gdbserver-xen / gdb crashing domU

["Jonathan M. McCune" <jonmccune@cmu.edu>]

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Hello,

I'm trying to use gdb and gdbserver-xen to walk through the instructions 
executed when starting up a domU kernel.  We are using the current 
xen-unstable (linux-2.6.12-xenU).  I have followed the instructions in 
tools/debugger/gdb/ and I am able to successfully attach to a running 
domU kernel.  I have compiled the domU kernel with debug options as 
described in tools/debugger/gdb/README.  After attaching to the running 
domU kernel, I observe the following behavior:

Issuing the gdb commands 'step', 'stepi', 'next', and 'nexti' when the 
domU kernel is initially paused all crash the domU kernel silently 
(i.e., the state of said domU goes to 'c' if you issue an `xm list` in 
dom0).  'continue' causes the domU kernel to boot up correctly.

All the breakpoints I've tried setting so far (setting the breakpoints 
before issuing the 'continue' in gdb) cause the domU kernel to panic 
when the function at which the breakpoint is set gets run.  Functions 
I've tried setting breakpoints for include dup_task_struct, queue_work, 
scheduler_tick, and activate_task.

Is it possible to step through the domU kernel code as it is booted in Xen?

Thanks,
-Jon


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