Re: [Linux-ia64] Unwind can load wrong data from pt_regs

From: David Mosberger <>
Date: 2002-12-10 08:21:07
>>>>> On Mon, 09 Dec 2002 19:35:03 +1100, Keith Owens <> said:

  Keith> This implicitly assumes that when a fr or br register is
  Keith> required from pt_regs, info->sp is pointing to pt_regs.  But
  Keith> info->sp is modified as the code unwinds through each
  Keith> function.  The above code only gives correct results for
  Keith> register lookups from the failing function.  Unwinding and
  Keith> accessing a fr or br register from earlier functions loads
  Keith> incorrect values for those registers.

Yes, this is something that has been fixed already in the user-level
libunwind.  It's not hard to fix, just someone needs to get around to
do it.  I don't think it's a critical issue, since it only happens for
nested traps.  I assume you saw this with kdb?

Received on Mon Dec 09 13:22:40 2002

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