From nobody Mon Jun 15 00:04:00 2026 Received: from OSPPR02CU001.outbound.protection.outlook.com (mail-norwayeastazon11013036.outbound.protection.outlook.com [40.107.159.36]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 2C4EB3D6CB5; Mon, 13 Apr 2026 14:19:04 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=fail smtp.client-ip=40.107.159.36 ARC-Seal: i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776089946; cv=fail; b=g+qb1eFS9aGTw42qDegOYgGl5x1Fd2LklZeMaUa3gE8+VzoyUDq9MlR7fv2geoXzKj9vjHOFzHj5SCZdZji0DSdlmWNClZNhOtE/DPWFG8sKspSONaSb5UZ9AjsAlIncpb/sf57NbTVfD5zfuxTIlNlvMZhuTtPW/nDcgHlGCOM= ARC-Message-Signature: i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776089946; c=relaxed/simple; bh=PycDfAQnAl9Q2MwjGW/kJ0wFBW5g7jqrg2Ts+u13Sa0=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version:Content-Type; b=mcW2k9CVDKzbk1TmO224Io8A5e9GBXmJ0SdkxgCjr5zYx9TmCzuCjbRYVIXNqqoe33jspLrOxW8L/OQU+LnO4GWdkayqMhRwsLQaPPoLSOfDIk0E+FXXy5Hsd50woQLXbpl9s4gKWdjFL+rbpxLX0f7HC1t4herZ2MtuYDqZh1o= ARC-Authentication-Results: i=2; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=nokia.com; spf=fail smtp.mailfrom=nokia.com; dkim=pass (2048-bit key) header.d=nokia.com header.i=@nokia.com header.b=SOZk0cNV; arc=fail smtp.client-ip=40.107.159.36 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=nokia.com Authentication-Results: smtp.subspace.kernel.org; spf=fail smtp.mailfrom=nokia.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=nokia.com header.i=@nokia.com header.b="SOZk0cNV" ARC-Seal: i=1; a=rsa-sha256; s=arcselector10001; d=microsoft.com; cv=none; b=gQYOegEctGUc9AZ0FSNHZp2mcYiKaP3ChCsXSV9U9Jy/AGv3MpPjMx0wMYsNPzSyP8evF3puiial/h12jVDOZUjITkOrpGlFb+2uz6IP9kLoOxR+Weu8NqzSBORkABT19JWHf3zeaetA8HyuPMUqKs3TcuDcLsKpxJjQbpbfICbEnC4ZGUZRXdUg8CRq56mJM4Z6uY67t5wWO+aEjqe1DvUbaJhBc6a8jfjy73ryLT6MhTxLGw7220Gc/fNuNpaY96Vlj3eqcj1K1qlOTLmU/h3bQyl9S4FPykjCZS5RFo7rqQ83j67WpHAbOlduCRp1u4dyYwsI4/yu8FqeuJ5CcA== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector10001; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-AntiSpam-MessageData-ChunkCount:X-MS-Exchange-AntiSpam-MessageData-0:X-MS-Exchange-AntiSpam-MessageData-1; bh=3OKsASrj3OIg4ltBGLusST/gnFcmHWaP4j82YPJgMBg=; b=i3hOYWoixGVGgAwqyonc7xP5C5vFBAiem1Zr4sPUgb140EHsU8rQFkuV0U6rXJivzjEf5j4XIEW0IhoMcLiRjObKxsut7DHYpv43zQXk12qNAJe2gviDEuGIkChiGzhAAPD3gTfcY00fqMZhlZRwKA/Qi0IPpl30p3zPymsMl2h77ndcl3GPD0KdbH+EyaDq+tR8FtXPIbJ7cyCqmNHeCiA9abuN6I9nYa+vl76kEFB+rDNMZn9Bp/EK7SVTg05jslwH9HbzCl48XGBD7xL4Jwgpje03ZN53OYJWCfHuni8nc9nw4v9VxDwHCixVAute7DBw+bZtRJ/PU98m8SZgmw== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass (sender ip is 131.228.2.85) smtp.rcpttodomain=alpha.franken.de smtp.mailfrom=nokia.com; dmarc=pass (p=reject sp=reject pct=100) action=none header.from=nokia.com; dkim=none (message not signed); arc=none (0) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=nokia.com; s=selector1; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=3OKsASrj3OIg4ltBGLusST/gnFcmHWaP4j82YPJgMBg=; b=SOZk0cNVkZRF3C4mhtW17FW6UD0rghKcW2UJjyGDi2w7YpRAx/hqDREJJ3BujymUXMawnIehrp7CkwbActNKT2kWWfkSrcAdPb53Rz4Av/xDCU2wfOq/UEvxvGrIgiWBnxyYHQL4kuRSbCV5j/mzn1SvyLn0YIPq4iMS3bM6xRwweiy3k0n1eqHnZn7Bt4208YfTE2t+i6Sb1I711/5kIaDvehsIsQ/CVOceJMpp+cIpaRnPMz656KqB8mAIgTnZ9FSNYfgiahkVRSMcL2SfCCxR3NDCI4XWGQQBBnYePxakR2GaTUyS1r2288xcsvp9kSForB42IhljEIPe+7yAdA== Received: