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    Subject2.5.74 does not boot with TCQ: Unable to handle NULL pointer dereference
    Date
    2.5.72 + bk : kernel boots fine with TCQ, TASKFILE, and TASKFILE_IO enabled
    It froze a bunch of times, but at least it booted.

    2.5.74: kernel refuses to boot (kernel panic).
    Disabling TASKFILE_IO does not help
    Disabling TASKFILE does not help
    Disabling TCQ allows the kernel to boot.

    Here's the oops data (copied by hand)...
    Please CC, I'm not subscribed.

    Unable to handle kernel NULL pointer dereference in virtual address 00000000
    ....
    kernel is not tainted...
    ...
    EIP at 0x0
    Process swapper

    __elv_add_request + 0x36/0x50
    ide_do_drive_cmd+0xc2/0x140
    ide_diag_taskfile+0xac/0xe0
    ide_raw_taskfile+0x27/0x30
    ide_tcq_configure+0x7c/0x110
    ide_enable_queued+0x5e/0x100
    __ide_dma_queued_on+0x94/0xc0
    __ide_dma_on+0x53/0x60
    via82cxxx_ide_dma_check+0xbf/0xe0
    probe_hwif+0x24a/0x480
    probe_hwif_init+0x25/0x80
    ide_setup_pci_device+0x57/0x90
    via_init_one+0x3c/0x50
    ide_scan_pcidev+0x5c/0x70
    ide_scan_pcibus+0x3e/0xe0
    probe_for_hwifs+0x10/0x20
    ide_init_builtin_drivers+0x5/0x10
    ide_init+0x45/0x60
    do_initcalls+0x2c/0xa0
    init_workqueues+0xf/0x60
    init+0x34/0x1d0
    init+0x0/0x1d0
    kernel_thread_helper+0x5/0x10

    Code: Bad EIP value

    <0> Kernel panic: Attempted to kill init.

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