linux-kernel - Re: [Bugme-new] [Bug 10586] New: High Number of Segfaults onMacBookStarting With 2.6.24.5 Kernel

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Message-Id: <20080502061018.5557d067.akpm@linux-foundation.org>
Date:	Fri, 2 May 2008 06:10:18 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Phil Oester <kernel@...uxace.com>
Cc:	Ryan Roth <ryanroth@...global.net>, Ryan.Roth@...M.com,
	bugme-daemon@...zilla.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [Bugme-new] [Bug 10586] New: High Number of Segfaults
 onMacBookStarting With 2.6.24.5 Kernel

On Fri, 2 May 2008 05:19:45 -0700 Phil Oester <kernel@...uxace.com> wrote:

> On Thu, May 01, 2008 at 07:28:38PM -0700, Andrew Morton wrote:
> > On Thu, 1 May 2008 19:08:15 -0700 Phil Oester <kernel@...uxace.com> wrote:
> > 
> > > FWIW, I recently upgraded some boxes to 2.6.24.x, and started seeing tons of
> > > qmail segfaults, which look remarkably similar to the above problem.  2.6.21
> > > did not exhibit this issue.
> > > 
> > > May  1 22:06:03 mail80 kernel: qmail-smtpd[5319]: segfault at 0 ip 4884b473 sp fffeec1c error 4 in libc-2.6.so[487dd000+14e000]
> > > May  1 22:06:03 mail80 kernel: qmail-smtpd[5491]: segfault at 0 ip 4884b473 sp ffb7179c error 4 in libc-2.6.so[487dd000+14e000]
> > > May  1 22:06:03 mail80 kernel: qmail-smtpd[4669]: segfault at 0 ip 4884b473 sp fff3135c error 4 in libc-2.6.so[487dd000+14e000]
> > > May  1 22:06:05 mail80 kernel: qmail-smtpd[5906]: segfault at 0 ip 4884b473 sp ffe1b24c error 4 in libc-2.6.so[487dd000+14e000]
> > > May  1 22:06:07 mail80 kernel: qmail-smtpd[5898]: segfault at 0 ip 4884b473 sp ffe4e27c error 4 in libc-2.6.so[487dd000+14e000]
> > > May  1 22:06:11 mail80 kernel: qmail-smtpd[5840]: segfault at 0 ip 4884b473 sp ffe04a2c error 4 in libc-2.6.so[487dd000+14e000]
> > > 
> > 
> > Can you try fiddling with the norandmaps boot option and
> > /proc/sys/kernel/randomize_va_space?
> 
> echo 0 > /proc/sys/kernel/randomize_va_space does not make any difference (and
> is equivalent to norandmaps boot option according to docs).
> 
> Unless you have other ideas, I can try to bisect this later today.

No, I can't suggest anything else to try, sorry.

Traditionally i386 never printed that message (in fact neither architecture
should - it allows poeple to spam the logs, but it is at least
ratelimited).

In 2.6.23, i386 _does_ generate that message, in arch/i386/mm/fault.c

In 2.6.24 the i386 and x86_64 fault handlers were renamed to
arch/x86/mm/fault_[32|64].c and both versions generated the message.

In 2.6.25 they were unified into a single arch/x86/mm/fault.c, and both
architectures print the message.

So afacit 2.6.23 _should_ be printing the message if qmail is indeed
generating a segfault.  But there's always the possibility that the
message-printing code was simply broken in 2.6.23, and that your qmail has
always been generating segfaults.

Are any other problems observeable?  Does qmail continue to operate
normally in 2.6.24?

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