From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756838AbcGZOfx (ORCPT ); Tue, 26 Jul 2016 10:35:53 -0400 Received: from mga14.intel.com ([192.55.52.115]:25376 "EHLO mga14.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753895AbcGZOfv (ORCPT ); Tue, 26 Jul 2016 10:35:51 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.28,425,1464678000"; d="scan'208";a="853803536" Date: Tue, 26 Jul 2016 22:35:45 +0800 From: Fengguang Wu To: "Eric W. Biederman" Cc: kernel test robot , containers@lists.linux-foundation.org, lkp@01.org, LKML Subject: Re: [LKP] More information please. Re: [fs] 54cc07a761: BUG: kernel test crashed Message-ID: <20160726143545.GA23656@wfg-t540p.sh.intel.com> References: <5793dfa5.mvXPj4LJOS0dlz3i%xiaolong.ye@intel.com> <877fc9a6mb.fsf@x220.int.ebiederm.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Disposition: inline In-Reply-To: <877fc9a6mb.fsf@x220.int.ebiederm.org> User-Agent: Mutt/1.6.0 (2016-04-01) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Eric, Sorry for the delay! On Mon, Jul 25, 2016 at 01:57:00PM -0500, Eric W. Biederman wrote: >kernel test robot writes: > >> FYI, we noticed the following commit: >> >> https://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace.git for-testing >> commit 54cc07a761deb38318aca64ddf07fc45157c85e0 ("fs: Call d_automount with the filesystems creds") >> >> in testcase: boot >> >> on test machine: 1 threads qemu-system-x86_64 -enable-kvm -cpu Westmere with 320M memory >> >> caused below changes: >> >> >> +-------------------------+------------+------------+ >> | | 8175435777 | 54cc07a761 | >> +-------------------------+------------+------------+ >> | boot_successes | 102 | 16 | >> | boot_failures | 0 | 3 | >> | BUG:kernel_test_crashed | 0 | 3 | >> | timestamp.last | 0 | 54.951425 | >> +-------------------------+------------+------------+ >> >> >> >> [ 19.206454] VFS: Warning: trinity-c0 using old stat() call. Recompile your binary. >> >> Elapsed time: 70 >> BUG: kernel test crashed > >What application generated the line "BUG: kernel test crashed." >What flavor of crash was this? It's a simple boot test with a quick trinity run. So there will be some randomness in this test. The "BUG: kernel test crashed" means the VM reboots by itself while the trinity test is running. If the error message is "BUG: kernel boot crashed" it'd mean VM abnormally reboots before any test is launched. >Given the last boot test failure that was reported to me was about 10 >commits after the problem commit I unfortunately can't take it at face >value that the appropriate commit has been pinpointed. > >If you could give me enough information to dig into this that would >be great. Otherwise I am going to have to proceed forward on the basis >that this is a testing robot failure, and that the people who maintain >the testing robot don't care enough to look after it. I queued more tests in various KVM instances and find the kernel test crashes can also happen in the parent commit. So it looks like a false report. Sorry for the noise! 81754357770ebd90 aeaa4a79ff6a5ed912b7362f20 ---------------- -------------------------- fail:runs %reproduction fail:runs | | | 5:100 0% 5:100 dmesg.BUG:kernel_test_crashed :100 1% 1:100 dmesg.Mem-Info :100 1% 1:100 dmesg.invoked_oom-killer:gfp_mask=0x Regards, Fengguang