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From: Tom Lane <[email protected]>
To: Robert Haas <[email protected]>
Cc: Andres Freund <[email protected]>
Cc: Justin Pryzby <[email protected]>
Cc: Kyotaro Horiguchi <[email protected]>
Cc: Erik Rijkers <[email protected]>
Cc: Matthias van de Meent <[email protected]>
Cc: PostgreSQL Hackers <[email protected]>
Subject: Re: TRAP: FailedAssertion("HaveRegisteredOrActiveSnapshot()", File: "toast_internals.c", Line: 670, PID: 19403)
Date: Tue, 19 Apr 2022 10:36:36 -0400
Message-ID: <[email protected]> (raw)
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Robert Haas <[email protected]> writes:
> On Mon, Apr 18, 2022 at 4:07 PM Tom Lane <[email protected]> wrote:
>> There may be some corner cases that aren't described by any of these
>> three blanket scenarios, but they've got to be pretty few and far
>> between.

> My first thought whenever anything like this comes up is cursors,
> especially but not only holdable cursors. Also, plpgsql variables,
> maybe mixed with embedded COMMIT/ROLLBACK.

Those exact cases have had detoasting bugs in the past and are now fixed.

> I don't find it
> particularly hard to believe we have some bugs in
> insufficiently-well-considered parts of the system that pass around
> datums outside of the normal executor flow, but I don't know exactly
> how to find them all, either.

I'm not here to claim that there are precisely zero remaining bugs
of this ilk.  I'm just saying that I think we've flushed out most
of them.  I think there is some value in trying to think of a way
to prove that none remain, but it's not a problem we can solve
for v15.

			regards, tom lane

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