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    Subject[Bug 479] New: visor module oops

    http://bugme.osdl.org/show_bug.cgi?id=479

    Summary: visor module oops
    Kernel Version: 2.5.65
    Status: NEW
    Severity: normal
    Owner: greg@kroah.com
    Submitter: fabrice@fma.homelinux.com


    Distribution: Mandrake Cooker
    Hardware Environment: Hitachi laptop, Intel USB controller/PIIX4 chipset
    Software Environment: pilot-link/kpilot,nodevfs, nohotplug running
    Problem Description: oops when unloading visor module

    Steps to reproduce:
    Plug in your palm (I use a clie T615C). Press the hotsync button.
    Then modprobe visor module. Press cancel on the palm.
    rmmod visor and it rmmod segfault.
    On the other hand, if I modprobe visor first, then press the button,
    then run kpilot, then it works perfectly.

    dmesg gives:
    Unable to handle kernel NULL pointer dereference at virtual address 00000004
    printing eip:
    c01f577b
    *pde = 00000000
    Oops: 0002
    CPU: 0
    EIP: 0060:[<c01f577b>] Not tainted
    EFLAGS: 00010246
    EIP is at devclass_remove_driver+0x4b/0x90
    eax: d0915c04 ebx: c03605c4 ecx: 00000000 edx: 00000000
    esi: c0360580 edi: d0915bbc ebp: c42d7f14 esp: c42d7f00
    ds: 007b es: 007b ss: 0068
    Process rmmod (pid: 20800, threadinfo=c42d6000 task=c74bd2e0)
    Stack: c030c1ff 00000042 d090fa80 d090fa40 d0915bbc c42d7f30 c01f4fbf d0915bbc
    00000042 d0915bc8 d0915bbc d0915d60 c42d7f48 c01f53fa d0915bbc
    c0358ab8
    c0358ab8 00000880 c42d7f54 d09137ce d0915bbc c42d7fbc c012df1e
    c030c008
    Call Trace:
    [<d090fa80>] usb_serial_bus_type+0x40/0xe0 [usbserial]
    [<d090fa40>] usb_serial_bus_type+0x0/0xe0 [usbserial]
    [<d0915bbc>] handspring_device+0x1c/0xe0 [visor]
    [<c01f4fbf>] bus_remove_driver+0x5f/0xa0
    [<d0915bbc>] handspring_device+0x1c/0xe0 [visor]
    [<d0915bc8>] handspring_device+0x28/0xe0 [visor]
    [<d0915bbc>] handspring_device+0x1c/0xe0 [visor]
    [<d0915d60>] +0x0/0x100 [visor]
    [<c01f53fa>] driver_unregister+0x1a/0x44
    [<d0915bbc>] handspring_device+0x1c/0xe0 [visor]
    [<d09137ce>] +0x1e/0x30 [visor]
    [<d0915bbc>] handspring_device+0x1c/0xe0 [visor]
    [<c012df1e>] sys_delete_module+0x1de/0x240
    [<c0142317>] sys_munmap+0x57/0x80
    [<c010948b>] syscall_call+0x7/0xb

    Code: 89 4a 04 89 11 89 40 04 89 47 48 89 3c 24 e8 42 fe ff ff 89

    I use a vanilla 2.5.65, modules-init-tools 0.9.9.

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