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Subject2.6.29-git: cannot mount ext4/loop
Hi Theodore, Jens

kernel is 2.6.29-07099-g8b53ef3

Mount failed:

EXT4-fs: barriers enabled
kjournald2 starting: pid 1867, dev loop0:8, commit interval 5 seconds
EXT4-fs error (device loop0): ext4_iget: block reference 2703228928 >=
max (524288) in inode #2, offset=0
EXT4-fs: get root inode failed
EXT4-fs (device loop0): mount failed

[ BUG: bad unlock balance detected! ]
mount/1865 is trying to release lock (&lo->lo_ctl_mutex) at:
[<00000000006fa1c0>] mutex_unlock+0x10/0x20
but there are no more locks to release!

other info that might help us debug this:
1 lock held by mount/1865:
#0: (&bdev->bd_mutex){+.+.+.}, at: [<00000000004dd570>]

stack backtrace:
Call Trace:
[0000000000477538] print_unlock_inbalance_bug+0xe8/0xf8
[0000000000477624] lock_release_non_nested+0xdc/0x290
[0000000000477984] lock_release+0x1ac/0x1d8
[00000000006fa120] __mutex_unlock_slowpath+0xe8/0x178
[00000000006fa1c0] mutex_unlock+0x10/0x20
[0000000000621e38] lo_release+0x70/0x80
[00000000004dd5fc] __blkdev_put+0xa8/0x14c
[00000000004dd6b8] blkdev_put+0x18/0x2c
[00000000004dd704] blkdev_close+0x38/0x4c
[00000000004b6f0c] __fput+0xfc/0x1e4
[00000000004b701c] fput+0x28/0x38
[00000000004b4198] filp_close+0x74/0x88
[00000000004529e0] put_files_struct+0x9c/0xfc
[0000000000452a70] exit_files+0x30/0x40
[000000000045406c] do_exit+0x160/0x734
[00000000004546cc] do_group_exit+0x8c/0xc4

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