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+++ This bug was initially created as a clone of Bug #1422159 +++

POSIX requires that fork is async-signal-safe.  Our current implementation is not.

*** Bug 1302896 has been marked as a duplicate of this bug. ***

We are going to track this bug upstream here:
"Bug 4737 - fork is not async-signal-safe"
https://sourceware.org/bugzilla/show_bug.cgi?id=4737

Significant improvements have been made upstream for the single-threaded case, making it AS-safe.

We are still not AS-safe for multi-threaded. That may be impossible to solve.