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    SubjectRe: PROBLEM: null pointer dereference in cfq dispatch requests (2.6.21-rc2 and 2.6.20)
    > I'm puzzled why this is hitting Dan, but no one else has reported
    > anything. Dan, did 2.6.19 work for you?

    Actually, I believe it is happening to me too. This is on a 4-disk raid5 with
    one failed disk on two 2-port sata_sil pci controller cards.

    The BUG below is from, but I will try 2.6.21-rc4 tonight.
    The disk didn't fail until 2.6.20, so I don't know if 2.6.19 would have worked
    or not.

    BUG: unable to handle kernel NULL pointer dereference at virtual address 0000005c
    printing eip:
    *pde = 00000000
    Oops: 0000 [#1]
    Modules linked in: ipv6 raid456 xor md_mod e1000 usbcore ext3 jbd mbcache
    sata_sil sd_mod sr_mod cdrom generic ide_core ata_piix libata
    CPU: 0
    EIP: 0060:[<c0220a29>] Not tainted VLI
    EFLAGS: 00010086 (2.6.20-ARCH #1)
    EIP is at cfq_dispatch_insert+0x19/0x70
    eax: c2bc1340 ebx: 00000000 ecx: 00000049 edx: 00000000
    esi: c298802c edi: f7c17cc0 ebp: 00e47352 esp: f18addfc
    ds: 007b es: 007b ss: 0068
    Process rsync (pid: 3698, ti=f18ac000 task=dfe97570 task.ti=f18ac000)
    Stack: 00000000 c298ce3c f7c17cc0 00e47352 c0220bd9 00000040 c2b3cd40 c2b3c4a8
    cafa6500 c0294750 00000000 00000000 00000004 d8ed1480 00000000 cafa6500
    c298802c c29f0800 c2b3c000 c298802c c0215690 00000000 c0294750 cafa6500
    Call Trace:
    [<c0220bd9>] cfq_dispatch_requests+0xf9/0x4e0
    [<c0294750>] scsi_done+0x0/0x20
    [<c0215690>] elv_next_request+0x20/0x1d0
    [<c0294750>] scsi_done+0x0/0x20
    [<c0294ab6>] scsi_dispatch_cmd+0x146/0x230
    [<c0299904>] scsi_request_fn+0x194/0x2d0
    [<c0219518>] blk_run_queue+0x58/0x70
    [<c0298460>] scsi_next_command+0x30/0x50
    [<c029866b>] scsi_end_request+0xab/0xe0
    [<c0298776>] scsi_io_completion+0x86/0x370
    [<f882c770>] ata_hsm_qc_complete+0x90/0x110 [libata]
    [<f88127eb>] sd_rw_intr+0x2b/0x200 [sd_mod]
    [<c02945a9>] scsi_finish_command+0x49/0x60
    [<c0219d88>] blk_done_softirq+0x58/0x70
    [<c012bc12>] __do_softirq+0x82/0xf0
    [<c012bcb7>] do_softirq+0x37/0x40
    [<c012bee5>] irq_exit+0x45/0x50
    [<c0105dc5>] do_IRQ+0x45/0x80
    [<c0103c0f>] common_interrupt+0x23/0x28
    Code: ae 40 ee ff e9 25 ff ff ff 0f 0b eb fe 0f 0b eb fe 90 83 ec 10 89 1c 24 89
    d3 89 74 24 04 89 c6 89 7c 24 08 89 6c 24 0c 8b 40 0c <8b> 7a 5c 8b 68 04 89 d0
    e8 7a fe ff ff 8b 43 14 89 da 25 01 80
    EIP: [<c0220a29>] cfq_dispatch_insert+0x19/0x70 SS:ESP 0068:f18addfc
    <0>Kernel panic - not syncing: Fatal exception in interrupt

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