:
http://www.postgresql.org/mailpref/pgsql-hackers