Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756860Ab3J1PpY (ORCPT ); Mon, 28 Oct 2013 11:45:24 -0400 Received: from mailout08.t-online.de ([194.25.134.20]:35610 "EHLO mailout08.t-online.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756833Ab3J1PpW (ORCPT ); Mon, 28 Oct 2013 11:45:22 -0400 Message-ID: <526E8685.3030200@t-online.de> Date: Mon, 28 Oct 2013 16:45:09 +0100 From: Knut Petersen User-Agent: Mozilla/5.0 (X11; Linux i686; rv:24.0) Gecko/20100101 Thunderbird/24.0 MIME-Version: 1.0 To: Ingo Molnar CC: Linus Torvalds , Thomas Gleixner , Paul McKenney , =?ISO-8859-1?Q?Fr=E9d=E9ric_?= =?ISO-8859-1?Q?Weisbecker?= , Greg KH , linux-kernel Subject: Re: [BUG 3.12.rc4] Oops: unable to handle kernel paging request during shutdown References: <525BD08C.2080101@t-online.de> <20131026114303.GA24067@gmail.com> <526E79A2.9080303@t-online.de> <20131028150114.GA12905@gmail.com> <20131028151637.GA13251@gmail.com> In-Reply-To: <20131028151637.GA13251@gmail.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 8bit X-ID: SUnKLiZXwhh+FxQ+Cu2AVPOPLwGsQ8Ay81sCe9EEF4NrmvauDqUA2csrRN6RMWgwX4 X-TOI-MSGID: 207cfd85-36d1-4358-b1b1-74fb594a0999 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1800 Lines: 57 On 28.10.2013 16:16, Ingo Molnar wrote: > * Ingo Molnar wrote: > >>> I tried that patch, together with all the kobj debug options >>> enabled. With that kernel configuration I was unable to >>> reproduce the problem during 500 typical workload / reboot >>> cycles. Without the debug options I was able to reproduce the >>> last reported panic after 91 cycles. The debug options seem to >>> change timing sufficiently to mask the bug ;-( >> Could you send me the kernel config please? > I got your .config off-list, thanks Knut! > > It has all DEBUG_OBJECT options enabled: > > CONFIG_DEBUG_OBJECTS=y > # CONFIG_DEBUG_OBJECTS_SELFTEST is not set > CONFIG_DEBUG_OBJECTS_FREE=y > CONFIG_DEBUG_OBJECTS_TIMERS=y > CONFIG_DEBUG_OBJECTS_WORK=y > CONFIG_DEBUG_OBJECTS_RCU_HEAD=y > CONFIG_DEBUG_OBJECTS_PERCPU_COUNTER=y > CONFIG_DEBUG_OBJECTS_ENABLE_DEFAULT=1 > > but it also has DEBUG_PAGEALLOC enabled: > > CONFIG_DEBUG_PAGEALLOC=y > > I'd suggest disabling that one - it kind of overlaps debugobjects > and it will definitely be a big slowdown. ACK > I'd also suggest turning off lockdep for now: > > CONFIG_PROVE_LOCKING=y > > because we know it does not trigger any useful warning. This too > should speed up things a bit. Well, for now that?s true. On one machine it emits the old warning about the videobuf_dvb_find_frontend() / dvb_device_open() circular reference, but that?s definitely unrelated. > > Whether this would make the crash reproducable again I don't know > :-/ We?ll see ;-) > Thanks, > > Ingo > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/