[ 4895.805873] rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: { 3-.... } 4852397 jiffies s: 6353 root: 0x8/.
[ 4895.806485] rcu: blocking rcu_node structures (internal RCU debug):
[ 4895.806817] Sending NMI from CPU 1 to CPUs 3:
[ 4895.807066] NMI backtrace for cpu 3
[ 4895.807071] CPU: 3 PID: 11 Comm: kworker/u8:0 Tainted: G        W          6.8.0-rc2-virtme #1
[ 4895.807073] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[ 4895.807075] Workqueue: netns cleanup_net
[ 4895.807084] RIP: 0010:queued_spin_lock_slowpath+0x36/0x310
[ 4895.807091] 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
[ 4895.807093] RSP: 0018:ffffb565000639d8 EFLAGS: 00000206
[ 4895.807094] RAX: 000000000581b690 RBX: ffff9b6b02518908 RCX: 0000000000000000
[ 4895.807095] RDX: 0000000000000001 RSI: 000000000581b690 RDI: ffff9b6b02518908
[ 4895.807096] RBP: ffff9b6b02518908 R08: 0000000000000001 R09: 0000000000000000
[ 4895.807097] R10: 0000000000000000 R11: ffffb56501677c98 R12: ffff9b6b02518900
[ 4895.807098] R13: 0000000000000000 R14: ffff9b6b02518908 R15: ffff9b6b02518968
[ 4895.807101] FS:  0000000000000000(0000) GS:ffff9b6b3ed80000(0000) knlGS:0000000000000000
[ 4895.807102] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 4895.807103] CR2: 0000560e48897dec CR3: 0000000025460006 CR4: 0000000000770ef0
[ 4895.807104] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 4895.807104] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 4895.807105] PKRU: 55555554
[ 4895.807106] Call Trace:
[ 4895.807109]  <NMI>
[ 4895.807112]  ? nmi_cpu_backtrace+0xa2/0x110
[ 4895.807117]  ? nmi_cpu_backtrace_handler+0x11/0x20
[ 4895.807121]  ? nmi_handle+0xd0/0x270
[ 4895.807124]  ? default_do_nmi+0x41/0x100
[ 4895.807128]  ? exc_nmi+0xf3/0x120
[ 4895.807130]  ? end_repeat_nmi+0xf/0x60
[ 4895.807135]  ? queued_spin_lock_slowpath+0x36/0x310
[ 4895.807137]  ? queued_spin_lock_slowpath+0x36/0x310
[ 4895.807139]  ? queued_spin_lock_slowpath+0x36/0x310
[ 4895.807142]  </NMI>
[ 4895.807142]  <TASK>
[ 4895.807143]  do_raw_spin_lock+0x9b/0xa0
[ 4895.807149]  __mutex_lock+0x205/0x7a0
[ 4895.807153]  ? refcount_dec_and_mutex_lock+0x35/0x80
[ 4895.807158]  ? up_read+0x1b/0x30
[ 4895.807162]  ? tc_setup_cb_destroy+0x116/0x180
[ 4895.807167]  ? refcount_dec_and_mutex_lock+0x35/0x80
[ 4895.807168]  refcount_dec_and_mutex_lock+0x35/0x80
[ 4895.807171]  __tcf_action_put+0x1e/0x70
[ 4895.807177]  tcf_action_destroy+0x31/0x80
[ 4895.807179]  tcf_exts_destroy+0x20/0x40
[ 4895.807181]  __fl_destroy_filter+0x1e/0x80 [cls_flower]
[ 4895.807189]  __fl_delete+0x12d/0x180 [cls_flower]
[ 4895.807194]  fl_destroy+0xbd/0x140 [cls_flower]
[ 4895.807199]  tcf_proto_destroy+0x1f/0xc0
[ 4895.807202]  tcf_chain_flush+0xab/0x170
[ 4895.807205]  __tcf_block_put+0xd2/0x190
[ 4895.807208]  tcf_block_put+0x54/0x80
[ 4895.807212]  prio_destroy+0x1a/0x60 [sch_prio]
[ 4895.807216]  __qdisc_destroy+0x51/0x150
[ 4895.807220]  dev_shutdown+0x8d/0x190
[ 4895.807223]  unregister_netdevice_many_notify+0x23e/0x7f0
[ 4895.807227]  default_device_exit_batch+0x2b3/0x320
[ 4895.807230]  cleanup_net+0x288/0x400
[ 4895.807233]  ? process_one_work+0x16c/0x4b0
[ 4895.807237]  process_one_work+0x1d6/0x4b0
[ 4895.807240]  worker_thread+0x1c1/0x3d0
[ 4895.807243]  ? __pfx_worker_thread+0x10/0x10
[ 4895.807244]  kthread+0xda/0x110
[ 4895.807248]  ? __pfx_kthread+0x10/0x10
[ 4895.807250]  ret_from_fork+0x31/0x50
[ 4895.807254]  ? __pfx_kthread+0x10/0x10
[ 4895.807255]  ret_from_fork_asm+0x1b/0x30
[ 4895.807261]  </TASK>
[ 4906.514866] rcu: INFO: rcu_preempt self-detected stall on CPU
[ 4906.515221] rcu: 	3-....: (4861257 ticks this GP) idle=9224/1/0x4000000000000000 softirq=24881/24890 fqs=1182560
