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Message-ID: <20070214215922.GW26684@vanheusden.com>
Date: Wed, 14 Feb 2007 22:59:23 +0100
From: Folkert van Heusden <folkert@...heusden.com>
To: linux-kernel@...r.kernel.org
Subject: [2.6.20] possible circular locking dependency detected
Is this of any interest?
[ 141.713801] =======================================================
[ 141.713891] [ INFO: possible circular locking dependency detected ]
[ 141.713937] 2.6.20 #2
[ 141.713980] -------------------------------------------------------
[ 141.714025] tor/5534 is trying to acquire lock:
[ 141.714070] (tty_mutex){--..}, at: [<c1205b88>] mutex_lock+0x8/0xa
[ 141.714272]
[ 141.714273] but task is already holding lock:
[ 141.714277] (&s->s_dquot.dqptr_sem){----}, at: [<c1099403>] dquot_alloc_space+0x50/0x189
[ 141.714484]
[ 141.714486] which lock already depends on the new lock.
[ 141.714488]
[ 141.714490]
[ 141.714491] the existing dependency chain (in reverse order) is:
[ 141.714690]
[ 141.714691] -> #4 (&s->s_dquot.dqptr_sem){----}:
[ 141.714696] [<c10354b8>] check_prev_add+0x154/0x206
[ 141.714706] [<c10355d4>] check_prevs_add+0x6a/0xd5
[ 141.714716] [<c1036dd2>] __lock_acquire+0x61c/0xa05
[ 141.714723] [<c1037624>] lock_acquire+0x62/0x81
[ 141.714730] [<c1032b5f>] down_read+0x2b/0x3d
[ 141.714739] [<c1099403>] dquot_alloc_space+0x50/0x189
[ 141.714746] [<c10a98e6>] ext3_new_blocks+0x44b/0x5a2
[ 141.714754] [<c10abe78>] ext3_alloc_blocks+0x40/0xdf
[ 141.714762] [<c10abf67>] ext3_alloc_branch+0x50/0x21b
[ 141.714770] [<c10ac445>] ext3_get_blocks_handle+0x1b8/0x367
[ 141.714778] [<c10ac76e>] ext3_getblk+0x97/0x228
[ 141.714786] [<c10ac919>] ext3_bread+0x1a/0x78
[ 141.714796] [<c10b1bc2>] ext3_mkdir+0xf4/0x270
[ 141.714803] [<c1072a6a>] vfs_mkdir+0xb3/0x161
[ 141.714811] [<c1072ba4>] sys_mkdirat+0x8c/0xc4
[ 141.714818] [<c1072bfc>] sys_mkdir+0x20/0x22
[ 141.714826] [<c1002f78>] syscall_call+0x7/0xb
[ 141.714836] [<ffffffff>] 0xffffffff
[ 141.714857]
[ 141.714858] -> #3 (&ei->truncate_mutex){--..}:
[ 141.714861] [<c10354b8>] check_prev_add+0x154/0x206
[ 141.714870] [<c10355d4>] check_prevs_add+0x6a/0xd5
[ 141.714880] [<c1036dd2>] __lock_acquire+0x61c/0xa05
[ 141.714887] [<c1037624>] lock_acquire+0x62/0x81
[ 141.714894] [<c1205c09>] __mutex_lock_slowpath+0x75/0x28c
[ 141.714902] [<c1205b88>] mutex_lock+0x8/0xa
[ 141.714908] [<c10ae14f>] ext3_truncate+0x170/0x468
[ 141.714919] [<c1058e72>] vmtruncate+0xa6/0x116
[ 141.714927] [<c107d587>] inode_setattr+0x145/0x16c
[ 141.714935] [<c10af071>] ext3_setattr+0x150/0x22f
[ 141.714944] [<c107d909>] notify_change+0x35b/0x392
[ 141.714952] [<c10679d2>] do_truncate+0x52/0x75
[ 141.714963] [<c1071f5e>] may_open+0x1ec/0x231
[ 141.714971] [<c107211c>] open_namei+0xda/0x59b
[ 141.714978] [<c106863a>] do_filp_open+0x2c/0x53
[ 141.714986] [<c106896f>] do_sys_open+0x52/0xd8
[ 141.714994] [<c1068a11>] sys_open+0x1c/0x1e
