From mboxrd@z Thu Jan 1 00:00:00 1970 From: Mark Rutland Subject: Re: [PATCH V4 0/6] RCU get_user_pages_fast and __get_user_pages_fast Date: Mon, 2 Mar 2015 14:16:04 +0000 Message-ID: <20150302141604.GB16779@leverpostej> References: <1411740233-28038-1-git-send-email-steve.capper@linaro.org> <54F06636.6080905@redhat.com> <20150227132000.GD9011@leverpostej> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Received: from foss.arm.com ([217.140.101.70]:47208 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753722AbbCBOQe (ORCPT ); Mon, 2 Mar 2015 09:16:34 -0500 Content-Disposition: inline In-Reply-To: <20150227132000.GD9011@leverpostej> Sender: linux-arch-owner@vger.kernel.org List-ID: To: "jcm@redhat.com" Cc: "linux-arch@vger.kernel.org" , "dann.frazier@canonical.com" , Steve Capper , "peterz@infradead.org" , Catalin Marinas , "anders.roxell@linaro.org" , Will Deacon , "linux-mm@kvack.org" , "hughd@google.com" , "christoffer.dall@linaro.org" , "gary.robertson@linaro.org" , "linux@arm.linux.org.uk" , "akpm@linux-foundation.org" , "linux-arm-kernel@lists.infradead.org" , "mgorman@suse.de" > > Head's up: these patches are currently implicated in a rare-to-trigger > > hang that we are seeing on an internal kernel. An extensive effort is > > underway to confirm whether these are the cause. Will followup. > > I'm currently investigating an intermittent memory corruption issue in > v4.0-rc1 I'm able to trigger on Seattle with 4K pages and 48-bit VA, > which may or may not be related. Sometimes it results in a hang (when > the vectors get corrupted and the CPUs get caught in a recursive > exception loop). FWIW my issue appears to be a bug in the old firmware I'm running. Sorry for the noise! Mark. From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pa0-f50.google.com (mail-pa0-f50.google.com [209.85.220.50]) by kanga.kvack.org (Postfix) with ESMTP id D1DA36B0038 for ; Mon, 2 Mar 2015 09:16:35 -0500 (EST) Received: by padfa1 with SMTP id fa1so14519216pad.9 for ; Mon, 02 Mar 2015 06:16:35 -0800 (PST) Received: from foss.arm.com (foss.arm.com. [217.140.101.70]) by mx.google.com with ESMTP id di4si5850352pad.57.2015.03.02.06.16.34 for ; Mon, 02 Mar 2015 06:16:34 -0800 (PST) Date: Mon, 2 Mar 2015 14:16:04 +0000 From: Mark Rutland Subject: Re: [PATCH V4 0/6] RCU get_user_pages_fast and __get_user_pages_fast Message-ID: <20150302141604.GB16779@leverpostej> References: <1411740233-28038-1-git-send-email-steve.capper@linaro.org> <54F06636.6080905@redhat.com> <20150227132000.GD9011@leverpostej> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20150227132000.GD9011@leverpostej> Sender: owner-linux-mm@kvack.org List-ID: To: "jcm@redhat.com" Cc: "linux-arch@vger.kernel.org" , "dann.frazier@canonical.com" , Steve Capper , "peterz@infradead.org" , Catalin Marinas , "anders.roxell@linaro.org" , Will Deacon , "linux-mm@kvack.org" , "hughd@google.com" , "christoffer.dall@linaro.org" , "gary.robertson@linaro.org" , "linux@arm.linux.org.uk" , "akpm@linux-foundation.org" , "linux-arm-kernel@lists.infradead.org" , "mgorman@suse.de" > > Head's up: these patches are currently implicated in a rare-to-trigger > > hang that we are seeing on an internal kernel. An extensive effort is > > underway to confirm whether these are the cause. Will followup. > > I'm currently investigating an intermittent memory corruption issue in > v4.0-rc1 I'm able to trigger on Seattle with 4K pages and 48-bit VA, > which may or may not be related. Sometimes it results in a hang (when > the vectors get corrupted and the CPUs get caught in a recursive > exception loop). FWIW my issue appears to be a bug in the old firmware I'm running. Sorry for the noise! Mark. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org From mboxrd@z Thu Jan 1 00:00:00 1970 From: mark.rutland@arm.com (Mark Rutland) Date: Mon, 2 Mar 2015 14:16:04 +0000 Subject: [PATCH V4 0/6] RCU get_user_pages_fast and __get_user_pages_fast In-Reply-To: <20150227132000.GD9011@leverpostej> References: <1411740233-28038-1-git-send-email-steve.capper@linaro.org> <54F06636.6080905@redhat.com> <20150227132000.GD9011@leverpostej> Message-ID: <20150302141604.GB16779@leverpostej> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org > > Head's up: these patches are currently implicated in a rare-to-trigger > > hang that we are seeing on an internal kernel. An extensive effort is > > underway to confirm whether these are the cause. Will followup. > > I'm currently investigating an intermittent memory corruption issue in > v4.0-rc1 I'm able to trigger on Seattle with 4K pages and 48-bit VA, > which may or may not be related. Sometimes it results in a hang (when > the vectors get corrupted and the CPUs get caught in a recursive > exception loop). FWIW my issue appears to be a bug in the old firmware I'm running. Sorry for the noise! Mark.