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From: Tom Lane <[email protected]>
To: [email protected]
Cc: [email protected]
Subject: Re: BUG #19496: Assert("ItemPointerIsValid(pointer)") when using pageinspect
Date: Wed, 27 May 2026 09:57:37 -0400
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
References: <[email protected]>

PG Bug reporting form <[email protected]> writes:
> I found an assertion failure in pageinspect.

> SQL:
> CREATE EXTENSION IF NOT EXISTS pageinspect;
> WITH page AS (
>     SELECT set_byte(
>              set_byte(
>                set_byte(
>                  set_byte(
>                    set_byte(
>                      set_byte(
>                        set_byte(
>                          set_byte(decode(repeat('00', 8192), 'hex'),
>                                   12, 40),
>                          14, 248),
>                        15, 31),
>                      16, 248),
>                    17, 31),
>                  18, 4),
>                19, 32),
>              8190, 131) AS p
>   )
>   SELECT * FROM gin_leafpage_items((SELECT p FROM page));

Does that WITH actually construct a valid GIN page image?
I don't think we make any guarantee that pageinspect
won't crash on bad data.

			regards, tom lane

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