linux-kernel - Re: 2.6.23-rc7-mm1

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Date:	Tue, 25 Sep 2007 00:52:30 +1000
From:	Reuben Farrelly <reuben-linuxkernel@...b.net>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	linux-kernel@...r.kernel.org
Subject: Re: 2.6.23-rc7-mm1

On 24/09/2007 7:17 PM, Andrew Morton wrote:
> ftp://ftp.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.23-rc7/2.6.23-rc7-mm1/
> 
> - New git tree git-powerpc-galak.patch added to the -mm lineup: ppc32
>   things, mainly (Kumar Gala <galak@...e.crashing.org>)

I'm observing a problem with this kernel (as well as 2.6.23-rc6-mm1) which 
manifests itself only in my Postfix/application mail.logs:

Sep 25 00:25:40 tornado postfix/smtp[12520]: fatal: select lock: Cannot allocate 
memory
Sep 25 00:25:41 tornado postfix/master[8002]: warning: process 
/usr/lib64/postfix/smtp pid 12520 exit status 1

This is happening frequently with processes started via 'master' (smtp, smtpd 
and cleanup), but it does not appear to have any noticeable operational impact 
apart from logging a lot of copies of this message.

The corresponding code in Postfix which triggers this is (choice of 3 files in 
src/master are all possibilities which all have much the same code)

     /*
      * The event loop, at last.
      */
     while (var_use_limit == 0 || use_count < var_use_limit || client_count > 0) {
         if (multi_server_lock != 0) {
             watchdog_stop(watchdog);
             if (myflock(vstream_fileno(multi_server_lock), INTERNAL_LOCK,
                         MYFLOCK_OP_EXCLUSIVE) < 0)
                 msg_fatal("select lock: %m");
         }
         watchdog_start(watchdog);
         delay = loop ? loop(multi_server_name, multi_server_argv) : -1;
         event_loop(delay);
     }
     multi_server_exit();
}

Now I'm not convinced this is an application problem, because I'm only seeing 
this after running up kernel 2.6.23-rc6-mm1 or 2.6.23-rc7-mm1 and with NO 
changes to the application itself.  Using the same application binaries it does 
not occur with 2.6.22 mainline.  [I didn't get a lot of testing with the -mm 
release prior to that unfortunately due to some other breakage.]

Is there anything new in the last two or so -mm kernels which could have caused 
this?

I've put my .config up at http://www.reub.net/files/kernel/2.6.23-rc7-mm1.config

Thanks,
Reuben
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