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Date: Thu, 28 Oct 2010 11:32:46 -0400
From: Valdis.Kletnieks@...edu
To: Andrew Morton <akpm@...ux-foundation.org>, Jan Kara <jack@...e.cz>
Cc: linux-kernel@...r.kernel.org
Subject: mmotm 2010-10-22 - lockdep splat in quota code
On Fri, 22 Oct 2010 16:36:58 PDT, akpm@...ux-foundation.org said:
> The mm-of-the-moment snapshot 2010-10-22-16-36 has been uploaded to
>
> http://userweb.kernel.org/~akpm/mmotm/
I turned on quotas on some ext4 filesystems, and the next boot, shortly after
the 'quotaon -a', I got:
[ 40.163251] =======================================================
[ 40.163558] [ INFO: possible circular locking dependency detected ]
[ 40.164019] 2.6.36-mmotm1022 #3
[ 40.164019] -------------------------------------------------------
[ 40.164019] dd/2915 is trying to acquire lock:
[ 40.164019] (&s->s_dquot.dqio_mutex){+.+...}, at: [<ffffffff8113fec8>] dquot_commit+0x26/0xda
[ 40.164019]
[ 40.164019] but task is already holding lock:
[ 40.164019] (&s->s_dquot.dqptr_sem){++++..}, at: [<ffffffff81140c1c>] __dquot_free_space+0x66/0x16b
[ 40.164019]
[ 40.164019] which lock already depends on the new lock.
[ 40.164019]
[ 40.164019]
[ 40.164019] the existing dependency chain (in reverse order) is:
[ 40.164019]
[ 40.164019] -> #2 (&s->s_dquot.dqptr_sem){++++..}:
[ 40.164019] [<ffffffff8106b270>] lock_acquire+0x100/0x126
[ 40.164019] [<ffffffff8156159c>] down_read+0x42/0x51
[ 40.164019] [<ffffffff81140c1c>] __dquot_free_space+0x66/0x16b
[ 40.164019] [<ffffffff81197030>] dquot_free_block+0x19/0x2a
[ 40.164019] [<ffffffff8119d499>] ext4_free_blocks+0x7eb/0x8a2
[ 40.164019] [<ffffffff811948b6>] ext4_ext_truncate+0x3af/0x853
[ 40.164019] [<ffffffff81179347>] ext4_truncate+0x98/0x51a
[ 40.164019] [<ffffffff810c452e>] vmtruncate+0x3f/0x4b
[ 40.164019] [<ffffffff8117a27c>] ext4_setattr+0x313/0x397
[ 40.164019] [<ffffffff8110be41>] notify_change+0x1a1/0x2a1
[ 40.164019] [<ffffffff810f44e6>] do_truncate+0x67/0x84
[ 40.164019] [<ffffffff81102680>] do_last+0x4c6/0x5a6
[ 40.164019] [<ffffffff811029b2>] do_filp_open+0x252/0x655
[ 40.164019] [<ffffffff810f4f61>] do_sys_open+0x60/0x101
[ 40.164019] [<ffffffff810f501d>] sys_open+0x1b/0x1d
[ 40.164019] [<ffffffff810027eb>] system_call_fastpath+0x16/0x1b
[ 40.164019]
[ 40.164019] -> #1 (&ei->i_data_sem){++++..}:
[ 40.164019] [<ffffffff8106b270>] lock_acquire+0x100/0x126
[ 40.164019] [<ffffffff8156159c>] down_read+0x42/0x51
[ 40.164019] [<ffffffff8117869c>] ext4_map_blocks+0x3e/0x20e
[ 40.164019] [<ffffffff81179124>] ext4_getblk+0x71/0x19b
[ 40.164019] [<ffffffff8117925f>] ext4_bread+0x11/0x61
[ 40.164019] [<ffffffff81188778>] ext4_quota_read+0x86/0xf0
