Excerpts from Robert Haas's message of lun jul 25 11:20:55 -0400 2011:
> On Sun, Jul 24, 2011 at 5:06 PM, noordsij <noord...@cs.helsinki.fi> wrote:
> >> Any idea what query triggered this?
> >
> > Only up to which stored procedure (which itself contains multiple
> > statements).
> 
> If you provide a reproducible test case, we can probably get this fixed.
> 
> Otherwise, we probably can't.

But why is libxml calling pthread_mutex_lock and such?  Unless libxml is
making itself multithread inside a backend, that shouldn't matter --
much less cause a crash.

Note (to the OP) that it's totally unexpected to have a Postgres backend
become multithreaded, and has been shown to be dangerous when a library
made it so.

-- 
Álvaro Herrera <alvhe...@commandprompt.com>
The PostgreSQL Company - Command Prompt, Inc.
PostgreSQL Replication, Consulting, Custom Development, 24x7 support

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