[Bug nptl/19861] pthread library fork invocation leads to crash

[fweimer at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=19861

--- Comment #2 from Florian Weimer <fweimer at redhat dot com> ---
It turns out the IFUNC handler is not an optimization in the vfork case.  A
tail call is required there because the vfork implementation has to make sure
that it can return twice even if the stack has been clobbered (which is why the
return address is loaded into a register in the i386 and x86_64
implementations).

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