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Fri, 27 Feb 2026 13:11:29 +0000 (GMT) Date: Fri, 27 Feb 2026 14:11:28 +0100 From: Heiko Carstens To: Nathan Chancellor Cc: Mathieu Desnoyers , Andrew Morton , linux-kernel@vger.kernel.org, "Paul E. McKenney" , Steven Rostedt , Masami Hiramatsu , Dennis Zhou , Tejun Heo , Christoph Lameter , Martin Liu , David Rientjes , christian.koenig@amd.com, Shakeel Butt , SeongJae Park , Michal Hocko , Johannes Weiner , Sweet Tea Dorminy , Lorenzo Stoakes , "Liam R . Howlett" , Mike Rapoport , Suren Baghdasaryan , Vlastimil Babka , Christian Brauner , Wei Yang , David Hildenbrand , Miaohe Lin , Al Viro , linux-mm@kvack.org, linux-trace-kernel@vger.kernel.org, Yu Zhao , Roman Gushchin , Mateusz Guzik , Matthew Wilcox , Baolin Wang , Aboorva Devarajan , Vasily Gorbik , linux-s390@vger.kernel.org Subject: Re: [PATCH v17 0/3] Improve proc RSS accuracy Message-ID: <20260227131128.10882B8b-hca@linux.ibm.com> References: <20260217161006.1105611-1-mathieu.desnoyers@efficios.com> <20260226120422.8101Cc2-hca@linux.ibm.com> <59b28cb4-4fff-4888-b562-7b7236e29d27@efficios.com> <73e6fea9-caf2-4404-b511-11646013f8db@efficios.com> <20260227011201.GA1577380@ax162> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260227011201.GA1577380@ax162> X-TM-AS-GCONF: 00 X-Proofpoint-Reinject: loops=2 maxloops=12 X-Authority-Analysis: v=2.4 cv=TNRIilla c=1 sm=1 tr=0 ts=69a19809 cx=c_pps a=5BHTudwdYE3Te8bg5FgnPg==:117 a=5BHTudwdYE3Te8bg5FgnPg==:17 a=kj9zAlcOel0A:10 a=HzLeVaNsDn8A:10 a=VkNPw1HP01LnGYTKEx00:22 a=Mpw57Om8IfrbqaoTuvik:22 a=GgsMoib0sEa3-_RKJdDe:22 a=WbwKx_aOVzRSyFeedoMA:9 a=CjuIK1q_8ugA:10 X-Proofpoint-GUID: engyVFzmJTSGnUMACbHisbjpzir_4QkW X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMjI3MDExNiBTYWx0ZWRfX9eYZTNcw6g2P XnyXHaBQR2w4S6iIaEjeDrN3Tl4S5BS+b1ccOVoqOrlenCRnbcJI+UGA52lDiHrjUnH5IgtJvno d0GTfXcVAxMB/eamnwOZGZFB7lbsEi3zYsqCwtCIYQ+ZDgMsrX/4I4pAouHpsCK5YmueKAuLNcH Aiz5gXF6j5bgA7nUYcWI8UnfAa4vScjmTd5e4HOaO/GL0LociGszGw9NtkE0lk68neAlORVgXKf BpFR7pTI+cPo5bZgVIWD1cQ80vJbpxWQF1jQKVRiBKz6UbY/VqCRzMqgnCaYHKdqEylsBwIVZxO VUAKK+iSCqiklIaXW/E/vASlTdW8tIVGp8Sm+hg1oVqhqBrzzbMBalfblTXv3OUbfikLM2OxZYX IBVMMGaHAImkE/4DMwKPhkA/cITJnZKPWrx7DBFizU7qdDkdyMAST2awCKBLDs7GqhBDL9p2bE6 LQ+dt6dcbyObu2cSLkQ== X-Proofpoint-ORIG-GUID: jr70vzbDxhadr_F2vwxMHo9jZkWB_9Ig X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1121,Hydra:6.1.51,FMLib:17.12.100.49 definitions=2026-02-27_02,2026-02-27_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 malwarescore=0 suspectscore=0 adultscore=0 priorityscore=1501 impostorscore=0 spamscore=0 clxscore=1015 bulkscore=0 lowpriorityscore=0 phishscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2601150000 definitions=main-2602270116 X-Stat-Signature: 3bqj79nbktu75pf7j8pifo7dssp7osri X-Rspam-User: X-Rspamd-Queue-Id: 1BC0440006 X-Rspamd-Server: rspam04 X-HE-Tag: 1772198227-848771 X-HE-Meta: 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 glDWT063 e1ShMyKaR1BUs7QR6o+lpWnBPRf8G1Ah7K/TfFyf407ZDuUx5KG5u4JHRU+ULYGgDZg1N9BuUSZVgarJHu/dadi1CgfJFDTD93oDaSqGap76uVjEQcKO9LiRIFMc/4aCpoMyBPqK5SKCljQ3EDgu4sSc5hDoSu6H/+3wPA5WZTMJcJh5bhQYLFN2tgKonqMHkyQasXXOaEB9k9yzQ43UCLBp+C1+bl9m/sJYPhyf7SEzDzXpmXthZNKx/D4iAP9n94Fl7ZizkQtXvof6xHT70NqCLwGIc62n5HdtC Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Thu, Feb 26, 2026 at 06:12:01PM -0700, Nathan Chancellor wrote: > Hi Mathieu, > > On Thu, Feb 26, 2026 at 02:38:04PM -0500, Mathieu Desnoyers wrote: > > I've successfully booted a defconfig s390x next-20260226 kernel in qemu > > with 1 and 4 CPUs, and within a nested s390x VM on 2 cpus. > > > > I guess I'll really need more info about your specific .config and > > command line args to help further. On s390 cpumask_set_cpu(0, mm_cpumask(&init_mm)); in arch_mm_preinit() writes out-of-bounds into swap_attrs[] overwriting the terminating NULL. This seems to happen because the return value of get_rss_stat_items_size() is larger than PERCPU_COUNTER_TREE_ITEMS_STATIC_SIZE: PERCPU_COUNTER_TREE_ITEMS_STATIC_SIZE: 18688 get_rss_stat_items_size(): 21504 Here I stopped looking further into this. I guess you will figure out immediately what's wrong :)