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Date: Thu, 4 Mar 2010 21:06:15 +0100
From: John Kacur <jkacur@...hat.com>
To: LKML <linux-kernel@...r.kernel.org>
Subject: [BUG REPORT] mdadm INFO: possible circular locking dependency
detected
I spotted the following in my logs. This occurred on a real-time
kernel (2.6.33-rt4), but I suspect that there is nothing rt about it
and that it could just as easily happen on a vanilla kernel.
If anyone would like more information, I am happy to provide it. Thanks
Mar 4 19:30:40 localhost kernel:
=======================================================
Mar 4 19:30:40 localhost kernel: [ INFO: possible circular locking
dependency detected ]
Mar 4 19:30:40 localhost kernel: 2.6.33-rt4 #1
Mar 4 19:30:40 localhost kernel:
-------------------------------------------------------
Mar 4 19:30:40 localhost kernel: mdadm/689 is trying to acquire lock:
Mar 4 19:30:40 localhost kernel: (&bdev->bd_mutex){+.+.+.}, at:
[<ffffffff8113d933>] bd_claim_by_disk+0xef/0x272
Mar 4 19:30:40 localhost kernel:
Mar 4 19:30:40 localhost kernel: but task is already holding lock:
Mar 4 19:30:40 localhost kernel: (&new->reconfig_mutex){+.+.+.}, at:
[<ffffffff81366490>] mddev_lock+0x15/0x17
Mar 4 19:30:40 localhost kernel:
Mar 4 19:30:40 localhost kernel: which lock already depends on the new lock.
Mar 4 19:30:40 localhost kernel:
Mar 4 19:30:40 localhost kernel:
Mar 4 19:30:40 localhost kernel: the existing dependency chain (in
reverse order) is:
Mar 4 19:30:40 localhost kernel:
Mar 4 19:30:40 localhost kernel: -> #3 (&new->reconfig_mutex){+.+.+.}:
Mar 4 19:30:40 localhost kernel: [<ffffffff8107d132>]
__lock_acquire+0xb66/0xd1e
Mar 4 19:30:40 localhost kernel: [<ffffffff8107d3cb>]
lock_acquire+0xe1/0x105
Mar 4 19:30:40 localhost kernel: [<ffffffff81457f33>]
_mutex_lock_interruptible+0x39/0x67
Mar 4 19:30:40 localhost kernel: [<ffffffff81366490>]
mddev_lock+0x15/0x17
Mar 4 19:30:40 localhost kernel: [<ffffffff81366e20>]
md_attr_show+0x32/0x5d
Mar 4 19:30:40 localhost kernel: [<ffffffff8116ed8c>]
sysfs_read_file+0xbb/0x17d
Mar 4 19:30:40 localhost kernel: [<ffffffff8111748c>] vfs_read+0xae/0x10b
Mar 4 19:30:40 localhost kernel: [<ffffffff811175af>] sys_read+0x4d/0x74
Mar 4 19:30:40 localhost kernel: [<ffffffff81009d72>]
system_call_fastpath+0x16/0x1b
Mar 4 19:30:40 localhost kernel:
Mar 4 19:30:40 localhost kernel: -> #2 (s_active){++++.+}:
Mar 4 19:30:40 localhost kernel: [<ffffffff8107d132>]
__lock_acquire+0xb66/0xd1e
Mar 4 19:30:40 localhost kernel: [<ffffffff8107d3cb>]
lock_acquire+0xe1/0x105
Mar 4 19:30:40 localhost kernel: [<ffffffff8116f989>]
sysfs_deactivate+0x91/0xce
Mar 4 19:30:40 localhost kernel: [<ffffffff81170074>]
sysfs_addrm_finish+0x36/0x55
Mar 4 19:30:40 localhost kernel: [<ffffffff811700c9>]
remove_dir+0x36/0x3e
Mar 4 19:30:40 localhost kernel: [<ffffffff8117017e>]
sysfs_remove_dir+0x9d/0xbe
Mar 4 19:30:40 localhost kernel: [<ffffffff8121fe9b>]
kobject_del+0x16/0x37
Mar 4 19:30:40 localhost kernel: [<ffffffff8121ff83>]
kobject_release+0xc7/0x1d9
Mar 4 19:30:40 localhost kernel: [<ffffffff812210bd>] kref_put+0x43/0x4d
Mar 4 19:30:40 localhost kernel: [<ffffffff8121fe10>]
kobject_put+0x47/0x4b
Mar 4 19:30:40 localhost kernel: [<ffffffff8116b501>]
delete_partition+0x55/0x79
Mar 4 19:30:40 localhost kernel: [<ffffffff81213f49>]
blkpg_ioctl+0x231/0x27f
Mar 4 19:30:40 localhost kernel: [<ffffffff812144f1>]
