CIFS & Lockdep warnings

[Srihari Vijayaraghavan <sriharivijayaraghavan@yahoo.com.au>]

This is observed on 2.6.18-rc4 on SUSE 10.1 x86 on
P-IV. The volume is question was mounted from a
Windows 2003 server.

=======================================================
[ INFO: possible circular locking dependency detected
]
-------------------------------------------------------
cp/11790 is trying to acquire lock:
 (iprune_mutex){--..}, at: [<c029e364>]
mutex_lock+0x19/0x20

but task is already holding lock:
 (&inode->i_mutex){--..}, at: [<c029e364>]
mutex_lock+0x19/0x20

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #1 (&inode->i_mutex){--..}:
       [<c012a1c0>] lock_acquire+0x56/0x73
       [<c029e205>] __mutex_lock_slowpath+0xa6/0x1ec
       [<c029e364>] mutex_lock+0x19/0x20
       [<e3cd2b7a>] ntfs_put_inode+0x3e/0x79 [ntfs]
       [<c0169ac1>] iput+0x33/0x70
       [<c017738e>] inotify_unmount_inodes+0x12e/0x15f
       [<c016a55c>] invalidate_inodes+0x38/0xd1
       [<c01599b3>] generic_shutdown_super+0x5a/0x108
       [<c0159a81>] kill_block_super+0x20/0x36
       [<c0159b56>] deactivate_super+0x61/0x78
       [<c016c561>] mntput_no_expire+0x44/0x78
       [<c015f536>] path_release_on_umount+0x16/0x1d
       [<c016d692>] sys_umount+0x1d2/0x208
       [<c016d6d5>] sys_oldumount+0xd/0xf
       [<c0102cfb>] syscall_call+0x7/0xb

-> #0 (iprune_mutex){--..}:
       [<c012a1c0>] lock_acquire+0x56/0x73
       [<c029e205>] __mutex_lock_slowpath+0xa6/0x1ec
       [<c029e364>] mutex_lock+0x19/0x20
       [<c016a3a2>] shrink_icache_memory+0x33/0x1b5
       [<c0142b56>] shrink_slab+0xce/0x125
       [<c0143385>] try_to_free_pages+0x125/0x1cc
       [<c013f8a8>] __alloc_pages+0x184/0x26d
       [<c013ca52>]
generic_file_buffered_write+0x15a/0x53d
       [<c013d175>]
__generic_file_aio_write_nolock+0x340/0x38d
       [<c013d223>] generic_file_aio_write+0x61/0xb3
       [<e3d8a326>] cifs_file_aio_write+0x23/0x43
[cifs]
       [<c0153bb3>] do_sync_write+0x9d/0xce
       [<c0154437>] vfs_write+0xaa/0x14e
       [<c015496e>] sys_write+0x3a/0x61
       [<c0102cfb>] syscall_call+0x7/0xb

other info that might help us debug this:

2 locks held by cp/11790:
 #0:  (&inode->i_mutex){--..}, at: [<c029e364>]
mutex_lock+0x19/0x20
 #1:  (shrinker_rwsem){----}, at: [<c0142aa8>]
shrink_slab+0x20/0x125

stack backtrace:
 [<c01033da>] show_trace_log_lvl+0x57/0x157
 [<c0103a28>] show_trace+0x16/0x19
 [<c0103ac9>] dump_stack+0x1a/0x1f
 [<c0129551>] print_circular_bug_tail+0x59/0x64
 [<c0129d6e>] __lock_acquire+0x812/0x9a3
 [<c012a1c0>] lock_acquire+0x56/0x73
 [<c029e205>] __mutex_lock_slowpath+0xa6/0x1ec
 [<c029e364>] mutex_lock+0x19/0x20
 [<c016a3a2>] shrink_icache_memory+0x33/0x1b5
 [<c0142b56>] shrink_slab+0xce/0x125
 [<c0143385>] try_to_free_pages+0x125/0x1cc
 [<c013f8a8>] __alloc_pages+0x184/0x26d
 [<c013ca52>] generic_file_buffered_write+0x15a/0x53d
 [<c013d175>]
__generic_file_aio_write_nolock+0x340/0x38d
 [<c013d223>] generic_file_aio_write+0x61/0xb3
 [<e3d8a326>] cifs_file_aio_write+0x23/0x43 [cifs]
 [<c0153bb3>] do_sync_write+0x9d/0xce
 [<c0154437>] vfs_write+0xaa/0x14e
 [<c015496e>] sys_write+0x3a/0x61
 [<c0102cfb>] syscall_call+0x7/0xb
DWARF2 unwinder stuck at syscall_call+0x7/0xb
Leftover inexact backtrace:
 [<c0103a28>] show_trace+0x16/0x19
 [<c0103ac9>] dump_stack+0x1a/0x1f
 [<c0129551>] print_circular_bug_tail+0x59/0x64
 [<c0129d6e>] __lock_acquire+0x812/0x9a3
 [<c012a1c0>] lock_acquire+0x56/0x73
 [<c029e205>] __mutex_lock_slowpath+0xa6/0x1ec
 [<c029e364>] mutex_lock+0x19/0x20
 [<c016a3a2>] shrink_icache_memory+0x33/0x1b5
 [<c0142b56>] shrink_slab+0xce/0x125
 [<c0143385>] try_to_free_pages+0x125/0x1cc
 [<c013f8a8>] __alloc_pages+0x184/0x26d
 [<c013ca52>] generic_file_buffered_write+0x15a/0x53d
 [<c013d175>]
__generic_file_aio_write_nolock+0x340/0x38d
 [<c013d223>] generic_file_aio_write+0x61/0xb3
 [<e3d8a326>] cifs_file_aio_write+0x23/0x43 [cifs]
 [<c0153bb3>] do_sync_write+0x9d/0xce
 [<c0154437>] vfs_write+0xaa/0x14e
 [<c015496e>] sys_write+0x3a/0x61
 [<c0102cfb>] syscall_call+0x7/0xb

More info on request.

Thanks


		
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