[ 4863.040619] rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: { 3-.... } 4852041 jiffies s: 4157 root: 0x8/.
[ 4863.041216] rcu: blocking rcu_node structures (internal RCU debug):
[ 4863.041544] Sending NMI from CPU 2 to CPUs 3:
[ 4863.041796] NMI backtrace for cpu 3
[ 4863.041801] CPU: 3 PID: 11 Comm: kworker/u8:0 Tainted: G        W          6.8.0-rc2-virtme #1
[ 4863.041803] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[ 4863.041806] Workqueue: netns cleanup_net
[ 4863.041813] RIP: 0010:queued_spin_lock_slowpath+0x36/0x310
[ 4863.041819] 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
[ 4863.041821] RSP: 0018:ffff9e38400639d8 EFLAGS: 00000282
[ 4863.041822] RAX: 0000000082fc8b08 RBX: ffff906783ad2708 RCX: 0000000000000000
[ 4863.041824] RDX: 0000000000000001 RSI: 0000000082fc8b08 RDI: ffff906783ad2708
[ 4863.041825] RBP: ffff906783ad2708 R08: 0000000000000001 R09: 0000000000000000
[ 4863.041826] R10: 0000000000000000 R11: ffff9e3840317cc8 R12: ffff906783ad2700
[ 4863.041827] R13: 0000000000000000 R14: ffff906783ad2708 R15: ffff906783ad2768
[ 4863.041830] FS:  0000000000000000(0000) GS:ffff9067bed80000(0000) knlGS:0000000000000000
[ 4863.041831] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 4863.041832] CR2: 00007f3d53919a30 CR3: 0000000039660001 CR4: 0000000000770ef0
[ 4863.041833] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 4863.041833] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 4863.041834] PKRU: 55555554
[ 4863.041834] Call Trace:
[ 4863.041837]  <NMI>
[ 4863.041840]  ? nmi_cpu_backtrace+0xa2/0x110
[ 4863.041845]  ? nmi_cpu_backtrace_handler+0x11/0x20
[ 4863.041849]  ? nmi_handle+0xd0/0x270
[ 4863.041852]  ? default_do_nmi+0x41/0x100
[ 4863.041857]  ? exc_nmi+0xf3/0x120
[ 4863.041859]  ? end_repeat_nmi+0xf/0x60
[ 4863.041864]  ? queued_spin_lock_slowpath+0x36/0x310
[ 4863.041866]  ? queued_spin_lock_slowpath+0x36/0x310
[ 4863.041868]  ? queued_spin_lock_slowpath+0x36/0x310
[ 4863.041871]  </NMI>
[ 4863.041871]  <TASK>
[ 4863.041872]  do_raw_spin_lock+0x9b/0xa0
[ 4863.041876]  __mutex_lock+0x205/0x7a0
[ 4863.041878]  ? refcount_dec_and_mutex_lock+0x35/0x80
[ 4863.041883]  ? up_read+0x1b/0x30
[ 4863.041887]  ? tc_setup_cb_destroy+0x116/0x180
[ 4863.041891]  ? refcount_dec_and_mutex_lock+0x35/0x80
[ 4863.041893]  refcount_dec_and_mutex_lock+0x35/0x80
[ 4863.041895]  __tcf_action_put+0x1e/0x70
[ 4863.041900]  tcf_action_destroy+0x31/0x80
[ 4863.041903]  tcf_exts_destroy+0x20/0x40
[ 4863.041905]  __fl_destroy_filter+0x1e/0x80 [cls_flower]
[ 4863.041912]  __fl_delete+0x12d/0x180 [cls_flower]
[ 4863.041918]  fl_destroy+0xbd/0x140 [cls_flower]
[ 4863.041924]  tcf_proto_destroy+0x1f/0xc0
[ 4863.041927]  tcf_chain_flush+0xab/0x170
[ 4863.041928]  __tcf_block_put+0xd2/0x190
[ 4863.041930]  tcf_block_put+0x54/0x80
[ 4863.041933]  prio_destroy+0x1a/0x60 [sch_prio]
[ 4863.041937]  __qdisc_destroy+0x51/0x150
[ 4863.041942]  dev_shutdown+0x8d/0x190
[ 4863.041945]  unregister_netdevice_many_notify+0x226/0x7e0
[ 4863.041949]  default_device_exit_batch+0x2b3/0x320
[ 4863.041952]  cleanup_net+0x288/0x400
[ 4863.041955]  ? process_one_work+0x16c/0x4b0
[ 4863.041957]  process_one_work+0x1d6/0x4b0
[ 4863.041960]  worker_thread+0x1c1/0x3d0
[ 4863.041963]  ? __pfx_worker_thread+0x10/0x10
[ 4863.041965]  kthread+0xda/0x110
[ 4863.041968]  ? __pfx_kthread+0x10/0x10
[ 4863.041969]  ret_from_fork+0x31/0x50
[ 4863.041973]  ? __pfx_kthread+0x10/0x10
[ 4863.041975]  ret_from_fork_asm+0x1b/0x30
[ 4863.041980]  </TASK>
[ 4874.390609] rcu: INFO: rcu_preempt self-detected stall on CPU
[ 4874.390942] rcu: 	3-....: (4861547 ticks this GP) idle=bd64/1/0x4000000000000000 softirq=5764/5764 fqs=1121228
