root@VM20210305-16 ~]# [  447.000900] tun: Universal TUN/TAP device driver, 1.6
[  447.316570] signal: stress-ng[3973] overflowed sigaltstack
[  449.935907] sched: DL replenish lagged too much
[  452.448001] vsock: module verification failed: signature and/or required key missing - tainting kernel
[  452.789333] NET: Registered protocol family 40
[  463.131848] hrtimer: interrupt took 32658 ns

[root@VM20210305-16 ~]# [  559.644416] rcu: INFO: rcu_sched self-detected stall on CPU
[  559.645619] rcu:   3-...!: (65001 ticks this GP) idle=0a6/1/0x4000000000000000 softirq=119518/119518 fqs=0
[  559.647489]  (t=65004 jiffies g=112557 q=55306)
[  559.648305] rcu: rcu_sched kthread starved for 65004 jiffies! g112557 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=3
[  559.650061] rcu:   Unless rcu_sched kthread gets sufficient CPU time, OOM is now expected behavior.
[  559.651590] rcu: RCU grace-period kthread stack dump:
[  559.652457] task:rcu_sched       state:I stack:28576 pid:   15 ppid:     2 flags:0x00004000
[  559.653894] Call Trace:
[  559.654366]  __schedule+0xada/0x1cc0
[  559.655017]  ? __sched_text_start+0x8/0x8
[  559.655745]  schedule+0xc4/0x280
[  559.656322]  schedule_timeout+0x32e/0x5c0
[  559.657038]  ? usleep_range+0x120/0x120
[  559.657741]  ? lockdep_hardirqs_on_prepare+0x293/0x3e0
[  559.658639]  ? _raw_spin_unlock_irqrestore+0x3d/0x40
[  559.659505]  ? trace_hardirqs_on+0x1c/0x150
[  559.660242]  ? __next_timer_interrupt+0x1e0/0x1e0
[  559.661091]  ? prepare_to_swait_exclusive+0x120/0x120
[  559.662002]  rcu_gp_kthread+0x9f8/0x1e00
[  559.662734]  ? force_qs_rnp+0x5b0/0x5b0
[  559.663419]  ? __kthread_parkme+0x52/0x1a0
[  559.664139]  ? lockdep_hardirqs_on_prepare+0x293/0x3e0
[  559.665027]  ? _raw_spin_unlock_irqrestore+0x3d/0x40
[  559.665892]  ? trace_hardirqs_on+0x1c/0x150
[  559.666664]  ? __kthread_parkme+0xd1/0x1a0
[  559.667372]  ? force_qs_rnp+0x5b0/0x5b0
[  559.668032]  kthread+0x35d/0x430
[  559.668601]  ? __kthread_cancel_work+0x170/0x170
[  559.669399]  ret_from_fork+0x1f/0x30
[  559.670109] NMI backtrace for cpu 3
[  559.670735] CPU: 3 PID: 4452 Comm: stress-ng Kdump: loaded Tainted: G            E     5.10.134-12_rc1.an8.x86_64+debug #1
[  559.672557] Hardware name: Alibaba Cloud Alibaba Cloud ECS, BIOS e623647 04/01/2014
[  559.673831] Call Trace:
[  559.674272]  <IRQ>
[  559.674669]  dump_stack+0x99/0xcf
[  559.675263]  nmi_cpu_backtrace.cold.10+0x13/0xdb
[  559.676067]  ? lapic_can_unplug_cpu+0x80/0x80
[  559.676809]  nmi_trigger_cpumask_backtrace+0x239/0x2a0
[  559.679535]  arch_trigger_cpumask_backtrace+0x15/0x20
[  559.682236]  rcu_dump_cpu_stacks+0x20f/0x26d
[  559.684827]  rcu_sched_clock_irq.cold.118+0x2ce/0x9ee
[  559.687540]  ? __raise_softirq_irqoff+0x1cb/0x260
