Hi,
Just hit this on sched-devel. (not sure how to reproduce it yet, can't
try now. I believe i can hit it on mainline as well as there is nothing
scheduler specific).
=======================================================
[ INFO: possible circular locking dependency detected ]
2.6.24-rc6 #1
-------------------------------------------------------
bash/17982 is trying to acquire lock:
(&journal->j_list_lock){--..}, at: [<c01f91a8>]
__journal_try_to_free_buffer+0x2a/0x8a
but task is already holding lock:
(inode_lock){--..}, at: [<c019d402>] drop_pagecache_sb+0x12/0x74
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #1 (inode_lock){--..}:
[<c0142ead>] check_prev_add+0xb8/0x1ad
[<c0142fff>] check_prevs_add+0x5d/0xcf
[<c01432f7>] validate_chain+0x286/0x300
[<c0144ec6>] __lock_acquire+0x67f/0x6ff
[<c01454ee>] lock_acquire+0x71/0x8b
[<c0428cf2>] _spin_lock+0x2b/0x38
[<c019c4a0>] __mark_inode_dirty+0xd0/0x15b
[<c01a0243>] __set_page_dirty+0x10c/0x11b
[<c01a0a2f>] mark_buffer_dirty+0x9a/0xa1
[<c01f910f>] __journal_temp_unlink_buffer+0xbf/0xc3
[<c01f911e>] __journal_unfile_buffer+0xb/0x15
[<c01f9758>] __journal_refile_buffer+0x3c/0x86
[<c01fa4bf>] journal_commit_transaction+0x89c/0xa05
[<c01fbe3d>] kjournald+0xab/0x1ff
[<c013a36a>] kthread+0x37/0x59
[<c0105b47>] kernel_thread_helper+0x7/0x10
[<ffffffff>] 0xffffffff
-> #0 (&journal->j_list_lock){--..}:
[<c0142e23>] check_prev_add+0x2e/0x1ad
[<c0142fff>] check_prevs_add+0x5d/0xcf
[<c01432f7>] validate_chain+0x286/0x300
[<c0144ec6>] __lock_acquire+0x67f/0x6ff
[<c01454ee>] lock_acquire+0x71/0x8b
[<c0428cf2>] _spin_lock+0x2b/0x38
[<c01f91a8>] __journal_try_to_free_buffer+0x2a/0x8a
[<c01f9269>] journal_try_to_free_buffers+0x61/0x9e
[<c01ebd01>] ext3_releasepage+0x68/0x74
[<c015f528>] try_to_release_page+0x33/0x47
[<c0165570>] invalidate_complete_page+0x1e/0x35
[<c01658c8>] __invalidate_mapping_pages+0x6b/0xc2
[<c019d43c>] drop_pagecache_sb+0x4c/0x74
[<c019d4ae>] drop_pagecache+0x4a/0x78
[<c019d530>] drop_caches_sysctl_handler+0x36/0x4e
[<c01b5d57>] proc_sys_write+0x6b/0x85
[<c0183c05>] vfs_write+0x8c/0x10b
[<c0183d22>] sys_write+0x3d/0x61
[<c0104e36>] sysenter_past_esp+0x5f/0xa5
[<ffffffff>] 0xffffffff
other info that might help us debug this:
2 locks held by bash/17982:
#0: (&type->s_umount_key#15){----}, at: [<c019d4a1>]
drop_pagecache+0x3d/0x78
#1: (inode_lock){--..}, at: [<c019d402>] drop_pagecache_sb+0x12/0x74
stack backtrace:
Pid: 17982, comm: bash Not tainted 2.6.24-rc6 #1
[<c0105c83>] show_trace_log_lvl+0x19/0x2e
[<c0105caa>] show_trace+0x12/0x14
[<c0105de6>] dump_stack+0x6c/0x72
[<c0142700>] print_circular_bug_tail+0x5f/0x68
[<c0142e23>] check_prev_add+0x2e/0x1ad
[<c0142fff>] check_prevs_add+0x5d/0xcf
[<c01432f7>] validate_chain+0x286/0x300
[<c0144ec6>] __lock_acquire+0x67f/0x6ff
[<c01454ee>] lock_acquire+0x71/0x8b
[<c0428cf2>] _spin_lock+0x2b/0x38
[<c01f91a8>] __journal_try_to_free_buffer+0x2a/0x8a
[<c01f9269>] journal_try_to_free_buffers+0x61/0x9e
[<c01ebd01>] ext3_releasepage+0x68/0x74
[<c015f528>] try_to_release_page+0x33/0x47
[<c0165570>] invalidate_complete_page+0x1e/0x35
[<c01658c8>] __invalidate_mapping_pages+0x6b/0xc2
[<c019d43c>] drop_pagecache_sb+0x4c/0x74
[<c019d4ae>] drop_pagecache+0x4a/0x78
[<c019d530>] drop_caches_sysctl_handler+0x36/0x4e
[<c01b5d57>] proc_sys_write+0x6b/0x85
[<c0183c05>] vfs_write+0x8c/0x10b
[<c0183d22>] sys_write+0x3d/0x61
[<c0104e36>] sysenter_past_esp+0x5f/0xa5
=======================
[root@llm11 kernel]#
Last thing I did was echo 1 > /proc/sys/vm/drop_cache
(Not sure whom to cc, hopefully others will know better, also no time to
debug further, sorry!)
--
regards,
Dhaval
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