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Thu, 25 Sep 2025 06:51:56 +0000 Date: Thu, 25 Sep 2025 14:51:46 +0800 From: kernel test robot To: Marius Vlad CC: , , , , , , , , , Subject: Re: [PATCH 1/2] drm: Introduce a new connector status Message-ID: <202509251410.fdfbcac3-lkp@intel.com> Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: <20250923083636.4749-2-marius.vlad@collabora.com> X-ClientProxiedBy: SI1PR02CA0026.apcprd02.prod.outlook.com (2603:1096:4:1f4::11) To LV3PR11MB8603.namprd11.prod.outlook.com (2603:10b6:408:1b6::9) Precedence: bulk X-Mailing-List: oe-lkp@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: LV3PR11MB8603:EE_|MW4PR11MB5870:EE_ X-MS-Office365-Filtering-Correlation-Id: fce6fe19-ccf8-409c-4afa-08ddfc000470 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|366016|376014|7053199007; X-Microsoft-Antispam-Message-Info: =?us-ascii?Q?909kOPp8PGQAUVtOkR6HZKiGRBAaF6XitOF31CKi7vWLwnfJOIcTY8P3SN+Q?= =?us-ascii?Q?ZpZmlVu21ESRYuglUI+0wYggk/CNI5MEmvtPMw9wQK7zy0NWNiVLOhm/YSA5?= =?us-ascii?Q?3o2sJaoKJXVnKFc4Azs9KKR8y0VyU8qHf6vHO4o6m0lIKg4qdWAm/Zt3l+KJ?= =?us-ascii?Q?IrqUtDJZtlyZHulk01EPGoGiqnPk0g5vn2mYzvNyRcRCY5Iuoptpbt8OSfuz?= =?us-ascii?Q?/0jmI+mu/MqSsyfNEnlJh6WD4/fQqg/dkvNE0bjHAWnpfN8I7rtBepML6k+x?= =?us-ascii?Q?8WBdA9nvwsXMfDctSqhprNEoY1lH/NP6nkQDx50DI4Dmjtn+sfxsnIgU6iTs?= =?us-ascii?Q?HgGfSe0F1jF5u8DcEukmg7SGzFQk6B5bVW7/bR7o49M5xTz2pDm9IR4RkDv+?= =?us-ascii?Q?iYI3YrCUYgMw0/W0oDoqzVMBtHcEf9LnU45KVfaiWSpOGzRoNlDh1bYXNk5x?= =?us-ascii?Q?tsBBxKL56SJR5Z0KSxhilIcPWV6r5dhglJgW8ZlhZm6irMW1ZreCuEbZhCES?= =?us-ascii?Q?YrM8GYXcNdNvit0xjJeWeIjnb45u9QG+6tvnJbfjhIww1QkRLW7Yko21b03A?= =?us-ascii?Q?0IEeeNcrvWoXTUAXqPxYpNLXlBqqCjF4iYKpljaJW1Zy6TNWT8aUxKBBULrH?= =?us-ascii?Q?41xkcjNr+7otwDD3RCqbd3Q85gKeEWGiPAlZrdda4t0+HroU2b69RpTUntHI?= =?us-ascii?Q?FLmRoEoRcxUfHAAAtLjnbUVWjRxP6e2ECB3zGKfoMksGZ92R0Q/R+uSALz6X?= =?us-ascii?Q?Yjfg93G6RVB+MdsiZPZK8tFcK8ikPZaowTCvrQuKnzrBAvcSmI/Q20uhoA1m?= =?us-ascii?Q?clza+GDd8WnTelpp1oXoL/E71L/IEoPJaoiQzbO5W9ewhLsXD18nW7r4GJb3?= =?us-ascii?Q?phivsqYhe+eXkA/maTA4LMJLHHE102Y0ZmCXISHSi6xzB1eIzOMHVhIn597s?= =?us-ascii?Q?yvumVpAjEqwPtYf0RSzUqhZ2I1eg6S9+KFzk5LVIWrswxc1uMq4RK7ceceEn?= =?us-ascii?Q?5KykW/ANv148hE+uI3O9U+WAyUJhUAymuLhONCQCYOsABCgxHuVFM9l9pPkj?= =?us-ascii?Q?gBdxjyuKvhzjTEzvAGH0rV96rjRoVbAsVI8vEsYJAPRgu1EebiEdFAu1jrhc?= =?us-ascii?Q?lVNwKl9UFE/Q3Ucu5lmEOsStzqfXxTgb0/0pS2LadbwEqLya3xKwvGQ5tR+q?= =?us-ascii?Q?T/7vWd3EVsTF5YhnQ5nqfg0KUvvm09i1oOv+NlXNsYQx9jwJlJqTZLONTxty?= =?us-ascii?Q?e4sOosrkkXm8fUvQtHKzW+WCWJGR3EB9xivMFfU34hCCt//DfILNhi0LFHVv?= =?us-ascii?Q?hq7Zz7UgWbFqoRamXJGb8ufJB13lT8A//5QbFMkkVicXChG22xMD5bA0sFeb?= =?us-ascii?Q?IAP5tXszMQZRd99rC6JJqbaaTs7cl1qXoE4q9Zwcq6Ila4y/bQyuMSwht3RT?= =?us-ascii?Q?7h+lSz3EPk4=3D?= X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:LV3PR11MB8603.namprd11.