linux-kernel - Re: XFS Bug null pointer dereference in xfs_free_ag

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Date:	Mon, 31 Jul 2006 16:41:28 +0800
From:	"Joe Jin" <lkmaillist@...il.com>
To:	kernel <linux@...center.cn>
Cc:	"Nathan Scott" <nathans@....com>, jdi@....org,
	linux-kernel@...r.kernel.org, rdunlap@...otime.net,
	wim.coekaerts@...cle.com
Subject: Re: XFS Bug null pointer dereference in xfs_free_ag_extent

At XFS have a debug option, but I wonder why why it was not opened,
and you may open the option with follow patch, rebuild kernel, you
maybe get more information of it.
And when I trace the code, I also found at some function should check
the return value, it also include the patch.
Hope help for you.



On 7/31/06, kernel <linux@...center.cn> wrote:
> I format the same partition and restart the testing server before each
> testing.
> I'vs tested on each format at least twenty times.
> With XFS and SAN, This crash happens on every bonnie++ testing.
>
> And I have tested such things on another mathine, results are same.
>
>
> Nathan Scott wrote:
> > On Mon, Jul 31, 2006 at 02:21:10PM +0800, kernel wrote:
> >
> >> Test again......very strange.
> >> I can easily reproduce it on the XFS with SAN(FLX380) connected with a
> >> qlogic 2400 FC card.
> >>
> >
> > Eggshellent... can you reproduce it with each of those changes
> > (below) backed out of your tree please?  Else, git bisect is our
> > next best bet.  Thanks!
> >
> >
> >>> Is this easily reproducible for you?  I've not seen it before, and
> >>> the only possibly related recent changes I can think of are these:
> >>>
> >>> http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=e63a3690013a475746ad2cea998ebb534d825704
> >>>
> >>> http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=d210a28cd851082cec9b282443f8cc0e6fc09830
> >>>
> >>> Could you try reverting each of those to see if either is the cause?
> >>>
> >
> > cheers.
> >
> >
> -
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-- 
Regards,
Joe.Jin

View attachment "xfs.patch" of type "text/x-patch" (1473 bytes)