Re: windows CI failing PMSignalState->PMChildFlags[slot] == PM_CHILD_ASSIGNED

On Wed, Feb 8, 2023 at 2:52 PM Thomas Munro <thomas(dot)munro(at)gmail(dot)com> wrote:
> On Wed, Feb 8, 2023 at 2:28 PM Andres Freund <andres(at)anarazel(dot)de> wrote:
> > TRAP: failed Assert("PMSignalState->PMChildFlags[slot] == PM_CHILD_ASSIGNED"), File: "../src/backend/storage/ipc/pmsignal.c", Line: 329, PID: 5948

I was wondering if commit 18a4a620 might be relevant, as it touched
the management of those slots a few months ago, but then I found a
couple of matches from 2021 in my database of build farm assertion
failures:

https://buildfarm.postgresql.org/cgi-bin/show_log.pl?nm=fairywren&dt=2021-08-12%2010:38:56
https://buildfarm.postgresql.org/cgi-bin/show_log.pl?nm=fairywren&dt=2021-09-28%2016:40:49

Fairywren is a Windows + msys2 system, so it doesn't share Cygwin's
signal system, it's running the pure Windows code (though it's GCC
instead of MSVC and has a different libc, it's using our Windows
native code paths and defines WIN32).