Horton

Re: hung backends stuck in spinlock heavy endless loop

Martijn van Oosterhout <kleptog@svana.org>

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From: Martijn van Oosterhout <kleptog@svana.org>
To: Merlin Moncure <mmoncure@gmail.com>
Cc: Peter Geoghegan <pg@heroku.com>, Andres Freund <andres@2ndquadrant.com>, Heikki Linnakangas <hlinnakangas@vmware.com>, Tom Lane <tgl@sss.pgh.pa.us>, PostgreSQL-development <pgsql-hackers@postgresql.org>
Date: 2015-01-24T10:41:24Z
Lists: pgsql-hackers 
On Thu, Jan 22, 2015 at 03:50:03PM -0600, Merlin Moncure wrote:
> Quick update:  not done yet, but I'm making consistent progress, with
> several false starts.  (for example, I had a .conf problem with the
> new dynamic shared memory setting and git merrily bisected down to the
> introduction of the feature.).
> I have to triple check everything :(. The problem is generally
> reproducible but I get false negatives that throws off the bisection.
> I estimate that early next week I'll have it narrowed down
> significantly if not to the exact offending revision.

I've never used it but the BBChop project claims to be able to bisect
even in the case of intermittent failure.

https://github.com/Ealdwulf/bbchop/

It claims to be slow, but I don't think that's the limiting factor here...

Have a nice day,
-- 
Martijn van Oosterhout   <kleptog@svana.org>   http://svana.org/kleptog/
> He who writes carelessly confesses thereby at the very outset that he does
> not attach much importance to his own thoughts.
   -- Arthur Schopenhauer

Commits

  1. Improve hash_create's API for selecting simple-binary-key hash functions.

  2. Fix WAL-logging of B-tree "unlink halfdead page" operation.

  3. Fix backup-block numbering in redo of b-tree split.

  4. Cleanup of new b-tree page deletion code.

  5. Fix bug in the new B-tree incomplete-split code.

  6. Fix bug in new B-tree page deletion code.

  7. Fix rm_desc routine of b-tree page delete records.

  8. Make the handling of interrupted B-tree page splits more robust.

  9. Fix race condition in B-tree page deletion.