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kernel BUG at /home/fabio/w/bfq/cfq/block/cfq-iosched.c:1506!
invalid opcode: 0000 [#1] PREEMPT 
Modules linked in: cfq_iosched fan ac battery thermal button processor [last unloaded: cfq_iosched]

Pid: 3475, comm: tiotest Not tainted (2.6.25-rc8 #4)
EIP: 0060:[<d9019a78>] EFLAGS: 00010083 CPU: 0
EIP is at cfq_cic_lookup+0x2b/0x119 [cfq_iosched]
EAX: d7b8a5f4 EBX: d7b8a5f4 ECX: d901a6e1 EDX: d82989f0
ESI: d82989f0 EDI: d7af1af0 EBP: d8157380 ESP: d7af1a6c
 DS: 007b ES: 007b FS: 0000 GS: 0033 SS: 0068
Process tiotest (pid: 3475, ti=d7af0000 task=d7aa4e70 task.ti=d7af0000)
Stack: 00000000 d80a2df4 00000001 d80a2d98 d7af1af0 00000001 d901a6fb d80a2d98 
       c02a5dd1 d80a2d98 c02a7e8a d7aa4e70 c02a8465 d79ebac0 00000001 d80a2da8 
       d80a2de4 00000002 00000000 d80a2d98 d7af1af0 d79ebac0 c02a8474 00000010 
Call Trace:
 [<d901a6fb>] cfq_may_queue+0x1a/0xad [cfq_iosched]
 [<c02a5dd1>] elv_may_queue+0x15/0x17
 [<c02a7e8a>] get_request+0x24/0x258
 [<c02a8465>] get_request_wait+0x7b/0x138
 [<c02a8474>] get_request_wait+0x8a/0x138
 [<c0224134>] autoremove_wake_function+0x0/0x2b
 [<c02a89a8>] __make_request+0x28d/0x33b
 [<c02a79ef>] generic_make_request+0x2f4/0x321
 [<c0203c8f>] restore_nocheck+0x12/0x15
 [<c023a296>] mempool_alloc+0x3a/0xd2
 [<c02a8b83>] submit_bio+0xd5/0xdb
 [<c026becd>] bio_alloc_bioset+0x8c/0xe6
 [<c0268a05>] submit_bh+0xb5/0xd1
 [<c026a441>] __block_write_full_page+0x1be/0x2a0
 [<c0282f41>] ext3_get_block+0x0/0xb7
 [<c026a5ea>] block_write_full_page+0xc7/0xd0
 [<c0282f41>] ext3_get_block+0x0/0xb7
 [<c028426b>] ext3_ordered_writepage+0xa0/0x10c
 [<c0281b37>] bget_one+0x0/0x6
 [<c023cacc>] __writepage+0x8/0x1f
 [<c023cf49>] write_cache_pages+0x16a/0x277
 [<c023cac4>] __writepage+0x0/0x1f
 [<c023d070>] generic_writepages+0x1a/0x21
 [<c023d0a0>] do_writepages+0x29/0x30
 [<c02656f6>] __writeback_single_inode+0x132/0x22f
 [<c0265ba3>] sync_sb_inodes+0x203/0x255
 [<c03b3c80>] _spin_lock+0x21/0x2c
 [<c0265b34>] sync_sb_inodes+0x194/0x255
 [<c0265da0>] writeback_inodes+0x68/0xb3
 [<c023d47a>] balance_dirty_pages_ratelimited_nr+0x120/0x243
 [<c0238b4d>] generic_file_buffered_write+0x192/0x574
 [<c022d198>] __lock_acquire+0xb84/0xba0
 [<c0239395>] __generic_file_aio_write_nolock+0x466/0x4b2
 [<c03b2d4d>] mutex_lock_nested+0x20e/0x216
 [<c0239431>] generic_file_aio_write+0x50/0xba
 [<c0239444>] generic_file_aio_write+0x63/0xba
 [<c0280c6d>] ext3_file_write+0x19/0x83
 [<c024ecf9>] do_sync_write+0xbd/0x104
 [<c0224134>] autoremove_wake_function+0x0/0x2b
 [<c024ec3c>] do_sync_write+0x0/0x104
 [<c024f36c>] vfs_write+0x73/0xa6
 [<c024f773>] sys_write+0x3c/0x63
 [<c0203c2e>] syscall_call+0x7/0xb
 [<c026bf9b>] bio_fs_destructor+0x0/0xb
 =======================
Code: 55 89 c5 57 56 89 d6 53 31 db 83 ec 08 85 d2 0f 84 fb 00 00 00 8b 42 44 85 c0 74 13 39 28 89 c3 75 0d 39 50 10 0f 84 e5 00 00 00 <0f> 0b eb fe 8d 46 34 89 44 24 04 8d 46 08 89 04 24 b8 01 00 00 
EIP: [<d9019a78>] cfq_cic_lookup+0x2b/0x119 [cfq_iosched] SS:ESP 0068:d7af1a6c
---[ end trace 0af24d5d4f16f777 ]---