lockdep with reiserfs
From: Yinghai Lu
Date: Tue Dec 22 2009 - 23:50:32 EST
x:~ # mount /dev/sda2 /xx
[ 277.586941] =======================================================
[ 277.594680] [ INFO: possible circular locking dependency detected ]
[ 277.601299] 2.6.33-rc1-tip-yh-00304-g97a015d-dirty #1007
[ 277.605492] -------------------------------------------------------
[ 277.622611] mount/19427 is trying to acquire lock:
[ 277.627353] (&journal->j_mutex){+.+...}, at: [<ffffffff811c6d40>]
do_journal_begin_r+0x9f/0x308
[ 277.645049]
[ 277.645050] but task is already holding lock:
[ 277.659112] (&REISERFS_SB(s)->lock){+.+.+.}, at:
[<ffffffff811cc0b0>] reiserfs_write_lock+0x30/0x42
[ 277.677168]
[ 277.677169] which lock already depends on the new lock.
[ 277.677170]
[ 277.685840]
[ 277.685841] the existing dependency chain (in reverse order) is:
[ 277.700845]
[ 277.700845] -> #1 (&REISERFS_SB(s)->lock){+.+.+.}:
[ 277.707089] [<ffffffff810a8735>] check_prev_add+0x3ca/0x583
[ 277.723457] [<ffffffff810a8d4b>] validate_chain+0x45d/0x567
[ 277.738331] [<ffffffff810a9605>] __lock_acquire+0x7b0/0x838
[ 277.745738] [<ffffffff810a9751>] lock_acquire+0xc4/0xe1
[ 277.758903] [<ffffffff81d305bf>] mutex_lock_nested+0x68/0x2d2
[ 277.765408] [<ffffffff811cc0b0>] reiserfs_write_lock+0x30/0x42
[ 277.780623] [<ffffffff811c6d48>] do_journal_begin_r+0xa7/0x308
[ 277.788070] [<ffffffff811c717c>] journal_begin+0xcb/0x10f
[ 277.801530] [<ffffffff811b924f>] reiserfs_fill_super+0x6f6/0xa04
[ 277.818144] [<ffffffff81134094>] get_sb_bdev+0x134/0x17f
[ 277.824414] [<ffffffff811b67b7>] get_super_block+0x18/0x1a
[ 277.838452] [<ffffffff81132d81>] vfs_kern_mount+0x5b/0xce
[ 277.843123] [<ffffffff81132e5b>] do_kern_mount+0x4c/0xec
[ 277.858708] [<ffffffff8114aa43>] do_mount+0x1c7/0x228
[ 277.865063] [<ffffffff8114ab28>] sys_mount+0x84/0xc4
[ 277.879329] [<ffffffff81033bdb>] system_call_fastpath+0x16/0x1b
[ 277.885762]
[ 277.885763] -> #0 (&journal->j_mutex){+.+...}:
[ 277.900836] [<ffffffff810a8464>] check_prev_add+0xf9/0x583
[ 277.905844] [<ffffffff810a8d4b>] validate_chain+0x45d/0x567
[ 277.921016] [<ffffffff810a9605>] __lock_acquire+0x7b0/0x838
[ 277.937549] [<ffffffff810a9751>] lock_acquire+0xc4/0xe1
[ 277.941772] [<ffffffff81d305bf>] mutex_lock_nested+0x68/0x2d2
[ 277.958127] [<ffffffff811c6d40>] do_journal_begin_r+0x9f/0x308
[ 277.964631] [<ffffffff811c717c>] journal_begin+0xcb/0x10f
[ 277.978818] [<ffffffff811b24cd>] reiserfs_delete_inode+0x96/0x141
[ 277.984215] [<ffffffff81145b40>] generic_delete_inode+0xe1/0x174
[ 278.002166] [<ffffffff81145bef>] generic_drop_inode+0x1c/0x67
[ 278.016829] [<ffffffff81144a31>] iput+0x66/0x6a
[ 278.022807] [<ffffffff811b8294>] finish_unfinished+0x47a/0x529
[ 278.037406] [<ffffffff811b93ef>] reiserfs_fill_super+0x896/0xa04
[ 278.042843] [<ffffffff81134094>] get_sb_bdev+0x134/0x17f
[ 278.058832] [<ffffffff811b67b7>] get_super_block+0x18/0x1a
[ 278.064476] [<ffffffff81132d81>] vfs_kern_mount+0x5b/0xce
