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DragonFly kernel List (threaded) for 2006-01
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Re: kgdb can't unwind double faults

From: Matthew Dillon <dillon@xxxxxxxxxxxxxxxxxxxx>
Date: Mon, 30 Jan 2006 23:09:12 -0800 (PST)

:in the process of trying to get my NForce4 GeForce 6150 IGP running=20
:under X (by porting the FreeBSD driver) I noticed that our gdb can't=20
:unwind over double faults.  In fact it seems like there is code to=20
:unwind over traps, but it isn't used (due to structural changes in=20
:Am I missing something?  Is there a way to see the stack trace=20
:nevertheless?  Is there somebody who wants to port FreeBSD's efforts?=20
:(dunno if we want a seperate kgdb binary, but it seems an easy way)
:   simon

    I have very little experience with gdb but the basic answer is
    *YES*, it is possible.  There is some code in there somewhere for 
    tracking down stack frames and it would not be too difficult
    to detect when the stack frame is sitting on the double-fault
    stack and to have the backtrace chain back to the kernel stack.


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