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

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Message-ID: <20130624160012.GB5993@redhat.com>
Date:	Mon, 24 Jun 2013 12:00:12 -0400
From:	Dave Jones <davej@...hat.com>
To:	Steven Rostedt <rostedt@...dmis.org>
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 Mon, Jun 24, 2013 at 10:52:29AM -0400, Steven Rostedt wrote:
 
 > > >  check_list_nodes corruption. next->prev should be prev (ffff88023b8a1a08), but was 00ffff88023b8a1a. (next=ffff880243288001).
 > > 
 > > Can't find "check_list_nodes" in lib/list_debug.c or elsewhere...
 > > 
 > > >   [<ffffffff816e467d>] dump_stack+0x19/0x1b
 > > >   [<ffffffff8104a0c1>] warn_slowpath_common+0x61/0x80
 > > >   [<ffffffff8104a12c>] warn_slowpath_fmt+0x4c/0x50
 > > >   [<ffffffff81112c61>] rb_head_page_deactivate.isra.39+0x61/0x80
 > > 
 > > How? rb_list_head_clear() just modifies list->next directly.
 > > 
 > > > hopefully despite that it'll actually function as intended.
 > > 
 > > Yes ;)
 > 
 > I'm curious to what happened.

Ah, this is the first victim of my new 'check sanity of nodes during list walks' patch.
It's doing the same prev->next next->prev checking as list_add and friends.
I'm looking at getting it into shape for a 3.12 merge after some other preparatory patches
go into 3.11

	Dave

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