[ 141.715004] [<c1002f78>] syscall_call+0x7/0xb
[ 141.715010] [<ffffffff>] 0xffffffff
[ 141.715020]
[ 141.715020] -> #2 (&inode->i_alloc_sem){--..}:
[ 141.715024] [<c10354b8>] check_prev_add+0x154/0x206
[ 141.715034] [<c10355d4>] check_prevs_add+0x6a/0xd5
[ 141.715045] [<c1036dd2>] __lock_acquire+0x61c/0xa05
[ 141.715052] [<c1037624>] lock_acquire+0x62/0x81
[ 141.715058] [<c1032bf5>] down_write+0x2b/0x45
[ 141.715066] [<c107d890>] notify_change+0x2e2/0x392
[ 141.715073] [<c10679d2>] do_truncate+0x52/0x75
[ 141.715084] [<c1071f5e>] may_open+0x1ec/0x231
[ 141.715091] [<c107211c>] open_namei+0xda/0x59b
[ 141.715098] [<c106863a>] do_filp_open+0x2c/0x53
[ 141.715106] [<c106896f>] do_sys_open+0x52/0xd8
[ 141.715113] [<c1068a11>] sys_open+0x1c/0x1e
[ 141.715120] [<c1002f78>] syscall_call+0x7/0xb
[ 141.715129] [<ffffffff>] 0xffffffff
[ 141.715137]
[ 141.715138] -> #1 (&sysfs_inode_imutex_key){--..}:
[ 141.715143] [<c10354b8>] check_prev_add+0x154/0x206
[ 141.715151] [<c10355d4>] check_prevs_add+0x6a/0xd5
[ 141.715159] [<c1036dd2>] __lock_acquire+0x61c/0xa05
[ 141.715166] [<c1037624>] lock_acquire+0x62/0x81
[ 141.715173] [<c1205c09>] __mutex_lock_slowpath+0x75/0x28c
[ 141.715181] [<c1205b88>] mutex_lock+0x8/0xa
[ 141.715188] [<c10a5447>] sysfs_hash_and_remove+0x43/0x11c
[ 141.715196] [<c10a5ef7>] sysfs_remove_file+0xd/0x12
[ 141.715206] [<c114b00c>] device_remove_file+0x32/0x44
[ 141.715213] [<c114b6d9>] device_del+0x174/0x1d2
[ 141.715220] [<c114b742>] device_unregister+0xb/0x15
[ 141.715228] [<c114b93d>] device_destroy+0x8d/0x9a
[ 141.715234] [<c1137a38>] vcs_remove_sysfs+0x1c/0x38
[ 141.715244] [<c113e0d8>] con_close+0x5e/0x6b
[ 141.715251] [<c1130103>] release_dev+0x4c4/0x6ce
[ 141.715260] [<c113077b>] tty_release+0x12/0x1c
[ 141.715268] [<c106a471>] __fput+0x145/0x16e
[ 141.715276] [<c106a32a>] fput+0x19/0x1b
[ 141.715285] [<c1068a92>] filp_close+0x3c/0x75
[ 141.715292] [<c1068b34>] sys_close+0x69/0xb4
[ 141.715299] [<c1002f78>] syscall_call+0x7/0xb
[ 141.715307] [<ffffffff>] 0xffffffff
[ 141.715316]
[ 141.715317] -> #0 (tty_mutex){--..}:
[ 141.715321] [<c1035398>] check_prev_add+0x34/0x206
[ 141.715332] [<c10355d4>] check_prevs_add+0x6a/0xd5
[ 141.715340] [<c1036dd2>] __lock_acquire+0x61c/0xa05
[ 141.715347] [<c1037624>] lock_acquire+0x62/0x81
[ 141.715354] [<c1205c09>] __mutex_lock_slowpath+0x75/0x28c
[ 141.715362] [<c1205b88>] mutex_lock+0x8/0xa
[ 141.715371] [<c1098d79>] print_warning+0x8c/0x15d
[ 141.715378] [<c1099537>] dquot_alloc_space+0x184/0x189
[ 141.715387] [<c10a98e6>] ext3_new_blocks+0x44b/0x5a2
[ 141.715394] [<c10abe78>] ext3_alloc_blocks+0x40/0xdf
[ 141.715402] [<c10abf67>] ext3_alloc_branch+0x50/0x21b
[ 141.715412] [<c10ac445>] ext3_get_blocks_handle+0x1b8/0x367
[ 141.715420] [<c10ac66c>] ext3_get_block+0x78/0xe3
[ 141.715428] [<c108a239>] __block_prepare_write+0x168/0x3fd
[ 141.715437] [<c108ad10>] block_prepare_write+0x28/0x3b
