| From: | Thomas Munro <thomas(dot)munro(at)gmail(dot)com> |
|---|---|
| To: | Noah Misch <noah(at)leadboat(dot)com> |
| Cc: | Daniel Gustafsson <daniel(at)yesql(dot)se>, Kyotaro HORIGUCHI <horiguchi(dot)kyotaro(at)lab(dot)ntt(dot)co(dot)jp>, "9erthalion6(at)gmail(dot)com" <9erthalion6(at)gmail(dot)com>, "sfrost(at)snowman(dot)net" <sfrost(at)snowman(dot)net>, "pgsql-hackers(at)postgresql(dot)org" <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: [HACKERS] Weaker shmem interlock w/o postmaster.pid |
| Date: | 2019-04-08 08:07:28 |
| Message-ID: | CA+hUKGKZncyFcQ95VQOXiTBPiyxhiJ-9YKTso=SHMQikyKhJyg@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Mon, Apr 8, 2019 at 6:42 PM Noah Misch <noah(at)leadboat(dot)com> wrote:
> - lorikeet's FailedAssertion("!(vmq->mq_sender == ((void *)0))" looked
> suspicious, but this happened six other times in the past year[2], always on
> v10 lorikeet.
It happens on v11 too:
https://buildfarm.postgresql.org/cgi-bin/show_log.pl?nm=lorikeet&dt=2018-09-25%2010%3A06%3A31
The text changed slightly because we dropped an unnecessary extra
pointer-to-volatile:
FailedAssertion("!(mq->mq_sender == ((void *)0))"
So either two workers started with the same parallel worker number, or
something unexpectedly overwrote the shm_mq struct?
--
Thomas Munro
https://enterprisedb.com
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