[RFC PATCH 0/6] signal: sigprocmask fixes

[Oleg Nesterov]

Hello,

I am not sure this is really wrong and should be fixed. Please comment.

1-2: probably make sense anyway, cleanup + optimization.

4: the main change. From the changelog,

	In short, almost every changing of current->blocked is wrong,
	or at least can lead to the unexpected results.

5-6: If this should be fixed, then we need a lot more trivial changes
     like these ones.

What do you all think?


In theory this can explain the hang reported by Nikita, but this is
not clear.

Oleg.

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