On 2024-06-18 Tu 3:00 PM, Andres Freund wrote:
Hi,

On 2024-06-18 10:10:17 -0700, Noah Misch wrote:
On Mon, Jun 17, 2024 at 11:11:17AM -0700, Andres Freund wrote:
On 2024-06-15 16:48:24 -0700, Noah Misch wrote:
On Sat, Jun 15, 2024 at 01:26:57PM -0400, Robert Haas wrote:
The one
thing I know about that *I* think is a pretty big problem about Perl
is that IPC::Run is not really maintained.
I don't see inhttps://github.com/cpan-authors/IPC-Run/issues  anything
affecting PostgreSQL.  If you know of IPC::Run defects, please report them.
If I knew of an IPC::Run defect affecting PostgreSQL, I likely would work on
it before absurdity likehttps://github.com/cpan-authors/IPC-Run/issues/175
NetBSD-10-specific behavior coping.
1) Sometimes hangs hard on windows if started processes have not been shut
    down before script exits.  I've mostly encountered this via the buildfarm /
    CI, so I never had a good way of narrowing this down. It's very painful
    because things seem to often just get stuck once that happens.
That's bad.  Do you have a link to a log, a thread discussing it, or even just
one of the test names experiencing it?
I'm unfortunately blanking on the right keyword right now.

I think it basically required not shutting down a process started in the
background with IPC::Run.

I'll try to repro it by removing some ->finish or ->quit calls.

There's also a bunch of tests that have blocks like

        # some Windows Perls at least don't like IPC::Run's start/kill_kill 
regime.
        skip "Test fails on Windows perl", 2 if $Config{osname} eq 'MSWin32';

Some of them may have been related to this.


I only found one of those, in src/test/recovery/t/006_logical_decoding.pl, which seems to be the only place we use kill_kill at all. That comment dates back to 2017, so maybe a more modern perl and/or IPC::Run will improve matters.

It's not clear to me why that code isn't calling finish() before trying kill_kill(). That's what the IPC::Run docs seem to suggest you should do.


cheers


andrew

--
Andrew Dunstan
EDB:https://www.enterprisedb.com

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