remote debugging question

From: Jerry Toung (jtoung_at_arc.nasa.gov)
Date: 09/27/04

  • Next message: John Baldwin: "Re: Dell gx280 and acpi problems" 
    To: Mark Teel <mark@teel.ws>
Date: Mon, 27 Sep 2004 11:07:21 -0700

    Good morning list,
    I CAN connect to the target but the 'bt" command return #0 0x00000000 in ??
    () at the remote.

    So this is what I am doing, hopefully somebody can tell me what I am missing.
    I have 2 laptops same brand and model, both running 6.0current and same kernel
    config.

    laptop A panics because of kld I am writing and I want to debug A with laptop
    B.

    I reboot A and login and enter CTRL-ATL-ESC to get db> prompt, then enter
    'gdb', then enter 's'. At this point I don't get the db> prompt anymore and A
    seems to be in a loop, is that normal?

    on laptop B, the only thing I did is get the copy of kernel.debug.A in
    /usr/obj/usr/src/sys/MYKERNEL
    I 'cd' to that location an run
    kgdb
    file kernel.debug.A
    set remotebaud 1
    set remotebreak 1
    set debug remote 1
    target remote /dev/cuaa0

    it connects, on B screen (not using X) I see

    Warning: Unable to find dynamic linker breakpoint function.
    GDB will be unable to debug shared library initializers
    and track explicitly loaded dynamic code.
    warning: shared library handler failed to enable breakpoint
    Sending packet: $qSymbol ::#5...Ack
    Packet Received:
    Packet qSymbol (symbol-lookup) is NOT supported
    (kgdb)

    when I type 'bt', that's where I get
    #0 0x00000000 in ?? ()

    Please somebody advise since I can't do anything with that. And laptop A is
    still hanging/loop, and no prompt.

    Thanks a lot,
    Jerry
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