On Fri, Sep 22, 2017 at 1:19 PM, Robert Haas <robertmh...@gmail.com> wrote:

> On Fri, Sep 22, 2017 at 3:39 PM, Jeff Janes <jeff.ja...@gmail.com> wrote:
> > It turns out it is not new in pg10.  I spotted in the log file only by
> > accident while looking for something else.  Now that I am looking for
> it, I
> > do see it in 9.6 as well.
> So I guess the next question is whether it also shows up if you initdb
> with 9.4.latest and then run the same test.

git bisect shows that it shows up in 9.5, at this commit:

commit bd7c348d83a4576163b635010e49dbcac7126f01
Author: Andres Freund <and...@anarazel.de>
Date:   Sat Sep 26 19:04:25 2015 +0200

    Rework the way multixact truncations work.

The patches which enable the crashes and the rapid consumption of xid and
multixact both need a little adjustment from the 10rc1 versions, so I'm
attaching a combined patch that applies to bd7c348d83.

Not really sure what the next step is here.  I could promote the
ereport(LOG...) to a PANIC to get a core dump, but I don't think that would
help because presumably the problem occurred early, when the truncation was
done, not when it was detected.



Attachment: crash_instrument.patch
Description: Binary data

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