rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P1027/2:b..l
	(detected by 1, t=10503 jiffies, g=94985, q=31551 ncpus=2)
task:kworker/u4:5    state:R  running task     stack:21768 pid:1027  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_start+0x19d/0x730 lib/xarray.c:193
Code: c4 f7 49 81 fc 00 10 00 00 76 94 e8 5d e7 c4 f7 49 8d 7c 24 fe 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 0f b6 04 02 <84> c0 74 06 0f 8e b3 04 00 00 45 0f b6 74 24 fe bf 3f 00 00 00 44
RSP: 0018:ffffc90004df7a50 EFLAGS: 00000a02
RAX: 0000000000000000 RBX: ffffc90004df7ab8 RCX: 0000000000000000
RDX: 1ffff1100e231470 RSI: ffffffff89bb8bb3 RDI: ffff88807118a380
RBP: 0000000000000000 R08: 0000000000000007 R09: 0000000000001000
R10: ffff88807118a382 R11: 0000000000000000 R12: ffff88807118a382
R13: ffffc90004df7ad0 R14: 0000000000000002 R15: 1ffff920009bef53
 xa_get_mark+0x10a/0x490 lib/xarray.c:1946
 devlinks_xa_find_get.constprop.0+0xc3/0x260 net/core/devlink.c:314
 devlinks_xa_find_get_first net/core/devlink.c:334 [inline]
 devlink_pernet_pre_exit+0x8a/0x1d0 net/core/devlink.c:12992
 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>