linux-kernel - Re: kernel BUG at fs/btrfs/disk-io.c:2221!

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Date:	Mon, 3 Aug 2009 10:02:23 -0400
From:	Chris Mason <chris.mason@...cle.com>
To:	Thomas Meyer <thomas@...3r.de>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: kernel BUG at fs/btrfs/disk-io.c:2221!

On Sat, Aug 01, 2009 at 11:50:08AM +0200, Thomas Meyer wrote:
> kernel BUG at fs/btrfs/disk-io.c:2221! 
> invalid opcode: 0000 [#1] PREEMPT SMP 
> last sysfs file: /sys/block/sdc/sdc1/start

Could you please confirm that line 2221 in your disk-io.c looks like
this:

2219 int btrfs_free_fs_root(struct btrfs_fs_info *fs_info, struct
btrfs_root *root)
2220 {
2221         WARN_ON(!RB_EMPTY_ROOT(&root->inode_tree));
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
2222         radix_tree_delete(&fs_info->fs_roots_radix,
2223                           (unsigned long)root->root_key.objectid);
2224         if (root->anon_super.s_dev) {
2225                 down_write(&root->anon_super.s_umount);
2226                 kill_anon_super(&root->anon_super);
2227         }

That's in the unmount path but not under write_ctree_supers, so I want
to make sure I'm looking at the right bug ;)

-chris

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