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Michael Paquier e381843cfa Fix orphaned processes when startup process fails during PM_STARTUP 
When the startup process exists with a FATAL error during PM_STARTUP,
the postmaster called ExitPostmaster() directly, assuming that no other
processes are running at this stage.  Since 7ff23c6d27, this
assumption is not true, as the checkpointer, the background writer, the
IO workers and bgworkers kicking in early would be around.

This commit removes the startup-specific shortcut happening in
process_pm_child_exit() for a failing startup process during PM_STARTUP,
falling down to the existing exit() flow to signal all the started
children with SIGQUIT, so as we have no risk of creating orphaned
processes.

This required an extra change in HandleFatalError() for v18 and newer
versions, as an assertion could be triggered for PM_STARTUP.  It is now
incorrect.  In v17 and older versions, HandleChildCrash() needs to be
changed to handle PM_STARTUP so as children can be waited on.

While on it, fix a comment at the top of postmaster.c.  It was claiming
that the checkpointer and the background writer were started after
PM_RECOVERY.  That is not the case.

Author: Ayush Tiwari <ayushtiwari.slg01@gmail.com>
Discussion: https://postgr.es/m/CAJTYsWVoD3V9yhhqSae1_wqcnTdpFY-hDT7dPm5005ZFsL_bpA@mail.gmail.com
Backpatch-through: 15
2026-04-21 09:40:04 +09:00
config Allow PG_PRINTF_ATTRIBUTE to be different in C and C++ code. 2026-02-25 11:57:26 -05:00
contrib Avoid memory leak on error while parsing pg_stat_statements dump file 2026-03-27 12:21:38 +02:00
doc doc: Correct context description for some JIT support GUCs 2026-04-21 08:45:13 +09:00
src Fix orphaned processes when startup process fails during PM_STARTUP 2026-04-21 09:40:04 +09:00
.abi-compliance-history Update .abi-compliance-history for change to enum ProcSignalReason 2026-04-16 23:48:41 +09:00
.cirrus.star ci: Simplify ci-os-only handling 2025-08-14 12:02:42 -04:00
.cirrus.tasks.yml Fix typo 2026-01-07 15:48:54 +01:00
.cirrus.yml ci: Per-repo configuration for manually trigger tasks 2025-08-14 11:33:47 -04:00
.dir-locals.el Make Emacs perl-mode indent more like perltidy. 2019-01-13 11:32:31 -08:00
.editorconfig Add .editorconfig 2019-12-18 09:13:13 +01:00
.git-blame-ignore-revs Add previous commit to .git-blame-ignore-revs. 2025-10-21 10:02:19 -05:00
.gitattributes Fix git whitespace warning 2025-08-15 10:32:07 +02:00
.gitignore Update top-level .gitignore. 2022-12-04 15:23:00 -05:00
aclocal.m4 autoconf: Move export_dynamic determination to configure 2022-12-06 18:55:28 -08:00
configure Allow PG_PRINTF_ATTRIBUTE to be different in C and C++ code. 2026-02-25 11:57:26 -05:00
configure.ac Allow PG_PRINTF_ATTRIBUTE to be different in C and C++ code. 2026-02-25 11:57:26 -05:00
COPYRIGHT Update copyright for 2026 2026-01-01 13:24:10 -05:00
GNUmakefile.in Allow selecting the git revision to be packaged by "make dist". 2024-05-03 11:08:50 -04:00
HISTORY Canonicalize some URLs 2020-02-10 20:47:50 +01:00
Makefile Adapt REL_17_STABLE to its new status as a stable branch 2024-07-01 08:05:35 +09:00
meson.build Allow PG_PRINTF_ATTRIBUTE to be different in C and C++ code. 2026-02-25 11:57:26 -05:00
meson_options.txt Allow selecting the git revision to be packaged by "make dist". 2024-05-03 11:08:50 -04:00
README.md Adapt REL_17_STABLE to its new status as a stable branch 2024-07-01 08:05:35 +09:00

README.md

PostgreSQL Database Management System

This directory contains the source code distribution of the PostgreSQL database management system.

PostgreSQL is an advanced object-relational database management system that supports an extended subset of the SQL standard, including transactions, foreign keys, subqueries, triggers, user-defined types and functions. This distribution also contains C language bindings.

Copyright and license information can be found in the file COPYRIGHT.

General documentation about this version of PostgreSQL can be found at https://www.postgresql.org/docs/17/. In particular, information about building PostgreSQL from the source code can be found at https://www.postgresql.org/docs/17/installation.html.

The latest version of this software, and related software, may be obtained at https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.