"Use of uninitialized value $address in exists" and nearly-empty PDF call graph

[GoogleCodeExporter]

What steps will reproduce the problem?
1.Run with CPURPOFILE enabled
2.Run "pprof --pdf <exe> <prof file> > foo.pdf


What is the expected output? What do you see instead?
I expect a PDF file. Instead I get a Perl warning "Use of uninitialized value 
$address in exists at .../pprof line 2827" and the graphviz output is almost 
empty (just two boxes in the call graph).

What version of the product are you using? On what operating system?
2.2.90, Scientific Linux 6.6 x86_64

Please provide any additional information below.
Using pprof from gperftools-2.1 works fine, with no warnings and generating a 
complete call graph. Please let me know what additional information I can 
provide.

Original issue reported on code.google.com by [email protected] on 2 Dec 2014 at 7:09