rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P55 (detected by 1, t=10502 jiffies, g=13349, q=2239 ncpus=2) task:kworker/u4:3 state:R running task stack:0 pid:55 ppid:2 flags:0x00000008 Workqueue: netns cleanup_net Call trace: dump_backtrace+0x1c8/0x1f4 arch/arm64/kernel/stacktrace.c:158 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165 sched_show_task+0x438/0x570 kernel/sched/core.c:8942 rcu_print_detail_task_stall_rnp kernel/rcu/tree_stall.h:261 [inline] print_other_cpu_stall+0x1ab8/0x22e0 kernel/rcu/tree_stall.h:606 check_cpu_stall kernel/rcu/tree_stall.h:778 [inline] rcu_pending kernel/rcu/tree.c:3891 [inline] rcu_sched_clock_irq+0x195c/0x1c54 kernel/rcu/tree.c:2394 update_process_times+0x15c/0x1f4 kernel/time/timer.c:1869 tick_sched_handle kernel/time/tick-sched.c:254 [inline] tick_sched_timer+0x340/0x4f8 kernel/time/tick-sched.c:1501 __run_hrtimer kernel/time/hrtimer.c:1689 [inline] __hrtimer_run_queues+0x484/0xdc0 kernel/time/hrtimer.c:1753 hrtimer_interrupt+0x2c0/0xb64 kernel/time/hrtimer.c:1815 timer_handler drivers/clocksource/arm_arch_timer.c:655 [inline] arch_timer_handler_virt+0x74/0x88 drivers/clocksource/arm_arch_timer.c:666 handle_percpu_devid_irq+0x174/0x354 kernel/irq/chip.c:930 generic_handle_irq_desc include/linux/irqdesc.h:158 [inline] handle_irq_desc kernel/irq/irqdesc.c:652 [inline] generic_handle_domain_irq+0x7c/0xc4 kernel/irq/irqdesc.c:708 __gic_handle_irq drivers/irqchip/irq-gic-v3.c:737 [inline] __gic_handle_irq_from_irqson drivers/irqchip/irq-gic-v3.c:788 [inline] gic_handle_irq+0x70/0x1e4 drivers/irqchip/irq-gic-v3.c:832 call_on_irq_stack+0x24/0x4c arch/arm64/kernel/entry.S:893 do_interrupt_handler+0xd4/0x138 arch/arm64/kernel/entry-common.c:274 __el1_irq arch/arm64/kernel/entry-common.c:471 [inline] el1_interrupt+0x34/0x68 arch/arm64/kernel/entry-common.c:486 el1h_64_irq_handler+0x18/0x24 arch/arm64/kernel/entry-common.c:491 el1h_64_irq+0x64/0x68 arch/arm64/kernel/entry.S:581 arch_local_irq_restore arch/arm64/include/asm/irqflags.h:122 [inline] lock_acquire+0x2ac/0x7cc kernel/locking/lockdep.c:5665 rcu_lock_acquire+0x40/0x4c include/linux/rcupdate.h:350 rcu_read_lock include/linux/rcupdate.h:791 [inline] xa_find+0x154/0x3c8 lib/xarray.c:2019 devlinks_xa_find_get+0xfc/0x2dc net/devlink/leftover.c:300 devlinks_xa_find_get_first net/devlink/leftover.c:328 [inline] devlink_pernet_pre_exit+0xc8/0x2fc net/devlink/leftover.c:12518 ops_pre_exit_list net/core/net_namespace.c:162 [inline] cleanup_net+0x488/0x994 net/core/net_namespace.c:592 process_one_work+0x7ac/0x1404 kernel/workqueue.c:2292 worker_thread+0x8e4/0xfec kernel/workqueue.c:2439 kthread+0x250/0x2d8 kernel/kthread.c:376 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:864