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SubjectRe: [2.6.22] circular lock detected
> > On Fri, 24 Aug 2007 23:00:33 +0200 Folkert van Heusden <folkert@vanheusden.com> wrote:
> > Hi,
> >
> > 2.6.22 kernel with hyperthreading enabled only ext3 filesystems (2).
> >
> > [ 346.314640] =======================================================
> > [ 346.314758] [ INFO: possible circular locking dependency detected ]
> > [ 346.314815] 2.6.22 #5
> > [ 346.314862] -------------------------------------------------------
> > [ 346.314920] tor/2421 is trying to acquire lock:
> > [ 346.314973] (tty_mutex){--..}, at: [<c121aa83>] mutex_lock+0x8/0xa
> > [ 346.315193]
> > [ 346.315195] but task is already holding lock:
> > [ 346.316203] (&s->s_dquot.dqptr_sem){----}, at: [<c10a485f>] dquot_alloc_space+0x50/0x189
> > [ 346.316457]
> > [ 346.316458] which lock already depends on the new lock.
> > [ 346.316461]
> > [ 346.316585]
> > [ 346.316586] the existing dependency chain (in reverse order) is:
> > [ 346.316675]
> > [ 346.316676] -> #4 (&s->s_dquot.dqptr_sem){----}:
> > [ 346.316871] [<c103b2ee>] check_prev_add+0x15b/0x281
> > [ 346.317204] [<c103b49f>] check_prevs_add+0x8b/0xe8
> > [ 346.317535] [<c103ce2a>] __lock_acquire+0x65d/0xb51
> > [ 346.317873] [<c103d786>] lock_acquire+0x62/0x81
> > [ 346.318195] [<c10341af>] down_read+0x2b/0x3d
> > [ 346.318527] [<c10a485f>] dquot_alloc_space+0x50/0x189
> > [ 346.318854] [<c10b5c55>] ext3_new_blocks+0x44b/0x5a2
> > [ 346.319187] [<c10b81e4>] ext3_alloc_blocks+0x40/0xdf
> > [ 346.319513] [<c10b82d3>] ext3_alloc_branch+0x50/0x21b
> > [ 346.319850] [<c10b87b1>] ext3_get_blocks_handle+0x1b8/0x367
> > [ 346.320184] [<c10b8ada>] ext3_getblk+0x97/0x228
> > [ 346.320530] [<c10b8c85>] ext3_bread+0x1a/0x78
> > [ 346.320870] [<c10bde64>] ext3_mkdir+0xf4/0x270
> > [ 346.321188] [<c107cdf6>] vfs_mkdir+0xb3/0x161
> > [ 346.321506] [<c107cf30>] sys_mkdirat+0x8c/0xc4
> > [ 346.321820] [<c107cf88>] sys_mkdir+0x20/0x22
> > [ 346.322131] [<c1003eea>] syscall_call+0x7/0xb
> > [ 346.322446] [<ffffffff>] 0xffffffff
> > [ 346.322779]
> > [ 346.322780] -> #3 (&ei->truncate_mutex){--..}:
> > [ 346.322965] [<c103b2ee>] check_prev_add+0x15b/0x281
> > [ 346.323278] [<c103b49f>] check_prevs_add+0x8b/0xe8
> > [ 346.323602] [<c103ce2a>] __lock_acquire+0x65d/0xb51
> > [ 346.323919] [<c103d786>] lock_acquire+0x62/0x81
> > [ 346.324234] [<c121ab04>] __mutex_lock_slowpath+0x75/0x28c
> > [ 346.324857] [<c121aa83>] mutex_lock+0x8/0xa
> > [ 346.325177] [<c10ba380>] ext3_truncate+0x170/0x468
> > [ 346.325501] [<c1060e9a>] vmtruncate+0xa6/0x116
> > [ 346.325828] [<c1087937>] inode_setattr+0x145/0x16c
> > [ 346.326150] [<c10bb301>] ext3_setattr+0x150/0x22f
> > [ 346.326479] [<c1087cb0>] notify_change+0x352/0x386
> > [ 346.326802] [<c1071af4>] do_truncate+0x5c/0x7f
> > [ 346.327116] [<c107c2e3>] may_open+0x1ec/0x231
> > [ 346.327434] [<c107c4a4>] open_namei+0xdd/0x5a2
> > [ 346.327770] [<c107275b>] do_filp_open+0x2c/0x53
> > [ 346.328090] [<c1072a90>] do_sys_open+0x52/0xd8
> > [ 346.328408] [<c1072b32>] sys_open+0x1c/0x1e
> > [ 346.328727] [<c1003eea>] syscall_call+0x7/0xb
> > [ 346.329042] [<ffffffff>] 0xffffffff
