exit
[ 4883.516566] rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: { 0-.... } 4850868 jiffies s: 9973 root: 0x1/.
[ 4883.517207] rcu: blocking rcu_node structures (internal RCU debug):
[ 4883.517563] Sending NMI from CPU 3 to CPUs 0:
[ 4883.517823] NMI backtrace for cpu 0
[ 4883.517827] CPU: 0 PID: 11 Comm: kworker/u8:0 Tainted: G        W          6.8.0-rc2-virtme #1
[ 4883.517829] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[ 4883.517831] Workqueue: netns cleanup_net
[ 4883.517842] RIP: 0010:queued_spin_lock_slowpath+0x36/0x310
[ 4883.517847] Code: 54 55 48 89 fd 53 66 90 ba 01 00 00 00 8b 45 00 85 c0 75 14 f0 0f b1 55 00 85 c0 75 f0 5b 5d 41 5c 41 5d c3 cc cc cc cc f3 90 <eb> e1 81 fe 00 01 00 00 74 52 40 30 f6 85 f6 75 75 f0 0f ba 6d 00
[ 4883.517848] RSP: 0018:ffffb84900063a88 EFLAGS: 00000206
[ 4883.517849] RAX: 000000004267a888 RBX: ffff9a79428bce08 RCX: 0000000000000000
[ 4883.517850] RDX: 0000000000000001 RSI: 000000004267a888 RDI: ffff9a79428bce08
[ 4883.517851] RBP: ffff9a79428bce08 R08: 0000000000000001 R09: 0000000000000000
[ 4883.517852] R10: 0000000000000000 R11: ffffffff90b4ac68 R12: ffff9a79428bce00
[ 4883.517853] R13: 0000000000000000 R14: ffff9a79428bce08 R15: ffff9a79428bce68
[ 4883.517856] FS:  0000000000000000(0000) GS:ffff9a797ec00000(0000) knlGS:0000000000000000
[ 4883.517857] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 4883.517858] CR2: 00007fdac291ec08 CR3: 0000000029660001 CR4: 0000000000770ef0
[ 4883.517859] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 4883.517859] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 4883.517860] PKRU: 55555554
[ 4883.517860] Call Trace:
[ 4883.517862]  <NMI>
[ 4883.517864]  ? nmi_cpu_backtrace+0xa2/0x110
[ 4883.517868]  ? nmi_cpu_backtrace_handler+0x11/0x20
[ 4883.517872]  ? nmi_handle+0xd0/0x270
[ 4883.517874]  ? default_do_nmi+0x41/0x100
[ 4883.517877]  ? exc_nmi+0xf3/0x120
[ 4883.517879]  ? end_repeat_nmi+0xf/0x60
[ 4883.517882]  ? queued_spin_lock_slowpath+0x36/0x310
[ 4883.517884]  ? queued_spin_lock_slowpath+0x36/0x310
[ 4883.517886]  ? queued_spin_lock_slowpath+0x36/0x310
[ 4883.517888]  </NMI>
[ 4883.517889]  <TASK>
[ 4883.517890]  do_raw_spin_lock+0x9b/0xa0
[ 4883.517893]  __mutex_lock+0x205/0x7a0
[ 4883.517896]  ? refcount_dec_and_mutex_lock+0x35/0x80
[ 4883.517901]  ? refcount_dec_and_mutex_lock+0x35/0x80
[ 4883.517902]  refcount_dec_and_mutex_lock+0x35/0x80
[ 4883.517904]  __tcf_action_put+0x1e/0x70
[ 4883.517908]  tcf_action_destroy+0x31/0x80
[ 4883.517910]  tcf_exts_destroy+0x20/0x40
[ 4883.517913]  __basic_delete_filter+0x12/0x70 [cls_basic]
[ 4883.517917]  basic_destroy+0x135/0x1b0 [cls_basic]
[ 4883.517921]  tcf_proto_destroy+0x1f/0xc0
[ 4883.517924]  tcf_chain_flush+0xab/0x170
[ 4883.517926]  __tcf_block_put+0xd2/0x190
[ 4883.517929]  ingress_destroy+0x88/0x1c0 [sch_ingress]
[ 4883.517934]  __qdisc_destroy+0x51/0x150
[ 4883.517937]  dev_shutdown+0x78/0x190
[ 4883.517940]  unregister_netdevice_many_notify+0x23e/0x7f0
[ 4883.517943]  default_device_exit_batch+0x2b3/0x320
[ 4883.517946]  cleanup_net+0x288/0x400
[ 4883.517948]  ? process_one_work+0x16c/0x4b0
[ 4883.517951]  process_one_work+0x1d6/0x4b0
[ 4883.517954]  worker_thread+0x1c1/0x3d0
[ 4883.517956]  ? __pfx_worker_thread+0x10/0x10
[ 4883.517958]  kthread+0xda/0x110
[ 4883.517960]  ? __pfx_kthread+0x10/0x10
[ 4883.517962]  ret_from_fork+0x31/0x50
[ 4883.517966]  ? __pfx_kthread+0x10/0x10
[ 4883.517967]  ret_from_fork_asm+0x1b/0x30
[ 4883.517972]  </TASK>