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Subject2.5.63 BUG in deadline-iosched.c
I got this on 2.5.63 while running the "find" command:

kernel BUG at drivers/block/deadline-iosched.c:145!
invalid operand: 0000
CPU: 3
EIP: 0060:[<c026f8a1>] Not tainted
EFLAGS: 00010046
EIP is at deadline_find_drq_hash+0x41/0xb0
eax: f76fe060 ebx: f76fe058 ecx: f76fe060 edx: 00000000
esi: f76fe060 edi: f76fe044 ebp: f76fe050 esp: f7e27c88
ds: 007b es: 007b ss: 0068
Process pdflush (pid: 16, threadinfo=f7e26000 task=c3b39300)
Stack: 010d7ce6 00000000 f7fd2ae0 f7fd2ae0 f7fd2ae0 f7747f80 c026fbc9
010d7ce6 00000000 f7747f80 00000000 f7759000 f7759000 00000008
f7759000 f7e27cf8 f7fd2ae0 c026cc58 f7759000 f7e27cf8 f7fd2ae0
Call Trace:
[<c026fbc9>] deadline_merge+0x49/0x120
[<c026a438>] elv_merge+0x18/0x30
[<c026cc58>] __make_request+0xb8/0x440
[<c014dd96>] bio_alloc+0x126/0x1b0
[<c026d1ad>] generic_make_request+0x1cd/0x1e0
[<c026d239>] submit_bio+0x79/0x90
[<c014bd34>] __block_write_full_page+0x284/0x400
[<c014d342>] block_write_full_page+0x32/0xc0
[<c014f990>] blkdev_get_block+0x0/0x60
[<c017d55c>] ext3_writepage+0x25c/0x300
[<c014fae4>] blkdev_writepage+0x14/0x20
[<c014f990>] blkdev_get_block+0x0/0x60
[<c0166dd0>] mpage_writepages+0x1c0/0x2ab
[<c014fad0>] blkdev_writepage+0x0/0x20
[<c011ec8b>] do_softirq+0x5b/0xc0
[<c0150c11>] generic_writepages+0x11/0x15
[<c0134e46>] do_writepages+0x16/0x30
[<c0165548>] __sync_single_inode+0xc8/0x210
[<c01658aa>] sync_sb_inodes+0x16a/0x210
[<c01659a4>] writeback_inodes+0x54/0x90
[<c0134d05>] wb_kupdate+0xa5/0x100
[<c013537f>] __pdflush+0xff/0x1a0
[<c0135420>] pdflush+0x0/0x10
[<c013542b>] pdflush+0xb/0x10
[<c0134c60>] wb_kupdate+0x0/0x100
[<c0106fe0>] kernel_thread_helper+0x0/0x10
[<c0106fe5>] kernel_thread_helper+0x5/0x10

Code: 0f 0b 91 00 a0 f8 3c c0 8b 43 08 83 e0 7c 83 f8 10 75 09 8b

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