After a " rm -r /verybigdir" (about 12G on a 25G reiserfs 3.6partition)
I found the following report about a circular locking dependency in
kernel 3.1.0
[ 337.064044]
[ 337.064046] =======================================================
[ 337.064059] [ INFO: possible circular locking dependency detected ]
[ 337.064069] 3.1.0-main #18
[ 337.064074] -------------------------------------------------------
[ 337.064083] rm/4340 is trying to acquire lock:
[ 337.064090] (&sb->s_type->i_mutex_key#12/2){+.+.+.}, at: [<c01f73d7>] xattr_unlink+0x3a/0x6d
[ 337.064114]
[ 337.064115] but task is already holding lock:
[ 337.064123] (&sb->s_type->i_mutex_key#12/3){+.+.+.}, at: [<c01f7884>] reiserfs_for_each_xattr+0x9e/0x224
[ 337.064143]
[ 337.064144] which lock already depends on the new lock.
[ 337.064146]
[ 337.064156]
[ 337.064157] the existing dependency chain (in reverse order) is:
[ 337.064167]
[ 337.064168] -> #1 (&sb->s_type->i_mutex_key#12/3){+.+.+.}:
[ 337.064184] [<c0149c32>] lock_acquire+0x47/0x5e
[ 337.064195] [<c04360df>] mutex_lock_nested+0x35/0x26f
[ 337.064208] [<c01f7603>] open_xa_dir+0x3d/0x150
[ 337.064218] [<c01f772a>] xattr_lookup+0x14/0xd0
[ 337.064228] [<c01f7f50>] reiserfs_xattr_get+0x4c/0x21b
[ 337.064238] [<c01f88f4>] security_get+0x3e/0x46
[ 337.064248] [<c01f817c>] reiserfs_getxattr+0x5d/0x7a
[ 337.064258] [<c02414e8>] cap_inode_need_killpriv+0x1e/0x2d
[ 337.064272] [<c024264c>] security_inode_need_killpriv+0xf/0x11
[ 337.064284] [<c016dc16>] file_remove_suid+0x27/0x71
[ 337.064296] [<c01ae38b>] generic_file_splice_write+0x86/0x121
[ 337.064310] [<c01adfa9>] do_splice_from+0x58/0x62
[ 337.064320] [<c01adfca>] direct_splice_actor+0x17/0x1c
[ 337.064331] [<c01ae256>] splice_direct_to_actor+0xbf/0x16e
[ 337.064342] [<c01af16c>] do_splice_direct+0x4b/0x62
[ 337.064353] [<c0192e02>] do_sendfile+0x159/0x1f1
[ 337.064365] [<c01938d7>] sys_sendfile64+0x3f/0x80
[ 337.064375] [<c043b10c>] sysenter_do_call+0x12/0x32
[ 337.064388]
[ 337.064389] -> #0 (&sb->s_type->i_mutex_key#12/2){+.+.+.}:
[ 337.064404] [<c01492ca>] __lock_acquire+0xee6/0x1472
[ 337.064416] [<c0149c32>] lock_acquire+0x47/0x5e
[ 337.064426] [<c04360df>] mutex_lock_nested+0x35/0x26f
[ 337.064436] [<c01f73d7>] xattr_unlink+0x3a/0x6d
[ 337.064446] [<c01f7499>] delete_one_xattr+0x8f/0x99
[ 337.064456] [<c01f78cf>] reiserfs_for_each_xattr+0xe9/0x224
[ 337.064467] [<c01f7a1f>] reiserfs_delete_xattrs+0x15/0x3f
[ 337.064477] [<c01dfba5>] reiserfs_evict_inode+0x7f/0x115
[ 337.064490] [<c01a4f27>] evict+0x85/0x126
[ 337.064500] [<c01a5109>] iput+0x141/0x146
[ 337.064509] [<c019d6d9>] do_unlinkat+0xf1/0x136
[ 337.064520] [<c019df1f>] sys_unlinkat+0x2b/0x32
[ 337.064530] [<c043b10c>] sysenter_do_call+0x12/0x32
[ 337.064541]
[ 337.064542] other info that might help us debug this:
[ 337.064544]
[ 337.064570] Possible unsafe locking scenario:
[ 337.064572]
[ 337.064588] CPU0 CPU1
[ 337.064599] ---- ----
[ 337.064609] lock(&sb->s_type->i_mutex_key);
[ 337.064623] lock(&sb->s_type->i_mutex_key);
[ 337.064638] lock(&sb->s_type->i_mutex_key);
[ 337.064654] lock(&sb->s_type->i_mutex_key);
[ 337.064667]
[ 337.064668] *** DEADLOCK ***
[ 337.064669]
[ 337.064690] 1 lock held by rm/4340:
[ 337.064700] #0: (&sb->s_type->i_mutex_key#12/3){+.+.+.}, at: [<c01f7884>] reiserfs_for_each_xattr+0x9e/0x224
[ 337.064725]
[ 337.064726] stack backtrace:
[ 337.064743] Pid: 4340, comm: rm Not tainted 3.1.0-main #18
[ 337.064755] Call Trace:
[ 337.064767] [<c0434964>] ? printk+0xf/0x13
[ 337.064781] [<c014732b>] print_circular_bug+0x215/0x222
[ 337.064796] [<c01492ca>] __lock_acquire+0xee6/0x1472
[ 337.064811] [<c0144a54>] ? tick_dev_program_event+0x24/0x105
[ 337.064826] [<c0149c32>] lock_acquire+0x47/0x5e
[ 337.064839] [<c01f73d7>] ? xattr_unlink+0x3a/0x6d
[ 337.064853] [<c01f73d7>] ? xattr_unlink+0x3a/0x6d
[ 337.064867] [<c04360df>] mutex_lock_nested+0x35/0x26f
[ 337.064881] [<c01f73d7>] ? xattr_unlink+0x3a/0x6d
[ 337.064894] [<c01f73d7>] xattr_unlink+0x3a/0x6d
[ 337.064908] [<c01f7499>] delete_one_xattr+0x8f/0x99
[ 337.064921] [<c01f78cf>] reiserfs_for_each_xattr+0xe9/0x224
[ 337.064936] [<c01f740a>] ? xattr_unlink+0x6d/0x6d
[ 337.064950] [<c0439a6f>] ? sub_preempt_count+0x81/0x8e
[ 337.064965] [<c04362fe>] ? mutex_lock_nested+0x254/0x26f
[ 337.064980] [<c01f7a1f>] reiserfs_delete_xattrs+0x15/0x3f
[ 337.064994] [<c01dfba5>] reiserfs_evict_inode+0x7f/0x115
[ 337.065009] [<c0120da4>] ? get_parent_ip+0xb/0x31
[ 337.065023] [<c0439a6f>] ? sub_preempt_count+0x81/0x8e
[ 337.065037] [<c01a4f27>] evict+0x85/0x126
[ 337.065050] [<c01a5109>] iput+0x141/0x146
[ 337.065063] [<c019d6d9>] do_unlinkat+0xf1/0x136
[ 337.065078] [<c01bb261>] ? dnotify_flush+0x2c/0xa6
[ 337.065092] [<c043b13b>] ? sysenter_exit+0xf/0x16
[ 337.065107] [<c019df1f>] sys_unlinkat+0x2b/0x32
[ 337.065120] [<c043b10c>] sysenter_do_call+0x12/0x32
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