[ 40.164019] [<ffffffff81143681>] v2_read_header+0x1e/0x4f
[ 40.164019] [<ffffffff81143b2e>] v2_read_file_info+0x20/0x2ae
[ 40.164019] [<ffffffff8114292f>] vfs_load_quota_inode+0x295/0x44b
[ 40.164019] [<ffffffff81142d18>] dquot_quota_on_path+0x4c/0x55
[ 40.164019] [<ffffffff8118918d>] ext4_quota_on+0x123/0x175
[ 40.164019] [<ffffffff811452f2>] do_quotactl+0x1d1/0x465
[ 40.164019] [<ffffffff81145683>] sys_quotactl+0xfd/0x11a
[ 40.164019] [<ffffffff810027eb>] system_call_fastpath+0x16/0x1b
[ 40.164019]
[ 40.164019] -> #0 (&s->s_dquot.dqio_mutex){+.+...}:
[ 40.164019] [<ffffffff8106aa5c>] __lock_acquire+0xa53/0xd55
[ 40.164019] [<ffffffff8106b270>] lock_acquire+0x100/0x126
[ 40.164019] [<ffffffff81560b46>] __mutex_lock_common+0x5d/0x56c
[ 40.164019] [<ffffffff815610fb>] mutex_lock_nested+0x34/0x39
[ 40.164019] [<ffffffff8113fec8>] dquot_commit+0x26/0xda
[ 40.164019] [<ffffffff8118ab0e>] ext4_write_dquot+0x65/0x87
[ 40.164019] [<ffffffff8118ab6e>] ext4_mark_dquot_dirty+0x3e/0x49
[ 40.164019] [<ffffffff8113fb9c>] mark_all_dquot_dirty+0x22/0x48
[ 40.164019] [<ffffffff81140cef>] __dquot_free_space+0x139/0x16b
[ 40.164019] [<ffffffff81197030>] dquot_free_block+0x19/0x2a
[ 40.164019] [<ffffffff8119d499>] ext4_free_blocks+0x7eb/0x8a2
[ 40.164019] [<ffffffff811948b6>] ext4_ext_truncate+0x3af/0x853
[ 40.164019] [<ffffffff81179347>] ext4_truncate+0x98/0x51a
[ 40.164019] [<ffffffff810c452e>] vmtruncate+0x3f/0x4b
[ 40.164019] [<ffffffff8117a27c>] ext4_setattr+0x313/0x397
[ 40.164019] [<ffffffff8110be41>] notify_change+0x1a1/0x2a1
[ 40.684030] [<ffffffff810f44e6>] do_truncate+0x67/0x84
[ 40.684030] [<ffffffff81102680>] do_last+0x4c6/0x5a6
[ 40.684030] [<ffffffff811029b2>] do_filp_open+0x252/0x655
[ 40.684030] [<ffffffff810f4f61>] do_sys_open+0x60/0x101
[ 40.684030] [<ffffffff810f501d>] sys_open+0x1b/0x1d
[ 40.684030] [<ffffffff810027eb>] system_call_fastpath+0x16/0x1b
[ 40.684030]
[ 40.684030] other info that might help us debug this:
[ 40.684030]
[ 40.684030] 5 locks held by dd/2915:
[ 40.684030] #0: (&sb->s_type->i_mutex_key#13){+.+.+.}, at: [<ffffffff810f44da>] do_truncate+0x5b/0x84
[ 40.684030] #1: (&sb->s_type->i_alloc_sem_key#5){+.+...}, at: [<ffffffff8110be29>] notify_change+0x189/0x2a1
[ 40.684030] #2: (jbd2_handle){+.+...}, at: [<ffffffff811aa8f4>] start_this_handle+0x57a/0x605
[ 40.684030] #3: (&ei->i_data_sem){++++..}, at: [<ffffffff81194598>] ext4_ext_truncate+0x91/0x853
[ 40.684030] #4: (&s->s_dquot.dqptr_sem){++++..}, at: [<ffffffff81140c1c>] __dquot_free_space+0x66/0x16b
[ 40.684030]
[ 40.684030] stack backtrace:
[ 40.684030] Pid: 2915, comm: dd Not tainted 2.6.36-mmotm1022 #3
[ 40.684030] Call Trace:
[ 40.684030] [<ffffffff810693b9>] print_circular_bug+0xa8/0xb7