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230040)(1800799024)(366016)(376014)(7053199007);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?us-ascii?Q?NhMhnCWDWAN0/0vcaF+APdiW3hV8RTLMX5x3fSPyiWKWVlkSSNZjppmKK9Ba?= =?us-ascii?Q?GHnE6FpfyXi9WFkn1rI75JqTa43cwjU8dukBte3qP+P/saxpUS4KzPv9KxU4?= =?us-ascii?Q?qhdESR+NENrZSPzDw/KighAwwVeOseAxvQOnUv7c2HzCyZ3sMQA6W6LPAibU?= =?us-ascii?Q?LbMBFmLMctwxOhuhVuBfZEVLpdifLGlULHnAqMeeLB8+mMw2D3j314gm59oL?= =?us-ascii?Q?+JiuQXDDHqWc15JJeJIoh9WSTT0PrkYl+W8IiA4564ntGwN3m5Gb1tAeAQ3R?= =?us-ascii?Q?Vv2dhZJwIwt/sYbtD8I2ncDaTfN0Lx355XgROIFViV2oGTVPWmfz+qMK5gUi?= =?us-ascii?Q?4RxTHhjFExDyKjuEfx4DFzPj9GGgQHPk7tujg7Jrhs+EpVWSPmTpTfZ5yXSz?= =?us-ascii?Q?3rCg0izOF91Xh432CrNuhJu6HMXTuAWlaBX3xCZWkJp3I7AW4S0abCHtqi+j?= =?us-ascii?Q?4lmNp3DPxdA5W+ulbm7Q5tzCnm2mS/FdsiUmU1aQvfe7YMolmFsoGrfFvnlI?= =?us-ascii?Q?OXDvjqUq92bHF/UwU3wIvpnTIjuNcqAXamsiNjMrNvfbvcx/wNQWzK/ab7tl?= =?us-ascii?Q?4+rV9cx1gx5ouBBkYpC6Pc5MoLVTRfiig0SDYu0l3m2bSEC9x3VMLsm0Oqiy?= =?us-ascii?Q?GXkz28tYkRin+tWzJaf9+Ca5NrnmrnxWaEXrfU9SW37nFNHmdDoqfapqzrgu?= =?us-ascii?Q?Zg6TuOWx7hQnMd4UYk6MSY+6XNoNPbSZDyeb3avMKEha9M3McM+WFGTCnlT4?= =?us-ascii?Q?tBYBZFJNPE6S/9Xw05/O4thlzCGYA62NdeU/DGD/aDyRtODRTZ9gjFTGnALO?= =?us-ascii?Q?yx6uPAO2j75jkpwmj+Ds9m8VqpG/g4o+mRfiObM9+YM43G96QM+69+lll840?= =?us-ascii?Q?0/vnOtJq+mw68kEHYu9KHo5WgxAVu4vrPMXRSvPNZtV5d+XBWyO82ukjwbWg?= =?us-ascii?Q?i+zEwk3ZKth2PIuOShtlv7R42xCVsP8VkcUPzmHVa5yYgPH7/Drnrq/HhVGL?= =?us-ascii?Q?XUbWmaizJDwTuAxsaI2ugPhODbPPXtEdv1CoQOrvXUxAlNY0esHjH4OX0LP9?= =?us-ascii?Q?Lynec3v0W2K89i6EVBQ2rZ37+2/C2FXsNhRLnWDK/AdnHAEo8xoTefgksHHp?= =?us-ascii?Q?J0hX9SWuO5FOixNg2y4AAd5yB1O/Kcd9AmFc8mf9qs/uRDc2uuO3du8Vlkq8?= =?us-ascii?Q?ugJFd9fYkuwS6LvXqdeFSoHgjzkwiLmww0k41VoFNVcRdTWj4/IRsKLAbcoW?= =?us-ascii?Q?TDN1uSQIl9TMxefvcaVG6xj9UdCDpw0+b8ej3U+A7aWOpGW5hvQ64poXvKJn?= =?us-ascii?Q?5nbJ+YMhnCV1/012MwS3ro8nmPXoxhnBXlgZ/g2dduHyOeRIRaIlbwoR/Nvg?= =?us-ascii?Q?ihzaZRCduRL5WNB2Wla9t18ct0vcAaGgStvr/TeqvN8HUdIgdI0qOBADPnZQ?= =?us-ascii?Q?7cD9gulr5I706jBj7FdELL5Po1GVjCkcQr24K8SjbFFZrf8zlrGOBJFnf4Q2?= =?us-ascii?Q?lT2EIYNUPZYuHLwego0aafCnDNvrv6FxwvflFaDgzDX4+GP6Ck213KFCOaNc?= =?us-ascii?Q?0lryLnixOYZAAKMAo8h7IPmhL4CU4CvgYM1wwV6oUfLEusDj56xQd4ghUzw4?= =?us-ascii?Q?GQ=3D=3D?= X-MS-Exchange-CrossTenant-Network-Message-Id: fce6fe19-ccf8-409c-4afa-08ddfc000470 X-MS-Exchange-CrossTenant-AuthSource: LV3PR11MB8603.namprd11.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 25 Sep 2025 06:51:56.2745 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 46c98d88-e344-4ed4-8496-4ed7712e255d X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: oGj134dc1sdnpT9S/P66tbioy8OBMMZbVpilyxqDSX4X9z8iFRP2ude6nB9GxRweQbT8cJHuzf4l3lwsQbjC6g== X-MS-Exchange-Transport-CrossTenantHeadersStamped: MW4PR11MB5870 X-OriginatorOrg: intel.com Hello, kernel test robot noticed "WARNING:possible_recursive_locking_detected" on: