rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P5390/2:b..l
	(detected by 0, t=10502 jiffies, g=10541, q=26005 ncpus=2)
task:kworker/u4:20   state:R  running task     stack:24848 pid:5390  ppid:2      flags:0x00004000
Workqueue: netns cleanup_net
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5293 [inline]
 __schedule+0xb8a/0x5450 kernel/sched/core.c:6606
 preempt_schedule_irq+0x52/0xa0 kernel/sched/core.c:6918
 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+0x10a/0x10b0 lib/xarray.c:1349
Code: e1 07 48 c1 ea 03 0f b6 04 02 38 c8 7f 08 84 c0 0f 85 e5 0e 00 00 44 0f b6 63 12 41 bf 01 00 00 00 e8 ba 53 c4 f7 8b 44 24 3c <48> bd 00 00 00 00 00 fc ff df 48 8d 04 c5 28 02 00 00 48 89 44 24
RSP: 0018:ffffc90003d7fa20 EFLAGS: 00000293
RAX: 0000000000000001 RBX: ffffc90003d7fab8 RCX: 0000000000000000
RDX: ffff88803b5fa200 RSI: ffffffff89bc2ec6 RDI: 0000000000000006
RBP: 0000000000000000 R08: 0000000000000006 R09: ffffffffffffffff
R10: 0000000000000000 R11: 0000000000094001 R12: 0000000000000000
R13: ffff88806fdd5b40 R14: ffffffffffffffff R15: 0000000000000000
 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>