blkdev_ioctl+0x55a/0x6b1
Mar 4 19:30:40 localhost kernel: [<ffffffff8113d34b>]
block_ioctl+0x3d/0x41
Mar 4 19:30:40 localhost kernel: [<ffffffff81123cf8>] vfs_ioctl+0x32/0xa9
Mar 4 19:30:40 localhost kernel: [<ffffffff8112429f>]
do_vfs_ioctl+0x4ae/0x4f4
Mar 4 19:30:40 localhost kernel: [<ffffffff8112433b>] sys_ioctl+0x56/0x79
Mar 4 19:30:40 localhost kernel: [<ffffffff81009d72>]
system_call_fastpath+0x16/0x1b
Mar 4 19:30:40 localhost kernel:
Mar 4 19:30:40 localhost kernel: -> #1 (&bdev->bd_mutex/1){+.+.+.}:
Mar 4 19:30:40 localhost kernel: [<ffffffff8107d132>]
__lock_acquire+0xb66/0xd1e
Mar 4 19:30:40 localhost kernel: [<ffffffff8107d3cb>]
lock_acquire+0xe1/0x105
Mar 4 19:30:40 localhost kernel: [<ffffffff81457ad4>]
_mutex_lock_nested+0x32/0x41
Mar 4 19:30:40 localhost kernel: [<ffffffff81213f3e>]
blkpg_ioctl+0x226/0x27f
Mar 4 19:30:40 localhost kernel: [<ffffffff812144f1>]
blkdev_ioctl+0x55a/0x6b1
Mar 4 19:30:40 localhost kernel: [<ffffffff8113d34b>]
block_ioctl+0x3d/0x41
Mar 4 19:30:40 localhost kernel: [<ffffffff81123cf8>] vfs_ioctl+0x32/0xa9
Mar 4 19:30:40 localhost kernel: [<ffffffff8112429f>]
do_vfs_ioctl+0x4ae/0x4f4
Mar 4 19:30:40 localhost kernel: [<ffffffff8112433b>] sys_ioctl+0x56/0x79
Mar 4 19:30:40 localhost kernel: [<ffffffff81009d72>]
system_call_fastpath+0x16/0x1b
Mar 4 19:30:40 localhost kernel:
Mar 4 19:30:40 localhost kernel: -> #0 (&bdev->bd_mutex){+.+.+.}:
Mar 4 19:30:40 localhost kernel: [<ffffffff8107cfdc>]
__lock_acquire+0xa10/0xd1e
Mar 4 19:30:40 localhost kernel: [<ffffffff8107d3cb>]
lock_acquire+0xe1/0x105
Mar 4 19:30:40 localhost kernel: [<ffffffff81457b17>]
_mutex_lock+0x34/0x43
Mar 4 19:30:40 localhost kernel: [<ffffffff8113d933>]
bd_claim_by_disk+0xef/0x272
Mar 4 19:30:40 localhost kernel: [<ffffffff81367a77>]
bind_rdev_to_array+0x268/0x2c2
Mar 4 19:30:40 localhost kernel: [<ffffffff8136d1c7>]
new_dev_store+0x13a/0x173
Mar 4 19:30:40 localhost kernel: [<ffffffff8136770e>]
md_attr_store+0x7b/0x98
Mar 4 19:30:40 localhost kernel: [<ffffffff8116ec75>]
sysfs_write_file+0x107/0x143
Mar 4 19:30:40 localhost kernel: [<ffffffff81117294>]
vfs_write+0xb1/0x10e
Mar 4 19:30:40 localhost kernel: [<ffffffff811173b7>] sys_write+0x4d/0x74
Mar 4 19:30:40 localhost kernel: [<ffffffff81009d72>]
system_call_fastpath+0x16/0x1b
Mar 4 19:30:40 localhost kernel:
Mar 4 19:30:40 localhost kernel: other info that might help us debug this:
Mar 4 19:30:40 localhost kernel:
Mar 4 19:30:40 localhost kernel: 4 locks held by mdadm/689:
Mar 4 19:30:40 localhost kernel: #0: (&buffer->mutex){+.+.+.}, at:
[<ffffffff8116eba8>] sysfs_write_file+0x3a/0x143
Mar 4 19:30:40 localhost kernel: #1: (s_active){++++.+}, at:
[<ffffffff81170329>] sysfs_get_active_two+0x24/0x4b
Mar 4 19:30:40 localhost kernel: #2: (s_active){++++.+}, at:
[<ffffffff81170336>] sysfs_get_active_two+0x31/0x4b
Mar 4 19:30:40 localhost kernel: #3: (&new->reconfig_mutex){+.+.+.},
at: [<ffffffff81366490>] mddev_lock+0x15/0x17
Mar 4 19:30:40 localhost kernel:
Mar 4 19:30:40 localhost kernel: stack backtrace:
Mar 4 19:30:40 localhost kernel: Pid: 689, comm: mdadm Not tainted
2.6.33-rt4 #1
Mar 4 19:30:40 localhost kernel: Call Trace:
Mar 4 19:30:40 localhost kernel: [<ffffffff8107c19b>]
print_circular_bug+0xa8/0xb7
Mar 4 19:30:40 localhost kernel: [<ffffffff8107cfdc>]
__lock_acquire+0xa10/0xd1e
Mar 4 19:30:40 localhost kernel: [<ffffffff8113d933>] ?
