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Rozycki" , "Jiaxun Yang" Cc: linux-mips@vger.kernel.org, linux-kernel@vger.kernel.org, stable@vger.kernel.org, Stefan Wiehler Subject: [PATCH v2] mips: mm: Call rcutree_report_cpu_starting() even earlier Date: Thu, 9 Apr 2026 18:48:47 +0200 Message-ID: <20260409164846.3176046-2-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: DU2PEPF00028D00:EE_|DU4PR07MB11687:EE_ X-MS-Office365-Filtering-Correlation-Id: 2fccad73-d07f-42b6-30be-08de96581179 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|82310400026|376014|36860700016|1800799024|18002099003|56012099003|13003099007; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:131.228.2.84;CTRY:FI;LANG:en;SCL:1;SRV:;IPV:CAL;SFV:NSPM;H:fihe01smtplvp01.emea.nsn-net.net;PTR:InfoDomainNonexistent;CAT:NONE;SFS:(13230040)(82310400026)(376014)(36860700016)(1800799024)(18002099003)(56012099003)(13003099007);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: bTw7yYuJJWpo7GvJ923Ij2Mu8664U0hQCJVcuXdmDODRwNz1/k7iskrGXfwJC34E4UZCHGCrpD4Hsbl1VWOvHHwKKDrY4yzGjKSfvtmNd9ZBiPO2jgG/DqdvDVbM1BMzWGmVA05gQoOoCGwrxEtUjtonIRZ9fnUPXDQtmIcOqk29BgKgDvQU/1DR3lKH4+HHm+zf5yAxSQvScYfhXcIHFj2HiVd0VbZ3rOC0zItI7KlNOA1d/mghO2tHcAEE7ibTn77zAmRNiLG5zhOgjDWX972fBAOT1b4Zjt8o9ICQptx8ttIZnJel69yCqvsDUQLFlQEeeJ2OMj27QrDfrJEIC9kOwmqD5+n6kTPKhVEEla7cOYCK84vbsiOZzXq273fqrCAY0HCk8xGwMfGpYOnQ15iQhIgMOyXx9eqPaNnj0ov4UxJ433g2avmH+12t7gmO X-OriginatorOrg: nokia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 09 Apr 2026 16:50:12.6578 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 2fccad73-d07f-42b6-30be-08de96581179 X-MS-Exchange-CrossTenant-Id: 5d471751-9675-428d-917b-70f44f9630b0 X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=5d471751-9675-428d-917b-70f44f9630b0;Ip=[131.228.2.84];Helo=[fihe01smtplvp01.emea.nsn-net.net] X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: TreatMessagesAsInternal-DU2PEPF00028D00.eurprd03.prod.outlook.com X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DU4PR07MB11687 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: 231ac951faba ("MIPS: mm: kmalloc tlb_vpn array to avoid stack overfl= ow") Signed-off-by: Stefan Wiehler Cc: stable@vger.kernel.org --- 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/ --- 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