[ 6180.988541] rcu: INFO: rcu_preempt self-detected stall on CPU [ 6180.988877] rcu: 1-....: (4549913 ticks this GP) idle=a76c/1/0x4000000000000000 softirq=444646/444646 fqs=1044699 [ 6180.989396] rcu: (t=4551282 jiffies g=835033 q=128 ncpus=4) [ 6180.989690] CPU: 1 PID: 11 Comm: kworker/u8:0 Tainted: G W 6.8.0-rc2-virtme #1 [ 6180.990121] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014 [ 6180.990694] Workqueue: netns cleanup_net [ 6180.990907] RIP: 0010:queued_spin_lock_slowpath+0x36/0x310 [ 6180.991190] 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 e1 81 fe 00 01 00 00 74 52 40 30 f6 85 f6 75 75 f0 0f ba 6d 00 [ 6180.992110] RSP: 0018:ffffae5a40063a78 EFLAGS: 00000202 [ 6180.992378] RAX: 0000000001273d08 RBX: ffffa05901273d08 RCX: 0000000000000000 [ 6180.992742] RDX: 0000000000000001 RSI: 0000000001273d08 RDI: ffffa05901273d08 [ 6180.993099] RBP: ffffa05901273d08 R08: 0000000000000001 R09: 0000000000000000 [ 6180.993458] R10: 0000000000000000 R11: 00000000026a4bb4 R12: ffffa05901273d00 [ 6180.993820] R13: 0000000000000000 R14: ffffa05901273d08 R15: ffffa05901273d68 [ 6180.994181] FS: 0000000000000000(0000) GS:ffffa0593ec80000(0000) knlGS:0000000000000000 [ 6180.994591] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 6180.994880] CR2: 00007f731ddaa400 CR3: 0000000003562001 CR4: 0000000000770ef0 [ 6180.995240] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 6180.995601] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 6180.995960] PKRU: 55555554 [ 6180.996103] Call Trace: [ 6180.996235] [ 6180.996345] ? rcu_dump_cpu_stacks+0xfa/0x180 [ 6180.996580] ? rcu_sched_clock_irq+0x7bb/0x13d0 [ 6180.996822] ? cpuacct_charge+0x3e/0x120 [ 6180.997026] ? lock_release+0x1d3/0x270 [ 6180.997224] ? lock_acquire+0x179/0x2b0 [ 6180.997421] ? cpuacct_account_field+0x23/0xf0 [ 6180.997657] ? update_process_times+0x5f/0x90 [ 6180.997884] ? __pfx_tick_nohz_highres_handler+0x10/0x10 [ 6180.998155] ? tick_sched_handle+0x33/0x50 [ 6180.998365] ? tick_nohz_highres_handler+0x71/0x90 [ 6180.998617] ? __hrtimer_run_queues+0x86/0x390 [ 6180.998848] ? hrtimer_interrupt+0x100/0x240 [ 6180.999071] ? __sysvec_apic_timer_interrupt+0x66/0x1a0 [ 6180.999338] ? sysvec_apic_timer_interrupt+0x73/0x90 [ 6180.999596] [ 6180.999710] [ 6180.999823] ? asm_sysvec_apic_timer_interrupt+0x1a/0x20 [ 6181.000094] ? queued_spin_lock_slowpath+0x36/0x310 [ 6181.000345] do_raw_spin_lock+0x9b/0xa0 [ 6181.000549] __mutex_lock+0x205/0x7a0 [ 6181.000739] ? refcount_dec_and_mutex_lock+0x35/0x80 [ 6181.000993] ? up_read+0x1b/0x30 [ 6181.001164] ? tc_setup_cb_destroy+0x116/0x180 [ 6181.001398] ? refcount_dec_and_mutex_lock+0x35/0x80 [ 6181.001655] refcount_dec_and_mutex_lock+0x35/0x80 [ 6181.001902] __tcf_action_put+0x1e/0x70 [ 6181.002103] tcf_action_destroy+0x31/0x80 [ 6181.002310] tcf_exts_destroy+0x20/0x40 [ 6181.002507] __fl_destroy_filter+0x1e/0x80 [cls_flower] [ 6181.002783] __fl_delete+0x12d/0x180 [cls_flower] [ 6181.003026] fl_destroy+0xbd/0x140 [cls_flower] [ 6181.003262] tcf_proto_destroy+0x1f/0xc0 [ 6181.003466] tcf_chain_flush+0xab/0x170 [ 6181.003670] __tcf_block_put+0xd2/0x190 [ 6181.003869] clsact_destroy+0xa0/0x380 [sch_ingress] [ 6181.004126] __qdisc_destroy+0x51/0x150 [ 6181.004326] dev_shutdown+0x78/0x190 [ 6181.004512] unregister_netdevice_many_notify+0x226/0x7e0 [ 6181.004792] cleanup_net+0x268/0x400 [ 6181.004980] ? process_one_work+0x16c/0x4b0 [ 6181.005198] process_one_work+0x1d6/0x4b0 [ 6181.005405] worker_thread+0x1c1/0x3d0 [ 6181.005604] ? __pfx_worker_thread+0x10/0x10 [ 6181.005827] kthread+0xda/0x110 [ 6181.005994] ? __pfx_kthread+0x10/0x10 [ 6181.006188] ret_from_fork+0x31/0x50 [ 6181.006377] ? __pfx_kthread+0x10/0x10 [ 6181.006575] ret_from_fork_asm+0x1b/0x30 [ 6181.006793] exit