Re: diagnosing a db crash - server exit code 2

[Robert Burgholzer <rburghol@xxxxxx>]

FWIW - I am currently trying this while tracing the process that I assume is the postmaster (/usr/bin/postgres -D /home/postgres/data), since this process number indicates that it was recently restarted - although the other PG processes, writer, wal writer, autovacuum, stats collector all have their older pids indicating that they still survive.

regards,

r.b.

On Mon, Oct 3, 2011 at 12:54 PM, Burgholzer, Robert (DEQ) <Robert.Burgholzer@xxxxxxxxxxxxxxxx> wrote:

OK,
So I have upgraded to the latest plR, and restarted my PG backend and
reloaded my PG functions that call R/PlR.  I am still able to make the
process crash by running my R functions.  When trying to obtain the
stack trace, however, I notice that it appears as if the process that is
CAUSING the crash, is not SUFFERING the crash, as per this message while
executing the offending SQL/pLR.  I have my PHP process running in the
background, making no R calls but involving heavy traffic on the PG
server, and I opened up a psql console and executed the troublesome
command (a large quantile call) - then I ran a trace on the psql console
session, and got the following at the PG command line while waiting for
the query to finish:

<psql>
server closed the connection unexpectedly
       This probably means the server terminated abnormally
       before or while processing the request.
The connection to the server was lost. Attempting reset: Failed.
</psql>

This is backed up by the debuglog.txt giving me no feedback:

<debuglog.txt>
Continuing.
Program exited normally.
</debuglog.txt>

Is it even possible that something like this is happening -- i.e.,
calling R from a different process kills another backend? How do I
figure out which process to watch?

Thanks,
r.b.

Robert W. Burgholzer
Surface Water Modeler
Office of Water Supply and Planning
Virginia Department of Environmental Quality
rwburgholzer@xxxxxxxxxxxxxxxx
804-698-4405
Open Source Modeling Tools:
http://sourceforge.net/projects/npsource/

-----Original Message-----
From: Joe Conway [mailto:mail@xxxxxxxxxxxxx]
Sent: Thursday, September 29, 2011 1:30 PM
To: Robert Burgholzer
Cc: Burgholzer, Robert (DEQ); Scott Marlowe; pgsql-admin@xxxxxxxxxxxxxx
Subject: Re: diagnosing a db crash - server exit code 2

On 09/28/2011 12:54 PM, Robert Burgholzer wrote:
> Just a quick checkin on this problem.  Thus far, I have managed to
> install dbg and recompile postgresql with the appropriate debugging
> headers/variables.

I might have missed it, but are you already running the latest version
of PL/R (8.3.0.13)?

Joe


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