Re: intermittent failures in Cygwin from select_parallel tests

Andrew Dunstan <andrew(dot)dunstan(at)2ndquadrant(dot)com> writes:
> Buildfarm member lorikeet is failing occasionally with a failed
> assertion during the select_parallel regression tests like this:

> 2017-06-03 05:12:37.382 EDT [59327d84.1160:38] LOG: statement: select count(*) from tenk1, tenk2 where tenk1.hundred > 1 and tenk2.thousand=0;
> TRAP: FailedAssertion("!(vmq->mq_sender == ((void *)0))", File: "/home/andrew/bf64/root/HEAD/pgsql.build/../pgsql/src/backend/storage/ipc/shm_mq.c", Line: 221)

> I'll see if I can find out why, but if anyone has any ideas why this might be happening (started about 3 weeks ago) that would be helpful.

Well, this seems like it has to indicate an incorrect call of
shm_mq_set_sender. I have no great insights as to what might be causing
that, but I sure find it to be pretty unacceptable coding practice that
the call sites are not checking for failure returns from shm_toc_lookup.

regards, tom lane