rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P5303
	(detected by 1, t=10503 jiffies, g=113789, q=12728 ncpus=2)
task:kworker/u4:11   state:R  running task     stack:23640 pid:5303  ppid:2      flags:0x00004008
Workqueue: netns cleanup_net
Call Trace:
 <IRQ>
 sched_show_task kernel/sched/core.c:9018 [inline]
 sched_show_task+0x450/0x5c0 kernel/sched/core.c:8992
 rcu_print_detail_task_stall_rnp kernel/rcu/tree_stall.h:255 [inline]
 print_other_cpu_stall kernel/rcu/tree_stall.h:599 [inline]
 check_cpu_stall kernel/rcu/tree_stall.h:761 [inline]
 rcu_pending kernel/rcu/tree.c:3858 [inline]
 rcu_sched_clock_irq+0x21d1/0x2470 kernel/rcu/tree.c:2343
 update_process_times+0x11e/0x1a0 kernel/time/timer.c:2071
 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:243
 tick_sched_timer+0xf2/0x120 kernel/time/tick-sched.c:1480
 __run_hrtimer kernel/time/hrtimer.c:1685 [inline]
 __hrtimer_run_queues+0x1c6/0xfb0 kernel/time/hrtimer.c:1749
 hrtimer_interrupt+0x320/0x790 kernel/time/hrtimer.c:1811
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1096 [inline]
 __sysvec_apic_timer_interrupt+0x180/0x640 arch/x86/kernel/apic/apic.c:1113
 sysvec_apic_timer_interrupt+0x92/0xc0 arch/x86/kernel/apic/apic.c:1107
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:649
RIP: 0010:lock_acquire+0x227/0x630 kernel/locking/lockdep.c:5636
Code: 7f 9e 7e 83 f8 01 0f 85 3a 03 00 00 9c 58 f6 c4 02 0f 85 25 03 00 00 48 83 7c 24 08 00 74 01 fb 48 b8 00 00 00 00 00 fc ff df <48> 01 c3 48 c7 03 00 00 00 00 48 c7 43 08 00 00 00 00 48 8b 84 24
RSP: 0018:ffffc9000583f9a0 EFLAGS: 00000206
RAX: dffffc0000000000 RBX: 1ffff92000b07f37 RCX: 3b56a09c5c4c2b21
RDX: 1ffff11005d15c3e RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: ffffffff91339ac7
R10: fffffbfff2267358 R11: 0000000000094001 R12: 0000000000000002
R13: 0000000000000000 R14: ffffffff8c791b00 R15: 0000000000000000
 rcu_lock_acquire include/linux/rcupdate.h:325 [inline]
 rcu_read_lock include/linux/rcupdate.h:764 [inline]
 xa_find+0xf1/0x330 lib/xarray.c:2019
 devlinks_xa_find_get.constprop.0+0x93/0x260 net/core/devlink.c:306
 devlinks_xa_find_get_first net/core/devlink.c:334 [inline]
 devlink_pernet_pre_exit+0x8a/0x1d0 net/core/devlink.c:12997
 ops_pre_exit_list net/core/net_namespace.c:159 [inline]
 cleanup_net+0x455/0xb10 net/core/net_namespace.c:594
 process_one_work+0x9bf/0x1710 kernel/workqueue.c:2289
 worker_thread+0x669/0x1090 kernel/workqueue.c:2436
 kthread+0x2e8/0x3a0 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
 </TASK>