commit: 432c7653afa4afe08e59d608db7cbbc321c52149 ("[PATCH 1/2] drm: Introduce a new connector status") url: https://github.com/intel-lab-lkp/linux/commits/Marius-Vlad/drm-Introduce-a-new-connector-status/20250923-163922 base: git://anongit.freedesktop.org/drm/drm-misc drm-misc-next patch link: https://lore.kernel.org/all/20250923083636.4749-2-marius.vlad@collabora.com/ patch subject: [PATCH 1/2] drm: Introduce a new connector status in testcase: boot config: x86_64-randconfig-074-20250924 compiler: gcc-14 test machine: qemu-system-x86_64 -enable-kvm -cpu SandyBridge -smp 2 -m 16G (please refer to attached dmesg/kmsg for entire log/backtrace) If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot | Closes: https://lore.kernel.org/oe-lkp/202509251410.fdfbcac3-lkp@intel.com [ 19.416092][ T1] WARNING: possible recursive locking detected [ 19.416406][ T1] 6.17.0-rc2-00290-g432c7653afa4 #1 Not tainted [ 19.416406][ T1] -------------------------------------------- [ 19.416406][ T1] swapper/0/1 is trying to acquire lock: [ 19.416406][ T1] ffff88813b9c84d0 (&dev->mode_config.mutex){+.+.}-{4:4}, at: drm_helper_probe_single_connector_modes (drivers/gpu/drm/drm_probe_helper.c:633) [ 19.416406][ T1] [ 19.416406][ T1] but task is already holding lock: [ 19.416406][ T1] ffff88813b9c84d0 (&dev->mode_config.mutex){+.+.}-{4:4}, at: drm_client_modeset_probe (drivers/gpu/drm/drm_client_modeset.c:869) [ 19.416406][ T1] [ 19.416406][ T1] other info that might help us debug this: [ 19.416406][ T1] Possible unsafe locking scenario: [ 19.416406][ T1] [ 19.416406][ T1] CPU0 [ 19.416406][ T1] ---- [ 19.416406][ T1] lock(&dev->mode_config.mutex); [ 19.416406][ T1] [ 19.416406][ T1] *** DEADLOCK *** [ 19.416406][ T1] [ 19.416406][ T1] May be due to missing lock nesting notation [ 19.416406][ T1] [ 19.416406][ T1] 6 locks held by swapper/0/1: [ 19.416406][ T1] #0: ffff88813b9c8320 (&dev->clientlist_mutex){+.+.}-{4:4}, at: drm_client_register (include/linux/list.h:169 drivers/gpu/drm/drm_client.c:128) [ 19.416406][ T1] #1: ffff888108a882a0 (&helper->lock){+.+.}-{4:4}, at: drm_fb_helper_initial_config (drivers/gpu/drm/drm_fb_helper.c:1917) [ 19.416406][ T1] #2: ffff888108a88098 (&client->modeset_mutex){+.+.}-{4:4}, at: drm_client_modeset_probe (drivers/gpu/drm/drm_client_modeset.c:867) [ 19.416406][ T1] #3: ffff88813b9c84d0 (&dev->mode_config.mutex){+.+.}-{4:4}, at: drm_client_modeset_probe (drivers/gpu/drm/drm_client_modeset.c:869) [ 19.416406][ T1] #4: ffffc9000001fa78 (crtc_ww_class_acquire){+.+.}-{0:0}, at: drm_helper_probe_single_connector_modes (drivers/gpu/drm/drm_probe_helper.c:572) [ 19.416406][ T1] #5: ffffc9000001faa8 (crtc_ww_class_mutex){+.+.