From: Chandan Rajendra Subject: Re: [BUG] softlockup observed with 64k block size on ppc64 Date: Tue, 25 Oct 2016 18:49:54 +0530 Message-ID: <17387849.5EiRHCrpou@localhost.localdomain> References: <369354227.RU6GsvOxus@localhost.localdomain> <20161025081319.GC16260@quack2.suse.cz> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7Bit Cc: linux-ext4@vger.kernel.org, tytso@mit.edu To: Jan Kara Return-path: Received: from mx0a-001b2d01.pphosted.com ([148.163.156.1]:59968 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S935062AbcJYNUD (ORCPT ); Tue, 25 Oct 2016 09:20:03 -0400 Received: from pps.filterd (m0098404.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.17/8.16.0.17) with SMTP id u9PDF9dr006344 for ; Tue, 25 Oct 2016 09:20:03 -0400 Received: from e23smtp07.au.ibm.com (e23smtp07.au.ibm.com [202.81.31.140]) by mx0a-001b2d01.pphosted.com with ESMTP id 26a7gcjjsm-1 (version=TLSv1.2 cipher=AES256-SHA bits=256 verify=NOT) for ; Tue, 25 Oct 2016 09:20:02 -0400 Received: from localhost by e23smtp07.au.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Tue, 25 Oct 2016 23:20:00 +1000 Received: from d23relay10.au.ibm.com (d23relay10.au.ibm.com [9.190.26.77]) by d23dlp03.au.ibm.com (Postfix) with ESMTP id 9EA3A3578053 for ; Wed, 26 Oct 2016 00:19:57 +1100 (EST) Received: from d23av01.au.ibm.com (d23av01.au.ibm.com [9.190.234.96]) by d23relay10.au.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id u9PDJvh561210826 for ; Wed, 26 Oct 2016 00:19:57 +1100 Received: from d23av01.au.ibm.com (localhost [127.0.0.1]) by d23av01.au.ibm.com (8.14.4/8.14.4/NCO v10.0 AVout) with ESMTP id u9PDJvZR021925 for ; Wed, 26 Oct 2016 00:19:57 +1100 In-Reply-To: <20161025081319.GC16260@quack2.suse.cz> Sender: linux-ext4-owner@vger.kernel.org List-ID: On Tuesday, October 25, 2016 10:13:19 AM Jan Kara wrote: > Hi! > > On Mon 24-10-16 14:10:02, Chandan Rajendra wrote: > > The following soft lockup occurs when fstests' ext4/303 test is executed with > > 64k block size on a ppc64 machine running linux-4.8 kernel. > > Thanks for report! I had a look into the code and I'm not sure why this > happens. Is this reproducible? Did it happen also with older kernels? Yes, This issue can be recreated every single time the test is executed. The bug is present atleast from linux-v4.0 version. I haven't verified if the bug is present in earlier versions of the kernel. -- chandan