Horton

Re: [BUG] FailedAssertion in SnapBuildPurgeOlderTxn

Amit Kapila <amit.kapila16@gmail.com>

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From: Amit Kapila <amit.kapila16@gmail.com>
To: Andres Freund <andres@anarazel.de>
Cc: Maxim Orlov <orlovmg@gmail.com>, Postgres hackers <pgsql-hackers@lists.postgresql.org>
Date: 2022-11-22T03:04:23Z
Lists: pgsql-hackers 
On Tue, Nov 22, 2022 at 2:22 AM Andres Freund <andres@anarazel.de> wrote:
>
> On 2022-11-21 15:47:12 +0300, Maxim Orlov wrote:
> > After some investigation, I think, the problem is in the snapbuild.c
> > (commit 272248a0c1b1, see [0]). We do allocate InitialRunningXacts
> > array in the context of builder->context, but for the time when we call
> > SnapBuildPurgeOlderTxn this context may be already free'd. Thus,
> > InitialRunningXacts array become array of 2139062143 (i.e. 0x7F7F7F7F)
> > values. This is not caused buildfarm to fail due to that code:
>
> Amit, that does indeed seem to be a problem...
>

I'll look into it.

-- 
With Regards,
Amit Kapila.

Commits

  1. Fix uninitialized access to InitialRunningXacts during decoding.

  2. Fix catalog lookup with the wrong snapshot during logical decoding.