2.6.17-rc5-mm3-lockdep - locking error in quotaon

[Valdis.Kletnieks@vt.edu]

Using the -lockdep patch that Ingo had a few days ago, plus Stefan Richter's
two patches for ieee1394 (which fixed the *first* locking issue I hit)....

[  219.535000] (         quotaon-1374 |#0): new 222056071 us user-latency.
[  219.535000] stopped custom tracer.
[  219.535000] 
[  219.535000] ======================================
[  219.535000] [ BUG: bad unlock ordering detected! ]
[  219.535000] --------------------------------------
[  219.535000] quotaon/1374 is trying to release lock (&inode->i_mutex) at:
[  219.535000]  [<c0382ba2>] mutex_unlock+0xd/0xf
[  219.535000] but the next lock to release is:
[  219.535000]  (&s->s_dquot.dqonoff_mutex){--..}, at: [<c0382a09>] mutex_lock+0xd/0xf
[  219.535000] 
[  219.535000] other info that might help us debug this:
[  219.535000] 2 locks held by quotaon/1374:
[  219.535000]  #0:  (&s->s_umount#16){----}, at: [<c016828f>] get_super+0x4a/0xd4
[  219.535000]  #1:  (&inode->i_mutex){--..}, at: [<c0382a09>] mutex_lock+0xd/0xf
[  219.535000] 
[  219.535000] stack backtrace:
[  219.535000]  [<c01032d6>] show_trace_log_lvl+0x64/0x125
[  219.535000]  [<c0103865>] show_trace+0x1b/0x20
[  219.535000]  [<c010391c>] dump_stack+0x1f/0x24
[  219.535000]  [<c012dee7>] lockdep_release+0x192/0x35e
[  219.535000]  [<c0382b53>] __mutex_unlock_slowpath+0x29/0x6b
[  219.535000]  [<c0382ba2>] mutex_unlock+0xd/0xf
[  219.535000]  [<c019243c>] vfs_quota_on_inode+0x35e/0x538
[  219.535000]  [<c019334b>] vfs_quota_on+0x55/0x6b
[  219.535000]  [<c01ac3f7>] ext3_quota_on+0x47/0xb6
[  219.535000]  [<c0195a11>] sys_quotactl+0x3b5/0x695
[  219.535000]  [<c03845b2>] sysenter_past_esp+0x63/0xa1

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