From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755332AbbLQJrZ (ORCPT ); Thu, 17 Dec 2015 04:47:25 -0500 Received: from mout.kundenserver.de ([212.227.126.131]:58758 "EHLO mout.kundenserver.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751434AbbLQJrW (ORCPT ); Thu, 17 Dec 2015 04:47:22 -0500 From: Arnd Bergmann To: Andre Przywara Cc: linux-arm-kernel@lists.infradead.org, Ming Lei , Jens Axboe , Rob Herring , Eric Auger , Linux Kernel Mailing List , linux-block@vger.kernel.org Subject: Re: block layer bug with 4.4-rc3+ Date: Thu, 17 Dec 2015 10:46:49 +0100 Message-ID: <4730511.HtLlToyPh4@wuerfel> User-Agent: KMail/4.11.5 (Linux/3.16.0-10-generic; KDE/4.11.5; x86_64; ; ) In-Reply-To: <56728044.7090906@arm.com> References: <566FF3ED.1000503@arm.com> <1885710.UNGYhDGGcI@wuerfel> <56728044.7090906@arm.com> MIME-Version: 1.0 Content-Transfer-Encoding: 7Bit Content-Type: text/plain; charset="us-ascii" X-Provags-ID: V03:K0:InEUF+/18Bw7zWtnFbgUR0S05hKpO7dxA0IHnbcPIP+RN6Xxcnk 0qLdo1rRmXtnNKw2WExgi5GEego3dkwU2xkzAAlmbDjAPkViocVSgi7tXmbEMHO8iCVrCzU BLNnLU7nRp3RThdGv0fewBCzOoD5IM1/A8gTx+YT120FGLSkkdoDLQ50kUI1RaNPaUsBoyl Yg2nLPRNAk4N8VL1fnomA== X-UI-Out-Filterresults: notjunk:1;V01:K0:t8B2j+N+YoQ=:6yifr38qgGU45hQWa5LyRn qFrpt9K2ButHr4Nz99VCaViyYTHiiUUKS8qXdfXttpA61ID0Fui4CcnXP6xQbbDwOqP0VcaWH NwqCokf/woAWOk08u4jMgWWxAjsOXvn8tD417guDEFgN7CNREGx4FxE4RC1aDkfjpnnAHbREN QXodIQDanx7tLcgDD6A5j5cKYsHu0Iw6LSwlzFcHOoOouAZRtfwdbpkUsDT3n6jQ1Ugso8eU5 L3wyr7w+lRo3SuPryNo0UAsywJ1ySeGZyg1Des+ib4NGfqmxrMJ5rGTv9nvILdgGRXX2uIT1o wWS5MLRwQJOJfNtphM8g2LpAAD+Pe+DFdL1S3D7BXEW2981WLEYcEBAYNXBHtgM10/1eFApiK sWO86/hpVeNitLJXRp2iCLfodqp/Rb8xBmEZAYnQ8kHi2r5LUCfV0RBO6FWeaRp1CItVVr/kj PvaBl/aOOQHE6sLap5l3wa4G/6GUlz4sILnDiaNvN4YD/ILUh7kB6hQW6mF7mfKiXNd6EOpM9 F+RQgQio7+krzF0RtUSsgE1laPy8ZwVszxqGABCDVDYdgBjihvL+rV0rX/vXTCB7K0CT14VCL KxlK80uzbSCo5CbNMBLBFn6ftDO0rZ2Gwd/yYfYhB6PcV/OcsXWiZ8IoB01FjkPhbiEv8HFgE TKmLq4+KnfY4/xvJnuH4rlo+TuCObvDqGLIvzZW1+a5CAagPr12Zfqla3D2FNdJwRswB89FSv LTc3J4madtMlsh1/ Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thursday 17 December 2015 09:28:36 Andre Przywara wrote: > > So it was running for almost a day without LPAE now, but with highmem, > and the bug didn't show up. So for the time being I'd avoid another test > run without highmem, as LPAE alone is sufficient to trigger it. There is clearly no need to try with both LPAE and HIGHMEM disabled, that would almost certainly not bring the bug back. A more useful test might be to try Cubieboard with LPAE enabled, possibly with LPAE and no highmem, to rule out the possibility that the bug just gets less likely when you have less highmem. > Also it seems that CONFIG_HIGHMEM is selected by MULTI_V7, so I can't > configure it out for this box, but would have to restrict memory to > 768M, I guess. > > Next I will try some tracing as Ming suggested. It should not be selected by MULTI_V7, the only 'select HIGHMEM' statement I see is for ARCH_OMAP2PLUS_TYPICAL, and that is not a mandatory option for anything, it just turns on a few things that are generally useful. Arnd