On Sun, 2007-10-14 at 00:36 +0200, Folkert van Heusden wrote:
> I've got a deja-vu feeling for this one but in any case:
>
>
> [ 7393.894980] =======================================================
> [ 7393.895081] [ INFO: possible circular locking dependency detected ]
> [ 7393.895130] 2.6.23.1 #2
> [ 7393.895175] -------------------------------------------------------
> [ 7393.895225] moo/28246 is trying to acquire lock:
> [ 7393.895275] (tty_mutex){--..}, at: [<c1231f9f>] mutex_lock+0x8/0xa
> [ 7393.895486]
> [ 7393.895487] but task is already holding lock:
> [ 7393.895578] (&s->s_dquot.dqptr_sem){----}, at: [<c10a76ab>] dquot_alloc_space+0x50/0x189
> [ 7393.895784]
> [ 7393.895785] which lock already depends on the new lock.
> [ 7393.895788]
> [ 7393.895915]
> [ 7393.895916] the existing dependency chain (in reverse order) is:
> [ 7393.896003]
> [ 7393.896005] -> #3 (&s->s_dquot.dqptr_sem){----}:
> [ 7393.896209] [<c103e375>] check_prev_add+0xc4/0x1fb
> [ 7393.896555] [<c103e537>] check_prevs_add+0x8b/0xe8
> [ 7393.896890] [<c103e7bf>] validate_chain+0x22b/0x354
> [ 7393.897223] [<c103fe7a>] __lock_acquire+0x1a0/0x74a
> [ 7393.897553] [<c1040895>] lock_acquire+0x6b/0x8a
> [ 7393.897882] [<c1036cef>] down_read+0x2b/0x3d
> [ 7393.898205] [<c10a76ab>] dquot_alloc_space+0x50/0x189
> [ 7393.898537] [<c10b90c7>] ext3_new_blocks+0x44b/0x5a2
> [ 7393.898868] [<c10bb6ac>] ext3_alloc_blocks+0x40/0xdf
> [ 7393.899194] [<c10bb79b>] ext3_alloc_branch+0x50/0x21b
> [ 7393.899527] [<c10bbc79>] ext3_get_blocks_handle+0x1b8/0x367
> [ 7393.899858] [<c10bbfa2>] ext3_getblk+0x97/0x228
> [ 7393.900186] [<c10bc14d>] ext3_bread+0x1a/0x78
> [ 7393.900514] [<c10c13a4>] ext3_mkdir+0xf2/0x270
> [ 7393.900851] [<c107fda3>] vfs_mkdir+0xb3/0x161
> [ 7393.901174] [<c107fedd>] sys_mkdirat+0x8c/0xc4
> [ 7393.901512] [<c107ff35>] sys_mkdir+0x20/0x22
> [ 7393.901841] [<c1003ffe>] syscall_call+0x7/0xb
> [ 7393.902169] [<ffffffff>] 0xffffffff
> [ 7393.902511]
> [ 7393.902512] -> #2 (&ei->truncate_mutex){--..}:
> [ 7393.902706] [<c103e375>] check_prev_add+0xc4/0x1fb
> [ 7393.903033] [<c103e537>] check_prevs_add+0x8b/0xe8
> [ 7393.903364] [<c103e7bf>] validate_chain+0x22b/0x354
> [ 7393.903700] [<c103fe7a>] __lock_acquire+0x1a0/0x74a
> [ 7393.904353] [<c1040895>] lock_acquire+0x6b/0x8a
> [ 7393.904682] [<c1232020>] __mutex_lock_slowpath+0x75/0x299
> [ 7393.905015] [<c1231f9f>] mutex_lock+0x8/0xa
> [ 7393.905339] [<c10bbb9a>] ext3_get_blocks_handle+0xd9/0x367
> [ 7393.905675] [<c10bbea0>] ext3_get_block+0x78/0xe3
> [ 7393.906009] [<c1097beb>] __block_prepare_write+0x168/0x415
> [ 7393.906339] [<c10986f7>] block_prepare_write+0x28/0x3b
> [ 7393.906673] [<c10bc34c>] ext3_prepare_write+0xe3/0x17e
