From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755147Ab3KERie (ORCPT ); Tue, 5 Nov 2013 12:38:34 -0500 Received: from avon.wwwdotorg.org ([70.85.31.133]:48988 "EHLO avon.wwwdotorg.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750732Ab3KERic (ORCPT ); Tue, 5 Nov 2013 12:38:32 -0500 Message-ID: <52792D13.70704@wwwdotorg.org> Date: Tue, 05 Nov 2013 10:38:27 -0700 From: Stephen Warren User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.0 MIME-Version: 1.0 To: Tomasz Figa , Tushar Behera CC: linux-next@vger.kernel.org, lkml , Jens Axboe , Chris Mason Subject: Re: Boot failure on Arndale with next-20131105 References: <1451170.jb5zbRXgpt@amdc1227> In-Reply-To: <1451170.jb5zbRXgpt@amdc1227> X-Enigmail-Version: 1.5.2 Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 11/05/2013 09:42 AM, Tomasz Figa wrote: > Hi, > > On Tuesday 05 of November 2013 17:19:00 Tushar Behera wrote: >> Hi, >> >> We are having a boot-time kernel panic on Samsung's Exynos5250-based >> Arndale board with next-20131105. Bisect points to following commit. >> >> <<< >> commit febca1baea1cfe2d7a0271385d89b03d5fb34f94 >> Author: Chris Mason >> Date: Thu Oct 31 13:32:42 2013 -0600 >> >> block: setup bi_vcnt on clones >> >> commit 9fc6286f347d changed the cloning code to make clones cheaper for >> the case where we don't need to clone the iovec array. But, >> the new clone needs the bi_vnct from the original. >> >> Signed-off-by: Chris Mason >> Signed-off-by: Jens Axboe >> >>> >> >> Reverting above commit, Arndale is able to boot again. > > I can confirm exactly the same behavior on Exynos 4210-based Trats board, > with exactly the same bisection results. Despite the backtrace looking different, reverting that commit also solves the boot failures on the Tegra-based "Beaver" board. > Also note that I spotted multiple build failures in block layer during > the bisection. I note that compiling next-20131105 generates quite a few warnings re: uninitialized variables. Reverting the commit doesn't solve those. > block/blk-merge.c: In function ‘blk_bio_map_sg’: > block/blk-merge.c:133:8: warning: ‘bvprv.bv_len’ may be used uninitialized in this function [-Wmaybe-uninitialized] > block/blk-merge.c:233:23: note: ‘bvprv.bv_len’ was declared here > block/blk-merge.c:133:8: warning: ‘bvprv.bv_offset’ may be used uninitialized in this function [-Wmaybe-uninitialized] > block/blk-merge.c:233:23: note: ‘bvprv.bv_offset’ was declared here > block/blk-merge.c:133:8: warning: ‘bvprv.bv_page’ may be used uninitialized in this function [-Wmaybe-uninitialized] > block/blk-merge.c:233:23: note: ‘bvprv.bv_page’ was declared here > block/blk-merge.c: In function ‘blk_rq_map_sg’: > block/blk-merge.c:133:8: warning: ‘bvprv.bv_page’ may be used uninitialized in this function [-Wmaybe-uninitialized] > block/blk-merge.c:171:23: note: ‘bvprv.bv_page’ was declared here > block/blk-merge.c:133:8: warning: ‘bvprv.bv_offset’ may be used uninitialized in this function [-Wmaybe-uninitialized] > block/blk-merge.c:171:23: note: ‘bvprv.bv_offset’ was declared here > block/blk-merge.c:133:8: warning: ‘bvprv.bv_len’ may be used uninitialized in this function [-Wmaybe-uninitialized] > block/blk-merge.c:171:23: note: ‘bvprv.bv_len’ was declared here > block/blk-merge.c: In function ‘attempt_merge’: > block/blk-merge.c:108:7: warning: ‘end_bv.bv_offset’ may be used uninitialized in this function [-Wmaybe-uninitialized] > block/blk-merge.c:89:17: note: ‘end_bv.bv_offset’ was declared here > block/blk-merge.c:108:7: warning: ‘end_bv.bv_page’ may be used uninitialized in this function [-Wmaybe-uninitialized] > block/blk-merge.c:89:17: note: ‘end_bv.bv_page’ was declared here > block/blk-merge.c:108:7: warning: ‘end_bv.bv_len’ may be used uninitialized in this function [-Wmaybe-uninitialized] > block/blk-merge.c:89:17: note: ‘end_bv.bv_len’ was declared here