Re: BUG #15727: PANIC: cannot abort transaction 295144144, it was already committed

From: Amit Langote <Langote_Amit_f8(at)lab(dot)ntt(dot)co(dot)jp>
To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, r(dot)zharkov(at)postgrespro(dot)ru
Cc: Alvaro Herrera <alvherre(at)2ndquadrant(dot)com>, Andres Freund <andres(at)anarazel(dot)de>, pgsql-bugs(at)lists(dot)postgresql(dot)org
Subject: Re: BUG #15727: PANIC: cannot abort transaction 295144144, it was already committed
Date: 2019-04-08 07:21:47
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On 2019/04/07 1:23, Tom Lane wrote:
> It seems that there may be some connection between this problem and
> EPQ. I was working on committing Amit's fix for bug #15677, which
> demonstrated that EPQ doesn't work for partitioned-table target rels.
> It seemed like there really needed to be regression test coverage for
> that, so I tried to convert his crasher example into an isolation test.
> It does indeed crash without Amit's fix ... but with it, lookee what
> I get:
> +error in steps c1 complexpartupdate: ERROR: unexpected table_lock_tuple status: 1
> That seems fully reproducible in this test. I haven't looked into
> exactly what's causing that, but now that we have a reproducible
> example, somebody should.
> I'm not quite sure if I should commit this as-is or wait till the
> other problem is fixed. A crash is probably worse than a bogus
> error, but I don't like committing obviously-wrong "expected" output.
> Thoughts?

Thank you Tom for picking it up and adding the test which I should've done
to begin with.

Now that Andres has taken care of the other issues [1], maybe this one's
good to go? The isolation test part needed to be rebased over Andres'
commit, which I've done in the attached updated patch.



Attachment Content-Type Size
bug-15677-fix-with-test_v2.patch text/plain 3.9 KB

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