linux-kernel - Re: 2.6.26.3 mount process looping on ext3 rw remount

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Message-ID: <20080905113901.GA2756@torres.zugschlus.de>
Date:	Fri, 5 Sep 2008 13:39:02 +0200
From:	Marc Haber <mh+linux-kernel@...schlus.de>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: 2.6.26.3 mount process looping on ext3 rw remount

On Mon, Aug 25, 2008 at 06:35:28PM -0700, Andrew Morton wrote:
> Please try to get a kernel profile while it's happening.  oprofile
> maybe, or just the plain old timer-based profiler.  There's some info
> in Documentation/basic_profiling.txt.

I'll boot my next kernel with profile=2.

> Actually, a simple alternative is to hit sysrq-P five or ten times. 
> Most of the resulting stack traces will point back at where the CPU is
> stuck.

Where are they written to? "P" in a sysrqd telnet session does not
result in anything being written to the kernel log or to dmesg.

> This gets a bit hit-or-miss if you have multiple CPUs, because the
> sysrq-p trace can land on the wrong CPU.  We recently added a sysrq-l
> which will generate a trace on all CPUS.

"l" results in the SysRq HELP being written to the kernel log, so I
guess that "recently" means "not yet in 2.6.26.3".

Greetings
Marc

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