gdb stack frames (was Re: page fault panic tracked down...)

[Peter Edwards]

Ian Dowse wrote:

>Of course this doesn't explain why gdb mostly works on userland
>programs, so it could just be that I didn't try hard enough to find
>the right registers. Certainly as-is, gdb does not know how to
>retrieve all the saved registers from a kernel trap frame itself.
>  
>
Hi Ian,

Whatever about the rest of the trap frame, unwinding through traps has 
been broken for some time due to some FreeBSD specific code not being 
actually compiled into GDB: See PR 60732

>Of course this doesn't explain why gdb mostly works on userland
>programs,
>
Obviously you don't debug mutithreaded programs:-) (There's some old PRs 
lying about for that too...)

--
Peter.