On 2016-01-15 10:25 AM, Robert Haas wrote:
On Fri, Jan 15, 2016 at 10:12 AM, Benedikt Grundmann
<bgrundm...@janestreet.com> wrote:
Today we discovered that we had a backend whose client had gone away, the
automatic query watching process had send both pg_cancel and
pg_terminate_backend but nevertheless the process was sitting there
consuming resources and had been for over 1 day...
gdb revealed that we were sitting in pg_regexec (we forced it to return 16
aka invalid regex to return our system into a good state).
Here is the regular expression and the text to run on:
WARNING DO NOT DO THIS ON A PRODUCTION BOX
select regexp_replace('VODI GR,VOD LN,VOD LN,VODN MM,VODPF US,VOD US,VZC
LN', '([^,]+)(,*\1)+', '\1');
This was in postgres 9.2
9.2.what? Tom just fixed a whole bunch of bugs in this area, so if
you're running less than 9.2.14, please test whether this can be
reproduced with that version.
I just tried this on 9.4.5 (stock Ubuntu 15.10 release), waited a minute
and killed the backend.
--
Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org)
To make changes to your subscription:
http://www.postgresql.org/mailpref/pgsql-hackers