bd_claim_by_disk+0xef/0x272
Mar 4 19:30:40 localhost kernel: [<ffffffff8107d3cb>] lock_acquire+0xe1/0x105
Mar 4 19:30:40 localhost kernel: [<ffffffff8113d933>] ?
bd_claim_by_disk+0xef/0x272
Mar 4 19:30:40 localhost kernel: [<ffffffff81457b17>] _mutex_lock+0x34/0x43
Mar 4 19:30:40 localhost kernel: [<ffffffff8113d933>] ?
bd_claim_by_disk+0xef/0x272
Mar 4 19:30:40 localhost kernel: [<ffffffff8113d933>]
bd_claim_by_disk+0xef/0x272
Mar 4 19:30:40 localhost kernel: [<ffffffff8136772b>] ? lock_rdev+0x0/0xe4
Mar 4 19:30:40 localhost kernel: [<ffffffff81367a77>]
bind_rdev_to_array+0x268/0x2c2
Mar 4 19:30:40 localhost kernel: [<ffffffff8136d019>] ?
md_import_device+0x207/0x27b
Mar 4 19:30:40 localhost kernel: [<ffffffff8136d1c7>] new_dev_store+0x13a/0x173
Mar 4 19:30:40 localhost kernel: [<ffffffff81457f3d>] ?
_mutex_lock_interruptible+0x43/0x67
Mar 4 19:30:40 localhost kernel: [<ffffffff81366490>] ? mddev_lock+0x15/0x17
Mar 4 19:30:40 localhost kernel: [<ffffffff8136770e>] md_attr_store+0x7b/0x98
Mar 4 19:30:40 localhost kernel: [<ffffffff8116ec75>]
sysfs_write_file+0x107/0x143
Mar 4 19:30:40 localhost kernel: [<ffffffff81117294>] vfs_write+0xb1/0x10e
Mar 4 19:30:40 localhost kernel: [<ffffffff8107bae9>] ?
trace_hardirqs_on_caller+0x125/0x150
Mar 4 19:30:40 localhost kernel: [<ffffffff811173b7>] sys_write+0x4d/0x74
Mar 4 19:30:40 localhost kernel: [<ffffffff81009d72>]
system_call_fastpath+0x16/0x1b
Mar 4 19:30:40 localhost kernel: md: bind<sdb>
Mar 4 19:30:40 localhost kernel: dracut: mdadm: Container /dev/md0
has been assembled with 2 drives
Mar 4 19:30:40 localhost kernel: md: md127 stopped.
Mar 4 19:30:40 localhost kernel: md: bind<sdb>
Mar 4 19:30:40 localhost kernel: md: bind<sda>
Mar 4 19:30:40 localhost kernel: md: raid0 personality registered for level 0
Mar 4 19:30:40 localhost kernel: raid0: looking at sda
Mar 4 19:30:40 localhost kernel: raid0: comparing sda(1953517824)
Mar 4 19:30:40 localhost kernel: with sda(1953517824)
Mar 4 19:30:40 localhost kernel: raid0: END
Mar 4 19:30:40 localhost kernel: raid0: ==> UNIQUE
Mar 4 19:30:40 localhost kernel: raid0: 1 zones
Mar 4 19:30:40 localhost kernel: raid0: looking at sdb
Mar 4 19:30:40 localhost kernel: raid0: comparing sdb(1953517824)
Mar 4 19:30:40 localhost kernel: with sda(1953517824)
Mar 4 19:30:40 localhost kernel: raid0: EQUAL
Mar 4 19:30:40 localhost kernel: raid0: FINAL 1 zones
Mar 4 19:30:40 localhost kernel: raid0: done.
Mar 4 19:30:40 localhost kernel: raid0 : md_size is 3907035136 sectors.
Mar 4 19:30:40 localhost kernel: ******* md127 configuration *********
Mar 4 19:30:40 localhost kernel: zone0=[sda/sdb/]
Mar 4 19:30:40 localhost kernel: zone offset=0kb device
offset=0kb size=1953517824kb
Mar 4 19:30:40 localhost kernel: **********************************
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