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[ 125.183478][ T21] [ 125.183478][ T21] other info that might help us debug this: [ 125.183478][ T21] [ 125.184868][ T21] [ 125.184868][ T21] rcu_scheduler_active = 2, debug_locks = 1 [ 125.208754][ T21] 3 locks held by cpuhp/1/21: [ 125.209326][ T21] #0: c306b6cc (cpu_hotplug_lock){++++}-{0:0}, at: lockdep_acquire_cpus_lock (kernel/cpu.c:538) [ 125.210479][ T21] #1: c306b7d0 (cpuhp_state-down){+.+.}-{0:0}, at: cpuhp_lock_acquire (kernel/cpu.c:102) [ 125.211538][ T21] #2: c33ac828 (pmus_lock){+.+.}-{3:3}, at: perf_event_exit_cpu (kernel/events/core.c:13962 include/asm-generic/bitops/instrumented-atomic.h:42 include/linux/cpumask.h:529 kernel/events/core.c:13928 kernel/events/core.c:13967 kernel/events/core.c:14041) [ 125.212625][ T21] [ 125.212625][ T21] stack backtrace: [ 125.213367][ T21] CPU: 1 UID: 0 PID: 21 Comm: cpuhp/1 Not tainted 6.11.0-rc5-00040-g4ba4f1afb6a9 #1 [ 125.216087][ T21] Call Trace: [ 125.216541][ T21] dump_stack_lvl (lib/dump_stack.c:121) [ 125.217219][ T21] dump_stack (lib/dump_stack.c:128) [ 125.217785][ T21] lockdep_rcu_suspicious (include/linux/context_tracking.h:122 include/linux/context_tracking.h:143 kernel/locking/lockdep.c:6684) [ 125.218515][ T21] perf_event_exit_cpu (kernel/events/core.c:? kernel/events/core.c:13967 kernel/events/core.c:14041) [ 125.219211][ T21] cpuhp_invoke_callback (kernel/cpu.c:194) [ 125.219935][ T21] ? perf_event_init_cpu (kernel/events/core.c:14040) [ 125.220755][ T21] cpuhp_thread_fun (kernel/cpu.c:1102) [ 125.221431][ T21] smpboot_thread_fn (kernel/smpboot.c:?) [ 125.222120][ T21] kthread (kernel/kthread.c:391) [ 125.222888][ T21] ? smpboot_unregister_percpu_thread (kernel/smpboot.c:107) [ 125.223731][ T21] ? kthread_unuse_mm (kernel/kthread.c:342) [ 125.224312][ T21] ? kthread_unuse_mm (kernel/kthread.c:342) [ 125.224906][ T21] ret_from_fork (arch/x86/kernel/process.c:153) [ 125.225425][ T21] ret_from_fork_asm (??:?) [ 125.226044][ T21] entry_INT80_32 (init_task.c:?) The kernel config and materials to reproduce are available at: https://download.01.org/0day-ci/archive/20240913/202409131559.545634cc-oliver.sang@intel.com -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki