Date: Fri, 13 Dec 2019 01:16:18 +0100
From: Tomas Vondra <tomas.vondra@2ndquadrant.com>
To: Jeff Janes <jeff.janes@gmail.com>
Cc: Tom Lane <tgl@sss.pgh.pa.us>, kunert@cms.hu-berlin.de,
	pgsql-bugs <pgsql-bugs@lists.postgresql.org>
Subject: Re: BUG #16162: create index using gist_trgm_ops leads to panic
Message-ID: <20191213001618.jqeousv77xnlds7x@development>
References: <16162-45d21b7b6c1a3105@postgresql.org>
 <20191212125023.vpk6zbbeldzmyerc@development>
 <26141.1576158262@sss.pgh.pa.us>
 <CAMkU=1ymVJWS_u6ndDarWfaOQz44Td2DWgpA_3t4+OV4xsV3WQ@mail.gmail.com>
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On Thu, Dec 12, 2019 at 07:05:53PM -0500, Jeff Janes wrote:
>On Thu, Dec 12, 2019 at 8:44 AM Tom Lane <tgl@sss.pgh.pa.us> wrote:
>
>>
>> I wonder if this could be a recently-introduced bug?  I do not
>> recall seeing complaints like this before v12.
>>
>
>Looks like the culprit is:
>
>commit 9155580fd5fc2a0cbb23376dfca7cd21f59c2c7b
>Author: Heikki Linnakangas <heikki.linnakangas@iki.fi>
>Date:   Wed Apr 3 17:03:15 2019 +0300
>
>    Generate less WAL during GiST, GIN and SP-GiST index build.
>
>The commit before went 150 iterations with no failures, while this one
>failed on the 15th iteration, then again on 4th.
>

Thanks for the bisect. I've planned to try reproducing this on 11, but
this commit only in 12, so Tom is right it's a recent bug.

regards

-- 
Tomas Vondra                  http://www.2ndQuadrant.com
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services