No idea why these were reimplemented in the first place at all. The loaded guest libc already provides them; Kyty only needs the lower libkernel pthread imports.
Why: Thread-atexit registrations were discarded, leaving objects alive after their guest TLS storage was released.
What: Store registrations per host thread and run them in LIFO order before pthread keys and guest TLS are destroyed.
Why safe: Only callbacks registered on the exiting thread run, once, before existing teardown continues.
nmzik