[  559.690159]  ? tick_sched_do_timer+0x1a0/0x1a0
[  559.692698]  update_process_times+0x7a/0xb0
[  559.695202]  tick_sched_handle.isra.17+0x6a/0x130
[  559.697730]  tick_sched_timer+0xd1/0x100
[  559.700085]  __hrtimer_run_queues+0x4ed/0xb50
[  559.702516]  ? enqueue_hrtimer+0x360/0x360
[  559.704905]  ? ktime_get_update_offsets_now+0xdb/0x2c0
[  559.707453]  hrtimer_interrupt+0x2c7/0x770
[  559.709810]  __sysvec_apic_timer_interrupt+0x13e/0x540
[  559.712252]  asm_call_irq_on_stack+0xf/0x20
[  559.714510]  </IRQ>
[  559.716379]  sysvec_apic_timer_interrupt+0x85/0xa0
[  559.718668]  asm_sysvec_apic_timer_interrupt+0x12/0x20
[  559.720968] RIP: 0010:_raw_spin_unlock_irq+0x2c/0x40
[  559.723256] Code: 44 00 00 53 48 8b 74 24 08 48 89 fb 48 8d 7f 18 e8 09 b0 04 fe 48 89 df e8 01 87 05 fe e8 cc e1 28 fe fb 65 ff 0d a4 65d2 5b <5b> c3 cc cc cc cc 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 0f 1f
[  559.729508] RSP: 0018:ffff888105a67db0 EFLAGS: 00000286
[  559.732062] RAX: 0000000002530a4b RBX: ffff8881284e9540 RCX: ffffffffa23613a4
[  559.734916] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffffa4308c54
[  559.737791] RBP: 0000000200000002 R08: 0000000000000001 R09: 0000000000000001
[  559.740646] R10: ffff8881284e9543 R11: ffffed102509d2a8 R12: 0000000000000000
[  559.743528] R13: ffff888105a58040 R14: 0000000000000000 R15: 0000000000000022
[  559.746449]  ? do_raw_spin_unlock+0x54/0x260
[  559.748916]  ? _raw_spin_unlock_irq+0x24/0x40
[  559.751375]  signal_setup_done+0x1a7/0x230
[  559.753815]  ? force_sigsegv+0xf0/0xf0
[  559.756166]  ? fpu__clear_user_states+0xfd/0x190
[  559.758673]  ? fpu__clear_user_states+0xfd/0x190
[  559.761158]  ? __local_bh_enable_ip+0xa5/0x100
[  559.763630]  ? fpu__clear_user_states+0x113/0x190
[  559.766133]  arch_do_signal+0x3a5/0x6f0
[  559.768521]  ? get_sigframe_size+0x20/0x20
[  559.770979]  exit_to_user_mode_prepare+0x109/0x1b0
[  559.773513]  syscall_exit_to_user_mode+0x3d/0x280
[  559.776032]  entry_SYSCALL_64_after_hwframe+0x61/0xc6
[  559.778611] RIP: 0033:0x667580
[  559.780833] Code: 00 c6 05 72 80 49 00 00 c3 90 48 83 ec 08 be 01 00 00 00 bf 20 cb ce 00 e8 7d 3a da ff 66 2e 0f 1f 84 00 00 00 00 00 0f1f 00 <53> 48 81 ec a0 00 00 00 e8 d3 00 db ff 84 c0 75 37 c6 05 38 80 49
[  559.787417] RSP: 002b:00001486a4743378 EFLAGS: 00000246
[  559.790166] RAX: 0000000000000000 RBX: ffffffffffffff78 RCX: 00001486a38fa628
[  559.793215] RDX: 00001486a4743380 RSI: 00001486a47434b0 RDI: 0000000000000022
[  559.796281] RBP: 0000000000000004 R08: 00007ffc6830b080 R09: 00000000000be5e8
[  559.799370] R10: 0000000000000009 R11: 0000000000000246 R12: 0000000000000001
[  559.802445] R13: 00001486a472b000 R14: 0000000000000000 R15: 0000000000000001