perf report does not get along with perf record -A

[Martin Rosenberg]

I'm working under the assumption that if I want to collect statistics from multiple runs of a program, I can do this by running
perf record prog; perf record -A prog; perf record -A prog

I've found that running perf record twice results in perf report hanging, and running it more than twice results in perf report first spewing a message about invalid formats, then crashing.
A log of the session, as well as the binary, its input and perf.data can be found at:

http://www.club.cc.cmu.edu/~mjrosenb/ion/perf_crash.tar.gz

Thanks --Marty
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