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Date: Mon, 24 Jun 2013 12:00:12 -0400
From: Dave Jones <davej@redhat.com>
To: Steven Rostedt <rostedt@goodmis.org>
Cc: Oleg Nesterov <oleg@redhat.com>,
        "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
        Linux Kernel <linux-kernel@vger.kernel.org>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        "Eric W. Biederman" <ebiederm@xmission.com>,
        Andrey Vagin <avagin@openvz.org>
Subject: Re: frequent softlockups with 3.10rc6.
Message-ID: <20130624160012.GB5993@redhat.com>
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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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