linux-kernel - Re: [next-20101038] Call trace in ext4

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Date:	Thu, 28 Oct 2010 22:15:00 +0200
From:	Sedat Dilek <sedat.dilek@...glemail.com>
To:	"Ted Ts'o" <tytso@....edu>, sedat.dilek@...il.com,
	Markus Trippelsdorf <markus@...ppelsdorf.de>,
	LKML <linux-kernel@...r.kernel.org>, linux-ext4@...r.kernel.org,
	sfr@...b.auug.org.au, Arnd Bergmann <arnd@...db.de>,
	Avinash Kurup <kurup.avinash@...il.com>
Subject: Re: [next-20101038] Call trace in ext4

On Thu, Oct 28, 2010 at 10:05 PM, Ted Ts'o <tytso@....edu> wrote:
> On Thu, Oct 28, 2010 at 09:54:23PM +0200, Sedat Dilek wrote:
>>
>> Hm, unfortunately NO (see logs).
>>
>> I have compiled via M=fs/ext4 in an already compiled build-tree with
>> these 3 patches.
>
> Ok, stupid question.  You did make sure the new ext4 module was
> loaded, right?
>
>> [  100.884524] ------------[ cut here ]------------
>> [  100.884718] kernel BUG at /home/sd/src/linux-2.6/linux-2.6.36/debian/build/source_i386_none/fs/ext4/inode.c:2721!
>
> OK, so after the patch, line 2721: changed from page_buffers() to:
>
>    if (!page_has_buffers(page))
>
> page_has_buffers() expands to:
>
> #define page_has_buffers(page)  PagePrivate(page)
>
> which expands to test_bit() call to see if PG_private1 is set in
> page->flags.  There is no BUG_ON anywhere there as far as I can tell.
>
> Line 2721 in the older kernel was page_has_buffers() which does have a
> BUG_ON check.
>
>                                        - Ted
>

I created a new ext4.ko via "make M=fs/ext4" in the build-dir and
copied the the kernel-module to /lib/modules/$(uname
-r)/kernel/fs/ext4/, is that not enough?
If not, I have to recompile a new kernel.

- Sedat -
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