5.4-dropping to debugger

From: Eirik Øverby (ltning_at_anduin.net)
Date: 08/31/05

  • Next message: Robert Gray: "FreeBSD 6.0-BETA3 panic: vm_fault" 
    To: stable@freebsd.org
Date: Wed, 31 Aug 2005 12:51:00 +0200

    Hi, every once in a while (about once a week lately), one of my
    servers has been known to stop responding. Upon connecting the serial
    console, I find myself at a debugger prompt. This is the output I've
    gotten this time.

    I do think I have a debug kernel on that machine, what can I do to
    get more useful information out?

    PS: I have seen various kinds of instability on most of my 5.4-
    installations, no matter the patchlevel. This box is just one of many.

    Anyone?

    /Eirik

    db>
    db> c
    Fatal trap 12: page fault while in kernel mode
    cpuid = 1; apic id = 01
    fault virtual address = 0x2007010
    fault code = supervisor write, page not present
    instruction pointer = 0x8:0xc0581fe8
    stack pointer = 0x10:0xe3384c40
    frame pointer = 0x10:0xe3384c70
    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 = 29 (irq18: fxp0)
    [thread pid 29 tid 100000 ]
    Stopped at fxp_add_rfabuf+0x68: movw %ax,0xe(%ebx)
    db> trace
    Tracing pid 29 tid 100000 td 0xc22a0000
    fxp_add_rfabuf(c2404000,c2404500,2,a6c54bb2,b51487f8) at
    fxp_add_rfabuf+0x68
    fxp_intr_body(c2404000,c2404000,40,ffffffff,8) at fxp_intr_body+0xf1
    fxp_intr(c2404000,0,0,0,0) at fxp_intr+0x14e
    ithread_loop(c22f6500,e3384d38,0,0,0) at ithread_loop+0x1b8
    fork_exit(c06a9150,c22f6500,e3384d38) at fork_exit+0x80
    fork_trampoline() at fork_trampoline+0x8
    --- trap 0x1, eip = 0, esp = 0xe3384d6c, ebp = 0 ---

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