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Subject: Re: [BUG] Race in online checksums launcher_exit()
From: Daniel Gustafsson <daniel@yesql.se>
In-Reply-To: 
 <CAJTYsWWg6tFrdMhWs5PkwESTNeeUUsMuY17O4UmPPh771c3stA@mail.gmail.com>
Date: Sun, 19 Apr 2026 22:17:08 +0200
Cc: PostgreSQL Hackers <pgsql-hackers@postgresql.org>
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Message-Id: <DC203E71-0319-4832-8079-C8EE2260531C@yesql.se>
References: 
 <CAJTYsWWg6tFrdMhWs5PkwESTNeeUUsMuY17O4UmPPh771c3stA@mail.gmail.com>
To: Ayush Tiwari <ayushtiwari.slg01@gmail.com>
Archived-At: 
 <https://www.postgresql.org/message-id/DC203E71-0319-4832-8079-C8EE2260531C%40yesql.se>
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> On 19 Apr 2026, at 22:09, Ayush Tiwari <ayushtiwari.slg01@gmail.com> =
wrote:
>=20
> Hi hackers,
>=20
> While using the pg_enable_data_checksums() feature, I found a likely =
bug, a race condition in  datachecksum_state.c's launcher_exit().

Thanks for your report.  Tomas and I have worked over the past couple of =
days
on a fixup series due to a rare race condition which was found after =
extensive
longrunning testing.  While hacking on that we identified what I believe =
is the
same bug you found and we have a fix for that, the patchset will be =
shared very
shortly (we am literally putting the final touches on it as I write =
this).
I'll compare notes and will if applicable incorporate your patch into =
it.

--
Daniel Gustafsson