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From: Noah Misch <noah@leadboat.com>
To: Thomas Munro <thomas.munro@gmail.com>
Cc: Daniel Gustafsson <daniel@yesql.se>
Cc: Kyotaro HORIGUCHI <horiguchi.kyotaro@lab.ntt.co.jp>
Cc: 9erthalion6@gmail.com <9erthalion6@gmail.com>
Cc: sfrost@snowman.net <sfrost@snowman.net>
Cc: pgsql-hackers@postgresql.org <pgsql-hackers@postgresql.org>
Subject: Re: [HACKERS] Weaker shmem interlock w/o postmaster.pid
Date: Mon, 8 Apr 2019 07:48:04 -0700
Message-ID: <20190408144804.GA2389874@rfd.leadboat.com> (raw)
In-Reply-To: <CA+hUKGKZncyFcQ95VQOXiTBPiyxhiJ-9YKTso=SHMQikyKhJyg@mail.gmail.com>
References: <20190304.180420.139624607.horiguchi.kyotaro@lab.ntt.co.jp>
	<20190307032422.GB1797215@rfd.leadboat.com>
	<20190309071610.GA2039121@rfd.leadboat.com>
	<GrdLgAdUK9FdyZg8VIcTDKVOkys122ZINEb3CjjoySfGj2KyPiMKTh1zqtRp0TAD7FJ27G-OBB3eplxIB5GhcQH5o8zzGZfp0MuJaXJxVxk=@yesql.se>
	<20190331224233.GC891537@rfd.leadboat.com>
	<eUPnXaH0-lP5UPgJAeBbpVF-9I3A9TzxXyQOAsTBO4jmB1sFTzFs6vSwaRAnHTmoDo0wJ-EtuHeyM0vn1LO0xm6NPc_dR0dwOzg8dJrLqhU=@yesql.se>
	<20190404020543.GA1319573@rfd.leadboat.com>
	<20190404145319.GA1720877@rfd.leadboat.com>
	<20190408064141.GA2016666@rfd.leadboat.com>
	<CA+hUKGKZncyFcQ95VQOXiTBPiyxhiJ-9YKTso=SHMQikyKhJyg@mail.gmail.com>

On Mon, Apr 08, 2019 at 08:07:28PM +1200, Thomas Munro wrote:
> On Mon, Apr 8, 2019 at 6:42 PM Noah Misch <noah@leadboat.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?

Ahh.  In that case, it's a duplicate of
https://postgr.es/m/flat/136712b0-0619-5619-4634-0f0286acaef7%402ndQuadrant.com





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  Cc: noah@leadboat.com, thomas.munro@gmail.com, daniel@yesql.se, horiguchi.kyotaro@lab.ntt.co.jp, 9erthalion6@gmail.com, sfrost@snowman.net
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