Re: sidewinder has one failure

=?UTF-8?Q?Mikael_Kjellstr=c3=b6m?= <mikael(dot)kjellstrom(at)mksoft(dot)nu> writes:
> On 2020-01-04 01:15, Tom Lane wrote:
>> Apparently, in the environment of that TAP test, the server has more
>> open FDs at this point than it does when running "normally". I have
>> no idea what the additional FDs might be.

> Well it's running under cron if that makes a difference and what is the
> TAP-test using? perl?

Not sure. There's a few things you could do to investigate:

* Run the recovery TAP tests. Do you reproduce the buildfarm failure
in your hand build? If not, we need to ask what's different.

* If you do reproduce it, run those tests at debug2, just to confirm
the theory that already_open is higher than normal. (The easy way
to make that happen is to add another line to what PostgresNode.pm's
init function is adding to postgresql.conf.)

* Also, try putting a pg_usleep call just before the error in fd.c,
to give yourself enough time to manually point "lsof" at the
postmaster and see what all its FDs are.

regards, tom lane