Re: upgrades in row-level locks can deadlock

From: Oleksii Kliukin <alexk(at)hintbits(dot)com>
To: Álvaro Herrera <alvherre(at)2ndquadrant(dot)com>
Cc: PostgreSQL Hackers <pgsql-hackers(at)lists(dot)postgresql(dot)org>
Subject: Re: upgrades in row-level locks can deadlock
Date: 2019-06-14 07:52:18
Message-ID: 98185931-A8A3-4CAB-B2A1-6FDAA536EA36@hintbits.com
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Alvaro Herrera <alvherre(at)2ndquadrant(dot)com> wrote:

> On 2019-Jun-13, Alvaro Herrera wrote:
>
>> On 2019-Jun-13, Oleksii Kliukin wrote:
>>
>>> Makes sense. For the symmetry I have included those that perform lock
>>> upgrades in one session and those that doesn’t, while the other sessions
>>> acquire locks, do updates or deletes. For those that don’t upgrade locks the
>>> test checks that the locks are acquired in the correct order.
>>
>> Thanks for the updated patch! I'm about to push to branches 9.6-master.
>> It applies semi-cleanly (only pgindent-maturity whitespace conflicts).
>
> Done, thanks for the report and patch!
>
> I tried hard to find a scenario that this patch breaks, but couldn't
> find anything.

Thank you very much for reviewing and committing it!

Cheers,
Oleksii

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