root@cl045 root]# ------------[ cut here ]------------
kernel BUG at drivers/block/as-iosched.c:302!
invalid operand: 0000 [#1]
CPU:    0
EIP:    0060:[<c021a880>]    Not tainted
EFLAGS: 00010046
EIP is at as_find_arq_hash+0x80/0x90
eax: 00000000   ebx: d2fc8ed4   ecx: d2fc8ed4   edx: d2fc8eb8
esi: d2fc9ec0   edi: c17319e0   ebp: 007c054f   esp: dd4fdae0
ds: 007b   es: 007b   ss: 0068
Process mkfs.ext2 (pid: 1276, threadinfo=dd4fc000 task=df5b06f0)
Stack: c4acd320 c1731a00 007c0551 00000000 c021bf54 dfd3cbc0 007c054f d41d6a98 
       c0215a49 dfd3cbc0 00000000 c1731a00 d41d6a98 00000001 c0213709 c1731a00 
       dd4fdb4c c4acd320 c0216578 c1731a00 dd4fdb4c c4acd320 00000000 007c054f 
Call Trace:
 [<c021bf54>] as_merge+0xe4/0x170
 [<c0215a49>] get_request+0x1b9/0x2a0
 [<c0213709>] elv_merge+0x29/0x30
 [<c0216578>] __make_request+0x338/0x580
 [<c02168d5>] generic_make_request+0x115/0x1a0
 [<c0119ebd>] smp_apic_timer_interrupt+0xdd/0x150
 [<c015d917>] bio_alloc+0xd7/0x1c0
 [<c02169b4>] submit_bio+0x54/0xa0
 [<c015b660>] __block_write_full_page+0x270/0x470
 [<c015ceda>] block_write_full_page+0xfa/0x120
 [<c015fcc0>] blkdev_get_block+0x0/0x60
 [<c015fe3f>] blkdev_writepage+0x1f/0x30
 [<c015fcc0>] blkdev_get_block+0x0/0x60
 [<c017a308>] mpage_writepages+0x208/0x2db
 [<c015fe20>] blkdev_writepage+0x0/0x30
 [<c016102f>] generic_writepages+0x1f/0x23
 [<c014198e>] do_writepages+0x1e/0x40
 [<c0178866>] __sync_single_inode+0xc6/0x220
 [<c0178c1c>] sync_sb_inodes+0x1ac/0x270
 [<c0178d4a>] writeback_inodes+0x6a/0xa0
 [<c0141438>] balance_dirty_pages+0xb8/0x160
 [<c013e1ad>] generic_file_aio_write_nolock+0x4cd/0xac0
 [<c013cbf1>] file_read_actor+0xe1/0x100
 [<c010b96e>] apic_timer_interrupt+0x1a/0x20
 [<c013e81e>] generic_file_write_nolock+0x7e/0xa0
 [<c011e8e0>] default_wake_function+0x0/0x30
 [<c012a906>] update_wall_time+0x16/0x40
 [<c012ad30>] do_timer+0xc0/0xd0
 [<c0111826>] timer_interrupt+0x56/0x110
 [<c0160dd7>] blkdev_file_write+0x37/0x40
 [<c015844e>] vfs_write+0xbe/0x130
 [<c0158572>] sys_write+0x42/0x70
 [<c010af2d>] sysenter_past_esp+0x52/0x71

Code: 0f 0b 2e 01 49 bf 30 c0 eb b5 8d b6 00 00 00 00 8b 54 24 08