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From: Richard Huxton <dev@archonet.com>
To: Russell Smith <mr-russ@pws.com.au>
Cc: Craig A. James <cjames@modgraph-usa.com>
Cc: pgsql-performance@postgresql.org
Subject: Re: Postgres server crash
Date: Thu, 16 Nov 2006 10:48:45 +0000
Message-ID: <455C420D.8090209@archonet.com> (raw)
In-Reply-To: <455BCCCD.2020701@pws.com.au>
References: <ce4072df0610201305u7836dc7bn437ec0aaf1c3e25f@mail.gmail.com>
	<b42b73150610201811m84369f7kc7d58b39aed3ad73@mail.gmail.com>
	<ce4072df0610230810t5d66bbb8xf1e9c0ed71b6b6c0@mail.gmail.com>
	<20061023215913.GW26892@nasby.net>
	<ce4072df0610240617s72f35540odd3d4e0903313b63@mail.gmail.com>
	<20061025001709.GA26892@nasby.net>
	<453EF7C4.2040105@modgraph-usa.com>
	<455BCAE8.8010905@modgraph-usa.com>
	<455BCCCD.2020701@pws.com.au>

Russell Smith wrote:
> Craig A. James wrote:
>> Questions:
>>  1. Any idea what happened and how I can avoid this?  It's a *big* 
>> problem.
>>  2. Why didn't the database recover?  Why are there two processes
>>     that couldn't be killed?

I'm guessing it didn't recover *because* there were two processes that 
couldn't be killed. Responsibility for that falls to the 
operating-system. I've seen it most often with faulty drivers or 
hardware that's being communicated with/written to. However, see below.

>>  3. Where did the "signal 9" come from?  (Nobody but me ever logs
>>     in to the server machine.)
>>
> I would guess it's the linux OOM if you are running linux. 

If not, it means the server is hacked or haunted. Something outside PG 
issued a kill -9 and the OOM killer is the prime suspect I'd say.

-- 
   Richard Huxton
   Archonet Ltd



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