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[Bug runtime/14107] Bad user unwinding from kernel fatal signal handler for some x86_64 kernels
- From: "mjw at redhat dot com" <sourceware-bugzilla at sourceware dot org>
- To: systemtap at sourceware dot org
- Date: Mon, 14 May 2012 22:16:13 +0000
- Subject: [Bug runtime/14107] Bad user unwinding from kernel fatal signal handler for some x86_64 kernels
- Auto-submitted: auto-generated
- References: <bug-14107-6586@http.sourceware.org/bugzilla/>
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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