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Violators will be prosecuted; (version=TLSv1/SSLv3 cipher=AES256-GCM-SHA384 bits=256/256) Fri, 20 Mar 2020 04:07:30 -0000 Received: from d06av22.portsmouth.uk.ibm.com (d06av22.portsmouth.uk.ibm.com [9.149.105.58]) by b06cxnps4076.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 02K47TKU55509186 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Fri, 20 Mar 2020 04:07:29 GMT Received: from d06av22.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 963CA4C05C; Fri, 20 Mar 2020 04:07:29 +0000 (GMT) Received: from d06av22.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id B33D04C050; Fri, 20 Mar 2020 04:07:28 +0000 (GMT) Received: from [9.85.72.106] (unknown [9.85.72.106]) by d06av22.portsmouth.uk.ibm.com (Postfix) with ESMTP; Fri, 20 Mar 2020 04:07:28 +0000 (GMT) Subject: Re: Ext4 corruption with VM images as 3 > drop_caches To: Jan Kara Cc: linux-ext4@vger.kernel.org, "Theodore Y. Ts'o" , Ritesh Harjani References: <87pndagw7s.fsf@linux.ibm.com> <20200319163613.GA3339@quack2.suse.cz> From: "Aneesh Kumar K.V" Date: Fri, 20 Mar 2020 09:37:27 +0530 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.5.0 MIME-Version: 1.0 In-Reply-To: <20200319163613.GA3339@quack2.suse.cz> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit X-TM-AS-GCONF: 00 x-cbid: 20032004-0008-0000-0000-00000360629C X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 20032004-0009-0000-0000-00004A81C286 Message-Id: <27f3cc91-fd3c-b806-bbd6-fb10b0a86ea0@linux.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.138,18.0.645 definitions=2020-03-19_10:2020-03-19,2020-03-19 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 suspectscore=0 spamscore=0 phishscore=0 priorityscore=1501 clxscore=1015 impostorscore=0 adultscore=0 malwarescore=0 bulkscore=0 mlxscore=0 mlxlogscore=999 lowpriorityscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2003020000 definitions=main-2003200017 Sender: linux-ext4-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-ext4@vger.kernel.org On 3/19/20 10:06 PM, Jan Kara wrote: > Hi! > > On Wed 18-03-20 09:17:51, Aneesh Kumar K.V wrote: >> With new vm install I am finding corruption with the vm image if I >> follow up the install with echo 3 > /proc/sys/vm/drop_caches >> >> The file system reports below error. >> >> Begin: Running /scripts/local-bottom ... done. >> Begin: Running /scripts/init-bottom ... >> [ 4.916017] EXT4-fs error (device vda2): ext4_lookup:1700: inode #787185: comm sh: iget: checksum invalid >> done. >> [ 5.244312] EXT4-fs error (device vda2): ext4_lookup:1700: inode #917954: comm init: iget: checksum invalid >> [ 5.257246] EXT4-fs error (device vda2): ext4_lookup:1700: inode #917954: comm init: iget: checksum invalid >> /sbin/init: error while loading shared libraries: libc.so.6: cannot open shared object file: Error 74 >> [ 5.271207] Kernel panic - not syncing: Attempted to kill init! exitcode=0x00007f00 >> >> And debugfs reports >> >> debugfs: stat <917954> >> Inode: 917954 Type: bad type Mode: 0000 Flags: 0x0 >> Generation: 0 Version: 0x00000000 >> User: 0 Group: 0 Size: 0 >> File ACL: 0 >> Links: 0 Blockcount: 0 >> Fragment: Address: 0 Number: 0 Size: 0 >> ctime: 0x00000000 -- Wed Dec 31 18:00:00 1969 >> atime: 0x00000000 -- Wed Dec 31 18:00:00 1969 >> mtime: 0x00000000 -- Wed Dec 31 18:00:00 1969 >> Size of extra inode fields: 0 >> Inode checksum: 0x00000000 >> BLOCKS: >> debugfs: >> >> Bisecting this finds >> Commit 244adf6426ee31a83f397b700d964cff12a247d3("ext4: make >> dioread_nolock the default") as bad. If I revert the same on top of linus >> upstream(fb33c6510d5595144d585aa194d377cf74d31911) I don't hit the >> corrupttion anymore. > > Thanks for report and the bisection! Is this guest or host kernel that you > were bisecting? I presume host but I want to make sure. > host kernel. W.r.t guest kernel, it is not dependent on guest kernel version. I was able to recreate with different guest kernel versions (ubuntu 5.3.0-42-generic kernel and also with upstream) -aneesh