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Re: backend hangs at immediate shutdown (Re: Back-branch update releases coming in a couple weeks)

From: "MauMau" <maumau307(at)gmail(dot)com>
To: "Peter Eisentraut" <peter_e(at)gmx(dot)net>
Cc: "Tom Lane" <tgl(at)sss(dot)pgh(dot)pa(dot)us>,<pgsql-hackers(at)postgreSQL(dot)org>
Subject: Re: backend hangs at immediate shutdown (Re: Back-branch update releases coming in a couple weeks)
Date: 2013-01-31 22:42:00
Message-ID: E8078033A39540499E6C152A326681AA@maumau (view raw or flat)
Thread:
Lists: pgsql-hackers
From: "Peter Eisentraut" <peter_e(at)gmx(dot)net>
> On 1/30/13 9:11 AM, MauMau wrote:
>> When I ran "pg_ctl stop -mi" against the primary, some applications
>> connected to the primary did not stop.  The cause was that the backends
>> was deadlocked in quickdie() with some call stack like the following.
>> I'm sorry to have left the stack trace file on the testing machine, so
>> I'll show you the precise stack trace tomorrow.
>
> I've had similar problems in the past:
>
> http://www.postgresql.org/message-id/1253704891.20834.8.camel@fsopti579.F-Secure.com
>
> The discussion there never quite concluded.  But yes, you need to be
> prepared that in rare circumstances SIGQUIT won't succeed and you need
> to use SIGKILL.

Thank you for sharing your experience.  So you also considered making 
postmaster SIGKILL children like me, didn't you?  I bet most of people who 
encounter this problem would feel like that.

It is definitely pg_ctl who needs to be prepared, not the users.  It may not 
be easy to find out postgres processes to SIGKILL if multiple instances are 
running on the same host.  Just doing "pkill postgres" will unexpectedly 
terminate postgres of other instances.

I would like to make a patch which that changes SIGQUIT to SIGKILL when 
postmaster terminates children.  Any other better ideas?

Regards
MauMau



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Subject: Re: backend hangs at immediate shutdown (Re: Back-branch update releases coming in a couple weeks)
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