Does this patch eliminate the problem?
Unfortunately I can not generate this error again because after
re-formatting the memory (mkfs.nilfs2) the problem disappeared.
Łukasz Wójcicki
Dnia 2010-07-07, śro o godzinie 15:02 +0900, Ryusuke Konishi pisze:
> Hi,
>
> On Tue, 06 Jul 2010 11:02:41 +0200, Łukasz_Wójcicki wrote:
> > I'am using kernel 2.6.20 with nilf_utils-2-0-18 and nilfs kernel module
> > 2-0-20 .
> >
> > <1>Unable to handle kernel NULL pointer dereference at virtual address
> > 00000000
> > <1>pgd = c4eb0000
> > <1>[00000000] *pgd=c4e2d031, *pte=00000000, *ppte=00000000
> > <4>Internal error: Oops: 17 [#1]
> > <4>Modules linked in:
> > <4>CPU: 0
> > <4>PC is at nilfs_btree_lookup_dirty_buffers+0x10c/0x1ec
> > <4>LR is at 0xc4c99b24
> <snip>
>
> Could you try the following patch to narrow down the cause?
>
> There is a function lacking range check in the btree code. This patch
> will catch the defect if the oops comes from a range error.
>
> I'm now reviewing the btree code to find out root cause of the range
> error.
>
> Thanks,
> Ryusuke Konishi
> ---
>
> diff --git a/fs/btree.c b/fs/btree.c
> index beb11fe..9622ff4 100644
> --- a/fs/btree.c
> +++ b/fs/btree.c
> @@ -2007,6 +2007,15 @@ static void nilfs_btree_add_dirty_buffer(struct
> nilfs_btree *btree,
> node = (struct nilfs_btree_node *)bh->b_data;
> key = nilfs_btree_node_get_key(node, 0);
> level = nilfs_btree_node_get_level(node);
> + if (level < NILFS_BTREE_LEVEL_NODE_MIN ||
> + level >= NILFS_BTREE_LEVEL_MAX) {
> + dump_stack();
> + printk(KERN_CRIT
> + "%s: invalid btree level: %d (ino=%lu)\n", __func__,
> + level, NILFS_BMAP_I(&btree->bt_bmap)->vfs_inode.i_ino);
> + return;
> + }
> +
> list_for_each(head, &lists[level]) {
> cbh = list_entry(head, struct buffer_head, b_assoc_buffers);
> cnode = (struct nilfs_btree_node *)cbh->b_data;
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