Re: Inconsistency in startup process's MyBackendId and procsignal array registration with ProcSignalInit()

At Mon, 11 Oct 2021 16:03:57 +0530, Bharath Rupireddy <bharath(dot)rupireddyforpostgres(at)gmail(dot)com> wrote in
> On Mon, Oct 11, 2021 at 12:41 PM Kyotaro Horiguchi
> <horikyota(dot)ntt(at)gmail(dot)com> wrote:
> > (I'm not sure how the trouble happens.)
...
> If some process wants to send the startup process SIGUSR1 with the
> PGPROC->backendId and SendProcSignal(PGPROC->pid, XXXXX,
> PGPROC->backendId) after getting the PGPROC entry from
> AuxiliaryPidGetProc(), then the signal isn't sent. To understand this
> issue, please use a sample patch at [1], have a standby setup, call
> pg_log_backend_memory_contexts with startup process pid on the
> standby, the error "could not send signal to process" is shown, see
> [2].

Thanks, I understand that this doesn't happen on vanilla PG.

regards.

--
Kyotaro Horiguchi
NTT Open Source Software Center