Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756571Ab3FSHgz (ORCPT ); Wed, 19 Jun 2013 03:36:55 -0400 Received: from www.meduna.org ([92.240.244.38]:44467 "EHLO meduna.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755576Ab3FSHgy (ORCPT ); Wed, 19 Jun 2013 03:36:54 -0400 Message-ID: <51C15F87.20100@meduna.org> Date: Wed, 19 Jun 2013 09:36:39 +0200 From: Stanislav Meduna User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:17.0) Gecko/20130509 Thunderbird/17.0.6 MIME-Version: 1.0 To: Linus Torvalds CC: Rik van Riel , "H. Peter Anvin" , Steven Rostedt , "linux-rt-users@vger.kernel.org" , "linux-kernel@vger.kernel.org" , Thomas Gleixner , Ingo Molnar , the arch/x86 maintainers , Hai Huang , Peter Zijlstra Subject: Re: [PATCH] mm: fix up a spurious page fault whenever it happens References: <5195ED8B.7060002@meduna.org> <1369183168.6828.168.camel@gandalf.local.home> <519CBB30.3060200@redhat.com> <20130522134111.33a695c5@cuia.bos.redhat.com> <519D08B0.8050707@meduna.org> <1369246316.6828.176.camel@gandalf.local.home> <519D0CAB.7020800@meduna.org> <519D0FF8.5080200@redhat.com> <519D118B.6010306@zytor.com> <519D11BF.5000604@redhat.com> <519DCE2A.4010801@meduna.org> <519E095A.4000105@redhat.com> <519F24DD.5060700@meduna.org> <519F65DB.2020305@redhat.com> <51BE2F5C.8070408@meduna.org> <51C0B177.2000006@meduna.org> In-Reply-To: X-Enigmail-Version: 1.5.1 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Authenticated-User: stano@meduna.org X-Authenticator: dovecot_plain X-Spam-Score: -6.9 X-Spam-Score-Int: -68 X-Exim-Version: 4.72 (build at 25-Oct-2012 18:35:58) X-Date: 2013-06-19 09:36:45 X-Connected-IP: 95.105.165.4:29573 X-Message-Linecount: 47 X-Body-Linecount: 27 X-Message-Size: 2499 X-Body-Size: 856 X-Received-Count: 1 X-Recipient-Count: 11 X-Local-Recipient-Count: 11 X-Local-Recipient-Defer-Count: 0 X-Local-Recipient-Fail-Count: 0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1101 Lines: 32 On 19.06.2013 07:20, Linus Torvalds wrote: >> No crash in 2 days running with preempt none... > > Is this UP? Yes it is. > There's the fast_tlb race that Peter fixed in commit 29eb77825cc7 > ("arch, mm: Remove tlb_fast_mode()"). I'm not seeing how it would > cause infinite TLB faults, but it definitely causes potentially > incoherent TLB contents. And afaik it only happens with > CONFIG_PREEMPT, and on UP systems. Which sounds like it might match > your setup... Oh, thank you for the pointer, this indeed looks interesting. Unfortunately the patch massively does not apply to 3.4 which I am using and I know too little what all is involved here to backport it. I will test it when (if) it gets to the 3.4(-rt) (or when I find some spare time to play with the newer kernel on that system). Thanks -- Stano -- 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/