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    SubjectOOPS in process swapper
    This occurred at bootup in a kernel I built for a floppy image.  The oops
    occurrs after the prompt to insert the RAM disk for the fs is printed (by
    /devices/block/rd.c) after I press ENTER (whether or not I change disks -
    it doesn't try to read the floppy again). No other errors show up in the
    boot process. The oops is repeatable, reproducible on another machine,
    and fatal. Reply to dbrobins@uwaterloo.ca for more info.

    ksymoops output (hand-copied the info from the screen, and no ksyms,
    just the vmlinux used):

    ksymoops 0.7c on i686 2.3.39. Options used
    -v vmlinux (specified)
    -k - (specified)
    -l /proc/modules (default)
    -o /lib/modules/2.3.39/ (default)
    -m /usr/src/linux/System.map (default)

    No modules in ksyms, skipping objects
    No ksyms, skipping lsmod
    Unable to handle kernel NULL pointer dereference at virtual address 00000030
    c012fe1c
    *pde = 00000000
    Oops: 0000
    CPU: 0
    EIP: 0010:[<c012fe1c>]
    Using defaults from ksymoops -t elf32-i386 -a i386
    EFLAGS: 00010282
    eax: c10d7cd8 ebx: 00000000 ecx: c10d7e6c edx: 0000001c
    esi: 00000030 edi: 00000018 ebp: ffffffed esp: c10d7b2c
    ds: 0018 es: 0018 ss: 0018
    Process swapper (pid: 1, stackpage=c10d7000)
    Stack: c10d7b9c c10d7e6c 00000030 c023e060 c10d7e6c c10d7cd8 00000002 00000000
    00000003 000001e1 c10d7b9c 00000000 c023df93 00000000 00000000 c10d7e6c
    c10d7cd8 c10d7c7c 00001034 ffffffff c10d7cd8 00000001 00000000 00000005
    Call Trace: [<c0105000>] [<c010716f>] [<c010756f>]
    Code: 8b 47 18 39 f0 74 2d 56 50 68 e0 2d 1e c0 e8 d9 3c fe ff 83

    >>EIP; c012fe1c <blkdev_open+20/e8> <=====
    Trace; c0105000 <empty_bad_page+0/1000>
    Trace; c010716f <init+7/158>
    Trace; c010756f <kernel_thread+23/30>
    Code; c012fe1c <blkdev_open+20/e8>
    00000000 <_EIP>:
    Code; c012fe1c <blkdev_open+20/e8> <=====
    0: 8b 47 18 movl 0x18(%edi),%eax <=====
    Code; c012fe1f <blkdev_open+23/e8>
    3: 39 f0 cmpl %esi,%eax
    Code; c012fe21 <blkdev_open+25/e8>
    5: 74 2d je 34 <_EIP+0x34> c012fe50
    <blkdev_open+54/e8>
    Code; c012fe23 <blkdev_open+27/e8>
    7: 56 pushl %esi
    Code; c012fe24 <blkdev_open+28/e8>
    8: 50 pushl %eax
    Code; c012fe25 <blkdev_open+29/e8>
    9: 68 e0 2d 1e c0 pushl $0xc01e2de0
    Code; c012fe2a <blkdev_open+2e/e8>
    e: e8 d9 3c fe ff call fffe3cec <_EIP+0xfffe3cec>
    c0113b08 <printk+0/174>
    Code; c012fe2f <blkdev_open+33/e8>
    13: 83 00 00 addl $0x0,(%eax)


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