linux-kernel - Re: + fs-epoll-add-procfs-fdinfo-helper.patch added to -mm tree

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Date:	Tue, 13 Nov 2012 19:53:13 +0400
From:	Cyrill Gorcunov <gorcunov@...nvz.org>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	Pavel Emelyanov <xemul@...allels.com>,
	Al Viro <viro@...IV.linux.org.uk>,
	Alexey Dobriyan <adobriyan@...il.com>,
	James Bottomley <jbottomley@...allels.com>,
	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
	Matthew Helsley <matt.helsley@...il.com>,
	"J. Bruce Fields" <bfields@...ldses.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: + fs-epoll-add-procfs-fdinfo-helper.patch added to -mm tree

On Tue, Nov 13, 2012 at 03:50:50PM +0100, Oleg Nesterov wrote:
> This doesn't look right.
> 
> The problem is, the current locking is broken, ->siglock can not serialize
> ->sigmask changes. Just suppose the the child inherits sigfd from parent
> and they both do sys_signalfd4() at the same time.
> 
> Nothing really bad can happen, that is why nobody bothers to fix this.
> But this patch makes the thing worse, write_seqcount_begin() must be
> serialized correctly.

Thanks a lot, Oleg! I'll update.
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