linux-kernel - [RFC PATCH 0/6] signal: sigprocmask fixes

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Date:	Mon, 11 Apr 2011 19:19:57 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Tejun Heo <tj@...nel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Cc:	"Nikita V. Youshchenko" <nyoushchenko@...sta.com>,
	Matt Fleming <matt@...sole-pimps.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-kernel@...r.kernel.org
Subject: [RFC PATCH 0/6] signal: sigprocmask fixes

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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