While working on bug
724802<http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=724802>,
I got a crashdump (attached) which segfaults crash when trying to get a
backtrace with "bt". The dump is pretty obviously corrupted in many ways
(because that kernel bug involves severe memory corruption), but I don't
expect crash to segfault because of it. To reproduce this problem, do
`crash dump-that-segfaults /usr/lib/debug/boot/vmlinux-3.2.0-4-rt-amd64
(where dump-that-segfaults is the attached file and
/usr/lib/debug/boot/vmlinux-3.2.0-4-rt-amd64 is from the
"linux-image-3.2.0-4-rt-amd64-dbg" package version "3.2.46-1+deb7u1") and
then type "bt" in.

Interestingly, when I do "backtrace" it gives a reasonable error and then a
"bt" prints out an error ("<segmentation violation>") instead of actually
crashing, which I think is reasonable behavior.