[ 278.079763] [<ffffffff81132e5b>] do_kern_mount+0x4c/0xec
[ 278.085409] [<ffffffff8114aa43>] do_mount+0x1c7/0x228
[ 278.099487] [<ffffffff8114ab28>] sys_mount+0x84/0xc4
[ 278.104554] [<ffffffff81033bdb>] system_call_fastpath+0x16/0x1b
[ 278.120594]
[ 278.120594] other info that might help us debug this:
[ 278.120595]
[ 278.137861] 2 locks held by mount/19427:
[ 278.142048] #0: (&type->s_umount_key#17/1){+.+.+.}, at:
[<ffffffff8113398d>] alloc_super+0x153/0x227
[ 278.161051] #1: (&REISERFS_SB(s)->lock){+.+.+.}, at:
[<ffffffff811cc0b0>] reiserfs_write_lock+0x30/0x42
[ 278.178694]
[ 278.178694] stack backtrace:
[ 278.183421] Pid: 19427, comm: mount Not tainted
2.6.33-rc1-tip-yh-00304-g97a015d-dirty #1007
[ 278.200418] Call Trace:
[ 278.203357] [<ffffffff810a7dcc>] print_circular_bug+0xb3/0xc2
[ 278.218174] [<ffffffff810a8464>] check_prev_add+0xf9/0x583
[ 278.223784] [<ffffffff810a8d4b>] validate_chain+0x45d/0x567
[ 278.238230] [<ffffffff810a9605>] __lock_acquire+0x7b0/0x838
[ 278.244997] [<ffffffff81d303de>] ? __mutex_unlock_slowpath+0x112/0x11e
[ 278.259664] [<ffffffff810a9751>] lock_acquire+0xc4/0xe1
[ 278.264989] [<ffffffff811c6d40>] ? do_journal_begin_r+0x9f/0x308
[ 278.278800] [<ffffffff81d305bf>] mutex_lock_nested+0x68/0x2d2
[ 278.284152] [<ffffffff811c6d40>] ? do_journal_begin_r+0x9f/0x308
[ 278.299640] [<ffffffff811c6d40>] ? do_journal_begin_r+0x9f/0x308
[ 278.305289] [<ffffffff811cb418>] ? reiserfs_for_each_xattr+0x72/0x2ad
[ 278.322801] [<ffffffff8109b2c8>] ? cpu_clock+0x2d/0x3f
[ 278.336165] [<ffffffff811c6d40>] do_journal_begin_r+0x9f/0x308
[ 278.341890] [<ffffffff810a5c2e>] ? trace_hardirqs_off_caller+0x1f/0xa9
[ 278.357094] [<ffffffff811c717c>] journal_begin+0xcb/0x10f
[ 278.362825] [<ffffffff811b24cd>] reiserfs_delete_inode+0x96/0x141
[ 278.377094] [<ffffffff811b2437>] ? reiserfs_delete_inode+0x0/0x141
[ 278.383601] [<ffffffff81145b40>] generic_delete_inode+0xe1/0x174
[ 278.398309] [<ffffffff81145bef>] generic_drop_inode+0x1c/0x67
[ 278.403863] [<ffffffff81144a31>] iput+0x66/0x6a
[ 278.418387] [<ffffffff811b8294>] finish_unfinished+0x47a/0x529
[ 278.422333] [<ffffffff811cc0b0>] ? reiserfs_write_lock+0x30/0x42
[ 278.438673] [<ffffffff810a6f29>] ? trace_hardirqs_on+0xd/0xf
[ 278.444584] [<ffffffff811b93ef>] reiserfs_fill_super+0x896/0xa04
[ 278.459330] [<ffffffff81134094>] get_sb_bdev+0x134/0x17f
[ 278.464098] [<ffffffff811b8b59>] ? reiserfs_fill_super+0x0/0xa04
[ 278.479768] [<ffffffff811b67b7>] get_super_block+0x18/0x1a
[ 278.484545] [<ffffffff81132d81>] vfs_kern_mount+0x5b/0xce
[ 278.500296] [<ffffffff81132e5b>] do_kern_mount+0x4c/0xec
[ 278.506534] [<ffffffff8114aa43>] do_mount+0x1c7/0x228
[ 278.518910] [<ffffffff8114ab28>] sys_mount+0x84/0xc4
[ 278.522530] [<ffffffff81d31bfe>] ? trace_hardirqs_on_thunk+0x3a/0x3f
[ 278.541059] [<ffffffff81033bdb>] system_call_fastpath+0x16/0x1b
[ 278.555566] done
[ 278.557459] REISERFS (device sda2): There were 1 uncompleted
unlinks/truncates. Completed
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