Re: BUG #16162: create index using gist_trgm_ops leads to panic

From: Heikki Linnakangas <hlinnaka(at)iki(dot)fi>
To: Tomas Vondra <tomas(dot)vondra(at)2ndquadrant(dot)com>, Jeff Janes <jeff(dot)janes(at)gmail(dot)com>
Cc: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, kunert(at)cms(dot)hu-berlin(dot)de, pgsql-bugs <pgsql-bugs(at)lists(dot)postgresql(dot)org>
Subject: Re: BUG #16162: create index using gist_trgm_ops leads to panic
Date: 2019-12-13 17:09:20
Message-ID: 0bbd8286-f592-93db-3897-7b0c06055690@iki.fi
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On 13/12/2019 02:16, Tomas Vondra wrote:
> 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(at)sss(dot)pgh(dot)pa(dot)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(dot)linnakangas(at)iki(dot)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.

Thanks, I'll take a look...

- Heikki

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