from DUZPR01CA0161.eurprd01.prod.exchangelabs.com (2603:10a6:10:4bd::18) by DU0PR07MB10757.eurprd07.prod.outlook.com (2603:10a6:10:5a3::14) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.9769.48; Mon, 13 Apr 2026 14:19:01 +0000 Received: from DB5PEPF00014B93.eurprd02.prod.outlook.com (2603:10a6:10:4bd:cafe::2) by DUZPR01CA0161.outlook.office365.com (2603:10a6:10:4bd::18) with Microsoft SMTP Server (version=TLS1_3, cipher=TLS_AES_256_GCM_SHA384) id 15.20.9769.48 via Frontend Transport; Mon, 13 Apr 2026 14:19:01 +0000 X-MS-Exchange-Authentication-Results: spf=pass (sender IP is 131.228.2.85) smtp.mailfrom=nokia.com; dkim=none (message not signed) header.d=none;dmarc=pass action=none header.from=nokia.com; Received-SPF: Pass (protection.outlook.com: domain of nokia.com designates 131.228.2.85 as permitted sender) receiver=protection.outlook.com; client-ip=131.228.2.85; helo=fihe02smtplvp01.emea.nsn-net.net; pr=C Received: from fihe02smtplvp01.emea.nsn-net.net (131.228.2.85) by DB5PEPF00014B93.mail.protection.outlook.com (10.167.8.231) with Microsoft SMTP Server (version=TLS1_3, cipher=TLS_AES_256_GCM_SHA384) id 15.20.9769.17 via Frontend Transport; Mon, 13 Apr 2026 14:19:01 +0000 Received: from uleclfsdev02.linsee.dyn.nesc.nokia.net.net (uleclfsdev02.linsee.dyn.nesc.nokia.net [10.47.240.2]) by fihe02smtplvp01.emea.nsn-net.net (Postfix) with ESMTP id 62684800008E; Mon, 13 Apr 2026 17:19:00 +0300 (EEST) From: Stefan Wiehler To: "Thomas Bogendoerfer" , "Maciej W. Rozycki" , "Jiaxun Yang" , Huacai Chen Cc: linux-mips@vger.kernel.org, linux-kernel@vger.kernel.org, stable@vger.kernel.org, Stefan Wiehler Subject: [PATCH v3] mips: mm: Call rcutree_report_cpu_starting() even earlier Date: Mon, 13 Apr 2026 16:17:00 +0200 Message-ID: <20260413141659.2593550-2-stefan.wiehler@nokia.com> X-Mailer: git-send-email 2.42.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DB5PEPF00014B93:EE_|DU0PR07MB10757:EE_ X-MS-Office365-Filtering-Correlation-Id: 3ad84e73-0b08-4c73-740a-08de99679c07 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|376014|36860700016|82310400026|13003099007|18002099003|56012099003; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:131.228.2.85;CTRY:FI;LANG:en;SCL:1;SRV:;IPV:CAL;SFV:NSPM;H:fihe02smtplvp01.emea.nsn-net.net;PTR:InfoDomainNonexistent;CAT:NONE;SFS:(13230040)(1800799024)(376014)(36860700016)(82310400026)(13003099007)(18002099003)(56012099003);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: uv96utp4hIsgGfr3rTrBIjuiYdNfmDxqqlytIGOmBPKBCvHeFft6q7PazX4MmjmQfKe6ylhVpcGc01eDWhPCbVSZOSNeWnh+gWH25bxmyJFuxs+UBXTb9bcNQsCEJBNmQAm49YB74bmwt9RWdcufM6zcQMJL+jmD5dAvk6FIt91F0+rjg2eOFo0LSLhpgiUhYJ1HlenLT3e1r9UileseykCl65TlbfpgvOYSXFxcmucAL8nOXBgpWT/RjMvvf1aNvB4A35l9+BHFymUg/ImaGcshKO0e59OLlg92tMUhGMkWz6qhGLpftPouJq3YWTUC5jNL8DPPPrs5bHweoHK+4jSylZWxAx55Wf6gpl90/AZBYm9TOHATY5NPmeSW/9nijo5Ezdj8lLu80bzLYNTCtGyHAAU8+gW8kAujpz7pxBdgcslQYHhtlBK9rFzKnKn3 X-OriginatorOrg: nokia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 13 Apr 2026 14:19:01.0538 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 3ad84e73-0b08-4c73-740a-08de99679c07 X-MS-Exchange-CrossTenant-Id: 