linux-kernel - Re: frequent softlockups with 3.10rc6.

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Message-ID: <1372181572.18733.225.camel@gandalf.local.home>
Date:	Tue, 25 Jun 2013 13:32:52 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Dave Jones <davej@...hat.com>
Cc:	Oleg Nesterov <oleg@...hat.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Andrey Vagin <avagin@...nvz.org>
Subject: Re: frequent softlockups with 3.10rc6.

On Tue, 2013-06-25 at 13:26 -0400, Dave Jones wrote:
>  
>  > What's the above saying?  ffff880243288000->prev == 00ffff88023c6cdd but
>  > it should have been ffff88023c6cdd18? That is: ffff88023c6cdd18->next ==
>  > ffff880243288001?
> 
> It's saying something has done >>8 on a pointer, and stuck it in a list head.
> 

Yes, that's from the "01" in ffff880243288001. The flags held in the
pointer are never used as an address. That's always encapsulated with
rb_list_head(), which clears the flags and returns the actual address.

-- Steve


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