Re: postgres access violation in pg_detoast_datum

Álvaro Herrera <alvherre@kurilemu.de>

From: Álvaro Herrera <alvherre@kurilemu.de>

To: Arnd Empting <arnd.empting@koerber.com>

Cc: "pgsql-bugs@lists.postgresql.org" <pgsql-bugs@lists.postgresql.org>

Date: 2025-10-21T08:21:24Z

Lists: pgsql-bugs

On 2025-Oct-21, Arnd Empting wrote:

> Crashing postgres executable due to access violation in pg_detoast_datum
> 
> ExceptionAddress: 00007ff6ef1e86f0 (postgres!pg_detoast_datum)
> ExceptionCode: c0000005 (Access violation)

You may well have corrupt data in your tables.  I suspect some parts of
the detoasting code are still not robust enough against that and could
cause server crashes.

It would be good, at some point, to look into fuzzing the toast code
with random bytes so that we can report errors rather than crashing ...

-- 
Álvaro Herrera               48°01'N 7°57'E  —  https://www.EnterpriseDB.com/
"Uno puede defenderse de los ataques; contra los elogios se esta indefenso"