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PH7PR12MB5688.namprd12.prod.outlook.com (2603:10b6:510:130::9) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.8655.22; Tue, 22 Apr 2025 08:28:46 +0000 Received: from IA1PR12MB6434.namprd12.prod.outlook.com ([fe80::dbf7:e40c:4ae9:8134]) by IA1PR12MB6434.namprd12.prod.outlook.com ([fe80::dbf7:e40c:4ae9:8134%3]) with mapi id 15.20.8655.033; Tue, 22 Apr 2025 08:28:45 +0000 Message-ID: <37775bf2-d571-434c-8670-827631e2eb12@amd.com> Date: Tue, 22 Apr 2025 13:58:39 +0530 User-Agent: Mozilla Thunderbird Subject: Re: AMD GPU driver load hitting BUG_ON in sync_global_pgds_l5() To: Balbir Singh , linux-kernel@vger.kernel.org, linux-mm@kvack.org Cc: Dave Hansen , luto@kernel.org, peterz@infradead.org, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, x86@kernel.org, hpa@zytor.com, nikunj@amd.com, kees@kernel.org, alexander.deucher@amd.com References: Content-Language: en-US From: Bharata B Rao In-Reply-To: Content-Type: text/plain; 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 22-Apr-25 12:44 PM, Balbir Singh wrote: > On 4/22/25 16:34, Bharata B Rao wrote: > > Could you please confirm if this is a new issue? Sounds like your hitting it on 6.8.12+? > I've never tested this on a system with 5 levels of page tables, but with 5 levels you get > 52 bits of VA and you'll need to look at the KASLR logic (max_pfn + padding) to see where > your ranges are getting assigned. I haven't been able to test this on latest upstream. Will get back on this as it can take considerable time to recreate. Same or similar-look bugs have been discussed earlier too: https://gitlab.freedesktop.org/drm/amd/-/issues/3244 Disabling 5 level tables seemed to have solved the issue though. > > I'd start by dumping the kaslr_regions array. Sure, Thanks. Regards, Bharata.