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pgsql: Fix race condition where heap_delete() fails to pin VM page.

From:	Jeff Davis <jdavis(at)postgresql(dot)org>
To:	pgsql-committers(at)lists(dot)postgresql(dot)org
Subject:	pgsql: Fix race condition where heap_delete() fails to pin VM page.
Date:	2022-09-22 18:44:49
Message-ID:	E1obRBp-001XZq-AA@gemulon.postgresql.org
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Fix race condition where heap_delete() fails to pin VM page.

Similar to 5f12bc94dc, the code must re-check PageIsAllVisible() after
buffer lock is re-acquired. Backpatching to the same version, 12.

Discussion: https://postgr.es/m/CAEP4nAw9jYQDKd_5Y+-s2E4YiUJq1vqiikFjYGpLShtp-K3gag@mail.gmail.com
Reported-by: Robins Tharakan
Reviewed-by: Robins Tharakan
Backpatch-through: 12

Branch
------
master

Modified Files
--------------
src/backend/access/heap/heapam.c | 30 +++++++++++++++++++-----------
1 file changed, 19 insertions(+), 11 deletions(-)

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