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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?us-ascii?Q?zrKrFoT4L86AWYuH+4n/i+5S8HqBpf07m7dbtjR2bNubIPSfZD0CxtYiWnGI?= =?us-ascii?Q?IZYTXsIYzwHfKJwpQ/bMO/St9qOKjiyDE9yefNmRWqsHbTjZEXSb7taSbCQN?= =?us-ascii?Q?og5mlqxO97K36cVDO/bEb08/Xr9YVMidqiX+q6LQot08/Y1Mdavzk/2wb0Ul?= =?us-ascii?Q?eONBUAEi5CvvN5yxSRg+2yzZHtjSLIGkC7eIXosoCubODr+GXoId2Kl2dYiR?= =?us-ascii?Q?GBqP6AQQgf3v47OvaqLhy2jiB/fGJm05fwHDvyUP4BIyZrHAPYxPvjjDYwbI?= =?us-ascii?Q?Tqf+xQCrfLDR48HYbugCOUO0ByYZCB4KfM2raXDndeWQYocG+5FwBxCM9/gt?= =?us-ascii?Q?RpsElh6ziUsMIJv0tgoL8gAd5ra4a2dG3SuqEowlqLRlw/g9gr33oOn+klaP?= =?us-ascii?Q?Pz1yyu29HJYWzhgA3MlJor8pbLNKsQwrdAQavL12BkJ/f/hbgVAa3GMthBTm?= =?us-ascii?Q?iyxl5hXShF4y4Y/l1JWPXKQ48dUy/HXWZIZ4bBlp/ERV694qTwVLCG/dE0eT?= =?us-ascii?Q?Qq0sar7zOzrqHmqeT44C3wWkOfdv6Yq9LJTbfTjxxbC9k/mVZIaWgeBM1rdL?= =?us-ascii?Q?cSLrAwqvB8KRwrGPhHEt5TfFCgKk546ho1u1w28kOLhnPincavBJIHZdywh/?= =?us-ascii?Q?fmBaJufw9XzebE2AAWIo//oLG27Aa8z+czUrDEN8EoWTULL4OlOSzg+WEESe?= =?us-ascii?Q?33UE7E2S2rU20bt+zPAJ8W3hmplA1W70Ngdy3dusV5l8Y+Mp1GYn6J1csKyp?= =?us-ascii?Q?fyOdiEvOEPYC+how3CWISze2NYRurdV+reYXeB+mERwnrXuKNyh9TDhkfzez?= =?us-ascii?Q?Qjg6etk+wglUQvPh0yeURScQWDkhZuhzKr2K0ayIDWti2iiZ2wMJHXaicpxz?= =?us-ascii?Q?rDDelL1nq1gng185xUrdqLfaB14V17D2jQra/nRyzrtDr9gCbzGyAIYd47SQ?= =?us-ascii?Q?+twN0sbDFcQ1Ygw2aUJ+q16JANTTiBdNHSdWWc8iXoTTVcpUh7YC6YbGca56?= =?us-ascii?Q?GpHfaIwvBJHzCOB8mxalwLmgPRol7bursofdO6I+nxWEozermfdqx430ihHY?= =?us-ascii?Q?FuuE0Ml447SuO50C4yWZCfkoLdbXwKCI2vwKhbKNwNSrwTi7Ia/y62Rf+CW6?= =?us-ascii?Q?qQtXn0NHnt/FN+cPrz/P7JAc3nR9MSDW+ZrWR4QOHHsdqDz1j+uYCm813zli?= =?us-ascii?Q?lCg+RQ1Ll9a02Z1XgPvlOFf4UQHWOA6XDNO1bozzEj7vScdCG1xnc9nVIRAw?= =?us-ascii?Q?95X3RJ+ULbOzzn38nA7ANxAgyZS+6yAEt0bFPYqbTWero443GbTVzA6X8KVb?= =?us-ascii?Q?Y/YUTyptjMOiHkZqBYLznIQZo6yLm8VX8io3tPPNlMXfqcqLTclejBZ3HnRf?= =?us-ascii?Q?2c3VYENz1vPWtZtYl2JLBkZ19E9yOwO5vY5MmJiKFy2yIqomrUOBN04EALgv?= =?us-ascii?Q?Ikn5uuyWY2y/6MzzJ82VDvTbva1LY9HakhtJ1VhPZx0wd3cSVtCiZ6hOQPaN?= =?us-ascii?Q?9vi9+iLOJMKetZUBETrR4dH7fHhmLTGtDqDnHAKWe99i6oFnBl3RQJfMG+KK?= =?us-ascii?Q?odjtyn67cplQrrV4FDt5AfAgflHlHWDET4srGm3FaAT+DakLoxJLdtQTndb5?= =?us-ascii?Q?TA=3D=3D?= X-MS-Exchange-CrossTenant-Network-Message-Id: c46323ac-296c-42bc-785a-08dd4b21bb95 X-MS-Exchange-CrossTenant-AuthSource: LV3PR11MB8603.namprd11.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 12 Feb 2025 04:57:21.0389 (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: LyN3mmZxBrwyJ6R8ZuLzRn9HoAcyKcqw/XreDJlhnnDYmw3Nn/aRxGMumgMEHGQ+sJiYnz2JYqc+wINeTP4EZA== X-MS-Exchange-Transport-CrossTenantHeadersStamped: CH3PR11MB8702 X-OriginatorOrg: intel.com Hello, we noticed the issue happens with a low rate on this commit, but keeps clean on parent when we even run the tests up to 999 times. just FYI. 41f70d8e16349c65 b04e317b522630b46f78ee62ecb ---------------- --------------------------- fail:runs %reproduction fail:runs | | | :999 2% 16:999 dmesg.INFO:task_blocked_for_more_than#seconds :999 2% 16:999 dmesg.Kernel_panic-not_syncing:hung_task:blocked_tasks kernel test robot noticed "INFO:task_blocked_for_more_than#seconds" on: commit: b04e317b522630b46f78ee62ecbdc5734e8d43de ("treewide: Introduce kthread_run_worker[_on_cpu]()") https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master [test failed on linus/master 7ee983c850b40043ac4751836fbd9a2b4d0c5937] [test failed on linux-next/master