rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P8/2:b..l
	(detected by 1, t=10503 jiffies, g=51841, q=31131 ncpus=2)
task:kworker/u4:0    state:R  running task     stack:25792 pid:8     ppid:2      flags:0x00004000
Workqueue: netns cleanup_net
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5244 [inline]
 __schedule+0xb8a/0x5450 kernel/sched/core.c:6555
 preempt_schedule_irq+0x52/0xa0 kernel/sched/core.c:6867
 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:xas_find_marked+0xbbe/0x10b0 lib/xarray.c:1334
Code: ff 4c 89 fe e8 a3 46 c4 f7 4c 39 fd 0f 87 ae fb ff ff e8 45 4a c4 f7 48 8b 54 24 08 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 <80> 3c 02 00 0f 85 39 04 00 00 4c 89 ea 4c 89 6b 18 48 b8 00 00 00
RSP: 0018:ffffc900002efa20 EFLAGS: 00000a06
RAX: dffffc0000000000 RBX: ffffc900002efab8 RCX: 0000000000000000
RDX: 1ffff9200005df5a RSI: ffffffff89bc296b RDI: 0000000000000006
RBP: 0000000000000000 R08: 0000000000000006 R09: 0000000000000000
R10: 000000000000003f R11: 0000000000000000 R12: 0000000000000000
R13: ffff88807095f880 R14: ffffffffffffffff R15: 000000000000003f
 xa_find+0x13d/0x330 lib/xarray.c:2022
 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>