Re: Recent failures in IsolationCheck deadlock-hard

Thomas Munro <thomas(dot)munro(at)gmail(dot)com> writes:
> There have been five failures on three animals like this, over the
> past couple of months:

Also worth noting is that anole failed its first try at the new
deadlock-parallel isolation test:

https://buildfarm.postgresql.org/cgi-bin/show_log.pl?nm=anole&dt=2019-08-01%2015%3A48%3A16

What that looks like is the queries got stuck and eventually
isolationtester gave up and canceled the test. So I'm suspicious
that there's a second bug in the parallel deadlock detection code.

Possibly relevant factoids: all three of the animals in question
run HEAD with force_parallel_mode = regress, and there's reason
to think that their timing behavior could be different from other
animals (anole and gharial run on HPUX, while hyrax uses
CLOBBER_CACHE_ALWAYS).

regards, tom lane