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Tue, 25 Mar 2025 13:43:19 +0000 Received: from MW6PR12MB8663.namprd12.prod.outlook.com ([fe80::594:5be3:34d:77f]) by MW6PR12MB8663.namprd12.prod.outlook.com ([fe80::594:5be3:34d:77f%2]) with mapi id 15.20.8534.040; Tue, 25 Mar 2025 13:43:19 +0000 Date: Tue, 25 Mar 2025 10:43:17 -0300 From: Jason Gunthorpe To: Nicolin Chen , Josh Poimboeuf , Peter Zijlstra Cc: "Borah, Chaitanya Kumar" , "iommu@lists.linux.dev" , "intel-gfx@lists.freedesktop.org" , "intel-xe@lists.freedesktop.org" , "Kurmi, Suresh Kumar" , "Saarinen, Jani" Subject: Re: Regression on linux-next (next-20250321) Message-ID: References: Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-ClientProxiedBy: BL0PR02CA0001.namprd02.prod.outlook.com (2603:10b6:207:3c::14) To MW6PR12MB8663.namprd12.prod.outlook.com (2603:10b6:303:240::9) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: MW6PR12MB8663:EE_|CH2PR12MB9457:EE_ X-MS-Office365-Filtering-Correlation-Id: b351a13e-0f09-462e-0448-08dd6ba300d4 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|1800799024|366016; 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I am Chaitanya from the linux graphics team in Intel. > > > > This mail is regarding a regression we are seeing in our CI runs[1] on linux-next repository. > > > > Since the version next-20250321 [2], we are seeing the following regression > > > > ````````````````````````````````````````````````````````````````````````````````` > > <4>[ 0.226495] Unpatched return thunk in use. This should not happen! > > <4>[ 0.226502] WARNING: CPU: 0 PID: 1 at arch/x86/kernel/cpu/bugs.c:3107 __warn_thunk+0x62/0x70 > > Hmm....I wonder why x86 can be affected... I wonder if this is realted to the objtool warning Steven reported: https://lore.kernel.org/linux-next/20250321193600.2bfe03bb@canb.auug.org.au/ vmlinux.o: warning: objtool: iommu_dma_get_msi_page() falls through to next function __iommu_dma_unmap() I have no idea what either error means or how to fix it. AFAICT there is nothing special about this patch to trigger this? +Peter & Josh Jason