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Tue, 17 May 2022 11:53:23 +0000 (GMT) Received: from osiris (unknown [9.145.73.41]) by b06wcsmtp001.portsmouth.uk.ibm.com (Postfix) with ESMTPS; Tue, 17 May 2022 11:53:23 +0000 (GMT) Date: Tue, 17 May 2022 13:53:22 +0200 From: Heiko Carstens To: Liam Howlett Cc: Sven Schnelle , Guenter Roeck , Andrew Morton , "linux-mm@kvack.org" , "linux-kernel@vger.kernel.org" Subject: Re: [PATCH] mapletree-vs-khugepaged Message-ID: References: <20220428172040.GA3623323@roeck-us.net> <20220513165955.mkg5wvfi4dwpzoer@revolver> Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20220513165955.mkg5wvfi4dwpzoer@revolver> X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: -NdFa35NCeB_6brhUSOoTgn0ddyOZKaX X-Proofpoint-GUID: -NdFa35NCeB_6brhUSOoTgn0ddyOZKaX X-Proofpoint-UnRewURL: 0 URL was un-rewritten MIME-Version: 1.0 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.858,Hydra:6.0.486,FMLib:17.11.64.514 definitions=2022-05-17_02,2022-05-17_02,2022-02-23_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 phishscore=0 priorityscore=1501 impostorscore=0 lowpriorityscore=0 suspectscore=0 mlxscore=0 mlxlogscore=807 malwarescore=0 bulkscore=0 adultscore=0 clxscore=1015 spamscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2202240000 definitions=main-2205170069 X-Rspamd-Server: rspam03 X-Rspamd-Queue-Id: 696DA20089 X-Stat-Signature: inb7443yzfnnmx31x8etu8s38ohzq99k Authentication-Results: imf03.hostedemail.com; dkim=pass header.d=ibm.com header.s=pp1 header.b=Z17EwHjI; dmarc=pass (policy=none) header.from=ibm.com; spf=pass (imf03.hostedemail.com: domain of hca@linux.ibm.com designates 148.163.158.5 as permitted sender) smtp.mailfrom=hca@linux.ibm.com X-Rspam-User: X-HE-Tag: 1652788399-894109 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Fri, May 13, 2022 at 05:00:31PM +0000, Liam Howlett wrote: > * Sven Schnelle [220513 10:46]: > > Heiko Carstens writes: > > > FWIW, same on s390 - linux-next is completely broken. Note: I didn't > > > bisect, but given that the call trace, and even the failing address > > > match, I'm quite confident it is the same reason. > > IS that issue supposed to be fixed? git bisect pointed me to > > > > # bad: [76535d42eb53485775a8c54ea85725812b75543f] Merge branch > > 'mm-everything' of > > git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm > > > > which isn't really helpful. > > > > Anything we could help with debugging this? > > I tested the maple tree on top of the s390 as it was the same crash and > it was okay. I haven't tested the mm-everything branch though. Can you > test mm-unstable? > > I'll continue setting up a sparc VM for testing here and test > mm-everything on that and the s390 So due to reports here I did some sort of "special bisect": with today's linux-next I did a hard reset to commit 562340595cbb ("Merge branch 'for-next/kspp' of git://git.kernel.org/pub/scm/linux/kernel/git/gustavoars/linux.git"), started a bisect on Andrew's tree between mm-stable and mm-unstable, and merged whatever commit was about to be bisected into 562340595cbb. This lead finally to commit f1297d3a2cb7 ("mm/mmap: reorganize munmap to use maple states") as "first bad commit". So given that we are shortly before the merge window and linux-next is completely broken for s390, how do we proceed? Right now I have no idea if there is anything else in linux-next that would break s390 because of this. Even though I'm sure you won't like to hear this, but I'd appreciate if this code could be removed from linux-next again.