rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P282 (detected by 1, t=10503 jiffies, g=61629, q=41) kworker/u4:6 R running task 24784 282 2 0x80004000 Workqueue: bat_events batadv_mcast_mla_update Call Trace: context_switch kernel/sched/core.c:3367 [inline] __schedule+0x937/0x1ff0 kernel/sched/core.c:4083 __sched_text_start+0x8/0x8 check_preemption_disabled lib/smp_processor_id.c:16 [inline] __this_cpu_preempt_check+0x28/0x190 lib/smp_processor_id.c:64 set_irq_regs arch/x86/include/asm/irq_regs.h:27 [inline] smp_apic_timer_interrupt+0x1b6/0x600 arch/x86/kernel/apic/apic.c:1142 preempt_schedule_thunk+0x16/0x18 arch/x86/entry/thunk_64.S:50 preempt_schedule_common+0x4a/0xc0 kernel/sched/core.c:4239 preempt_schedule_thunk+0x16/0x18 arch/x86/entry/thunk_64.S:50 unwind_next_frame+0x1073/0x1df0 arch/x86/kernel/unwind_orc.c:604 stack_trace_save+0x8c/0xc0 kernel/stacktrace.c:123 deref_stack_reg+0xe0/0xe0 arch/x86/kernel/unwind_orc.c:354 test_bit include/asm-generic/bitops/instrumented-non-atomic.h:110 [inline] hlock_class kernel/locking/lockdep.c:179 [inline] mark_lock+0x12b/0xf10 kernel/locking/lockdep.c:3912 profile_setup.cold+0xc1/0xc1 arch_stack_walk+0x81/0xf0 arch/x86/kernel/stacktrace.c:25 save_stack+0x1b/0x40 mm/kasan/common.c:49 stack_trace_save+0x8c/0xc0 kernel/stacktrace.c:123 stack_trace_consume_entry+0x160/0x160 kernel/stacktrace.c:93 print_usage_bug+0x240/0x240 kernel/locking/lockdep.c:101 print_usage_bug+0x240/0x240 kernel/locking/lockdep.c:101 save_stack+0x1b/0x40 mm/kasan/common.c:49 test_bit include/asm-generic/bitops/instrumented-non-atomic.h:110 [inline] hlock_class kernel/locking/lockdep.c:179 [inline] __lock_acquire+0xcbb/0x4c50 kernel/locking/lockdep.c:4352 mark_held_locks+0xe0/0xe0 kernel/locking/lockdep.c:3620 mark_held_locks+0xe0/0xe0 kernel/locking/lockdep.c:3620 test_bit include/asm-generic/bitops/instrumented-non-atomic.h:110 [inline] hlock_class kernel/locking/lockdep.c:179 [inline] mark_lock+0x12b/0xf10 kernel/locking/lockdep.c:3912 print_usage_bug+0x240/0x240 kernel/locking/lockdep.c:101 lock_acquire+0x1f2/0x8f0 kernel/locking/lockdep.c:4934 kasan_poison_shadow mm/kasan/common.c:131 [inline] kasan_unpoison_shadow+0x30/0x40 mm/kasan/common.c:145 set_track mm/kasan/common.c:57 [inline] __kasan_kmalloc mm/kasan/common.c:495 [inline] __kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:468 slab_alloc mm/slab.c:3313 [inline] kmem_cache_alloc_trace+0x295/0x7d0 mm/slab.c:3549 slab_post_alloc_hook mm/slab.h:586 [inline] slab_alloc mm/slab.c:3320 [inline] kmem_cache_alloc_trace+0x13d/0x7d0 mm/slab.c:3549 lock_is_held include/linux/lockdep.h:406 [inline] rcu_read_lock_held kernel/rcu/update.c:307 [inline] rcu_read_lock_held+0x9c/0xb0 kernel/rcu/update.c:301 rcu_read_lock_held_common+0x130/0x130 kernel/rcu/update.c:275 kmalloc include/linux/slab.h:555 [inline] batadv_mcast_mla_softif_get_ipv4 net/batman-adv/multicast.c:405 [inline] batadv_mcast_mla_softif_get net/batman-adv/multicast.c:532 [inline] __batadv_mcast_mla_update net/batman-adv/multicast.c:911 [inline] batadv_mcast_mla_update+0x1ce2/0x2d20 net/batman-adv/multicast.c:948 lock_acquire+0x1f2/0x8f0 kernel/locking/lockdep.c:4934 batadv_mcast_get_bridge+0x200/0x200 net/batman-adv/multicast.c:95 lock_is_held include/linux/lockdep.h:406 [inline] rcu_read_lock_sched_held+0x9c/0xd0 kernel/rcu/update.c:121 rcu_read_lock_any_held.part.0+0x50/0x50 arch/x86/include/asm/paravirt.h:754 __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:168 [inline] _raw_spin_unlock_irq+0x1f/0x80 kernel/locking/spinlock.c:199 process_one_work+0x965/0x16a0 kernel/workqueue.c:2268 lock_release+0x800/0x800 kernel/locking/lockdep.c:4689 pwq_dec_nr_in_flight+0x310/0x310 kernel/workqueue.c:1198 rwlock_bug.part.0+0x90/0x90 include/linux/sched.h:1329 worker_thread+0x96/0xe20 kernel/workqueue.c:2414 process_one_work+0x16a0/0x16a0 kernel/workqueue.c:2273 kthread+0x388/0x470 kernel/kthread.c:268 kthread_mod_delayed_work+0x1a0/0x1a0 kernel/kthread.c:1090 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:351 rcu: rcu_preempt kthread starved for 10527 jiffies! g61629 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0 rcu: RCU grace-period kthread stack dump: rcu_preempt R running task 28440 10 2 0x80004000 Call Trace: context_switch kernel/sched/core.c:3367 [inline] __schedule+0x937/0x1ff0 kernel/sched/core.c:4083 __sched_text_start+0x8/0x8 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:117 [inline] _raw_spin_lock_irqsave+0x94/0xbf kernel/locking/spinlock.c:159 check_preemption_disabled lib/smp_processor_id.c:52 [inline] debug_smp_processor_id+0x2f/0x185 lib/smp_processor_id.c:57 schedule+0xd0/0x2a0 kernel/sched/core.c:4158 schedule_timeout+0x35c/0x850 kernel/time/timer.c:1898 usleep_range+0x160/0x160 kernel/time/timer.c:2093 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline] _raw_spin_unlock_irqrestore+0x62/0xe0 kernel/locking/spinlock.c:191 __next_timer_interrupt+0x190/0x190 kernel/time/timer.c:1512 prepare_to_swait_exclusive+0x110/0x110 kernel/sched/swait.c:98 rcu_gp_fqs_loop kernel/rcu/tree.c:1674 [inline] rcu_gp_kthread+0x9bf/0x1960 kernel/rcu/tree.c:1836 rcu_barrier+0x4b0/0x4b0 arch/x86/include/asm/paravirt.h:764 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline] _raw_spin_unlock_irqrestore+0x62/0xe0 kernel/locking/spinlock.c:191 __trace_hardirqs_on_caller kernel/locking/lockdep.c:3657 [inline] lockdep_hardirqs_on+0x463/0x620 kernel/locking/lockdep.c:3702 __kthread_parkme+0x13f/0x1e0 kernel/kthread.c:212 rcu_barrier+0x4b0/0x4b0 arch/x86/include/asm/paravirt.h:764 kthread+0x388/0x470 kernel/kthread.c:268 kthread_mod_delayed_work+0x1a0/0x1a0 kernel/kthread.c:1090 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:351