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    Subject2.4.17 Oops when trying to mount ATAPI CDROM
    Motherboard: ASUS P55T2P4 motherboard (Intel 430HX chipset)
    CPU: AMD K6-III 400MHz
    CD-ROM: No-name ATAPI CD-ROM installed as master on IDE channel 1 (hard
    drive is attached as master on IDE channel 0)
    Kernel: Official 2.4.17 and Red Hat 2.4.9-21

    Whenever I try to access the CD-ROM after boot, I get the following Oops:

    Unable to handle kernel NULL pointer dereference at virtual address
    *pde = 00000000
    Oops: 0000
    CPU: 0
    EIP: 0010:[<c0193030>] Not tainted
    Using defaults from ksymoops -t elf32-i386 -a i386
    EFLAGS: 00010246
    eax: c02b7730 ebx: 00000000 ecx: 00000005 edx: 00000004
    esi: 00000005 edi: c02b7730 ebp: 00000001 esp: c0f51ee0
    ds: 0018 es: 0018 ss: 0018
    Process modprobe (pid: 1180, stackpage=c0f51000)
    Stack: c02b7730 00000286 c8db3960 c0189762 c02b7730 c02b7730 00000007
    c3e03e00 c02b7730 00000134 c8db0a81 c02b7730 c8db3960 00000001
    00000001 00000015 00000001 c01165d7 c8db38a0 c0ab0000 000067a0
    Call Trace: [<c8db3960>] [<c0189762>] [<c8db0a81>] [<c8db3960>]
    [<c8db38a0>] [<c8dad060>] [<c0106f13>]
    Code: 8a 15 63 00 00 00 83 e2 08 75 06 f6 43 6a 02 74 0c be 07 00

    >> EIP; c0193030 <config_drive_xfer_rate+d0/110> <=====
    Trace; c8db3960 <[ide-cd]ide_cdrom_driver+0/f>
    Trace; c0189762 <ide_register_subdriver+92/100>
    Trace; c8db0a81 <[ide-cd]init_module+a1/1af>
    Trace; c8db3960 <[ide-cd]ide_cdrom_driver+0/f>
    Trace; c01165d7 <sys_init_module+537/5f0>
    Trace; c8db38a0 <[ide-cd].LC156+0/d>
    Trace; c8dad060 <[ide-cd]__module_license+0/0>
    Trace; c0106f13 <system_call+33/40>
    Code; c0193030 <config_drive_xfer_rate+d0/110>
    00000000 <_EIP>:
    Code; c0193030 <config_drive_xfer_rate+d0/110> <=====
    0: 8a 15 63 00 00 00 mov 0x63,%dl <=====
    Code; c0193036 <config_drive_xfer_rate+d6/110>
    6: 83 e2 08 and $0x8,%edx
    Code; c0193039 <config_drive_xfer_rate+d9/110>
    9: 75 06 jne 11 <_EIP+0x11> c0193041
    Code; c019303b <config_drive_xfer_rate+db/110>
    b: f6 43 6a 02 testb $0x2,0x6a(%ebx)
    Code; c019303f <config_drive_xfer_rate+df/110>
    f: 74 0c je 1d <_EIP+0x1d> c019304d
    Code; c0193041 <config_drive_xfer_rate+e1/110>
    11: be 07 00 00 00 mov $0x7,%esi

    After the Oops, lsmod shows:

    ide-cd 27072 3 (initializing)

    and the module is stuck at initializing.
    This CD-ROM worked fine on 2.2.20 as long as I booted with "hdc=noprobe
    hdc=cdrom" (otherwise I'd get "lost interrupt" messages). I have tried
    "ide=nodma" with no effect, as well as trying with the "hdc=" options both
    on and off. Running "hdparm -d0 /dev/hdc" before trying the mount causes
    the same Oops.

    Any ideas?

    Manuel A. McLure KE6TAW | ...for in Ulthar, according to an ancient
    <> | and significant law, no man may kill a cat.
    <> | -- H.P. Lovecraft
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