Re: Can't unwind through dispatch_illegal_op_fault

From: David Mosberger <davidm_at_napali.hpl.hp.com>
Date: 2005-03-26 19:38:46
>>>>> On Fri, 25 Mar 2005 18:49:51 -0700, Bob Montgomery <bob.montgomery@hp.com> said:

  Bob> I accidentally discovered that another good way for my buncho
  Bob> crash test module to oops the system is to mov from ar.bspstore
  Bob> without zeroing the mode bits on ar.rsc.  The resulting illegal
  Bob> op doesn't unwind past dispatch_illegal_op_fault.

  Bob> I'm testing on a 2.6.10 based system (with other patches), and
  Bob> get the following oops message, stopping at
  Bob> dispatch_illegal_op_fault.  Is this a quick question for the
  Bob> ivt.S folks, or should I prepare a test module for a stock
  Bob> kernel?

Ah, dispatch_illegal_op_fault() is an oddball since after calling
ia64_illegal_op_fault() it does some other work and returns to
ia64_leave_kernel only at that point.  Because of that, it
needs to have unwind info.  Hopefully all that it needs is
a PT_REGS_UNWIND_INFO(0) after SAVE_REST.

	--david
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Received on Sat Mar 26 03:39:45 2005

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