[ 4906.515783] rcu: 	(t=4863140 jiffies g=31081 q=2317 ncpus=4)
[ 4906.516099] CPU: 3 PID: 11 Comm: kworker/u8:0 Tainted: G        W          6.8.0-rc2-virtme #1
[ 4906.516581] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[ 4906.517210] Workqueue: netns cleanup_net
[ 4906.517441] RIP: 0010:queued_spin_lock_slowpath+0x36/0x310
[ 4906.517751] 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
[ 4906.518773] RSP: 0018:ffffb565000639d8 EFLAGS: 00000206
[ 4906.519066] RAX: 000000000581b690 RBX: ffff9b6b02518908 RCX: 0000000000000000
[ 4906.519462] RDX: 0000000000000001 RSI: 000000000581b690 RDI: ffff9b6b02518908
[ 4906.519859] RBP: ffff9b6b02518908 R08: 0000000000000001 R09: 0000000000000000
[ 4906.520258] R10: 0000000000000000 R11: ffffb56501677c98 R12: ffff9b6b02518900
[ 4906.520656] R13: 0000000000000000 R14: ffff9b6b02518908 R15: ffff9b6b02518968
[ 4906.521054] FS:  0000000000000000(0000) GS:ffff9b6b3ed80000(0000) knlGS:0000000000000000
[ 4906.521501] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 4906.521823] CR2: 0000560e48897dec CR3: 0000000025460006 CR4: 0000000000770ef0
[ 4906.522221] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 4906.522615] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 4906.523010] PKRU: 55555554
[ 4906.523167] Call Trace:
[ 4906.523313]  <IRQ>
[ 4906.523435]  ? rcu_dump_cpu_stacks+0xfa/0x180
[ 4906.523689]  ? rcu_sched_clock_irq+0x7bb/0x13d0
[ 4906.523948]  ? _raw_spin_unlock_irqrestore+0x27/0x50
[ 4906.524229]  ? timekeeping_advance+0x3b4/0x5d0
[ 4906.524487]  ? cpuacct_account_field+0x23/0xf0
[ 4906.524741]  ? update_process_times+0x5f/0x90
[ 4906.524990]  ? __pfx_tick_nohz_highres_handler+0x10/0x10
[ 4906.525290]  ? tick_sched_handle+0x33/0x50
[ 4906.525523]  ? tick_nohz_highres_handler+0x71/0x90
[ 4906.525793]  ? __hrtimer_run_queues+0x86/0x390
[ 4906.526045]  ? hrtimer_interrupt+0x100/0x240
[ 4906.526291]  ? __sysvec_apic_timer_interrupt+0x66/0x1a0
[ 4906.526584]  ? sysvec_apic_timer_interrupt+0x73/0x90
[ 4906.526867]  </IRQ>
[ 4906.526992]  <TASK>
[ 4906.527118]  ? asm_sysvec_apic_timer_interrupt+0x1a/0x20
[ 4906.527417]  ? queued_spin_lock_slowpath+0x36/0x310
[ 4906.527693]  do_raw_spin_lock+0x9b/0xa0
[ 4906.527914]  __mutex_lock+0x205/0x7a0
[ 4906.528125]  ? refcount_dec_and_mutex_lock+0x35/0x80
[ 4906.528410]  ? up_read+0x1b/0x30
[ 4906.528596]  ? tc_setup_cb_destroy+0x116/0x180
[ 4906.528850]  ? refcount_dec_and_mutex_lock+0x35/0x80
[ 4906.529128]  refcount_dec_and_mutex_lock+0x35/0x80
[ 4906.529399]  __tcf_action_put+0x1e/0x70
[ 4906.529618]  tcf_action_destroy+0x31/0x80
[ 4906.529844]  tcf_exts_destroy+0x20/0x40
[ 4906.530063]  __fl_destroy_filter+0x1e/0x80 [cls_flower]
[ 4906.530359]  __fl_delete+0x12d/0x180 [cls_flower]
[ 4906.530628]  fl_destroy+0xbd/0x140 [cls_flower]
[ 4906.530886]  tcf_proto_destroy+0x1f/0xc0
[ 4906.531110]  tcf_chain_flush+0xab/0x170
[ 4906.531327]  __tcf_block_put+0xd2/0x190
[ 4906.531546]  tcf_block_put+0x54/0x80
[ 4906.531751]  prio_destroy+0x1a/0x60 [sch_prio]
[ 4906.532005]  __qdisc_destroy+0x51/0x150
[ 4906.532226]  dev_shutdown+0x8d/0x190
[ 4906.532431]  unregister_netdevice_many_notify+0x23e/0x7f0
[ 4906.532733]  default_device_exit_batch+0x2b3/0x320
[ 4906.533003]  cleanup_net+0x288/0x400
[ 4906.533208]  ? process_one_work+0x16c/0x4b0
[ 4906.533446]  process_one_work+0x1d6/0x4b0
[ 4906.533675]  worker_thread+0x1c1/0x3d0
[ 4906.533888]  ? __pfx_worker_thread+0x10/0x10
[ 4906.534131]  kthread+0xda/0x110
[ 4906.534312]  ? __pfx_kthread+0x10/0x10
[ 4906.534526]  ret_from_fork+0x31/0x50
[ 4906.534731]  ? __pfx_kthread+0x10/0x10
[ 4906.534946]  ret_from_fork_asm+0x1b/0x30
[ 4906.535174]  </TASK>
exit