5d471751-9675-428d-917b-70f44f9630b0 X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=5d471751-9675-428d-917b-70f44f9630b0;Ip=[131.228.2.85];Helo=[fihe02smtplvp01.emea.nsn-net.net] X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: TreatMessagesAsInternal-DB5PEPF00014B93.eurprd02.prod.outlook.com X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DU0PR07MB10757 Content-Type: text/plain; charset="utf-8" rcutree_report_cpu_starting() must be called on secondary CPUs before allocating memory to avoid the following Lockdep-RCU splat when CONFIG_PROVE_RCU_LIST=3Dy: WARNING: suspicious RCU usage 6.6.119-00d46e15c416-fct #1 Not tainted ----------------------------- /kernel/locking/lockdep.c:3762 RCU-list traversed in non-reader section!! other info that might help us debug this: RCU used illegally from offline CPU! rcu_scheduler_active =3D 1, debug_locks =3D 1 no locks held by swapper/1/0. stack backtrace: CPU: 1 PID: 0 Comm: swapper/1 Not tainted 6.6.119-00d46e15c416-fct #1 Stack : 80000000029e37d8 0000000000000000 0000000000000008 80000000029e37= e8 80000000029e37e8 80000000029e3978 0000000000000000 00000000000000= 00 0000000000000000 0000000000000001 ffffffff80d9df38 ffffffff810e19= c0 0000000000000000 0000000000000010 ffffffff80a7d140 00000000000000= 00 ffffffff81c20814 0000000000000000 ffffffff80da0000 00000000000000= 00 ffffffff80cadf38 0000000000000000 0000000000000000 80000000029ab6= 80 72f093276415c1f3 ffffffff81c2084f ffffffff80da0000 ffffffffc0149e= d8 fffffffffffffffe 80000000029e0000 80000000029e37e0 80000000029abf= 58 ffffffff80129fb0 0000000000000000 0000000000000000 00000000000000= 00 0000000000000000 0000000000000000 ffffffff80129fd0 00000000000000= 00 ... Call Trace: [] show_stack+0x60/0x158 [] dump_stack_lvl+0x88/0xbc [] lockdep_rcu_suspicious+0x1c0/0x240 [] __lock_acquire+0x121c/0x29d8 [] lock_acquire+0x184/0x448 [] _raw_spin_lock_irqsave+0x50/0x90 [] ___slab_alloc+0xa08/0x1808 [] __slab_alloc.isra.0+0x38/0x78 [] __kmem_cache_alloc_node+0x35c/0x370 [] __kmalloc+0x58/0xd0 [] r4k_tlb_uniquify+0x7c/0x428 [] tlb_init+0x7c/0x110 [] per_cpu_trap_init+0x16c/0x1d0 [] start_secondary+0x28/0x128 See also commit 55702ec9603e ("mips/smp: Call rcutree_report_cpu_starting() earlier"). Fixes: 841ecc979b18 ("MIPS: mm: kmalloc tlb_vpn array to avoid stack overfl= ow") Signed-off-by: Stefan Wiehler Cc: stable@vger.kernel.org --- V2 -> V3: Fix commit ID in Fixes: tag V1 -> V2: Reorder rcutree_report_cpu_starting() call in start_secondary(), fix function name v1: https://patchwork.kernel.org/project/linux-mips/patch/20260407083324.90= 6742-2-stefan.wiehler@nokia.com/ v2: https://patchwork.kernel.org/project/linux-mips/patch/20260409164846.31= 76046-2-stefan.wiehler@nokia.com/ --- arch/mips/kernel/smp.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/mips/kernel/smp.c b/arch/mips/kernel/smp.c index 4868e79f3b30..bdb47c70d4f5 100644 --- a/arch/mips/kernel/smp.c +++ b/arch/mips/kernel/smp.c @@ -359,8 +359,8 @@ asmlinkage void start_secondary(void) unsigned int cpu =3D raw_smp_processor_id(); =20 cpu_probe(); - per_cpu_trap_init(false); rcutree_report_cpu_starting(cpu); + per_cpu_trap_init(false); mips_clockevent_init(); mp_ops->init_secondary(); cpu_report(); --=20 2.42.0