rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P7940
	(detected by 0, t=10502 jiffies, g=124173, q=11481 ncpus=2)
task:kworker/u4:7    state:R  running task     stack:21688 pid: 7940 ppid:     2 flags:0x00004000
Workqueue: netns cleanup_net
Call Trace:
 <IRQ>
 sched_show_task+0x49b/0x640 kernel/sched/core.c:8870
 rcu_print_detail_task_stall_rnp kernel/rcu/tree_stall.h:255 [inline]
 print_other_cpu_stall+0x12d9/0x1690 kernel/rcu/tree_stall.h:600
 check_cpu_stall kernel/rcu/tree_stall.h:762 [inline]
 rcu_pending kernel/rcu/tree.c:3660 [inline]
 rcu_sched_clock_irq+0xa17/0x1950 kernel/rcu/tree.c:2342
 update_process_times+0x148/0x1b0 kernel/time/timer.c:1839
 tick_sched_handle kernel/time/tick-sched.c:243 [inline]
 tick_sched_timer+0x377/0x540 kernel/time/tick-sched.c:1480
 __run_hrtimer kernel/time/hrtimer.c:1685 [inline]
 __hrtimer_run_queues+0x4cb/0xa60 kernel/time/hrtimer.c:1749
 hrtimer_interrupt+0x3a6/0xfd0 kernel/time/hrtimer.c:1811
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1095 [inline]
 __sysvec_apic_timer_interrupt+0xf9/0x280 arch/x86/kernel/apic/apic.c:1112
 sysvec_apic_timer_interrupt+0x8c/0xb0 arch/x86/kernel/apic/apic.c:1106
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:649
RIP: 0010:lock_is_held_type+0x144/0x190
Code: 75 40 48 c7 04 24 00 00 00 00 9c 8f 04 24 f7 04 24 00 02 00 00 75 46 41 f7 c4 00 02 00 00 74 01 fb 65 48 8b 04 25 28 00 00 00 <48> 3b 44 24 08 75 3c 89 e8 48 83 c4 10 5b 41 5c 41 5d 41 5e 41 5f
RSP: 0018:ffffc90005607890 EFLAGS: 00000206
RAX: 221261bde92a0a00 RBX: 0000000000000005 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: ffffffff8aad88c0 RDI: ffffffff8b0a6780
RBP: 0000000000000000 R08: ffffffff846c5d56 R09: fffffbfff1ff4609
R10: fffffbfff1ff4609 R11: 1ffffffff1ff4608 R12: 0000000000000246
R13: ffff88802f703b00 R14: 00000000ffffffff R15: ffffffff8de02038
 lock_is_held include/linux/lockdep.h:283 [inline]
 xa_entry include/linux/xarray.h:1198 [inline]
 xas_descend+0xd5/0x400 lib/xarray.c:204
 xa_get_mark+0x382/0x590 lib/xarray.c:1950
 devlinks_xa_find_get+0xe8/0x270 net/core/devlink.c:308
 devlinks_xa_find_get_first net/core/devlink.c:328 [inline]
 devlink_pernet_pre_exit+0xd5/0x2f0 net/core/devlink.c:12430
 ops_pre_exit_list net/core/net_namespace.c:152 [inline]
 cleanup_net+0x608/0xc50 net/core/net_namespace.c:582
 process_one_work+0x81c/0xd10 kernel/workqueue.c:2289
 worker_thread+0xb14/0x1330 kernel/workqueue.c:2436
 kthread+0x266/0x300 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306
 </TASK>