From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 428771061B24 for ; Mon, 30 Mar 2026 22:46:36 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 9F54C6B008C; Mon, 30 Mar 2026 18:46:35 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 97FB56B0095; Mon, 30 Mar 2026 18:46:35 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 846C36B0096; Mon, 30 Mar 2026 18:46:35 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0011.hostedemail.com [216.40.44.11]) by kanga.kvack.org (Postfix) with ESMTP id 6FB826B008C for ; Mon, 30 Mar 2026 18:46:35 -0400 (EDT) Received: from smtpin04.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay10.hostedemail.com (Postfix) with ESMTP id ED1EAC2E48 for ; Mon, 30 Mar 2026 22:46:34 +0000 (UTC) X-FDA: 84604215108.04.3EC6F3F Received: from mx0a-001b2d01.pphosted.com (mx0a-001b2d01.pphosted.com [148.163.156.1]) by imf02.hostedemail.com (Postfix) with ESMTP id 86BC98000E for ; Mon, 30 Mar 2026 22:46:32 +0000 (UTC) Authentication-Results: imf02.hostedemail.com; dkim=pass header.d=ibm.com header.s=pp1 header.b=OViIBhHT; spf=pass (imf02.hostedemail.com: domain of gor@linux.ibm.com designates 148.163.156.1 as permitted sender) smtp.mailfrom=gor@linux.ibm.com; dmarc=pass (policy=none) header.from=ibm.com ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1774910792; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=5ZGxwe27utPhf3+oIGgSJ7l7bt2graX57AUsA5Vn4j0=; b=2fUgRrz3pvfnZ94Abfc3Dgn/ynvQigK1VBRl8v5CfLitMJjIzrC6dl6DZe3kHn/sKOEo2w wlHWIzxEIyl3ptj/Ib54Mvwli1GSa75mXQhTYytjrR9mVWEfLsYtbi0RQsnvIGB0x7Felo eI2zlKZzAWNh7qBufNlqveRqi/d3diU= ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1774910792; a=rsa-sha256; cv=none; b=RhSPS3teXuxUzHjiQ2XMW3kUhjEjxdIMV7fq3qMc7VjHjw8UwZMwBqnPVKLjy+ZXWAGqNj MTAGLPwC3Y4nL1o1w5c4L6xRfMRFLuHdjWkamPjRQJJYnzU3BgUO9GmNe8rFutfKRzRfxA /vIGHLGFU5jjVuiJnJa0VpKT59DGHhA= ARC-Authentication-Results: i=1; imf02.hostedemail.com; dkim=pass header.d=ibm.com header.s=pp1 header.b=OViIBhHT; spf=pass (imf02.hostedemail.com: domain of gor@linux.ibm.com designates 148.163.156.1 as permitted sender) smtp.mailfrom=gor@linux.ibm.com; dmarc=pass (policy=none) header.from=ibm.com Received: from pps.filterd (m0353729.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.18.1.11/8.18.1.11) with ESMTP id 62UJp3KR2273702; Mon, 30 Mar 2026 22:46:27 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ibm.com; h=cc :content-type:date:from:in-reply-to:message-id:mime-version :references:subject:to; s=pp1; bh=5ZGxwe27utPhf3+oIGgSJ7l7bt2gra X57AUsA5Vn4j0=; b=OViIBhHTeTgMlOJQ7qKKJV9elSMnXSMyFfuWvwi99IfEWI DUO26iQ6iaHiOACMUUMsAJ4rFE9sfszKdTlv5kbF5uvf/LYjx7cdhFF7vIbMJ4Al mMjxO4S1zQUpj8gbTyt9qa1Ad1uE18LWgOH5WppSDwYgWASamOzpSYBMTr8/LVxZ unWyqJWJUg2F+YVW196+FauHtzU0Y6gbjX078N7D431/PzmgdYuBBoAp8f/a78Ic Equ2JbkR86+SjkNlRvjkd1ZEJ+egmu640oDvvpzSuRFRe4emkHfb2tlIXZugFam6 HlobbQ8ZYUt8RpV63F7TINCsBRfMeNMBSScz3Y2Q== Received: from ppma12.dal12v.mail.ibm.com (dc.9e.1632.ip4.static.sl-reverse.com [50.22.158.220]) by mx0a-001b2d01.pphosted.com (PPS) with ESMTPS id 4d66nnguav-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Mon, 30 Mar 2026 22:46:27 +0000 (GMT) Received: from pps.filterd (ppma12.dal12v.mail.ibm.com [127.0.0.1]) by ppma12.dal12v.mail.ibm.com (8.18.1.2/8.18.1.2) with ESMTP id 62UI5pvU021631; Mon, 30 Mar 2026 22:46:26 GMT Received: from smtprelay05.fra02v.mail.ibm.com ([9.218.2.225]) by ppma12.dal12v.mail.ibm.com (PPS) with ESMTPS id 4d6saseura-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Mon, 30 Mar 2026 22:46:26 +0000 Received: from smtpav03.fra02v.mail.ibm.com (smtpav03.fra02v.mail.ibm.com [10.20.54.102]) by smtprelay05.fra02v.mail.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 62UMkMVX39518616 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 30 Mar 2026 22:46:22 GMT Received: from smtpav03.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id C0B582004B; Mon, 30 Mar 2026 22:46:22 +0000 (GMT) Received: from smtpav03.