Date: Sun, 14 Dec 2014 19:42:20 -0500
From: Dave Jones <davej@redhat.com>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Chris Mason <clm@fb.com>, Mike Galbraith <umgwanakikbuti@gmail.com>,
        Ingo Molnar <mingo@kernel.org>, Peter Zijlstra <peterz@infradead.org>,
        =?iso-8859-1?Q?D=E2niel?= Fraga <fragabr@gmail.com>,
        Sasha Levin <sasha.levin@oracle.com>,
        "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Suresh Siddha <sbsiddha@gmail.com>, Oleg Nesterov <oleg@redhat.com>,
        Peter Anvin <hpa@linux.intel.com>
Subject: Re: frequent lockups in 3.18rc4
Message-ID: <20141215004220.GA671@redhat.com>
Mail-Followup-To: Dave Jones <davej@redhat.com>,
	Linus Torvalds <torvalds@linux-foundation.org>,
	Chris Mason <clm@fb.com>, Mike Galbraith <umgwanakikbuti@gmail.com>,
	Ingo Molnar <mingo@kernel.org>,
	Peter Zijlstra <peterz@infradead.org>,
	=?iso-8859-1?Q?D=E2niel?= Fraga <fragabr@gmail.com>,
	Sasha Levin <sasha.levin@oracle.com>,
	"Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	Suresh Siddha <sbsiddha@gmail.com>, Oleg Nesterov <oleg@redhat.com>,
	Peter Anvin <hpa@linux.intel.com>
References: <CA+55aFz3iUyV9=_rVUdO0WPoOyOKOYkcHCxb3p=2fgSHtCTNgw@mail.gmail.com>
 <20141211145408.GB16800@redhat.com>
 <CA+55aFy1_w1NrkeopMXsxGftO5F03JzKgn-8uTQRnEAXuoiXgg@mail.gmail.com>
 <20141212185454.GB4716@redhat.com>
 <CA+55aFw7vJkuJ9RtVS3yhPsqDos+ii1kdJBZEeoxhb9c2=rStQ@mail.gmail.com>
 <20141213165915.GA12756@redhat.com>
 <20141213223616.GA22559@redhat.com>
 <CA+55aFwCa1+cBGxt-v487K-QBvxGyB9bL4u34zgMep9uFW+Mgw@mail.gmail.com>
 <20141214234654.GA396@redhat.com>
 <CA+55aFyUtZobUADgtss7e4w-yriMtz7hKVKs=Ed72KQoQ9n2nA@mail.gmail.com>
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On Sun, Dec 14, 2014 at 04:38:00PM -0800, Linus Torvalds wrote:
 > On Sun, Dec 14, 2014 at 3:46 PM, Dave Jones <davej@redhat.com> wrote:
 > > On Sat, Dec 13, 2014 at 02:40:51PM -0800, Linus Torvalds wrote:
 > >  > On Sat, Dec 13, 2014 at 2:36 PM, Dave Jones <davej@redhat.com> wrote:
 > >  > >
 > >  > > Ok, I think we can rule out preemption. I just checked on it, and
 > >  > > found it wedged.
 > >  >
 > >  > Ok, one more. Mind checking what happens without CONFIG_DEBUG_PAGEALLOC?
 > >
 > > Crap. Looks like it wedged. It's stuck that way until I get back to it
 > > on Wednesday.
 > 
 > Hey, this is not "crap" at all. Quite the reverse.

It was more a "Crap it's wedged and I can't do anything about it for days".
I didn't look closely at the actual traces this time.

 > DaveJ, do you have the kernel image for this? I'd love to see what the
 > code is around that "save_xstate_sig+0x81" or around those
 > __clear_user+0x17/0x36 points...
 
Not until I get back on Wednesday and reboot it.

	Dave
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