153ffb6ba49f ("exec: Move cleanup of posix timers on exec out of de_thread")
021691559245 ("exec: Factor unshare_sighand out of de_thread and call it separately")
d036bda7d0e7 ("sched/core: Convert sighand_struct.count to refcount_t")
06e62a46bbba ("fork: don't copy inconsistent signal handler state to child")