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id F0AC420040; Mon, 30 Mar 2026 22:46:21 +0000 (GMT) Received: from localhost (unknown [9.111.25.211]) by smtpav03.fra02v.mail.ibm.com (Postfix) with ESMTPS; Mon, 30 Mar 2026 22:46:21 +0000 (GMT) Date: Tue, 31 Mar 2026 00:46:20 +0200 From: Vasily Gorbik To: Johannes Weiner Cc: Mikhail Zaslonko , Andrew Morton , David Hildenbrand , Shakeel Butt , Yosry Ahmed , Zi Yan , "Liam R. Howlett" , Usama Arif , Kiryl Shutsemau , Dave Chinner , Roman Gushchin , linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-s390@vger.kernel.org, Alexander Egorenkov Subject: Re: [PATCH v3 7/7] mm: switch deferred split shrinker to list_lru - [s390] panic in __memcg_list_lru_alloc Message-ID: References: <20260318200352.1039011-1-hannes@cmpxchg.org> <20260318200352.1039011-8-hannes@cmpxchg.org> <4d3f8d79-3593-47df-9de8-f94f7f09a403@linux.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: X-TM-AS-GCONF: 00 X-Proofpoint-GUID: 6ElUKQ1fMxYJidno01eGmkeyMmnHhvd8 X-Authority-Analysis: v=2.4 cv=KslAGGWN c=1 sm=1 tr=0 ts=69cafd43 cx=c_pps a=bLidbwmWQ0KltjZqbj+ezA==:117 a=bLidbwmWQ0KltjZqbj+ezA==:17 a=IkcTkHD0fZMA:10 a=Yq5XynenixoA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=uAbxVGIbfxUO_5tXvNgY:22 a=Pav0MyJ5xd6GPgW7jyoA:9 a=QEXdDO2ut3YA:10 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMzMwMDE5MSBTYWx0ZWRfX9EwLaQFaUtCh SV6mlHktBISOTYCdAdngZxGZ9pQiD64Kc3wDXURtmLnOwyCZ679U9wcXtUbzV2vbIet8OQD5Uo9 6jUCFqO9EEc4bfAOFe8RToM0PetcKrKB3A2wtx+syc7nYrwTZGW/A97JQjc7xsZQnAo7Pjv09o1 3FZ1bWJa6XuTwACd7UOvxlMcKUumrlTzI/wpkaVhGyQPlj9illdgzVmxeGHsEH8w2Rs2D2D5hTZ JFQqGnVLowrCU1WIXRZDkUwxJK5oFgHA5cyBxWY+O9zQs3HyNt9YQrBvXdg+kqkENchlzXr0lym BJbl9J5DZf+96IOOS28Y03gSD6oEmHy1qeiDz3a5aCOiX6PryawCs6MzMSa18f8y8KvwdHk+l0s Dwn/reKrDRmRdy/dXOtLi4DClySDEmS1qZohawuqmo57Pg2hvZXOeRBEFtOL+k5eSJUxIDzWrLi b2sdc6QTWXdSOkm4ETw== X-Proofpoint-ORIG-GUID: 6ElUKQ1fMxYJidno01eGmkeyMmnHhvd8 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.51,FMLib:17.12.100.49 definitions=2026-03-30_01,2026-03-28_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 malwarescore=0 lowpriorityscore=0 priorityscore=1501 suspectscore=0 phishscore=0 adultscore=0 bulkscore=0 impostorscore=0 clxscore=1011 spamscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2603050001 definitions=main-2603300191 X-Rspamd-Server: rspam12 X-Stat-Signature: o6u7kmiwhis4bmxxxn76qzsu8oncyk67 X-Rspamd-Queue-Id: 86BC98000E X-Rspam-User: X-HE-Tag: 1774910792-808695 X-HE-Meta: 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 lZvE02Jw b3Wi6VXgY7BjS+YHXKiLO62wd1nlOGDtvierq8TLcxegKHmRbcti0r0+gUA3RYim8DemjUZocJepa/tgGf9nI+m6wbHdV1NUjDhuyyQSMbYi4g/iGPTmVrYZkI0yQPCm99XzOWGdMP/M34QZUEpbJ7Qes8ScW9JfJnL34cmMDNhc8MQGuXWRKliwVP981gP+7CKDx4BtxGyjSuRxOoIIQIBsjRX6kkli2+Kg5uIiidUD9mibb+b7gPt1DOpCUn4ec42cSo4dOnUzCM4txChET3Yr4CEVztSEXqhACyfWZQGvc1/hb3Fs+YGBU6DxeA/ZiYTqwDf8xAlXV1vyTU3HZxATMviSxisLPmjK1zSolEqEJF5/VBBf9haZQ/Q== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Mon, Mar 30, 2026 at 04:56:56PM -0400, Johannes Weiner wrote: > On Mon, Mar 30, 2026 at 04:41:16PM -0400, Johannes Weiner wrote: > > Hello Mikhail, > > > > On Mon, Mar 30, 2026 at 06:37:01PM +0200, Mikhail Zaslonko wrote: > > > with this series in linux-next (since next-20260324) I see a reproducible panic on s390 in the > > > dump kernel when running NVMe standalone dump (ngdump). > > > This only happens in the 'capture kernel', normal boot of the same kernel works fine. > > Can you verify whether the kdump kernel boots with > cgroup_disable=memory? Yes, that is the only special thing about that dump kernel. Sorry for not including the command line. x86 crashes more or less the same way with cgroup_disable=memory. But while I was doing the repro on x86, you already found the root cause. > Can you try the below on top of that -next checkout? > > diff --git a/mm/list_lru.c b/mm/list_lru.c > index 1ccdd45b1d14..7c7024e33653 100644 > --- a/mm/list_lru.c > +++ b/mm/list_lru.c > @@ -637,7 +637,7 @@ int __list_lru_init(struct list_lru *lru, bool memcg_aware, struct shrinker *shr > else > lru->shrinker_id = -1; > > - if (mem_cgroup_kmem_disabled()) > + if (mem_cgroup_disabled() || mem_cgroup_kmem_disabled()) > memcg_aware = false; > #endif Yes, that fixes it for me on s390 and x86. Thank you!