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

[Cyrill Gorcunov]

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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