Got a warning from the lock validating check again and
later a unresponsive lockd with a backtrace this time
actually at the same place the lock warning was on.
[68078.860233] =======================
[68078.860276] lockd D E4433CD0 5432 2445 2 (L-TLB)
[68078.860419] e4433cf0 00000046 e4433df4 e4433cd0 c0335db3 00000000 3b9ab342 8c0cfa96
[68078.860701] 00002591 8c0cfa96 00002591 0000e375 00000073 ecdb0ba0 0000576f 00000000
[68078.861019] 00000002 c051fc58 e31fea04 00000246 ecdb0a90 e4433d2c c03b7030 00000000
[68078.861337] Call Trace:
[68078.861414] [<c03b7030>] __mutex_lock_slowpath+0xa0/0x290
[68078.861490] [<c03b723c>] mutex_lock+0x1c/0x20
[68078.861565] [<c02411c9>] nlmsvc_traverse_blocks+0x29/0xa0
[68078.861647] [<c02425fe>] nlm_traverse_files+0x6e/0x210
[68078.861723] [<c024282b>] nlmsvc_mark_resources+0x1b/0x30
[68078.861799] [<c023f02e>] nlm_gc_hosts+0x4e/0x1e0
[68078.861874] [<c023f576>] nlm_lookup_host+0x46/0x310
[68078.861950] [<c023f874>] nlmsvc_lookup_host+0x34/0x40
[68078.862026] [<c02414b5>] nlmsvc_lock+0x125/0x360
[68078.862100] [<c024562c>] nlm4svc_proc_lock+0x7c/0x110
[68078.862178] [<c03a4740>] svc_process+0x680/0x730
[68078.862257] [<c0240166>] lockd+0x106/0x240
[68078.862331] [<c0104b43>] kernel_thread_helper+0x7/0x14
[68078.862407] =======================
[21409.476505] =======================================================
[21409.476599] [ INFO: possible circular locking dependency detected ]
[21409.476646] 2.6.22.3 #7
[21409.476688] -------------------------------------------------------
[21409.476735] lockd/2445 is trying to acquire lock:
[21409.476781] (&file->f_mutex){--..}, at: [<c03b723c>] mutex_lock+0x1c/0x20
[21409.476951]
[21409.476952] but task is already holding lock:
[21409.477034] (nlm_host_mutex){--..}, at: [<c03b723c>] mutex_lock+0x1c/0x20
[21409.477198]
[21409.477199] which lock already depends on the new lock.
[21409.477201]
[21409.477321]
[21409.477322] the existing dependency chain (in reverse order) is:
[21409.477405]
[21409.477406] -> #1 (nlm_host_mutex){--..}:
[21409.477574] [<c0135d4d>] __lock_acquire+0xdad/0xf60
[21409.477853] [<c0135f55>] lock_acquire+0x55/0x70
[21409.478128] [<c03b6ff9>] __mutex_lock_slowpath+0x69/0x290
[21409.478405] [<c03b723c>] mutex_lock+0x1c/0x20
[21409.478680] [<c023f561>] nlm_lookup_host+0x31/0x310
[21409.478961] [<c023f874>] nlmsvc_lookup_host+0x34/0x40
[21409.479238] [<c02414b5>] nlmsvc_lock+0x125/0x360
[21409.479513] [<c024562c>] nlm4svc_proc_lock+0x7c/0x110
[21409.479792] [<c03a4740>] svc_process+0x680/0x730
[21409.480071] [<c0240166>] lockd+0x106/0x240
[21409.480347] [<c0104b43>] kernel_thread_helper+0x7/0x14
[21409.480625] [<ffffffff>] 0xffffffff
[21409.480904]
[21409.480905] -> #0 (&file->f_mutex){--..}:
[21409.481072] [<c0135bc7>] __lock_acquire+0xc27/0xf60
[21409.481348] [<c0135f55>] lock_acquire+0x55/0x70
[21409.481623] [<c03b6ff9>] __mutex_lock_slowpath+0x69/0x290
[21409.481900] [<c03b723c>] mutex_lock+0x1c/0x20
[21409.482175] [<c02411c9>] nlmsvc_traverse_blocks+0x29/0xa0
[21409.482453] [<c02425fe>] nlm_traverse_files+0x6e/0x210
[21409.482729] [<c024282b>] nlmsvc_mark_resources+0x1b/0x30
[21409.483005] [<c023f02e>] nlm_gc_hosts+0x4e/0x1e0
[21409.483281] [<c023f576>] nlm_lookup_host+0x46/0x310
[21409.483558] [<c023f874>] nlmsvc_lookup_host+0x34/0x40
[21409.483834] [<c024506b>] nlm4svc_retrieve_args+0x3b/0xd0
[21409.484111] [<c0245607>] nlm4svc_proc_lock+0x57/0x110
[21409.484387] [<c03a4740>] svc_process+0x680/0x730
[21409.484663] [<c0240166>] lockd+0x106/0x240
[21409.484938] [<c0104b43>] kernel_thread_helper+0x7/0x14
[21409.485215] [<ffffffff>] 0xffffffff
[21409.485488]
[21409.485489] other info that might help us debug this:
[21409.485491]
[21409.485611] 1 lock held by lockd/2445:
[21409.485654] #0: (nlm_host_mutex){--..}, at: [<c03b723c>] mutex_lock+0x1c/0x20
[21409.485855]
[21409.485856] stack backtrace:
[21409.485937] [<c0104eca>] show_trace_log_lvl+0x1a/0x30
[21409.486012] [<c0105a02>] show_trace+0x12/0x20
[21409.486087] [<c0105a75>] dump_stack+0x15/0x20
[21409.486161] [<c0133d6c>] print_circular_bug_tail+0x6c/0x80
[21409.486237] [<c0135bc7>] __lock_acquire+0xc27/0xf60
[21409.486312] [<c0135f55>] lock_acquire+0x55/0x70
[21409.486386] [<c03b6ff9>] __mutex_lock_slowpath+0x69/0x290
[21409.486462] [<c03b723c>] mutex_lock+0x1c/0x20
[21409.487052] [<c02411c9>] nlmsvc_traverse_blocks+0x29/0xa0
[21409.487129] [<c02425fe>] nlm_traverse_files+0x6e/0x210
[21409.487204] [<c024282b>] nlmsvc_mark_resources+0x1b/0x30
[21409.487279] [<c023f02e>] nlm_gc_hosts+0x4e/0x1e0
[21409.487354] [<c023f576>] nlm_lookup_host+0x46/0x310
[21409.487430] [<c023f874>] nlmsvc_lookup_host+0x34/0x40
[21409.487505] [<c024506b>] nlm4svc_retrieve_args+0x3b/0xd0
[21409.487581] [<c0245607>] nlm4svc_proc_lock+0x57/0x110
[21409.487656] [<c03a4740>] svc_process+0x680/0x730
[21409.487731] [<c0240166>] lockd+0x106/0x240
[21409.487805] [<c0104b43>] kernel_thread_helper+0x7/0x14
[21409.487880] =======================
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On Wed, 12 Sep 2007 07:26:02 +0000 (UTC)
kenneth johansson <[email protected]> wrote:
> Got a warning from the lock validating check again and
> later a unresponsive lockd with a backtrace this time
> actually at the same place the lock warning was on.
FWIW, I think I ran into the exact same problem recently. I opened a
BZ case for it so I wouldn't forget about it, but haven't had time to
track it down:
https://bugzilla.redhat.com/show_bug.cgi?id=280311
I'm not certain that lockd was stuck at the time, since I had some
other things going on with the box, but it may have been...
--
Jeff Layton <[email protected]>
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