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SubjectRe: PROBLEM: 2.6.0-test10 BUG/panic in mpage_end_io_read

It just happened again in 2.6.0-test11. :(

The trace has a slightly different code path:

---------------------------------- BUG ------------------------------------
kernel BUG at mm/filemap.c:332!
invalid operand: 0000 [#1]
CPU: 0
EIP: 0060:[<c0130f4a>] Not tainted
EFLAGS: 00010246
EIP is at unlock_page+0x1a/0x40
eax: 00000000 ebx: c1298060 ecx: 00000017 edx: c1500400
esi: c1501204 edi: 00000001 ebp: 00000003 esp: dfcc1f0c
ds: 007b es: 007b ss: 0068
Process md0_raid5 (pid: 17, threadinfo=dfcc0000 task=dfcdd2d0)
Stack: dffd2784 dffd49c0 c016201e dffd49c0 c16d0ba8 ffffffff c16d0ba8 c02a3195
dffd49c0 00000000 00000000 c16d0ba8 dfd20b00 dff7ae00 dfd20b08 dfdee6b0
dfcc1f70 c0119247 dff7ae74 00000000 00000002 00000001 00000004 ffffffff
Call Trace:
[<c016201e>] mpage_end_io_read+0x5e/0x80
[<c02a3195>] handle_stripe+0x9e5/0xb30
[<c0119247>] recalc_task_prio+0x147/0x160
[<c02a363c>] raid5d+0xec/0x110
[<c02a9d19>] md_thread+0xf9/0x140
[<c02a9c20>] md_thread+0x0/0x140
[<c0119ea0>] default_wake_function+0x0/0x20
[<c010725d>] kernel_thread_helper+0x5/0x18

Code: 0f 0b 4c 01 79 87 30 c0 8d 46 04 39 46 04 74 0e 31 c9 ba 03
-------------------------------- END BUG ----------------------------------

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