public inbox for [email protected]  

help / color / mirror / Atom feed

From: Tom Lane <[email protected]>
To: Andres Freund <[email protected]>
Cc: Thomas Munro <[email protected]>
Cc: Fujii Masao <[email protected]>
Cc: Nathan Bossart <[email protected]>
Cc: Michael Paquier <[email protected]>
Cc: Postgres hackers <[email protected]>
Subject: Re: Weird failure with latches in curculio on v15
Date: Wed, 01 Feb 2023 10:12:26 -0500
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
References: <[email protected]>
	<[email protected]>
	<CA+hUKGKf9Bgik=g1yPQ-crSuuziyFsScnbauG50O5328TKV1rA@mail.gmail.com>
	<[email protected]>

Andres Freund <[email protected]> writes:
> On 2023-02-01 16:21:16 +1300, Thomas Munro wrote:
>> It's always in proc_exit() in StartupProcShutdownHandler(), a SIGTERM
>> handler which is allowed to call that while in_restore_command is
>> true.

> Ugh, no wonder we're getting crashes. This whole business seems bogus as
> hell.

Indeed :-(

> I don't see a choice but to revert the recent changes. They need a
> fairly large rewrite.

9a740f81e clearly made things a lot worse, but it wasn't great
before.  Can we see a way forward to removing the problem entirely?

The fundamental issue is that we have no good way to break out
of system(), and I think the original idea was that
in_restore_command would be set *only* for the duration of the
system() call.  That's clearly been lost sight of completely,
but maybe as a stopgap we could try to get back to that.

			regards, tom lane

view thread (16+ messages)  latest in thread

reply

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Reply to all the recipients using the --to and --cc options:
  reply via email

  To: [email protected]
  Cc: [email protected], [email protected], [email protected], [email protected], [email protected], [email protected], [email protected]
  Subject: Re: Weird failure with latches in curculio on v15
  In-Reply-To: <[email protected]>

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

This inbox is served by agora; see mirroring instructions
for how to clone and mirror all data and code used for this inbox