This series simplifies adn tightens the restart logic and solves a
couple of races that annoyed Serge recently:
* c/r: simplify logic of tracking restarting tasks
* c/r: let entire thread group in sys_restart before restoring a thread
* c/r: introduce walk_task_subtree() to iterate through descendants
* c/r: fix restart failure due to a race with ghost/dead tasks
* c/r: defer restore of blocked signals mask during restart
Applies on ckpt-v18, works well on my tests.
Oren.
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