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    Subject[OOPS] LVM and (I think) devfs
    Just started playing with LVM, (with devfs), and I've found I can reproduce
    the attached oops consistently doing the following:

    # vgchange -a y
    # vgchange -a n
    # vgchange -a y

    Once this happens, the lvm becomes unreponsive and requires a reboot to
    activate it again.

    It looks like the oops happens in devfs_open().

    I'm using 2.4.17-pre8 with LVM 1.0.1, and the kernel driver from that package.

    Matt
    --
    "Phase plasma rifle in a forty-watt range?"
    "Only what you see on the shelves, buddy"
    ksymoops 2.4.3 on i686 2.4.17-pre8. Options used
    -V (default)
    -k /proc/ksyms (default)
    -l /proc/modules (default)
    -o /lib/modules/2.4.17-pre8/ (default)
    -m /usr/src/linux/System.map (default)

    Warning: You did not tell me where to find symbol information. I will
    assume that the log matches the kernel and modules that are running
    right now and I'll use the default options above for symbol resolution.
    If the current kernel and/or modules do not match the log, you can get
    more accurate output by telling me the kernel version and where to find
    map, modules, ksyms etc. ksymoops -h explains the options.

    Unable to handle kernel NULL pointer dereference at virtual address 00000018
    *pde = 00000000
    Oops: 0002
    CPU: 0
    EIP: 0010:[<c0181226>] Not tainted
    Using defaults from ksymoops -t elf32-i386 -a i386
    EFLAGS: 00010286
    eax: 00000000 ebx: f7e63320 ecx: f79f29a0 edx: c02b1788
    esi: f7b22060 edi: f7e63328 ebp: f79f29a0 esp: f7981f40
    ds: 0018 es: 0018 ss: 0018
    Process vgchange (pid: 137, stackpage=f7981000)
    Stack: f79f29a0 f7b22060 ffffffe9 c200eea0 c02a1f20 c0133159 f7b22060 f79f29a0
    40052500 f79bb000 00000000 bffff91c c013306e f7b24920 c200eea0 00000000
    00000004 f79bb000 bffffa6c f7b24920 c200eea0 bffffa6c bffff91c 00000000
    Call Trace: [<c0133159>] [<c013306e>] [<c01333be>] [<c0106d7b>]
    Code: 89 50 18 eb 2b 90 8d 74 26 00 8b 43 08 85 c0 74 1a 8b 00 85

    >>EIP; c0181226 <devfs_open+76/168> <=====
    Trace; c0133158 <dentry_open+e0/188>
    Trace; c013306e <filp_open+52/5c>
    Trace; c01333be <sys_open+36/cc>
    Trace; c0106d7a <system_call+32/38>
    Code; c0181226 <devfs_open+76/168>
    0000000000000000 <_EIP>:
    Code; c0181226 <devfs_open+76/168> <=====
    0: 89 50 18 mov %edx,0x18(%eax) <=====
    Code; c0181228 <devfs_open+78/168>
    3: eb 2b jmp 30 <_EIP+0x30> c0181256 <devfs_open+a6/168>
    Code; c018122a <devfs_open+7a/168>
    5: 90 nop
    Code; c018122c <devfs_open+7c/168>
    6: 8d 74 26 00 lea 0x0(%esi,1),%esi
    Code; c0181230 <devfs_open+80/168>
    a: 8b 43 08 mov 0x8(%ebx),%eax
    Code; c0181232 <devfs_open+82/168>
    d: 85 c0 test %eax,%eax
    Code; c0181234 <devfs_open+84/168>
    f: 74 1a je 2b <_EIP+0x2b> c0181250 <devfs_open+a0/168>
    Code; c0181236 <devfs_open+86/168>
    11: 8b 00 mov (%eax),%eax
    Code; c0181238 <devfs_open+88/168>
    13: 85 00 test %eax,(%eax)


    1 warning issued. Results may not be reliable.
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