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=10503 jiffies, g=115401, q=30332 ncpus=2)
task:kworker/u4:4    state:R  running task     stack:23976 pid:55    ppid:2      flags:0x00004000
Workqueue: netns cleanup_net
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5209 [inline]
 __schedule+0xae9/0x53f0 kernel/sched/core.c:6521
 preempt_schedule_irq+0x52/0xa0 kernel/sched/core.c:6833
 irqentry_exit+0x35/0x80 kernel/entry/common.c:432
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:649
RIP: 0010:lock_is_held_type+0x103/0x140 kernel/locking/lockdep.c:5716
Code: 00 00 b8 ff ff ff ff 65 0f c1 05 60 93 15 76 83 f8 01 75 29 9c 58 f6 c4 02 75 3d 48 f7 04 24 00 02 00 00 74 01 fb 48 83 c4 08 <44> 89 e8 5b 5d 41 5c 41 5d 41 5e 41 5f c3 45 31 ed eb b9 0f 0b 48
RSP: 0018:ffffc9000201f9e8 EFLAGS: 00000286
RAX: 0000000000000046 RBX: 0000000000000005 RCX: 0000000000000001
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffffff8dedf658 R08: 0000000000000004 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff888018342040
R13: 0000000000000000 R14: 00000000ffffffff R15: ffff888018342b30
 lock_is_held include/linux/lockdep.h:283 [inline]
 xa_entry include/linux/xarray.h:1198 [inline]
 xas_find_marked+0x2fd/0x10b0 lib/xarray.c:1368
 xa_find+0x13d/0x330 lib/xarray.c:2022
 devlinks_xa_find_get.constprop.0+0x93/0x260 net/core/devlink.c:300
 devlinks_xa_find_get_first net/core/devlink.c:328 [inline]
 devlink_pernet_pre_exit+0x8a/0x1d0 net/core/devlink.c:12507
 ops_pre_exit_list net/core/net_namespace.c:159 [inline]
 cleanup_net+0x455/0xb00 net/core/net_namespace.c:589
 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:306
 </TASK>