Re: conchuela timeouts since 2021-10-09 system upgrade

On Sun, Oct 24, 2021 at 09:03:27PM +0300, Andrey Borodin wrote:
> > 24 окт. 2021 г., в 19:19, Noah Misch <noah@leadboat.com> написал(а):
> > These failures started on 2021-10-09, the day conchuela updated from DragonFly
> > v4.4.3-RELEASE to DragonFly v6.0.0-RELEASE.  It smells like a kernel bug.
> > Since the theorized kernel bug seems not to affect
> > src/test/subscription/t/015_stream.pl, I wonder if we can borrow a workaround
> > from other tests.  One thing in common with src/test/recovery/t/017_shm.pl and
> > the newest failure sites is that they don't write anything to the child stdin.

> >  If not, does passing the script via stdin, like "pgbench -f-
> > <script.sql", work around the problem?
> 
> I'll test it tomorrow, the refactoring does not seem trivial given we use many simultaneous scripts.

Did that work?  Commit 7f580aa should make this unnecessary for v12+
contrib/amcheck tests, but older branches still need a fix, and 017_shm.pl
needs a fix in all branches.  A backup plan is just to skip affected tests on
dragonfly 6+.  Since the breakage has been limited to so few tests, I'm
optimistic that a better workaround will present itself.