Zach Riggle added the comment:

To further clarify the report:

When the attached proof-of-concept is executed, a RuntimeException is raised, 
which has a comment "Should never happen".

The issue isn't due to SIGCHLD, but rather following a waitpid() call.  The 
code attempts to suss the exit code / reason for waitpid() returning, but does 
not check for WIFSTOPPED in its handler.

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue29335>
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