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    SubjectPROBLEM: ide-related kernel panic in 2.4.19 and 2.4.20-pre11
    PROBLEM: ide-related kernel panic in 2.4.19 and 2.4.20-pre11

    Trying to read a copy-protected audio CD (I think Cactus Data Shield 200) with
    readcd I get a reproduceable kernel panic in 2.4.19 and 2.4.20-pre11.
    As I can reproduce the bug feel free to ask me any further question, if possible
    cc me. (Otherwise it will take a little longer)
    The information I gathered is below.
    some more files (system.map etc) are on
    http://www.cborntraeger.de/linux/panic.tgz

    cheers

    Christian

    -------------------------------------------------
    I send the panic through ksymoops:
    -------------------------------------------------

    ksymoops 2.4.5 on i686 2.4.20-pre11. Options used
    -V (default)
    -k ksyms (specified)
    -l modules (specified)
    -o /lib/modules/2.4.20-pre11/ (default)
    -m System.map (specified)

    Warning (compare_maps): ksyms_base symbol __io_virt_debug_R__ver___io_virt_debug not found in System.map. Ignoring ksyms_base entry
    Unable to handle Kernel Null pointer dereference at virtual address 00000018
    f08968f8
    CPU 0
    EFLAGS: 00010286
    eax: ee88e1c4 ebx: c0322f24 ecx: ebedcb64 edx: 0000005a
    esi: 00000000 edi: 00000040 ebp: c02a9e74 esp: c02a9e50
    00000000 c01da5dc 000003e8 00000046 00000082 ee88e1c4 00000000 c0322f24
    00000040 c02a9eac c01da999 c0322f24 00000000 00000000 00000000 000001f4
    c02a9ec0 00000000 c0322da4 00000001 c0322f24 c18f218c c0322da4 c02a9ed0
    Call Trace: [<c01da5dc>] [<c01dab78>] [<c01dae54>] [<c01dad60>] [<c0124ba3>]
    [<c012432d>] [<c0120c0f>] [<c0120b26>] [<c0120957>] [<c010a74d>]
    [<c010cc18>] [<c01070c3>] [<c01145e6>] [<c0114530>] [<c0107132>]
    [<c0105000>]
    Code: 8b 56 18 c7 45 ec 00 00 00 00 89 70 04 8b 7e 0c 8b 46 1c c7
    Using defaults from ksymoops -t elf32-i386 -a i386


    >>eax; ee88e1c4 <_end+2e55d100/304e7fbc>
    >>ebx; c0322f24 <ide_hwifs+4c4/20a8>
    >>ecx; ebedcb64 <_end+2bbabaa0/304e7fbc>
    >>ebp; c02a9e74 <init_task_union+1e74/2000>
    >>esp; c02a9e50 <init_task_union+1e50/2000>

    Trace; c01da5dc <ide_wait_stat+bc/120>
    Trace; c01dab78 <ide_do_request+c8/1b0>
    Trace; c01dae54 <ide_timer_expiry+f4/1c0>
    Trace; c01dad60 <ide_timer_expiry+0/1c0>
    Trace; c0124ba3 <run_timer_list+f3/160>
    Trace; c012432d <update_wall_time+d/40>
    Trace; c0120c0f <bh_action+1f/40>
    Trace; c0120b26 <tasklet_hi_action+46/70>
    Trace; c0120957 <do_softirq+97/a0>
    Trace; c010a74d <do_IRQ+bd/f0>
    Trace; c010cc18 <call_do_IRQ+5/d>
    Trace; c01070c3 <default_idle+23/30>
    Trace; c01145e6 <apm_cpu_idle+b6/150>
    Trace; c0114530 <apm_cpu_idle+0/150>
    Trace; c0107132 <cpu_idle+42/60>
    Trace; c0105000 <_stext+0/0>

    Code; 00000000 Before first symbol
    00000000 <_EIP>:
    Code; 00000000 Before first symbol
    0: 8b 56 18 mov 0x18(%esi),%edx
    Code; 00000003 Before first symbol
    3: c7 45 ec 00 00 00 00 movl $0x0,0xffffffec(%ebp)
    Code; 0000000a Before first symbol
    a: 89 70 04 mov %esi,0x4(%eax)
    Code; 0000000d Before first symbol
    d: 8b 7e 0c mov 0xc(%esi),%edi
    Code; 00000010 Before first symbol
    10: 8b 46 1c mov 0x1c(%esi),%eax
    Code; 00000013 Before first symbol
    13: c7 00 00 00 00 00 movl $0x0,(%eax)

    Kernel Panic, Aiee..

    1 warning issued. Results may not be reliable.
    ---------------------------------------------------
    /proc/modules:
    ---------------------------------------------------

    usbmouse 2264 0 (unused)
    keybdev 2080 0 (unused)
    mousedev 4244 1
    hid 19300 0 (unused)
    input 3584 0 [usbmouse keybdev mousedev hid]
    ide-scsi 8816 0
    scsi_mod 56276 1 [ide-scsi]
    ide-cd 30148 0
    cdrom 28608 0 [ide-cd]
    usb-uhci 23020 0 (unused)
    usbcore 60960 1 [usbmouse hid usb-uhci]
    rtc 6940 0 (autoclean)

    -----------------------------------------------
    ver-linux
    -----------------------------------------------
    Linux cubus.mynet 2.4.20-pre11 #3 Sat Oct 19 18:50:52 BST 2002 i686 unknown unknown GNU/Linux

    Gnu C 3.2
    Gnu make 3.79.1
    util-linux 2.11u
    mount 2.11u
    modutils 2.4.19
    e2fsprogs 1.27ea
    reiserfsprogs 3.6.3
    PPP 2.4.1
    Linux C Library 2.2.5
    Dynamic linker (ldd) 2.2.5
    Procps 2.0.7
    Net-tools 1.60
    Console-tools 0.2.3
    Sh-utils 2.0.15
    Modules Loaded usbmouse keybdev mousedev hid input ide-scsi scsi_mod ide-cd cdrom usb-uhci usbcore rtc

    -------------------------------------------------
    /proc/scsi/scsi
    -------------------------------------------------
    Attached devices:
    Host: scsi0 Channel: 00 Id: 00 Lun: 00
    Vendor: SONY Model: CD-RW CRX140E Rev: 1.0p
    Type: CD-ROM ANSI SCSI revision: 02

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