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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: znH2p0jXfcjL0+kBM+ErUsBpKZ/1L7Efx7r3ihfOyV/xikbvitpndbVV+aoKAavI+7QYxUUulywgPWJKh1tybYUVRDsRPQHJz8/4DVdUMoEjCRoc9S682/oYOYed7m8ubhd8BFtR79r+VpDgn7KGnTbymj77e2ghuMOm+F21nqMcKlRV+iUbiVxOGaQKvUV3NNfXjwihNIcgKMOhkWhvOFF3lIVolKilLBZgIQS9bkok6uiV4qSpQK3mfWMIxEpljuiGUIFrR5Pk7NrEz1z386IFaWCfbTVJihDdAsFlINNz0B/zX102OJjneMQpSJtUtPVnA+O0N8JNQqO/8XYn2Qo3TqtT64KnzMhiQ7S7cxySRUxE46jZdVaiZbRVAcjShp6qFq7huMvNWppIIVlxonr707NcpL/nTmqBXLhGoIN4mm/8POTZwpO2CQXP5XJE X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 24 Feb 2026 11:17:20.2681 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 08e79aec-947b-4869-ad86-08de739646d1 X-MS-Exchange-CrossTenant-Id: f34e5979-57d9-4aaa-ad4d-b122a662184d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=f34e5979-57d9-4aaa-ad4d-b122a662184d;Ip=[4.158.2.129];Helo=[outbound-uk1.az.dlp.m.darktrace.com] X-MS-Exchange-CrossTenant-AuthSource: AMS0EPF00000198.eurprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: AS2PR08MB9426 On 24/02/2026 11:06, Leo Yan wrote: > On Mon, Feb 23, 2026 at 01:28:03PM +0000, Suzuki K Poulose wrote: > > [...] > >> [ 827.216924] Possible unsafe locking scenario: >> [ 827.216924] >> [ 827.222849] CPU0 CPU1 >> [ 827.227380] ---- ---- >> [ 827.231912] lock(coresight_mutex); >> [ 827.235491] lock(ect_mutex); >> [ 827.241073] lock(coresight_mutex); >> [ 827.247176] lock(ect_mutex); >> [ 827.250233] >> [ 827.250233] *** DEADLOCK *** > > Thanks for the test, Suzuki. > > I have sent a refactor patch to dismiss locking chain: > https://lore.kernel.org/linux-arm-kernel/20260224-arm_coresight_refactor_cti_resource_release-v1-1-ff1b2bca9176@arm.com/T/#u > > For recording, I enabled the following configs to reproduce the lockdep > report: > Thanks for the patch, I can confirm that it fixes the problem and is indeed a good cleanup. Hacking the device release operation wasn't really a good idea. Cheers Suzuki > CONFIG_LOCKUP_DETECTOR > CONFIG_PROVE_LOCKING > > Thanks, > Leo