igprof/igprof — pull request #50 by ktf (2014-12-02 14:01:58+00:00)
Title: Avoid crash in multithreaded programs.

This is needed because apparently unw_backtrace fills the last entry of
the stack array with a 0 in case we are talking about the stacktrace of
a (non-main) thread, resulting in a subsequent crash in childStackNode.