rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P6058/1:b..l
	(detected by 0, t=10502 jiffies, g=26481, q=145)
task:kworker/u4:14   state:R  running task     stack:21144 pid: 6058 ppid:     2 flags:0x00004000
Workqueue: netns cleanup_net
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5027 [inline]
 __schedule+0x12c4/0x45b0 kernel/sched/core.c:6373
 preempt_schedule_irq+0xf7/0x1c0 kernel/sched/core.c:6777
 irqentry_exit+0x53/0x80 kernel/entry/common.c:432
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:read_seqbegin+0x1ce/0x250 include/linux/seqlock.h:840
Code: 3c a4 ff 4d 85 ed 75 16 e8 0f 3c a4 ff eb 15 e8 08 3c a4 ff e8 03 2f 58 08 4d 85 ed 74 ea e8 f9 3b a4 ff fb 8b 1d c2 27 85 0a <89> de 83 e6 01 31 ff e8 46 3f a4 ff 89 d8 83 e0 01 75 07 e8 da 3b
RSP: 0018:ffffc900031b7160 EFLAGS: 00000293
RAX: ffffffff81dc1e77 RBX: 0000000000002354 RCX: ffff88801e635940
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc900031b7210 R08: ffffffff81dc1e4d R09: fffffbfff20e241d
R10: 0000000000000000 R11: dffffc0000000001 R12: 1ffff92000636e2c
R13: 0000000000000200 R14: 0000000000000046 R15: dffffc0000000000
 d_alloc_parallel+0x3b8/0x1390 fs/dcache.c:2592
 __lookup_slow+0x111/0x3d0 fs/namei.c:1648
 lookup_one_len+0x187/0x2d0 fs/namei.c:2718
 start_creating+0x17f/0x310 fs/debugfs/inode.c:354
 __debugfs_create_file+0x74/0x500 fs/debugfs/inode.c:399
 nsim_bpf_init+0x1da/0x260 drivers/net/netdevsim/bpf.c:645
 nsim_init_netdevsim drivers/net/netdevsim/netdev.c:311 [inline]
 nsim_create+0x2f4/0x3e0 drivers/net/netdevsim/netdev.c:365
 __nsim_dev_port_add+0x6de/0xb90 drivers/net/netdevsim/dev.c:1312
 nsim_dev_port_add_all drivers/net/netdevsim/dev.c:1372 [inline]
 nsim_dev_reload_create drivers/net/netdevsim/dev.c:1421 [inline]
 nsim_dev_reload_up+0x6c9/0x970 drivers/net/netdevsim/dev.c:910
 devlink_reload+0x31a/0x750 net/core/devlink.c:3970
 devlink_pernet_pre_exit+0x1ca/0x350 net/core/devlink.c:11543
 ops_pre_exit_list net/core/net_namespace.c:162 [inline]
 cleanup_net+0x59c/0xb60 net/core/net_namespace.c:587
 process_one_work+0x8a1/0x10c0 kernel/workqueue.c:2310
 worker_thread+0xaca/0x1280 kernel/workqueue.c:2457
 kthread+0x3f6/0x4f0 kernel/kthread.c:334
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 10466 jiffies! g26481 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=1 timer-softirq=12505
rcu: rcu_preempt kthread starved for 10467 jiffies! g26481 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=1
rcu: 	Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior.
rcu: RCU grace-period kthread stack dump:
task:rcu_preempt     state:I stack:26816 pid:   15 ppid:     2 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5027 [inline]
 __schedule+0x12c4/0x45b0 kernel/sched/core.c:6373
 schedule+0x11b/0x1f0 kernel/sched/core.c:6456
 schedule_timeout+0x1b9/0x300 kernel/time/timer.c:1914
 rcu_gp_fqs_loop+0x2bf/0x1080 kernel/rcu/tree.c:1972
 rcu_gp_kthread+0xa4/0x360 kernel/rcu/tree.c:2145
 kthread+0x3f6/0x4f0 kernel/kthread.c:334
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1 skipped: idling at native_safe_halt arch/x86/include/asm/irqflags.h:51 [inline]
NMI backtrace for cpu 1 skipped: idling at arch_safe_halt arch/x86/include/asm/irqflags.h:89 [inline]
NMI backtrace for cpu 1 skipped: idling at acpi_safe_halt drivers/acpi/processor_idle.c:108 [inline]
NMI backtrace for cpu 1 skipped: idling at acpi_idle_do_entry+0x10f/0x340 drivers/acpi/processor_idle.c:562