> [ 7393.907002] [<c10579c5>] generic_file_buffered_write+0x1cb/0x62b
> [ 7393.907333] [<c105805f>] __generic_file_aio_write_nolock+0x23a/0x53d
> [ 7393.907667] [<c105846b>] generic_file_aio_write+0x58/0xc4
> [ 7393.907998] [<c10b9f1f>] ext3_file_write+0x2d/0xba
> [ 7393.908324] [<c1076303>] do_sync_write+0xc7/0x116
> [ 7393.908655] [<c10764aa>] vfs_write+0x158/0x15d
> [ 7393.908981] [<c1076550>] sys_write+0x3d/0x64
> [ 7393.909310] [<c1003ffe>] syscall_call+0x7/0xb
> [ 7393.909635] [<ffffffff>] 0xffffffff
> [ 7393.909974]
> [ 7393.909976] -> #1 (&inode->i_mutex){--..}:
> [ 7393.910163] [<c103e375>] check_prev_add+0xc4/0x1fb
> [ 7393.910496] [<c103e537>] check_prevs_add+0x8b/0xe8
> [ 7393.910823] [<c103e7bf>] validate_chain+0x22b/0x354
> [ 7393.911152] [<c103fe7a>] __lock_acquire+0x1a0/0x74a
> [ 7393.911478] [<c1040895>] lock_acquire+0x6b/0x8a
> [ 7393.911807] [<c1232020>] __mutex_lock_slowpath+0x75/0x299
> [ 7393.912137] [<c1231f9f>] mutex_lock+0x8/0xa
> [ 7393.912465] [<c10b7385>] get_node+0x21/0x4d
> [ 7393.912788] [<c10b7566>] devpts_get_tty+0xb/0x3b
> [ 7393.913398] [<c1141896>] init_dev+0x22b/0x58b
> [ 7393.913718] [<c114274e>] ptmx_open+0x90/0x1c9
> [ 7393.913992] [<c1078c01>] chrdev_open+0xaf/0x171
> [ 7393.914001] [<c1075456>] __dentry_open+0x152/0x1d3
> [ 7393.914008] [<c10755d5>] nameidata_to_filp+0x28/0x3f
> [ 7393.914018] [<c107551d>] do_filp_open+0x46/0x53
> [ 7393.914024] [<c107585a>] do_sys_open+0x54/0xda
> [ 7393.914031] [<c10758fc>] sys_open+0x1c/0x1e
> [ 7393.914038] [<c1003ffe>] syscall_call+0x7/0xb
> [ 7393.914046] [<ffffffff>] 0xffffffff
> [ 7393.914069]
> [ 7393.914070] -> #0 (tty_mutex){--..}:
> [ 7393.914074] [<c103e2e5>] check_prev_add+0x34/0x1fb
> [ 7393.914084] [<c103e537>] check_prevs_add+0x8b/0xe8
> [ 7393.914092] [<c103e7bf>] validate_chain+0x22b/0x354
> [ 7393.914103] [<c103fe7a>] __lock_acquire+0x1a0/0x74a
> [ 7393.914111] [<c1040895>] lock_acquire+0x6b/0x8a
> [ 7393.914117] [<c1232020>] __mutex_lock_slowpath+0x75/0x299
> [ 7393.914126] [<c1231f9f>] mutex_lock+0x8/0xa
> [ 7393.914134] [<c10a7039>] print_warning+0x8c/0x15d
> [ 7393.914143] [<c10a77df>] dquot_alloc_space+0x184/0x189
> [ 7393.914154] [<c10b90c7>] ext3_new_blocks+0x44b/0x5a2
> [ 7393.914162] [<c10bb6ac>] ext3_alloc_blocks+0x40/0xdf
> [ 7393.914170] [<c10bb79b>] ext3_alloc_branch+0x50/0x21b
> [ 7393.914177] [<c10bbc79>] ext3_get_blocks_handle+0x1b8/0x367
> [ 7393.914185] [<c10bbea0>] ext3_get_block+0x78/0xe3
> [ 7393.914195] [<c1097beb>] __block_prepare_write+0x168/0x415
> [ 7393.914203] [<c10986f7>] block_prepare_write+0x28/0x3b
> [ 7393.914211] [<c10bc34c>] ext3_prepare_write+0xe3/0x17e
> [ 7393.914218] [<c10579c5>] generic_file_buffered_write+0x1cb/0x62b
> [ 7393.914226] [<c105805f>] __generic_file_aio_write_nolock+0x23a/0x53d