[ 141.715445] [<c10acbcd>] ext3_prepare_write+0x3f/0x18d
[ 141.715455] [<c104dbe5>] generic_file_buffered_write+0x197/0x5e6
[ 141.715463] [<c104e2e2>] __generic_file_aio_write_nolock+0x2ae/0x5ad
[ 141.715472] [<c104e6ea>] generic_file_aio_write+0x58/0xc4
[ 141.715479] [<c10aa723>] ext3_file_write+0x2d/0xba
[ 141.715487] [<c1069441>] do_sync_write+0xc7/0x116
[ 141.715497] [<c1069612>] vfs_write+0x182/0x187
[ 141.715504] [<c10696b8>] sys_write+0x3d/0x64
[ 141.715512] [<c1002f78>] syscall_call+0x7/0xb
[ 141.715519] [<ffffffff>] 0xffffffff
[ 141.715527]
[ 141.715529] other info that might help us debug this:
[ 141.715531]
[ 141.715533] 3 locks held by tor/5534:
[ 141.715535] #0: (&inode->i_mutex){--..}, at: [<c1205b88>] mutex_lock+0x8/0xa
[ 141.715542] #1: (&ei->truncate_mutex){--..}, at: [<c1205b88>] mutex_lock+0x8/0xa
[ 141.715548] #2: (&s->s_dquot.dqptr_sem){----}, at: [<c1099403>] dquot_alloc_space+0x50/0x189
[ 141.715555]
[ 141.715556] stack backtrace:
[ 141.715558] [<c1003d57>] show_trace_log_lvl+0x1a/0x30
[ 141.715563] [<c1003d7f>] show_trace+0x12/0x14
[ 141.715567] [<c1003e79>] dump_stack+0x16/0x18
[ 141.715573] [<c1034d6d>] print_circular_bug_tail+0x6f/0x71
[ 141.715578] [<c1035398>] check_prev_add+0x34/0x206
[ 141.715582] [<c10355d4>] check_prevs_add+0x6a/0xd5
[ 141.715586] [<c1036dd2>] __lock_acquire+0x61c/0xa05
[ 141.715591] [<c1037624>] lock_acquire+0x62/0x81
[ 141.715595] [<c1205c09>] __mutex_lock_slowpath+0x75/0x28c
[ 141.715599] [<c1205b88>] mutex_lock+0x8/0xa
[ 141.715602] [<c1098d79>] print_warning+0x8c/0x15d
[ 141.715606] [<c1099537>] dquot_alloc_space+0x184/0x189
[ 141.715612] [<c10a98e6>] ext3_new_blocks+0x44b/0x5a2
[ 141.715616] [<c10abe78>] ext3_alloc_blocks+0x40/0xdf
[ 141.715620] [<c10abf67>] ext3_alloc_branch+0x50/0x21b
[ 141.715624] [<c10ac445>] ext3_get_blocks_handle+0x1b8/0x367
[ 141.715629] [<c10ac66c>] ext3_get_block+0x78/0xe3
[ 141.715633] [<c108a239>] __block_prepare_write+0x168/0x3fd
[ 141.715638] [<c108ad10>] block_prepare_write+0x28/0x3b
[ 141.715641] [<c10acbcd>] ext3_prepare_write+0x3f/0x18d
[ 141.715647] [<c104dbe5>] generic_file_buffered_write+0x197/0x5e6
[ 141.715654] [<c104e2e2>] __generic_file_aio_write_nolock+0x2ae/0x5ad
[ 141.715658] [<c104e6ea>] generic_file_aio_write+0x58/0xc4
[ 141.715662] [<c10aa723>] ext3_file_write+0x2d/0xba
[ 141.715666] [<c1069441>] do_sync_write+0xc7/0x116
[ 141.715671] [<c1069612>] vfs_write+0x182/0x187
[ 141.715675] [<c10696b8>] sys_write+0x3d/0x64
[ 141.715679] [<c1002f78>] syscall_call+0x7/0xb
[ 141.715682] =======================
System is a P4 with HT, 3.2GHz, 2GB ram. Filesystem is ext3.
Folkert van Heusden
www.vanheusden.com/multitail - multitail is tail on steroids. multiple
windows, filtering, coloring, anything you can think of
----------------------------------------------------------------------
Phone: +31-6-41278122, PGP-key: 1F28D8AE, www.vanheusden.com
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