> > [ 346.329368]
> > [ 346.329370] -> #2 (&inode->i_alloc_sem){--..}:
> > [ 346.329556] [<c103b2ee>] check_prev_add+0x15b/0x281
> > [ 346.329879] [<c103b49f>] check_prevs_add+0x8b/0xe8
> > [ 346.330192] [<c103ce2a>] __lock_acquire+0x65d/0xb51
> > [ 346.330508] [<c103d786>] lock_acquire+0x62/0x81
> > [ 346.330826] [<c1034245>] down_write+0x2b/0x45
> > [ 346.331137] [<c1087c37>] notify_change+0x2d9/0x386
> > [ 346.331453] [<c1071af4>] do_truncate+0x5c/0x7f
> > [ 346.331769] [<c107c2e3>] may_open+0x1ec/0x231
> > [ 346.332087] [<c107c4a4>] open_namei+0xdd/0x5a2
> > [ 346.332401] [<c107275b>] do_filp_open+0x2c/0x53
> > [ 346.332720] [<c1072a90>] do_sys_open+0x52/0xd8
> > [ 346.333037] [<c1072b32>] sys_open+0x1c/0x1e
> > [ 346.333600] [<c1003eea>] syscall_call+0x7/0xb
> > [ 346.333912] [<ffffffff>] 0xffffffff
> > [ 346.334232]
> > [ 346.334233] -> #1 (&sysfs_inode_imutex_key){--..}:
> > [ 346.334422] [<c103b2ee>] check_prev_add+0x15b/0x281
> > [ 346.334734] [<c103b49f>] check_prevs_add+0x8b/0xe8
> > [ 346.335046] [<c103ce2a>] __lock_acquire+0x65d/0xb51
> > [ 346.335361] [<c103d786>] lock_acquire+0x62/0x81
> > [ 346.335685] [<c121ab04>] __mutex_lock_slowpath+0x75/0x28c
> > [ 346.336001] [<c121aa83>] mutex_lock+0x8/0xa
> > [ 346.336313] [<c10b2828>] remove_dir+0x2c/0xf1
> > [ 346.336629] [<c10b28f5>] sysfs_remove_subdir+0x8/0xa
> > [ 346.336941] [<c10b3ccf>] sysfs_remove_group+0x67/0x78
> > [ 346.337256] [<c115cc58>] dpm_sysfs_remove+0x12/0x16
> > [ 346.337574] [<c115c36f>] device_pm_remove+0x21/0x62
> > [ 346.337888] [<c1156dc5>] device_del+0x82/0x291
> > [ 346.338199] [<c1156fdf>] device_unregister+0xb/0x15
> > [ 346.338516] [<c11571da>] device_destroy+0x8d/0x9a
> > [ 346.338827] [<c1142712>] vcs_remove_sysfs+0x1c/0x3a
> > [ 346.339142] [<c1149075>] con_close+0x5e/0x6b
> > [ 346.339458] [<c113aa5e>] release_dev+0x4c4/0x6ce
> > [ 346.339767] [<c113b0d6>] tty_release+0x12/0x1c
> > [ 346.340078] [<c1074479>] __fput+0x145/0x16e
> > [ 346.340392] [<c1074332>] fput+0x19/0x1b
> > [ 346.340701] [<c1072bb3>] filp_close+0x3c/0x75
> > [ 346.341012] [<c1072c55>] sys_close+0x69/0xb4
> > [ 346.341325] [<c1003eea>] syscall_call+0x7/0xb
> > [ 346.341892] [<ffffffff>] 0xffffffff
> > [ 346.342213]
> > [ 346.342214] -> #0 (tty_mutex){--..}:
> > [ 346.342397] [<c103b1c7>] check_prev_add+0x34/0x281
> > [ 346.342708] [<c103b49f>] check_prevs_add+0x8b/0xe8
> > [ 346.343017] [<c103ce2a>] __lock_acquire+0x65d/0xb51
> > [ 346.343333] [<c103d786>] lock_acquire+0x62/0x81
> > [ 346.343646] [<c121ab04>] __mutex_lock_slowpath+0x75/0x28c
> > [ 346.343956] [<c121aa83>] mutex_lock+0x8/0xa
> > [ 346.344263] [<c10a41d5>] print_warning+0x8c/0x15d
> > [ 346.344575] [<c10a4993>] dquot_alloc_space+0x184/0x189
> > [ 346.344883] [<c10b5c55>] ext3_new_blocks+0x44b/0x5a2
> > [ 346.345193] [<c10b81e4>] ext3_alloc_blocks+0x40/0xdf
> > [ 346.345507] [<c10b82d3>] ext3_alloc_branch+0x50/0x21b
> > [ 346.345816] [<c10b87b1>] ext3_get_blocks_handle+0x1b8/0x367
> > [ 346.346127] [<c10b89d8>] ext3_get_block+0x78/0xe3
> > [ 346.346441] [<c1094802>] __block_prepare_write+0x168/0x415
> > [ 346.346750] [<c109530e>] block_prepare_write+0x28/0x3b
> > [ 346.347057] [<c10b8e84>] ext3_prepare_write+0xe3/0x17e
