Re: 12.1 not useable: clientlib fails after a dozen queries (GSSAPI ?)

Stephen Frost <[email protected]> Fri, 10 Jan 2020 15:38:07 -0500

Newsgroups	gmane.comp.db.postgresql.devel.general
Message-ID	<[email protected]>

Greetings,

* Tom Lane ([email protected]) wrote:
> I wrote:
> > I haven't run it further to ground than that, but there's definitely
> > something fishy here.  Based on just these results one would be hard
> > pressed to say if it's our bug or FreeBSD's, but your report that you
> > don't see the failure with PG 11 makes it sound like our problem.
> 
> Ah, I have it: whoever wrote pg_GSS_read() failed to pay attention
> to the fact that setting errno is a critical part of its API.
> Sometimes it returns -1 while leaving errno in a state that causes
> pqReadData to draw the wrong conclusions.  In particular that can
> happen when it reads an incomplete packet, and that's very timing
> dependent, which is why this is so ticklish to reproduce.

Ah-hah.  Not sure if that was Robbie or myself (probably me, really,
since I rewrote a great deal of that code).  I agree that the regression
tests don't test with very much data, but I tested pushing quite a bit
of data through and didn't see any issues with my testing.  Apparently I
was getting pretty lucky. :/

> I'll have a patch in a little while.

That's fantastic, thanks!

Stephen

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