rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P9
	(detected by 1, t=10502 jiffies, g=13901, q=2111 ncpus=2)
task:kworker/u4:0    state:R  running task     stack:0     pid:9     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:605
 check_cpu_stall kernel/rcu/tree_stall.h:777 [inline]
 rcu_pending kernel/rcu/tree.c:3890 [inline]
 rcu_sched_clock_irq+0x195c/0x1c54 kernel/rcu/tree.c:2393
 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:1686 [inline]
 __hrtimer_run_queues+0x484/0xdc0 kernel/time/hrtimer.c:1750
 hrtimer_interrupt+0x2c0/0xb64 kernel/time/hrtimer.c:1812
 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:651 [inline]
 generic_handle_domain_irq+0x7c/0xc4 kernel/irq/irqdesc.c:707
 __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
 check_preemption_disabled+0x14/0x104 lib/smp_processor_id.c:13
 rcu_lockdep_current_cpu_online+0x84/0x218 kernel/rcu/tree.c:768
 rcu_read_lock_held_common kernel/rcu/update.c:112 [inline]
 rcu_read_lock_held+0x20/0x50 kernel/rcu/update.c:309
 xa_entry include/linux/xarray.h:1198 [inline]
 xas_find_marked+0x6b4/0xe84 lib/xarray.c:1368
 xa_find+0x238/0x3c8 lib/xarray.c:2022
 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:159 [inline]
 cleanup_net+0x488/0x994 net/core/net_namespace.c:589
 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