Christophe Pettus <> writes:
> Immediately after an upgrade from 9.3.1 to 9.3.2, we have a client getting 
> frequent (hourly) errors of the form:

> /var/lib/postgresql/9.3/main/pg_log/postgresql-2013-12-12_211710.csv:2013-12-12
>  21:40:10.328 
> UTC,"n","n",32376,"",52aa24eb.7e78,5,"SELECT",2013-12-12 
> 21:04:43 UTC,9/7178,0,PANIC,XX000,"stuck spinlock (0x7f7df94672f4) detected 
> at 
> /tmp/buildd/postgresql-9.3-9.3.2/build/../src/backend/storage/buffer/bufmgr.c:1099",,,,,,"<redacted>"

> uname -a: Linux postgresql3-master 3.8.0-33-generic #48~precise1-Ubuntu SMP 
> Thu Oct 24 16:28:06 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux.

> Generally, there's no core file (which is currently enable), as the 
> postmaster just normally exits the backend.

Hm, a PANIC really ought to result in a core file.  You sure you don't
have that disabled (perhaps via a ulimit setting)?

As for the root cause, it's hard to say.  The file/line number says it's
a buffer header lock that's stuck.  I rechecked all the places that lock
buffer headers, and all of them have very short code paths to the
corresponding unlock, so there's no obvious explanation how this could

                        regards, tom lane

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