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    Subjectarpd problems

    Hello once again, one and all. I haven't heard anything from my first
    few posts regarding my arpd oopses, but I am hoping that is just a
    result of lag time with vger. I have some more data, this time there
    should be much more ability to trace things.

    The problem: I get an oops (reproduced below, with ksymoops output)
    from arpd when doing random network things.

    The testing done: I didn't start arpd from my rc.inet2 script, as I
    usually do. I recompiled it (arpd 1.02) and enabled debugging. I
    then ran it (as root) in one vc and did network things in another. It
    was stable for a short period of time, and then gave me the oops shown
    below. Luckily, arpd also spat out a bit of information.

    As a final comment, something that may or may not be related to this
    problem, I have started getting these messages in my logs. Here is a
    sample from a recent log:
    Nov 21 16:42:03 puck kernel: Socket destroy delayed (r=0 w=248)
    Nov 21 20:11:54 puck kernel: Socket destroy delayed (r=0 w=312)
    Nov 21 20:50:39 puck kernel: TSW: win < 0 w=0 1=4004971059 2=4004971058
    Nov 21 20:50:40 puck kernel: TSW: win < 0 w=0 1=4004971060 2=4004971059
    Nov 21 20:50:40 puck kernel: TSW: win < 0 w=0 1=4004971061 2=4004971060
    Nov 21 20:50:41 puck kernel: TSW: win < 0 w=0 1=4004971062 2=4004971061
    Nov 21 20:50:42 puck kernel: TSW: win < 0 w=0 1=4004971063 2=4004971062

    I don't know if these are related. I remember some discussion of the
    "Socket destroy delayed" message a few versions back (I think in
    1.3.x), and I know it isn't really an evil thing. The TSW thing, I
    just don't know about.

    Anyway, as before, comments, criticisms, flames, questions and gifts
    are all welcome.

    Nathan Spande

    [debugging info follows]

    The arpd debugging output:
    Type: LOOKUP
    Dst: (8aec2010)
    Dev: c01d16a0 Stamp: 00000002 Updated: 0
    HA: a0:00:00:00:05:00

    Type: REPLY
    Dst: (8aec2010)
    Dev: c01d16a0 Stamp: 00000002 Updated: 0
    HA: a0:00:00:00:05:00

    Segmentation fault

    The oops:
    Unable to handle kernel NULL pointer dereference at virtual address 00000040
    current->tss.cr3 = 0079f000, *pde = 00000000
    Oops: 0000
    CPU: 0
    EIP: 0010:[<c014fe30>]
    EFLAGS: 00010246
    eax: c014fe20 ebx: c000cde0 ecx: 00000000 edx: c000ce00
    esi: 00000008 edi: c000cdfc ebp: 00000008 esp: c07faf74
    ds: 0018 es: 0018 ss: 0018
    Process arpd.debug (pid: 204, process nr:
    28, stackpage=c07fa000)
    Stack: c000cde0 bffffb24 c01622a6 00000008 c000ce00 c04f1ebc c0bd9900 c04f1e88
    ffffffea 0000001c c0124399 c04f1e88 c0bd9900 bffffb08 0000001c c0d6c810
    00000004 08048588 bffffae0 c010a9d8 00000004 bffffb08 0000001c 00000004
    Call Trace: [<c01622a6>] [<c0124399>] [<c010a9d8>]
    Code: 83 7e 38 1c 74 1a 6a 01 56 e8 c2 c0 fe ff b8 ea ff ff ff 83

    The ksymoops output:
    puck:~$ ksymoops / < arpd.oops
    Using `/' to map addresses to symbols.

    >>EIP: c014fe30 <arpd_callback+10/e0>
    Trace: c01622a6 <netlink_write+a6/d0>
    Trace: c0124399 <sys_write+b9/f0>
    Trace: c010a9d8 <system_call+38/40>

    Code: c014fe30 <arpd_callback+10/e0> cmpl $0x1c,0x38(%esi)
    Code: c014fe34 <arpd_callback+14/e0> je c014fe50
    Code: c014fe36 <arpd_callback+16/e0> pushl $0x1
    Code: c014fe38 <arpd_callback+18/e0> pushl %esi
    Code: c014fe39 <arpd_callback+19/e0> call fffec0d0 <_EIP+fffec0d0>
    Code: c014fe3e <arpd_callback+1e/e0> movl $0xffffffea,%eax
    Code: c014fe43 <arpd_callback+23/e0> addl $0xffffff90,(%eax)
    Code: c014fe46 <arpd_callback+26/e0> nop
    Code: c014fe47 <arpd_callback+27/e0> nop

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