linux-kernel - Re: 2.6.33.3-rt16 Oops caused by umount

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Message-ID: <alpine.LFD.2.00.1004282218470.2951@localhost.localdomain>
Date:	Wed, 28 Apr 2010 22:22:11 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Xianghua Xiao <xiaoxianghua@...il.com>
cc:	john stultz <johnstul@...ibm.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: 2.6.33.3-rt16 Oops caused by umount

On Wed, 28 Apr 2010, Xianghua Xiao wrote:
> On Wed, Apr 28, 2010 at 2:38 PM, Thomas Gleixner <tglx@...utronix.de> wrote:
> > On Wed, 28 Apr 2010, Xianghua Xiao wrote:
> >> Thomas,
> >> I patched it and re-run it however did not find any condition from
> >> your patch had a hit.
> >> In your patch I changed :
> >>
> >> if (!file->f_path) {
> >> to
> >> if(!(&(file->f_path))){
> >> Otherwise it won't compile as f_path is a not a pointer.
> >
> > True :)
> >
> >> # reboot
> >> # Oops: Kernel access of bad area, sig: 11 [#1]
> >
> > Ok. Can you please enable CONFIG_DEBUG_LIST ?
> >
> > Thanks,
> >
> >        tglx
> >
> I turned on that, could not find any difference from the oops log.
> If I try to remount it rw then ro, the remount ro will cause similar oops
> Thanks,
> Xianghua
> 
> # reboot
> # Oops: Kernel access of bad area, sig: 11 [#1]
> PREEMPT 834x SYS
> Modules linked in:
> NIP: c009ca1c LR: c009c9cc CTR: 00000000

Can you please decode the code lines with 

# addr2line -e vmlinux 0xc009ca1c 0xc009c9cc

You need to enable CONFIG_DEBUG_INFO to get real line numbers.

Thanks,

	tglx