[PATCH 0/4] prepare for ->siglock safe threads traversal

[Oleg Nesterov]

The main problem is that copy_process's error path and
release_task() share __exit_signal() which locks ->sighand
and destroys it, but we need to do __unhash_process() under
->sighand.

This patch series tries to solves this. It also tries to
simplify and cleanup the code a bit.

Oleg.
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