pgsql: Fix elog(FATAL) before PostmasterMain() or just after fork().

From: Noah Misch <noah(at)leadboat(dot)com>
To: pgsql-committers(at)lists(dot)postgresql(dot)org
Subject: pgsql: Fix elog(FATAL) before PostmasterMain() or just after fork().
Date: 2024-12-10 21:54:42
Message-ID: E1tL8Bm-002651-Bx@gemulon.postgresql.org
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Fix elog(FATAL) before PostmasterMain() or just after fork().

Since commit 97550c0711972a9856b5db751539bbaf2f88884c, these failed with
"PANIC: proc_exit() called in child process" due to uninitialized or
stale MyProcPid. That was reachable if close() failed in
ClosePostmasterPorts() or setlocale(category, "C") failed, both
unlikely. Back-patch to v13 (all supported versions).

Discussion: https://postgr.es/m/20241208034614.45.nmisch@google.com

Branch
------
REL_16_STABLE

Details
-------
https://git.postgresql.org/pg/commitdiff/ac4a2b40392bd5ca9e9e02bad50d437411a8adfb

Modified Files
--------------
src/backend/main/main.c | 2 ++
src/backend/postmaster/fork_process.c | 2 ++
src/backend/postmaster/postmaster.c | 3 +--
3 files changed, 5 insertions(+), 2 deletions(-)

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