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    Subjectoops in snmp6_unregister_dev()
    Hi all,

    I'm getting an oops in snmp6_unregister_dev(). I've replicated the
    problem with these kernels:

    Pre-built 2.6.9-1.6_FC2 (Fedora Core 2)
    Pre-built 2.6.9-1.11_FC2 (Fedora Core 2)
    Custom-built 2.6.10 (

    The oops message below is from 2.6.9-1.11_FC2.

    The trigger is these commands in rapid succession:

    service dhcpd stop
    ifdown eth2
    ifconfig eth2

    The ifconfig command is not required to trigger the oops but it
    dramatically increases the odds of it happening to better than
    90%. Without the ifconfig command the odds of getting the oops
    are much lower, less than 10%.

    The service and ifdown scripts, and the ifconfig utility
    are those included with FC2.

    Interface eth2 is associated with the r8169 device driver. The
    DHCP server is configured to dish out leases on this interface.

    The user-space workaround is to insert delays between the commands
    as follows:

    service dhcpd stop
    sleep 1
    ifdown eth2
    sleep 1
    ifconfig eth2

    The oops message text below was hand typed so their could be some


    Unable to handle kernel NULL pointer dereference at virtual address
    printing eip:
    *pde = 1faf3067
    Oops: 0000 [#1]
    Modules linked in: r8169 microcode dm_mod uhci_hcd ehci_hdc e100 mii
    appletalk ipx md5 ipv6 ext3 jbd
    CPU: 0
    EIP: 0060:[<c019f200>] Not tainted VLI
    EFLAGS: 00010286 (2.6.9-1.11_FC2)
    EIP is at remove_proc_entry+0x2f/0xe3
    eax: 00000000 ebx: 0000000a ecx: ffffffff edx: de100200
    esi: ddce6000 edi: 0000000a ebp: c03d9fd0 esp: c03d9f80
    ds: 007b es: 007b ss: 0068
    Process swapper (pid: 0, threadinfo=c03d9000 task=c034cb80)
    Stack: de100200 0000000a dfd24800 ddce6000 00000000 c03d9fd0 e09691d7
    e094b025 dd9e6e80 dddf2680 c02a63e1 dddf2680 c0421ce0 c03529e0
    00000000 c02a5fc4 c0128666 c03d9fd0 c03d9fd0 c03d9fd0 00000000
    Call Trace:
    [<e09691d7>] snmp6_unregister_dev+0x2f/0x3e [ipv6]
    [<e094b025>] in6_dev_finish_destroy+0x70/0x7f [ipv6]
    [<c02a63e1>] dst_destroy+0x60/0xa7
    [<c02a606f>] dst_run_gc+0xab/0x18a
    [<c02a5fc4>] dst_run_gc+0x0/0x18a
    [<c0128666>] run_timer_softirq+0x1e3/0x2e1
    [<c0124b41>] __do_softirq+0x35/0x79
    [<c01093e7>] do_softirq+0x3a/0x41
    [<c0108993>] do_IRQ+0x239/0x242
    [<c0106468>] common_interrupt+0x18/0x20
    [<c0116418>] apm_bios_call_simple+0x5e/0x95
    [<c02f0000>] __xfrm_state_delete+0xe8/0x160
    [<c0116523>] apm_do_idle+0x12/0x5c
    [<c0116637>] apm_cpu_idle+0xab/0x121
    [<c010408c>] cpu_idle+0x1f/0x34
    [<c03af6bc>] start_kernel+0x20f/0x211
    Code: 56 53 55 55 89 14 24 89 44 24 04 75 13 8d 4c 24 04 89 e2 e8 42 f4
    ff ff 85 c0 0f 85 b7 00 00 00 8b 5c 24 04 31 c0 83 c9 ff 89 df <f2> ae
    f7 d1 49 8b 04 24 89 cd 8d 70 34 83 78 34 00 0f 84 95 00
    <0>Kernel panic - not syncing: Fatal exception in interrupt

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