}-{4:4}, at: drm_helper_probe_single_connector_modes (drivers/gpu/drm/drm_probe_helper.c:572) [ 19.416406][ T1] [ 19.416406][ T1] stack backtrace: [ 19.416406][ T1] CPU: 0 UID: 0 PID: 1 Comm: swapper/0 Not tainted 6.17.0-rc2-00290-g432c7653afa4 #1 PREEMPT(none) [ 19.416406][ T1] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 19.416406][ T1] Call Trace: [ 19.416406][ T1] [ 19.416406][ T1] dump_stack_lvl (lib/dump_stack.c:122) [ 19.416406][ T1] print_deadlock_bug.cold (kernel/locking/lockdep.c:3044) [ 19.416406][ T1] validate_chain (kernel/locking/lockdep.c:3898) [ 19.416406][ T1] __lock_acquire (kernel/locking/lockdep.c:5237 (discriminator 1)) [ 19.416406][ T1] lock_acquire (kernel/locking/lockdep.c:470 kernel/locking/lockdep.c:5870) [ 19.416406][ T1] ? drm_helper_probe_single_connector_modes (drivers/gpu/drm/drm_probe_helper.c:633) [ 19.416406][ T1] ? sched_show_task (kernel/sched/core.c:8912) [ 19.416406][ T1] ? look_up_lock_class (kernel/locking/lockdep.c:933 (discriminator 28)) [ 19.416406][ T1] __mutex_lock (arch/x86/include/asm/atomic.h:23 include/linux/atomic/atomic-arch-fallback.h:457 include/linux/jump_label.h:262 include/trace/events/lock.h:95 kernel/locking/mutex.c:600 kernel/locking/mutex.c:760) [ 19.416406][ T1] ? drm_helper_probe_single_connector_modes (drivers/gpu/drm/drm_probe_helper.c:633) [ 19.416406][ T1] ? look_up_lock_class (kernel/locking/lockdep.c:933 (discriminator 28)) [ 19.416406][ T1] ? mutex_lock_io_nested (kernel/locking/mutex.c:759) [ 19.416406][ T1] ? drm_print_bits (drivers/gpu/drm/drm_print.c:334) [ 19.416406][ T1] ? ww_mutex_lock (kernel/locking/mutex.c:887) [ 19.416406][ T1] ? drm_helper_probe_single_connector_modes (drivers/gpu/drm/drm_probe_helper.c:633) [ 19.416406][ T1] drm_helper_probe_single_connector_modes (drivers/gpu/drm/drm_probe_helper.c:633) [ 19.416406][ T1] ? __drm_helper_update_and_validate (drivers/gpu/drm/drm_probe_helper.c:561) [ 19.416406][ T1] ? __kmalloc_noprof (include/trace/events/kmem.h:54 (discriminator 2) mm/slub.c:4366 (discriminator 2) mm/slub.c:4377 (discriminator 2)) [ 19.416406][ T1] drm_client_modeset_probe (drivers/gpu/drm/drm_client_modeset.c:869 (discriminator 1)) [ 19.416406][ T1] ? drm_client_firmware_config (drivers/gpu/drm/drm_client_modeset.c:818) [ 19.416406][ T1] __drm_fb_helper_initial_config_and_unlock (drivers/gpu/drm/drm_fb_helper.c:1830) [ 19.416406][ T1] drm_fbdev_client_hotplug (drivers/gpu/drm/clients/drm_fbdev_client.c:53) [ 19.416406][ T1] drm_client_register (drivers/gpu/drm/drm_client.c:141) [ 19.416406][ T1] drm_fbdev_client_setup (drivers/gpu/drm/clients/drm_fbdev_client.c:167) [ 19.416406][ T1] drm_client_setup (drivers/gpu/drm/clients/drm_client_setup.c:47) [ 19.416406][ T1] vkms_create (drivers/gpu/drm/vkms/vkms_drv.c:203) [ 19.416406][ T1] ? drm_display_helper_module_init (drivers/gpu/drm/vkms/vkms_drv.c:213) [ 19.416406][ T1] vkms_init (drivers/gpu/drm/vkms/vkms_drv.c:221) [ 19.416406][ T1] do_one_initcall (init/main.c:1269) [ 19.416406][ T1] ? trace_event_raw_event_initcall_level (init/main.c:1260) [ 19.416406][ T1] do_initcalls (init/main.c:1330 (discriminator 3) init/main.c:1347 (discriminator 3)) [ 19.416406][ T1] kernel_init_freeable (init/main.c:1583) [ 19.416406][ T1] ? rest_init (init/main.c:1461) [ 19.416406][ T1] kernel_init (init/main.c:1471) [ 19.416406][ T1] ? rest_init (init/main.c:1461) [ 19.416406][ T1] ret_from_fork (arch/x86/kernel/process.c:154) [ 19.416406][ T1] ? rest_init (init/main.c:1461) [ 19.416406][ T1] ret_from_fork_asm (arch/x86/entry/entry_64.S:255) [ 19.416406][ T1] [ 984.236393][ T23] INFO: task swapper/0:1 blocked for more than 491 seconds. [ 984.237354][ T23] Not tainted 6.17.0-rc2-00290-g432c7653afa4 #1 [ 984.238322][ T23] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 984.239375][ T23] task:swapper/0 state:D stack:0 pid:1 tgid:1 ppid:0 task_flags:0x0140 flags:0x00004000 [ 984.240834][ T23] Call Trace: [ 984.241228][ T23] [ 984.241634][ T23] __schedule (kernel/sched/core.c:5357 kernel/sched/core.c:6961) [ 984.242202][ T23] ? io_schedule_timeout (kernel/sched/core.c:6817) [ 984.242846][ T23] ? lock_acquire (include/trace/events/lock.h:24 (discriminator 2) kernel/locking/lockdep.c:5831 (discriminator 2)) [ 984.243441][ T23] schedule (kernel/sched/core.c:7044 kernel/sched/core.c:7058) [ 984.243975][ T23] schedule_preempt_disabled (kernel/sched/core.c:7116) [ 984.244639][ T23] __mutex_lock (kernel/locking/mutex.c:183 kernel/locking/mutex.c:678 kernel/locking/mutex.c:760) [ 984.245258][ T23] ? drm_helper_probe_single_connector_modes (drivers/gpu/drm/drm_probe_helper.c:633) [ 984.246160][ T23] ? mutex_lock_io_nested (kernel/locking/mutex.c:759) [ 984.246876][ T23] ? drm_print_bits (drivers/gpu/drm/drm_print.c:334) [ 984.247486][ T23] ? ww_mutex_lock (kernel/locking/mutex.c:887) [ 984.248132][ T23] ? ww_mutex_lock (kernel/locking/mutex.c:887) [ 984.248681][ T23] ? drm_helper_probe_single_connector_modes (drivers/gpu/drm/drm_probe_helper.c:633) [ 984.249557][ T23] drm_helper_probe_single_connector_modes (drivers/gpu/drm/drm_probe_helper.c:633) [ 984.250457][ T23] ? __drm_helper_update_and_validate (drivers/gpu/drm/drm_probe_helper.c:561) [ 984.251275][ T23] ? __kmalloc_noprof (include/trace/events/kmem.h:54 (discriminator 2) mm/slub.c:4366 (discriminator 2) mm/slub.c:4377 (discriminator 2)) [ 984.251990][ T23] drm_client_modeset_probe (drivers/gpu/drm/drm_client_modeset.c:869 (discriminator 1)) [ 984.252659][ T23] ? drm_client_firmware_config (drivers/gpu/drm/drm_client_modeset.c:818) [ 984.253433][ T23] __drm_fb_helper_initial_config_and_unlock (drivers/gpu/drm/drm_fb_helper.c:1830) [ 984.254309][ T23] drm_fbdev_client_hotplug (drivers/gpu/drm/clients/drm_fbdev_client.c:53) [ 984.255079][ T23] drm_client_register (drivers/gpu/drm/drm_client.c:141) [ 984.255737][ T23] drm_fbdev_client_setup (drivers/gpu/drm/clients/drm_fbdev_client.c:167) [ 984.256474][ T23] drm_client_setup (drivers/gpu/drm/clients/drm_client_setup.c:47) [ 984.257080][ T23] vkms_create (drivers/gpu/drm/vkms/vkms_drv.c:203) [ 984.257646][ T23] ? drm_display_helper_module_init (drivers/gpu/drm/vkms/vkms_drv.c:213) [ 984.258477][ T23] vkms_init (drivers/gpu/drm/vkms/vkms_drv.c:221) [ 984.258979][ T23] do_one_initcall (init/main.c:1269) [ 984.259580][ T23] ? trace_event_raw_event_initcall_level (init/main.c:1260) [ 984.260457][ T23] do_initcalls (init/main.c:1330 (discriminator 3) init/main.c:1347 (discriminator 3)) [ 984.261031][ T23] kernel_init_freeable (init/main.c:1583) [ 984.261730][ T23] ? rest_init (init/main.c:1461) [ 984.262250][ T23] kernel_init (init/main.c:1471) [ 984.262775][ T23] ? rest_init (init/main.c:1461) [ 984.263366][ T23] ret_from_fork (arch/x86/kernel/process.c:154) [ 984.263966][ T23] ? rest_init (init/main.c:1461) [ 984.264445][ T23] ret_from_fork_asm (arch/x86/entry/entry_64.S:255) [ 984.265087][ T23] [ 984.265460][ T23] INFO: task swapper/0:1 is blocked on a mutex likely owned by task swapper/0:1. [ 984.266569][ T23] task:swapper/0 state:D stack:0 pid:1 tgid:1 ppid:0 task_flags:0x0140 flags:0x00004000 [ 984.267995][ T23] Call Trace: [ 984.268440][ T23] [ 984.268818][ T23] __schedule (kernel/sched/core.c:5357 kernel/sched/core.c:6961) [ 984.269392][ T23] ? io_schedule_timeout (kernel/sched/core.c:6817) [ 984.270076][ T23] ? lock_acquire (include/trace/events/lock.h:24 (discriminator 2) kernel/locking/lockdep.c:5831 (discriminator 2)) [ 984.270650][ T23] schedule (kernel/sched/core.c:7044 kernel/sched/core.c:7058) [ 984.271187][ T23] schedule_preempt_disabled (kernel/sched/core.c:7116) [ 984.271938][ T23] __mutex_lock (kernel/locking/mutex.c:183 kernel/locking/mutex.c:678 kernel/locking/mutex.c:760) [ 984.272512][ T23] ? drm_helper_probe_single_connector_modes (drivers/gpu/drm/drm_probe_helper.c:633) [ 984.273417][ T23] ? mutex_lock_io_nested (kernel/locking/mutex.c:759) [ 984.274100][ T23] ? drm_print_bits (drivers/gpu/drm/drm_print.c:334) [ 984.274700][ T23] ? ww_mutex_lock (kernel/locking/mutex.c:887) [ 984.275321][ T23] ? ww_mutex_lock (kernel/locking/mutex.c:887) [ 984.275900][ T23] ? drm_helper_probe_single_connector_modes (drivers/gpu/drm/drm_probe_helper.c:633) [ 984.276788][ T23] drm_helper_probe_single_connector_modes (drivers/gpu/drm/drm_probe_helper.c:633) [ 984.277636][ T23] ? __drm_helper_update_and_validate (drivers/gpu/drm/drm_probe_helper.c:561) [ 984.278471][ T23] ? __kmalloc_noprof (include/trace/events/kmem.h:54 (discriminator 2) mm/slub.c:4366 (discriminator 2) mm/slub.c:4377 (discriminator 2)) [ 984.279094][ T23] drm_client_modeset_probe (drivers/gpu/drm/drm_client_modeset.c:869 (discriminator 1)) [ 984.279852][ T23] ? drm_client_firmware_config (drivers/gpu/drm/drm_client_modeset.c:818) [ 984.280602][ T23] __drm_fb_helper_initial_config_and_unlock (drivers/gpu/drm/drm_fb_helper.c:1830) [ 984.281537][ T23] drm_fbdev_client_hotplug (drivers/gpu/drm/clients/drm_fbdev_client.c:53) [ 984.282238][ T23] drm_client_register (drivers/gpu/drm/drm_client.c:141) [ 984.282887][ T23] drm_fbdev_client_setup (drivers/gpu/drm/clients/drm_fbdev_client.c:167) [ 984.283611][ T23] drm_client_setup (drivers/gpu/drm/clients/drm_client_setup.c:47) [ 984.284232][ T23] vkms_create (drivers/gpu/drm/vkms/vkms_drv.c:203) [ 984.284846][ T23] ? drm_display_helper_module_init (drivers/gpu/drm/vkms/vkms_drv.c:213) [ 984.285609][ T23] vkms_init (drivers/gpu/drm/vkms/vkms_drv.c:221) [ 984.286136][ T23] do_one_initcall (init/main.c:1269) [ 984.286773][ T23] ? trace_event_raw_event_initcall_level (init/main.c:1260) [ 984.287581][ T23] do_initcalls (init/main.c:1330 (discriminator 3) init/main.c:1347 (discriminator 3)) [ 984.288212][ T23] kernel_init_freeable (init/main.c:1583) [ 984.288856][ T23] ? rest_init (init/main.c:1461) [ 984.289412][ T23] kernel_init (init/main.c:1471) [ 984.289983][ T23] ? rest_init (init/main.c:1461) [ 984.290537][ T23] ret_from_fork (arch/x86/kernel/process.c:154) [ 984.291124][ T23] ? rest_init (init/main.c:1461) [ 984.291735][ T23] ret_from_fork_asm (arch/x86/entry/entry_64.S:255) [ 984.292371][ T23] [ 984.292826][ T23] INFO: lockdep is turned off. [ 1045.677903][ C0] BUG: workqueue lockup - pool cpus=0 node=0 flags=0x0 nice=0 stuck for 59s! [ 1045.680667][ C0] Showing busy workqueues and worker pools: [ 1045.684192][ C0] workqueue events_power_efficient: flags=0x80 [ 1045.684971][ C0] pwq 2: cpus=0 node=0 flags=0x0 nice=0 active=3 refcnt=4 [ 1045.684987][ C0] pending: neigh_managed_work, neigh_periodic_work, do_cache_clean [ 1045.685083][ C0] Showing backtraces of running workers in stalled CPU-bound worker pools: [ 1076.396346][ C0] BUG: workqueue lockup - pool cpus=0 node=0 flags=0x0 nice=0 stuck for 89s! [ 1076.400410][ C0] Showing busy workqueues and worker pools: [ 1076.401145][ C0] workqueue events: flags=0x0 [ 1076.401765][ C0] pwq 2: cpus=0 node=0 flags=0x0 nice=0 active=1 refcnt=2 [ 1076.401781][ C0] pending: stop_one_cpu_nowait_workfn [ 1076.401795][ C0] workqueue events_power_efficient: flags=0x80 [ 1076.404125][ C0] pwq 2: cpus=0 node=0 flags=0x0 nice=0 active=3 refcnt=4 [ 1076.404141][ C0] pending: neigh_managed_work, neigh_periodic_work, do_cache_clean [ 1076.411517][ C0] Showing backtraces of running workers in stalled CPU-bound worker pools: The kernel config and materials to reproduce are available at: https://download.01.org/0day-ci/archive/20250925/202509251410.fdfbcac3-lkp@intel.com -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki