[Bug runtime/14107] Bad user unwinding from kernel fatal signal handler for some x86_64 kernels

[mjw at redhat dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=14107

--- Comment #2 from Mark Wielaard <mjw at redhat dot com> 2012-05-14 22:16:13 UTC ---
(In reply to comment #1)
> See -DDEBUG_UNWIND=99 output:
> 
> _stp_get_uregs:194: unwind levels: 15, ret: -5, pc=0xffffffff814ef8f5
> _stp_get_uregs:209: failed to recover user reg state
> 
> And the for user space the unwinder has to do with partial register values and
> fails...

According to /proc/kallsyms:

ffffffff814ef8d0 T page_fault
ffffffff814ef900 T machine_check

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