ed58d103e6da15a442ff87567898768dc3a66987] in testcase: rcuscale version: with following parameters: runtime: 300s scale_type: rcu config: i386-randconfig-052-20250205 compiler: gcc-12 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/202502121025.55bfa801-lkp@intel.com [ 1023.501569][ T32] INFO: task UVCG:82 blocked for more than 491 seconds. [ 1023.510932][ T32] Tainted: G T 6.13.0-rc2-00014-gb04e317b5226 #1 [ 1023.528506][ T32] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 1023.551252][ T32] task:UVCG state:D stack:0 pid:82 tgid:82 ppid:2 flags:0x00004000 [ 1023.582336][ T32] Call Trace: [ 1023.599286][ T32] __schedule (kernel/sched/core.c:5372 kernel/sched/core.c:6756) [ 1023.617204][ T32] ? __this_cpu_preempt_check (lib/smp_processor_id.c:67) [ 1023.637326][ T32] schedule (kernel/sched/core.c:6834 kernel/sched/core.c:6848) [ 1023.653175][ T32] schedule_preempt_disabled (kernel/sched/core.c:6906) [ 1023.672095][ T32] kthread (kernel/kthread.c:453) [ 1023.684220][ T32] ? kthread_flush_work (kernel/kthread.c:970) [ 1023.700611][ T32] ? kthread_is_per_cpu (kernel/kthread.c:413) [ 1023.716756][ T32] ret_from_fork (arch/x86/kernel/process.c:153) [ 1023.732758][ T32] ? kthread_is_per_cpu (kernel/kthread.c:413) [ 1023.748605][ T32] ret_from_fork_asm (arch/x86/entry/entry_32.S:737) [ 1023.764004][ T32] entry_INT80_32 (arch/x86/entry/entry_32.S:942) [ 1023.776959][ T32] [ 1023.776959][ T32] Showing all locks held in the system: [ 1023.803410][ T32] 1 lock held by khungtaskd/32: [ 1023.815913][ T32] #0: c3baa3d4 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire (include/linux/rcupdate.h:336) [ 1023.842061][ T32] 1 lock held by in:imklog/227: [ 1023.849815][ T32] #0: ecd0e884 (&f->f_pos_lock){+.+.}-{4:4}, at: fdget_pos (fs/file.c:1194) [ 1023.877481][ T32] 1 lock held by dmesg/494: [ 1023.885260][ T32] 2 locks held by depmod/567: [ 1023.903871][ T32] [ 1023.907007][ T32] ============================================= [ 1023.907007][ T32] [ 1023.938278][ T32] Kernel panic - not syncing: hung_task: blocked tasks [ 1023.951013][ T32] CPU: 0 UID: 0 PID: 32 Comm: khungtaskd Tainted: G T 6.13.0-rc2-00014-gb04e317b5226 #1 78ab3595737b7bb7ccfbfed5c1dcb65e25af99a7 [ 1023.973770][ T32] Tainted: [T]=RANDSTRUCT [ 1023.979010][ T32] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 [ 1023.991787][ T32] Call Trace: [ 1023.995862][ T32] dump_stack_lvl (lib/dump_stack.c:122) [ 1024.001535][ T32] dump_stack (lib/dump_stack.c:130) [ 1024.006622][ T32] panic (kernel/panic.c:258 kernel/panic.c:375) [ 1024.011360][ T32] check_hung_uninterruptible_tasks (kernel/hung_task.c:239) [ 1024.018678][ T32] watchdog (kernel/hung_task.c:398) [ 1024.023798][ T32] kthread (kernel/kthread.c:466) [ 1024.028697][ T32] ? check_hung_uninterruptible_tasks (kernel/hung_task.c:380) [ 1024.036601][ T32] ? kthread_is_per_cpu (kernel/kthread.c:413) [ 1024.042763][ T32] ret_from_fork (arch/x86/kernel/process.c:153) [ 1024.048431][ T32] ? kthread_is_per_cpu (kernel/kthread.c:413) [ 1024.054588][ T32] ret_from_fork_asm (arch/x86/entry/entry_32.S:737) [ 1024.060422][ T32] entry_INT80_32 (arch/x86/entry/entry_32.S:942) [ 1024.067908][ T32] Kernel Offset: disabled The kernel config and materials to reproduce are available at: https://download.01.org/0day-ci/archive/20250212/202502121025.55bfa801-lkp@intel.com -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki