Re: Logical replication launcher did not automatically restart when got SIGKILL

On Thu, Jul 24, 2025 at 6:46 PM shveta malik <shveta(dot)malik(at)gmail(dot)com> wrote:
> Sounds reasonable.
> Thinking out loud, when cleaning up after a backend or background
> worker crash, process_pm_child_exit() is invoked, which subsequently
> calls both CleanupBackend() and HandleChildCrash(). After the cleanup
> completes, process_pm_child_exit() calls PostmasterStateMachine() to
> move to the next state. As part of that, PostmasterStateMachine()
> invokes ResetBackgroundWorkerCrashTimes() (only in crash
> scenarios/FatalError), to reset a few things. Since it also resets
> rw_worker.bgw_notify_pid, it seems reasonable to reset the rw_pid as
> well there.

Thanks!
Attached is a patch that fixes the issue by resetting rw_pid in
ResetBackgroundWorkerCrashTimes().

We should probably add a regression test for this case,
but I'd prefer to commit the fix first and work on the test separately.
Andrey Rudometov proposed a test patch in thread [1],
which we might use as a starting point.

Regards,

[1] https://postgr.es/m/CAF6JsWiO=i24qYitWe6ns1sXqcL86rYxdyU+pNYk-WueKPSySg@mail.gmail.com

--
Fujii Masao