Re: ext3 on latest -git: BUG: unable to handle kernel NULL pointerdereference at 0000000c

From: Josef Bacik
Date: Thu Jul 17 2008 - 10:33:42 EST


On Thu, Jul 17, 2008 at 04:25:49PM +0200, Vegard Nossum wrote:
> On Thu, Jul 17, 2008 at 3:57 PM, Josef Bacik <jbacik@xxxxxxxxxx> wrote:
> > Can you try this patch out and see if it fixes the problem? I didn't compile
> > test it, so you may need to tweak somethings, but it should work. Thanks,
> >
> > Signed-off-by: Josef Bacik <jbacik@xxxxxxxxxx>
>
> Nope, seems to be the same problem:
>
> kjournald starting. Commit interval 5 seconds
> EXT3-fs warning: mounting fs with errors, running e2fsck is recommended
> EXT3 FS on loop0, internal journal
> EXT3-fs: mounted filesystem with ordered data mode.
> EXT3-fs error (device loop0): ext3_free_blocks: Freeing blocks in
> system zones - Block = 16, count = 1
> EXT3-fs error (device loop0): ext3_free_blocks: Freeing blocks in
> system zones - Block = 32, count = 1
> EXT3-fs error (device loop0): ext3_free_blocks: Freeing blocks not in
> datazone - block = 262144, count = 1
> BUG: unable to handle kernel NULL pointer dereference at 0000000c
> IP: [<c01fd210>] journal_dirty_metadata+0xa0/0x160
>
> Full log at http://folk.uio.no/vegardno/linux/log-1216304953.txt
>
>

Ok, this should do it then. Thanks,

Josef


Index: linux-2.6/fs/ext3/inode.c
===================================================================
--- linux-2.6.orig/fs/ext3/inode.c
+++ linux-2.6/fs/ext3/inode.c
@@ -2023,13 +2023,27 @@ static void ext3_clear_blocks(handle_t *
unsigned long count, __le32 *first, __le32 *last)
{
__le32 *p;
+ int ret;
+
if (try_to_extend_transaction(handle, inode)) {
if (bh) {
BUFFER_TRACE(bh, "call ext3_journal_dirty_metadata");
- ext3_journal_dirty_metadata(handle, bh);
+ ret = ext3_journal_dirty_metadata(handle, bh);
+ if (ret) {
+ ext3_std_error(inode->i_sb, ret);
+ return;
+ }
}
- ext3_mark_inode_dirty(handle, inode);
- ext3_journal_test_restart(handle, inode);
+ ret = ext3_mark_inode_dirty(handle, inode);
+ if (ret)
+ return;
+
+ ret = ext3_journal_test_restart(handle, inode);
+ if (ret) {
+ ext3_std_error(inode->i_sb, ret);
+ return;
+ }
+
if (bh) {
BUFFER_TRACE(bh, "retaking write access");
ext3_journal_get_write_access(handle, bh);
Index: linux-2.6/fs/ext3/balloc.c
===================================================================
--- linux-2.6.orig/fs/ext3/balloc.c
+++ linux-2.6/fs/ext3/balloc.c
@@ -498,6 +498,7 @@ void ext3_free_blocks_sb(handle_t *handl
ext3_error (sb, "ext3_free_blocks",
"Freeing blocks not in datazone - "
"block = "E3FSBLK", count = %lu", block, count);
+ err = -EIO;
goto error_return;
}

@@ -535,6 +536,7 @@ do_more:
"Freeing blocks in system zones - "
"Block = "E3FSBLK", count = %lu",
block, count);
+ err = -EIO;
goto error_return;
}

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