rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P11630
	(detected by 0, t=10502 jiffies, g=43605, q=34713 ncpus=2)
task:kworker/u4:23   state:R  running task     stack:26312 pid:11630 ppid:2      flags:0x00004000
Workqueue: netns cleanup_net
Call Trace:
 <IRQ>
 sched_show_task kernel/sched/core.c:9024 [inline]
 sched_show_task+0x450/0x5c0 kernel/sched/core.c:8998
 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:__rcu_read_unlock+0xed/0x5b0 kernel/rcu/tree_plugin.h:427
Code: 00 85 c0 75 54 65 48 8b 1c 25 00 ac 03 00 48 8d bb 3c 04 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 0f b6 14 02 <48> 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 5e 01 00 00 8b
RSP: 0018:ffffc9000395fa68 EFLAGS: 00000213
RAX: dffffc0000000000 RBX: ffff88801fa157c0 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff89bd2ad3 RDI: ffff88801fa15bfc
RBP: ffff88801fa157c0 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: ffff88801fa157c0
R13: ffffc9000395fbf0 R14: ffffffffffffffff R15: ffffc9000395fab8
 rcu_read_unlock include/linux/rcupdate.h:796 [inline]
 xa_find+0x188/0x330 lib/xarray.c:2026
 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>