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client-ip=165.204.84.17; helo=satlexmb08.amd.com; pr=C Received: from satlexmb08.amd.com (165.204.84.17) by BN3PEPF0000B06C.mail.protection.outlook.com (10.167.243.71) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.9632.0 via Frontend Transport; Tue, 10 Feb 2026 18:09:25 +0000 Received: from satlexmb10.amd.com (10.181.42.219) by satlexmb08.amd.com (10.181.42.217) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.2562.17; Tue, 10 Feb 2026 12:09:25 -0600 Received: from satlexmb08.amd.com (10.181.42.217) by satlexmb10.amd.com (10.181.42.219) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.2562.17; Tue, 10 Feb 2026 12:09:25 -0600 Received: from [172.31.184.125] (10.180.168.240) by satlexmb08.amd.com (10.181.42.217) with Microsoft SMTP Server id 15.2.2562.17 via Frontend Transport; Tue, 10 Feb 2026 12:09:20 -0600 Message-ID: <04ffa7ce-85ba-431b-91ab-f725f31b03ed@amd.com> Date: Tue, 10 Feb 2026 23:39:14 +0530 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 0/4] sched: Various reweight_entity() fixes To: Doug Smythies , 'Peter Zijlstra' CC: , , , , , , , , , , , References: <20260130093439.803225718@infradead.org> <4c48fe59-8ff3-41fb-83cb-869409f6fbc6@amd.com> <20260203111134.GL1282955@noisy.programming.kicks-ass.net> <38ef3462-4c4e-4f40-8d63-84dd71cbd043@amd.com> <20260209154718.GW1282955@noisy.programming.kicks-ass.net> <001901dc9aa3$cbad47f0$6307d7d0$@telus.net> Content-Language: en-US From: K Prateek Nayak In-Reply-To: <001901dc9aa3$cbad47f0$6307d7d0$@telus.net> Content-Type: text/plain; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: 87lMLo5nEywoc+pSzlcvNZ4948p5/2ZbEfH+T5CtZ58jC5+beSxYfbIj5BNIBx8+lWi1ffwmXcX/aXaSYVM98mLhQpeltnK/hp9bnCnxtQw+shP+dVsGlnekKLga8I00/d1WmZ+u/Iky4IfM3aRRJydPhQ30jrrtO9WSCnioL6dYr89KJcaWObRhvczOHnFKXcyhmmi6WCJGxS6HROEdQWdT4oVNjGz4VrG7gP353iuRNX/6ReDBVIU4X1llcyFJC6Lg0oRNWbUU661OyUq3s///b9qdT/RJ1ojy2HQKQmid1l0f67DNbPbwpfWiI5/6E9WMenCUnNXbD2k1wBNJfHf5BPWJrl+XpWgr8BYcf393Ac1KD+vC8XEPZ4hwJcZKbDJIfA2ca9N3KDec+hf4X0JVPlCV5YHmQA8T8p2jiyzjx/17id+mjNkIjzf4boC6 X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 10 Feb 2026 18:09:25.9069 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: d8e0f13a-73bf-4dd8-8c85-08de68cf86a2 X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[satlexmb08.amd.com] X-MS-Exchange-CrossTenant-AuthSource: BN3PEPF0000B06C.namprd21.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SA1PR12MB5658 Hello Doug, On 2/10/2026 9:11 PM, Doug Smythies wrote: > My test computer also hung under the heavy heavy load test, > albeit at a higher load than before. > There was no log information that I could find after the re-boot. Could you run the same scenario with PARANOID_AVG: echo PARANOID_AVG > /sys/kernel/debug/sched/features and once you are past the point when the system would have usually hung, can check if the "sum_shifts" reported for cfs_rq in the debugfs have changed to some non-zero value: grep "shift.*: [^0]$" /sys/kernel/debug/sched/debug I'm assuming this is the same "yes" x 12500 copies bomb that failed. Let me see if I can reproduce this on my setup by leaving it going overnight on a limited cpuset. Since you mentioned there is some bound to the number of copies when the hang is observed, can you please share your system details and the number of CPUs it has? -- Thanks and Regards, Prateek