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atexit_call_exitfuncs() cached its loop bound on entry
(for (idx = aehead->nfuncs - 1; idx >= 0; idx--)), while
atexit_register() appends new entries at funcs[nfuncs] and bumps nfuncs.
Any function registered by an exit handler via atexit() / on_exit() /
__cxa_atexit() lands above the cached bound and is never invoked, even
though the registration returns OK.
This contradicts the exit(3) documentation that NuttX mirrors verbatim
in its own exit() docstring (libs/libc/stdlib/lib_exit.c):
It is possible for one of these functions to use atexit(3) or
on_exit(3) to register an additional function to be executed
during exit processing; the new registration is added to the
front of the list of functions that remain to be called.
The same restructure closes a second defect: atexit_call_exitfuncs()
read and cleared the task-group-shared ta_exit list without holding
ta_lock, while atexit_register() takes it ("The following must be
atomic"). Entries are now claimed under the lock and the handler is
invoked with the lock released, so a handler re-entering
atexit_register() cannot deadlock (also safe with the non-recursive
nxmutex used here).
Evidence: exit(3) man page, DESCRIPTION -
https://man7.org/linux/man-pages/man3/exit.3.html
NuttX mirrors this passage verbatim in its own exit() docstring --
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