From: Heikki Linnakangas <heikki.linnakangas@iki.fi>
To: pgsql-committers@lists.postgresql.org
Subject: pgsql: Fix double-release of spinlock
Date: Mon, 29 Jul 2024 15:24:52 +0000
Message-ID: <E1sYSF2-001lEB-D1@gemulon.postgresql.org> (raw)
Fix double-release of spinlock
Commit 9d9b9d46f3 added spinlocks to protect the fields in ProcSignal
flags, but in EmitProcSignalBarrier(), the spinlock was released
twice. With most spinlock implementations, releasing a lock that's not
held is not easy to notice, because most of the time it does nothing,
but if the spinlock was concurrently acquired by another process, it
could lead to more serious issues. Fortunately, with the
--disable-spinlocks emulation implementation, it caused more visible
failures.
In the passing, fix a type in comment and add an assertion that the
procNumber passed to SendProcSignal looks valid.
Discussion: https://www.postgresql.org/message-id/b8ce284c-18a2-4a79-afd3-1991a2e7d246@iki.fi
Branch
------
master
Details
-------
https://git.postgresql.org/pg/commitdiff/0393f542d72c6182271c392d9a83d0fc775113c7
Modified Files
--------------
src/backend/storage/ipc/procsignal.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
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To: pgsql-committers@postgresql.org
Cc: heikki.linnakangas@iki.fi, pgsql-committers@lists.postgresql.org
Subject: Re: pgsql: Fix double-release of spinlock
In-Reply-To: <E1sYSF2-001lEB-D1@gemulon.postgresql.org>
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