> > [ 346.347369] [<c10552f1>] generic_file_buffered_write+0x1b4/0x614
> > [ 346.347689] [<c105598b>] __generic_file_aio_write_nolock+0x23a/0x533
> > [ 346.348002] [<c1055d8d>] generic_file_aio_write+0x58/0xc4
> > [ 346.348314] [<c10b6a93>] ext3_file_write+0x2d/0xba
> > [ 346.348627] [<c107353b>] do_sync_write+0xc7/0x116
> > [ 346.348935] [<c10736e2>] vfs_write+0x158/0x15d
> > [ 346.349246] [<c1073788>] sys_write+0x3d/0x64
> > [ 346.349560] [<c1003eea>] syscall_call+0x7/0xb
> > [ 346.349869] [<ffffffff>] 0xffffffff
> > [ 346.350438]
> > [ 346.350440] other info that might help us debug this:
> > [ 346.350442]
> > [ 346.350562] 3 locks held by tor/2421:
> > [ 346.350604] #0: (&inode->i_mutex){--..}, at: [<c121aa83>] mutex_lock+0x8/0xa
> > [ 346.350827] #1: (&ei->truncate_mutex){--..}, at: [<c121aa83>] mutex_lock+0x8/0xa
> > [ 346.351049] #2: (&s->s_dquot.dqptr_sem){----}, at: [<c10a485f>] dquot_alloc_space+0x50/0x189
> > [ 346.351274]
> > [ 346.351276] stack backtrace:
> > [ 346.351363] [<c1004cac>] show_trace_log_lvl+0x1a/0x30
> > [ 346.351446] [<c1004cd4>] show_trace+0x12/0x14
> > [ 346.351526] [<c1004dce>] dump_stack+0x16/0x18
> > [ 346.351605] [<c103ab29>] print_circular_bug_tail+0x6f/0x71
> > [ 346.351686] [<c103b1c7>] check_prev_add+0x34/0x281
> > [ 346.351764] [<c103b49f>] check_prevs_add+0x8b/0xe8
> > [ 346.351843] [<c103ce2a>] __lock_acquire+0x65d/0xb51
> > [ 346.351921] [<c103d786>] lock_acquire+0x62/0x81
> > [ 346.352002] [<c121ab04>] __mutex_lock_slowpath+0x75/0x28c
> > [ 346.352083] [<c121aa83>] mutex_lock+0x8/0xa
> > [ 346.352160] [<c10a41d5>] print_warning+0x8c/0x15d
> > [ 346.352240] [<c10a4993>] dquot_alloc_space+0x184/0x189
> > [ 346.352323] [<c10b5c55>] ext3_new_blocks+0x44b/0x5a2
> > [ 346.352402] [<c10b81e4>] ext3_alloc_blocks+0x40/0xdf
> > [ 346.352479] [<c10b82d3>] ext3_alloc_branch+0x50/0x21b
> > [ 346.352558] [<c10b87b1>] ext3_get_blocks_handle+0x1b8/0x367
> > [ 346.352638] [<c10b89d8>] ext3_get_block+0x78/0xe3
> > [ 346.352720] [<c1094802>] __block_prepare_write+0x168/0x415
> > [ 346.352801] [<c109530e>] block_prepare_write+0x28/0x3b
> > [ 346.352881] [<c10b8e84>] ext3_prepare_write+0xe3/0x17e
> > [ 346.352961] [<c10552f1>] generic_file_buffered_write+0x1b4/0x614
> > [ 346.353041] [<c105598b>] __generic_file_aio_write_nolock+0x23a/0x533
> > [ 346.353121] [<c1055d8d>] generic_file_aio_write+0x58/0xc4
> > [ 346.353200] [<c10b6a93>] ext3_file_write+0x2d/0xba
> > [ 346.353281] [<c107353b>] do_sync_write+0xc7/0x116
> > [ 346.353364] [<c10736e2>] vfs_write+0x158/0x15d
> > [ 346.353444] [<c1073788>] sys_write+0x3d/0x64
> > [ 346.353524] [<c1003eea>] syscall_call+0x7/0xb
> > [ 346.353603] =======================
> >
> Has been reported before, but I don't recall whether we fixed it. Jan,
> do you know>?
I think we at least found a solution: Teach lockdep that I_MUTEX for
different filesystems is different. Peter Zilstra wrote a patch for that
and Folkert even confirmed that it fixes the problem for him. I'm not
sure what happened with the patch afterwards though. Adding Peter to CC
:).
Honza
--
Jan Kara <jack@suse.cz>
SuSE CR Labs
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