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Subjectdisk I/O hang in 2.6.0-test4-mm5

I'm seeing a mkfs.ext2 that never completes under 2.6.0-test4-mm5.
I ran 4 mkfs.ext2's concurrntly, each on a seperate partition on the
same disk. Three of the completed. Here's the sysrq stack trace from
the one that didn't.

This doesn't occur on mm4.

mkfs.ext2 D 00000000 16474 16431 (NOTLB)
f19cbef0 00000086 f6200ce0 00000000 00000003 c0127852 00000000 c3671bc0
c3671bc0 0000000d f19cbf28 f19cbefc c011fa08 c184ab20 c360d09c c014007c
c184ab20 00000000 f7a8a040 c0120d70 f19cbf34 f19cbf34 f7a8a040 ffffffff
Call Trace:
[<c0127852>] tasklet_action+0x72/0xd0
[<c011fa08>] io_schedule+0x28/0x40
[<c014007c>] wait_on_page_bit_wq+0xcc/0x100
[<c0120d70>] autoremove_wake_function+0x0/0x50
[<c0120d70>] autoremove_wake_function+0x0/0x50
[<c013fda3>] filemap_fdatawait+0x1e3/0x240
[<c0162819>] sync_blockdev+0x39/0x50
[<c0162b52>] sys_fsync+0xc2/0x100
[<c03106ea>] sysenter_past_esp+0x43/0x65


This is on a system with a DAC960 driver. But we've seen it here
on a system with scsi disk as well.



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