[ 4874.391465] rcu: 	(t=4863421 jiffies g=7477 q=1801 ncpus=4)
[ 4874.391760] CPU: 3 PID: 11 Comm: kworker/u8:0 Tainted: G        W          6.8.0-rc2-virtme #1
[ 4874.392214] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[ 4874.392820] Workqueue: netns cleanup_net
[ 4874.393037] RIP: 0010:queued_spin_lock_slowpath+0x36/0x310
[ 4874.393332] 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
[ 4874.394298] RSP: 0018:ffff9e38400639d8 EFLAGS: 00000282
[ 4874.394574] RAX: 0000000082fc8b08 RBX: ffff906783ad2708 RCX: 0000000000000000
[ 4874.394953] RDX: 0000000000000001 RSI: 0000000082fc8b08 RDI: ffff906783ad2708
[ 4874.395326] RBP: ffff906783ad2708 R08: 0000000000000001 R09: 0000000000000000
[ 4874.395702] R10: 0000000000000000 R11: ffff9e3840317cc8 R12: ffff906783ad2700
[ 4874.396076] R13: 0000000000000000 R14: ffff906783ad2708 R15: ffff906783ad2768
[ 4874.396454] FS:  0000000000000000(0000) GS:ffff9067bed80000(0000) knlGS:0000000000000000
[ 4874.396876] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 4874.397182] CR2: 00007f3d53919a30 CR3: 0000000039660001 CR4: 0000000000770ef0
[ 4874.397558] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 4874.397933] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 4874.398306] PKRU: 55555554
[ 4874.398455] Call Trace:
[ 4874.398592]  <IRQ>
[ 4874.398708]  ? rcu_dump_cpu_stacks+0xfa/0x180
[ 4874.398949]  ? rcu_sched_clock_irq+0x7bb/0x13d0
[ 4874.399193]  ? cpuacct_charge+0x3e/0x120
[ 4874.399405]  ? lock_release+0x1d3/0x270
[ 4874.399614]  ? lock_acquire+0x179/0x2b0
[ 4874.399824]  ? cpuacct_account_field+0x23/0xf0
[ 4874.400064]  ? update_process_times+0x5f/0x90
[ 4874.400301]  ? __pfx_tick_nohz_highres_handler+0x10/0x10
[ 4874.400584]  ? tick_sched_handle+0x33/0x50
[ 4874.400805]  ? tick_nohz_highres_handler+0x71/0x90
[ 4874.401061]  ? __hrtimer_run_queues+0x86/0x390
[ 4874.401303]  ? hrtimer_interrupt+0x100/0x240
[ 4874.401535]  ? __sysvec_apic_timer_interrupt+0x66/0x1a0
[ 4874.401814]  ? sysvec_apic_timer_interrupt+0x73/0x90
[ 4874.402079]  </IRQ>
[ 4874.402197]  <TASK>
[ 4874.402321]  ? asm_sysvec_apic_timer_interrupt+0x1a/0x20
[ 4874.402607]  ? queued_spin_lock_slowpath+0x36/0x310
[ 4874.402869]  do_raw_spin_lock+0x9b/0xa0
[ 4874.403076]  __mutex_lock+0x205/0x7a0
[ 4874.403275]  ? refcount_dec_and_mutex_lock+0x35/0x80
[ 4874.403542]  ? up_read+0x1b/0x30
[ 4874.403722]  ? tc_setup_cb_destroy+0x116/0x180
[ 4874.403964]  ? refcount_dec_and_mutex_lock+0x35/0x80
[ 4874.404228]  refcount_dec_and_mutex_lock+0x35/0x80
[ 4874.404485]  __tcf_action_put+0x1e/0x70
[ 4874.404695]  tcf_action_destroy+0x31/0x80
[ 4874.404910]  tcf_exts_destroy+0x20/0x40
[ 4874.405118]  __fl_destroy_filter+0x1e/0x80 [cls_flower]
[ 4874.405402]  __fl_delete+0x12d/0x180 [cls_flower]
[ 4874.405658]  fl_destroy+0xbd/0x140 [cls_flower]
[ 4874.405904]  tcf_proto_destroy+0x1f/0xc0
[ 4874.406119]  tcf_chain_flush+0xab/0x170
[ 4874.406326]  __tcf_block_put+0xd2/0x190
[ 4874.406533]  tcf_block_put+0x54/0x80
[ 4874.406729]  prio_destroy+0x1a/0x60 [sch_prio]
[ 4874.406973]  __qdisc_destroy+0x51/0x150
[ 4874.407182]  dev_shutdown+0x8d/0x190
[ 4874.407378]  unregister_netdevice_many_notify+0x226/0x7e0
[ 4874.407666]  default_device_exit_batch+0x2b3/0x320
[ 4874.407924]  cleanup_net+0x288/0x400
[ 4874.408120]  ? process_one_work+0x16c/0x4b0
[ 4874.408351]  process_one_work+0x1d6/0x4b0
[ 4874.408568]  worker_thread+0x1c1/0x3d0
[ 4874.408772]  ? __pfx_worker_thread+0x10/0x10
[ 4874.409004]  kthread+0xda/0x110
[ 4874.409177]  ? __pfx_kthread+0x10/0x10
[ 4874.409381]  ret_from_fork+0x31/0x50
[ 4874.409579]  ? __pfx_kthread+0x10/0x10
[ 4874.409784]  ret_from_fork_asm+0x1b/0x30
[ 4874.409999]  </TASK>
exit