panic/trace swi8: tty:sio clock [Was: Re: Mysterious 60min reboot on net4501]

From: Harald Schmalzbauer (h_at_schmalzbauer.de)
Date: 03/17/04

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    To: freebsd-current@freebsd.org
Date: Wed, 17 Mar 2004 15:08:52 +0100

    Am Dienstag, 16. März 2004 20:24 schrieb Harald Schmalzbauer:
    > Dear all,
    >
    > I have a very strange problem with my soekris net4501 (ElanSC520 embedded
    > board).
    > It ran fine over one year with 4.7 but since I upgraded it to -current from
    > 2 days ago the box reboots every 60 minutes without any message.
    > Does anybody know what this could cause?
    >
    > Attached my kernel and my rc.conf.
    >
    > -Manic Harry ?!?!?

    Dear developers,

    I didn't know that the comBIOS of this device clears the screen after
    rebooting so I couldn't see the panic message on the serial console before.
    Now I have it and a trace. Since this machine has very limited "disk"-space
    (in fact CompactFlash) I compiled a ddb kernel and the db> is now awaiting
    more input.
    The following panic occurs exactly every 60 mins and ~15-20 sec.:

    Fatal trap 12: page fault while in kernel mode
    fault virtual address = 0x8
    fault code = supervisor read, page not present
    instruction pointer = 0x8:0xc0584916
    stack pointer = 0x10:0xc5eb4ccc
    frame pointer = 0x10:0xc5eb4cd8
    code segment = base 0x0, limit 0xfffff, type 0x1b
                            = DPL 0, pres 1, def32 1, gran 1
    processor eflags = interrupt enabled, resume, IOPL = 0
    current process = 27 (swi8: tty:sio clock)
    kernel: type 12 trap, code=0
    Stopped at nd6_slowtimo+0x66: movl 0x8(%eax),%ebx
    db> trace
    nd6_slowtimo(0) at nd6_slowtimo+0x66
    softclock(0) at softclock+0x186
    ithread_loop(c0996580,c5eb4d48,c0996580,c04a63c0,0) at ithread_loop+0x144
    fork_exit(c04a63c0,c0996580,c5eb4d48) at fork_exit+0xb8
    fork_trampoline() at fork_trampoline+0x8
    --- trap 0x1, eip = 0, esp = 0xc5eb4d7c, ebp = 0 ---
    db>

    Let me know if I can give you more info.

    -Harry

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