> [ 7393.914238] [<c105846b>] generic_file_aio_write+0x58/0xc4
> [ 7393.914245] [<c10b9f1f>] ext3_file_write+0x2d/0xba
> [ 7393.914252] [<c1076303>] do_sync_write+0xc7/0x116
> [ 7393.914260] [<c10764aa>] vfs_write+0x158/0x15d
> [ 7393.914266] [<c1076550>] sys_write+0x3d/0x64
> [ 7393.914274] [<c1003ffe>] syscall_call+0x7/0xb
> [ 7393.914280] [<ffffffff>] 0xffffffff
> [ 7393.914290]
> [ 7393.914291] other info that might help us debug this:
> [ 7393.914293]
> [ 7393.914295] 3 locks held by moo/28246:
> [ 7393.914298] #0: (&inode->i_mutex){--..}, at: [<c1231f9f>] mutex_lock+0x8/0xa
> [ 7393.914305] #1: (&ei->truncate_mutex){--..}, at: [<c1231f9f>] mutex_lock+0x8/0xa
> [ 7393.914315] #2: (&s->s_dquot.dqptr_sem){----}, at: [<c10a76ab>] dquot_alloc_space+0x50/0x189
> [ 7393.914322]
> [ 7393.914323] stack backtrace:
> [ 7393.914325] [<c1004dcc>] show_trace_log_lvl+0x1a/0x30
> [ 7393.914330] [<c1004df4>] show_trace+0x12/0x14
> [ 7393.914334] [<c1004eee>] dump_stack+0x16/0x18
> [ 7393.914339] [<c103db51>] print_circular_bug_tail+0x6f/0x71
> [ 7393.914344] [<c103e2e5>] check_prev_add+0x34/0x1fb
> [ 7393.914348] [<c103e537>] check_prevs_add+0x8b/0xe8
> [ 7393.914354] [<c103e7bf>] validate_chain+0x22b/0x354
> [ 7393.914362] [<c103fe7a>] __lock_acquire+0x1a0/0x74a
> [ 7393.914365] [<c1040895>] lock_acquire+0x6b/0x8a
> [ 7393.914369] [<c1232020>] __mutex_lock_slowpath+0x75/0x299
> [ 7393.914373] [<c1231f9f>] mutex_lock+0x8/0xa
> [ 7393.914377] [<c10a7039>] print_warning+0x8c/0x15d
> [ 7393.914383] [<c10a77df>] dquot_alloc_space+0x184/0x189
> [ 7393.914387] [<c10b90c7>] ext3_new_blocks+0x44b/0x5a2
> [ 7393.914391] [<c10bb6ac>] ext3_alloc_blocks+0x40/0xdf
> [ 7393.914397] [<c10bb79b>] ext3_alloc_branch+0x50/0x21b
> [ 7393.914403] [<c10bbc79>] ext3_get_blocks_handle+0x1b8/0x367
> [ 7393.914407] [<c10bbea0>] ext3_get_block+0x78/0xe3
> [ 7393.914411] [<c1097beb>] __block_prepare_write+0x168/0x415
> [ 7393.914415] [<c10986f7>] block_prepare_write+0x28/0x3b
> [ 7393.914420] [<c10bc34c>] ext3_prepare_write+0xe3/0x17e
> [ 7393.914425] [<c10579c5>] generic_file_buffered_write+0x1cb/0x62b
> [ 7393.914429] [<c105805f>] __generic_file_aio_write_nolock+0x23a/0x53d
> [ 7393.914433] [<c105846b>] generic_file_aio_write+0x58/0xc4
> [ 7393.914440] [<c10b9f1f>] ext3_file_write+0x2d/0xba
> [ 7393.914445] [<c1076303>] do_sync_write+0xc7/0x116
> [ 7393.914448] [<c10764aa>] vfs_write+0x158/0x15d
> [ 7393.914452] [<c1076550>] sys_write+0x3d/0x64
> [ 7393.914455] [<c1003ffe>] syscall_call+0x7/0xb
> [ 7393.914460] =======================
>
I seems that patch hasn't made it into .23... I'll stick it in the
lockdep tree aimed at .24.
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