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

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Date:	Thu, 17 Jul 2008 10:13:33 -0400
From:	Josef Bacik <jbacik@...hat.com>
To:	Vegard Nossum <vegard.nossum@...il.com>
Cc:	Josef Bacik <jbacik@...hat.com>,
	Josef Bacik <josef@...icpanda.com>, linux-ext4@...r.kernel.org,
	sct@...hat.com, akpm@...ux-foundation.org, adilger@....com,
	Johannes Weiner <hannes@...urebad.de>,
	linux-kernel@...r.kernel.org
Subject: Re: ext3 on latest -git: BUG: unable to handle kernel NULL pointer
	dereference at 0000000c

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@...hat.com> 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@...hat.com>
> 
> 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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