[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 #4 from Mark Wielaard <mjw at redhat dot com> 2012-05-15 14:07:27 UTC ---
The problem isn't the CFI for do_page_fault, but that there is no CFI for
page_fault. Nor does there seem to be any CFI for any assembly symbol defined
in entry_64.S. Which explains why unwinding to the kernel/user space barrier
just fails.

No idea yet, why the CFI isn't included in /usr/lib/debug/lib/modules/*/vmlinux
for the RHEL6 kernel, it certainly is there in entry_64.S source code. And it
also is in the fedora version
$ eu-readelf --debug-dump=frames
/usr/lib/debug/lib/modules/3.3.5-2.fc16.x86_64/vmlinux | grep -B2 -A1
page_fault
 [  7ae0] FDE length=68 cie=[  6da8]
   CIE_pointer:              28072
   initial_location:         0xffffffff815f4850 <page_fault>
   address_range:            0x2a

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