Fix background worker not restarting after crash-and-restart cycle. Previously, if a background worker crashed (e.g., due to a SIGKILL) and the server restarted due to restart_after_crash being enabled, the worker was not restarted as expected. Background workers without the never-restart flag should automatically restart in this case.
This issue was introduced in commit 28a520c0b77, which failed to reset the rw_pid field in the RegisteredBgWorker struct for the crashed worker. This commit fixes the problem by resetting rw_pid for all eligible background workers during the crash-and-restart cycle. Back-patched to v18, where the bug was introduced. Bug fix patches were proposed by Andrey Rudometov and ChangAo Chen, but this commit uses a different approach. Reported-by: Andrey Rudometov <unlimitedhik...@gmail.com> Reported-by: ChangAo Chen <cca5...@qq.com> Author: Andrey Rudometov <unlimitedhik...@gmail.com> Author: ChangAo Chen <cca5...@qq.com> Co-authored-by: Fujii Masao <masao.fu...@gmail.com> Reviewed-by: ChangAo Chen <cca5...@qq.com> Reviewed-by: Shveta Malik <shveta.ma...@gmail.com> Discussion: https://postgr.es/m/CAF6JsWiO=i24qyitwe6ns1sxqcl86ryxdyu+pnyk-wuekps...@mail.gmail.com Discussion: https://postgr.es/m/tencent_e00a056b3953ee6440f0f40f80ec30427...@qq.com Backpatch-through: 18 Branch ------ master Details ------- https://git.postgresql.org/pg/commitdiff/b5d084c5353f29e2e217dfa86f327e14d02998c1 Modified Files -------------- src/backend/postmaster/bgworker.c | 1 + src/backend/postmaster/postmaster.c | 7 +++++++ 2 files changed, 8 insertions(+)
