lkml.org 
[lkml]   [2008]   [Mar]   [10]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
Subject25rc4-git3 blockdev/loopback related lockdep trace.
=======================================================
[ INFO: possible circular locking dependency detected ]
2.6.25-0.101.rc4.git3.fc9 #1
-------------------------------------------------------
mount/1208 is trying to acquire lock:
(&bdev->bd_mutex){--..}, at: [<c04a9119>] __blkdev_put+0x24/0x12f

but task is already holding lock:
(&lo->lo_ctl_mutex){--..}, at: [<e005c087>] lo_ioctl+0x3d/0xa01 [loop]

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #1 (&lo->lo_ctl_mutex){--..}:
[<c04457fc>] __lock_acquire+0xa99/0xc11
[<c04459de>] lock_acquire+0x6a/0x90
[<c06378d1>] mutex_lock_nested+0xdb/0x271
[<e005b1e1>] lo_open+0x23/0x33 [loop]
[<c04a94ff>] do_open+0x97/0x281
[<c04a9711>] blkdev_open+0x28/0x51
[<c0486c24>] __dentry_open+0xcf/0x185
[<c0486d4b>] nameidata_to_filp+0x1f/0x33
[<c0486d8d>] do_filp_open+0x2e/0x35
[<c0486dd4>] do_sys_open+0x40/0xb5
[<c0486e75>] sys_open+0x16/0x18
[<c0405d16>] syscall_call+0x7/0xb
[<ffffffff>] 0xffffffff

-> #0 (&bdev->bd_mutex){--..}:
[<c044571b>] __lock_acquire+0x9b8/0xc11
[<c04459de>] lock_acquire+0x6a/0x90
[<c06378d1>] mutex_lock_nested+0xdb/0x271
[<c04a9119>] __blkdev_put+0x24/0x12f
[<c04a922e>] blkdev_put+0xa/0xc
[<c04a9258>] blkdev_close+0x28/0x2b
[<c048926c>] __fput+0xb3/0x157
[<c0489327>] fput+0x17/0x19
[<e005bbde>] loop_clr_fd+0x159/0x16d [loop]
[<e005c68a>] lo_ioctl+0x640/0xa01 [loop]
[<c04f0afd>] blkdev_driver_ioctl+0x49/0x5b
[<c04f12bb>] blkdev_ioctl+0x7ac/0x7c9
[<c04a8cb4>] block_ioctl+0x16/0x1b
[<c04929a6>] vfs_ioctl+0x22/0x69
[<c0492c26>] do_vfs_ioctl+0x239/0x24c
[<c0492c79>] sys_ioctl+0x40/0x5b
[<c0405d16>] syscall_call+0x7/0xb
[<ffffffff>] 0xffffffff

other info that might help us debug this:

1 lock held by mount/1208:
#0: (&lo->lo_ctl_mutex){--..}, at: [<e005c087>] lo_ioctl+0x3d/0xa01 [loop]

stack backtrace:
Pid: 1208, comm: mount Not tainted 2.6.25-0.101.rc4.git3.fc9 #1
[<c0444b4d>] print_circular_bug_tail+0x5b/0x66
[<c0444a70>] ? print_circular_bug_header+0xa6/0xb1
[<c044571b>] __lock_acquire+0x9b8/0xc11
[<c0442f2e>] ? find_usage_backwards+0x92/0xb1
[<c04459de>] lock_acquire+0x6a/0x90
[<c04a9119>] ? __blkdev_put+0x24/0x12f
[<c06378d1>] mutex_lock_nested+0xdb/0x271
[<c04a9119>] ? __blkdev_put+0x24/0x12f
[<c04a9119>] ? __blkdev_put+0x24/0x12f
[<c04a9119>] __blkdev_put+0x24/0x12f
[<c04a922e>] blkdev_put+0xa/0xc
[<c04a9258>] blkdev_close+0x28/0x2b
[<c048926c>] __fput+0xb3/0x157
[<c0489327>] fput+0x17/0x19
[<e005bbde>] loop_clr_fd+0x159/0x16d [loop]
[<e005c68a>] lo_ioctl+0x640/0xa01 [loop]
[<c040a2f8>] ? native_sched_clock+0xb5/0xd1
[<c040a02a>] ? sched_clock+0x8/0xb
[<c0443085>] ? lock_release_holdtime+0x1a/0x115
[<c04d61f9>] ? avc_has_perm_noaudit+0x3a1/0x3dc
[<c04d6216>] ? avc_has_perm_noaudit+0x3be/0x3dc
[<c040a2f8>] ? native_sched_clock+0xb5/0xd1
[<c040a2f8>] ? native_sched_clock+0xb5/0xd1
[<c04452bd>] ? __lock_acquire+0x55a/0xc11
[<c040a2f8>] ? native_sched_clock+0xb5/0xd1
[<c04452bd>] ? __lock_acquire+0x55a/0xc11
[<c040a02a>] ? sched_clock+0x8/0xb
[<c0443085>] ? lock_release_holdtime+0x1a/0x115
[<c040a2f8>] ? native_sched_clock+0xb5/0xd1
[<c04452bd>] ? __lock_acquire+0x55a/0xc11
[<c040a2f8>] ? native_sched_clock+0xb5/0xd1
[<c040a02a>] ? sched_clock+0x8/0xb
[<c0443085>] ? lock_release_holdtime+0x1a/0x115
[<c04d61f9>] ? avc_has_perm_noaudit+0x3a1/0x3dc
[<c04f0afd>] blkdev_driver_ioctl+0x49/0x5b
[<c04f12bb>] blkdev_ioctl+0x7ac/0x7c9
[<c0443085>] ? lock_release_holdtime+0x1a/0x115
[<c04d80e7>] ? inode_has_perm+0x5b/0x65
[<c04a9711>] ? blkdev_open+0x28/0x51
[<c048363e>] ? check_object+0x111/0x184
[<c04d84c1>] ? file_has_perm+0x7f/0x88
[<c04a8cb4>] block_ioctl+0x16/0x1b
[<c04a8c9e>] ? block_ioctl+0x0/0x1b
[<c04929a6>] vfs_ioctl+0x22/0x69
[<c0492c26>] do_vfs_ioctl+0x239/0x24c
[<c04d864d>] ? selinux_file_ioctl+0xa8/0xab
[<c0492c79>] sys_ioctl+0x40/0x5b
[<c0405d16>] syscall_call+0x7/0xb

--
http://www.codemonkey.org.uk


\
 
 \ /
  Last update: 2008-03-10 16:03    [W:0.030 / U:9.264 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site