[ 40.684030] [<ffffffff8106aa5c>] __lock_acquire+0xa53/0xd55
[ 40.684030] [<ffffffff8113fec8>] ? dquot_commit+0x26/0xda
[ 40.684030] [<ffffffff8106b270>] lock_acquire+0x100/0x126
[ 40.684030] [<ffffffff8113fec8>] ? dquot_commit+0x26/0xda
[ 40.684030] [<ffffffff81560b46>] __mutex_lock_common+0x5d/0x56c
[ 40.684030] [<ffffffff8113fec8>] ? dquot_commit+0x26/0xda
[ 40.684030] [<ffffffff811401d9>] ? dquot_mark_dquot_dirty+0x27/0x7a
[ 40.684030] [<ffffffff8113fec8>] ? dquot_commit+0x26/0xda
[ 40.684030] [<ffffffff815610fb>] mutex_lock_nested+0x34/0x39
[ 40.684030] [<ffffffff8113fec8>] dquot_commit+0x26/0xda
[ 40.684030] [<ffffffff8118ab0e>] ext4_write_dquot+0x65/0x87
[ 40.684030] [<ffffffff8118ab6e>] ext4_mark_dquot_dirty+0x3e/0x49
[ 40.684030] [<ffffffff8113fb9c>] mark_all_dquot_dirty+0x22/0x48
[ 40.684030] [<ffffffff81140cef>] __dquot_free_space+0x139/0x16b
[ 40.684030] [<ffffffff81197030>] dquot_free_block+0x19/0x2a
[ 40.684030] [<ffffffff8119d499>] ext4_free_blocks+0x7eb/0x8a2
[ 40.684030] [<ffffffff811aad5d>] ? jbd2_journal_extend+0x5d/0xb8
[ 40.684030] [<ffffffff811948b6>] ext4_ext_truncate+0x3af/0x853
[ 40.684030] [<ffffffff810a54dd>] ? trace_preempt_on+0x15/0x28
[ 40.684030] [<ffffffff810d6416>] ? unmap_mapping_range+0x279/0x288
[ 40.684030] [<ffffffff81179347>] ext4_truncate+0x98/0x51a
[ 40.684030] [<ffffffff810d6416>] ? unmap_mapping_range+0x279/0x288
[ 40.684030] [<ffffffff8106b691>] ? trace_hardirqs_on_caller+0x117/0x13b
[ 40.684030] [<ffffffff8106b6c2>] ? trace_hardirqs_on+0xd/0xf
[ 40.684030] [<ffffffff810c452e>] vmtruncate+0x3f/0x4b
[ 40.684030] [<ffffffff8117a27c>] ext4_setattr+0x313/0x397
[ 40.684030] [<ffffffff8110be41>] notify_change+0x1a1/0x2a1
[ 40.684030] [<ffffffff810f44e6>] do_truncate+0x67/0x84
[ 40.684030] [<ffffffff810ff595>] ? get_write_access+0x49/0x50
[ 40.684030] [<ffffffff8156271c>] ? _raw_spin_unlock+0x30/0x69
[ 40.684030] [<ffffffff81565fbb>] ? sub_preempt_count+0x35/0x48
[ 40.684030] [<ffffffff811dd86a>] ? security_path_truncate+0x48/0x4d
[ 40.684030] [<ffffffff81102680>] do_last+0x4c6/0x5a6
[ 40.684030] [<ffffffff811029b2>] do_filp_open+0x252/0x655
[ 40.684030] [<ffffffff810a54dd>] ? trace_preempt_on+0x15/0x28
[ 40.684030] [<ffffffff8110d026>] ? alloc_fd+0x17c/0x18e
[ 40.684030] [<ffffffff8156271c>] ? _raw_spin_unlock+0x30/0x69
[ 40.684030] [<ffffffff81565fbb>] ? sub_preempt_count+0x35/0x48
[ 40.684030] [<ffffffff8110d026>] ? alloc_fd+0x17c/0x18e
[ 40.684030] [<ffffffff810f4f61>] do_sys_open+0x60/0x101
[ 40.684030] [<ffffffff81561f65>] ? trace_hardirqs_on_thunk+0x3a/0x3f
[ 40.684030] [<ffffffff810f501d>] sys_open+0x1b/0x1d
[ 40.684030] [<ffffffff810027eb>] system_call_fastpath+0x16/0x1b
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