[Bug 44816] Cygwin/MSYS2 `script -e` exit status forwarding randomly returns zero for non zero child process

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=44816

--- Comment #2 from Zebediah Figura  ---
(In reply to Zebediah Figura from comment #1)
> I'm guessing the double-free results from the kernel freeing the thread's
> stack once it's terminated (I'm not sure, and it's hard to be sure just from
> skimming the kernel code, but it seems like the only sane thing to do?)
> since we certainly don't free it ourselves.

Actually, on further testing, it seems the kernel doesn't free anything. So
what gives? How could there possibly be a double free here?