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Re: BUG: unable to handle kernel NULL pointer dereference at 00000048



Luckily, I seem to have been able to reproduce the bug (after
shrinking the partition down to some hundred MB). Your patch seems to
have fixed it!

Now I get the following, which, I think, is pretty much expected,
since I chopped a large part of the filesystem off:

15:52 root ~ # mount /dev/1/buggy-home test
[  461.137823] NILFS: error searching super root.
mount.nilfs2: Error while mounting /dev/mapper/1-buggy--home on
/root/test: Input/output error

Please, fix the bug in the official kernel sources, too. Your
filesystem proved very useful here for storing documents and other
changeable stuff -- we don't want it get broken unexpectedly. :)

Still, thanks a lot! The things you are doing here are really cool!

Cheers!



On Mon, Mar 5, 2012 at 5:30 PM, Ryusuke Konishi
<konishi.ryusuke@xxxxxxxxxxxxx> wrote:
>
> Thank you for reporting this issue.
>
> I found a bug in the nilfs_load_super_block function which has
> potential to cause this oops.
>
> Could you try the following patch if you still have the partition ?
>
>
> Thanks,
> Ryusuke Konishi
>
> diff --git a/fs/nilfs2/the_nilfs.c b/fs/nilfs2/the_nilfs.c
> index d327140..35a8970 100644
> --- a/fs/nilfs2/the_nilfs.c
> +++ b/fs/nilfs2/the_nilfs.c
> @@ -515,6 +515,7 @@ static int nilfs_load_super_block(struct the_nilfs *nilfs,
>                brelse(sbh[1]);
>                sbh[1] = NULL;
>                sbp[1] = NULL;
> +               valid[1] = 0;
>                swp = 0;
>        }
>        if (!valid[swp]) {
> --
> 1.7.7.4
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