/* watchdog detector functions */
bool is_hardlockup(void)
{
	unsigned long hrint = __this_cpu_read(hrtimer_interrupts);

	if (__this_cpu_read(hrtimer_interrupts_saved) == hrint)
		return true;

	__this_cpu_write(hrtimer_interrupts_saved, hrint);
	return false;
}

-----------------
crash> p hrtimer_interrupts:126
per_cpu(hrtimer_interrupts, 126) = $2 = 1524
crash> p hrtimer_interrupts_saved:126
per_cpu(hrtimer_interrupts_saved, 126) = $3 = 1524
crash> watchdog_thresh
watchdog_thresh = $4 = 10

10s period, not arch timer interrupt occured. 
crash> sys config | grep HZ
CONFIG_NO_HZ_COMMON=y
# CONFIG_HZ_PERIODIC is not set
# CONFIG_NO_HZ_IDLE is not set
CONFIG_NO_HZ_FULL=y
CONFIG_NO_HZ=y
# CONFIG_HZ_100 is not set
CONFIG_HZ_250=y
# CONFIG_HZ_300 is not set
# CONFIG_HZ_1000 is not set
CONFIG_HZ=250

nohz=off is configured,theoretically，every 4ms an timer interrupt occured.


grub info:
BOOT_IMAGE=/vmlinuz-5.10.23-007.ali5000.alios7.aarch64 root=/dev/vda3 ro crashkernel=512M vconsole.font=latarcyrheb-sun16 vconsole.keymap=us biosdevname=0 console=tty0 scsi_mod.scan=sync pci=pcie_bus_perf nohz=off console=ttyS0,115200 virtio_ring.vring_force_dma_api=1 module_blacklist=ast,hns3 ast.ast_modeset=0 cryptomgr.notests cma_pernuma=64M mpam=acpi console=ttyAMA0,115200 initcall_debug pci=earlydump earlycon=pl011,0x2A400000,115200 module_blacklist=acc

crash> p watchdog_hrtimer:126
per_cpu(watchdog_hrtimer, 126) = $5 = {
  node = {
    node = {
      __rb_parent_color = 18446603337777921265,
      rb_right = 0x0,
      rb_left = 0x0
    },
    expires = 6110016166520
  },
  _softexpires = 6110016166520,
  function = 0xffff80001017aa50 <watchdog_timer_fn>,
  base = 0xffff04473bbcc780,
  state = 1 '\001',
  is_rel = 0 '\000',
  is_soft = 0 '\000',
  is_hard = 1 '\001'
}

crash> p tick_cpu_sched:126
per_cpu(tick_cpu_sched, 126) = $1 = {
  sched_timer = {
    node = {
      node = {
        __rb_parent_color = 18446603337117384112,
        rb_right = 0x0,
        rb_left = 0x0
      },
      expires = 6108564000000
    },
    _softexpires = 6108564000000,
    function = 0xffff800010122ec0 <tick_sched_timer>,
    base = 0xffff04473bbcc780,
    state = 1 '\001',
    is_rel = 0 '\000',
    is_soft = 0 '\000',
    is_hard = 1 '\001'
  },
  check_clocks = 0,
  nohz_mode = NOHZ_MODE_INACTIVE,
  inidle = 1,
  tick_stopped = 0,
  idle_active = 1,
  do_timer_last = 0,
  got_idle_tick = 1,
  last_tick = 0,
  next_tick = 0,
  idle_jiffies = 0,
  idle_calls = 0,
  idle_sleeps = 0,
  idle_entrytime = 5012087709249,
  idle_waketime = 0,
  idle_exittime = 0,
  idle_sleeptime = 4936136669951,
  iowait_sleeptime = -1942739704,
  last_jiffies = 0,
  timer_expires = 0,
  timer_expires_base = 0,
  next_timer = 0,
  idle_expires = 0,
  tick_dep_mask = {
    counter = 0
  }
}

(In reply to Liguang from comment #3)
> crash> p tick_cpu_sched:126
> per_cpu(tick_cpu_sched, 126) = $1 = {
>   sched_timer = {
>     node = {
>       node = {
>         __rb_parent_color = 18446603337117384112,
>         rb_right = 0x0,
>         rb_left = 0x0
>       },
>       expires = 6108564000000
>     },
>     _softexpires = 6108564000000,
>     function = 0xffff800010122ec0 <tick_sched_timer>,
>     base = 0xffff04473bbcc780,
>     state = 1 '\001',
>     is_rel = 0 '\000',
>     is_soft = 0 '\000',
>     is_hard = 1 '\001'
>   },
>   check_clocks = 0,
>   nohz_mode = NOHZ_MODE_INACTIVE,
>   inidle = 1,
>   tick_stopped = 0,
>   idle_active = 1,
>   do_timer_last = 0,
>   got_idle_tick = 1,
>   last_tick = 0,
>   next_tick = 0,
>   idle_jiffies = 0,
>   idle_calls = 0,
>   idle_sleeps = 0,
>   idle_entrytime = 5012087709249,
>   idle_waketime = 0,
>   idle_exittime = 0,
>   idle_sleeptime = 4936136669951,
>   iowait_sleeptime = -1942739704,
>   last_jiffies = 0,
>   timer_expires = 0,
>   timer_expires_base = 0,
>   next_timer = 0,
>   idle_expires = 0,
>   tick_dep_mask = {
>     counter = 0
>   }
> }

iowait_sleeptime = -1942739704
why iowait_sleeptime is a negative value?

nohz=off was configured in the startup parameters

crash> tick_nohz_enabled
tick_nohz_enabled = $1 = false
crash> tick_nohz_active
tick_nohz_active = $2 = 0


and current no cpufreq driver was used:

crash> cpufreq_driver
cpufreq_driver = $4 = (struct cpufreq_driver *) 0x0

my machine is 128 core, three cores have the same problem:
crash> p tick_cpu_sched:a | grep iowait_sleeptime | grep "\-"
  iowait_sleeptime = -422390319,
  iowait_sleeptime = -365884628719,
  iowait_sleeptime = -1942739704,

(In reply to Liguang from comment #6)
> my machine is 128 core, three cores have the same problem:
> crash> p tick_cpu_sched:a | grep iowait_sleeptime | grep "\-"
>   iowait_sleeptime = -422390319,
>   iowait_sleeptime = -365884628719,
>   iowait_sleeptime = -1942739704,


crash> p tick_cpu_sched:59
per_cpu(tick_cpu_sched, 59) = $331 = {
  sched_timer = {
    node = {
      node = {
        __rb_parent_color = 18446603337735190528,
        rb_right = 0x0,
        rb_left = 0x0
      },
      expires = 6108564000000
    },
    _softexpires = 6108564000000,
    function = 0xffff800010122ec0 <tick_sched_timer>,
    base = 0xffff00477bb78780,
    state = 1 '\001',
    is_rel = 0 '\000',
    is_soft = 0 '\000',
    is_hard = 1 '\001'
  },
  check_clocks = 0,
  nohz_mode = NOHZ_MODE_INACTIVE,
  inidle = 1,
  tick_stopped = 0,
  idle_active = 1,
  do_timer_last = 0,
  got_idle_tick = 1,
  last_tick = 0,
  next_tick = 0,
  idle_jiffies = 0,
  idle_calls = 0,
  idle_sleeps = 0,
  idle_entrytime = 5009052372788,
  idle_waketime = 0,
  idle_exittime = 0,
  idle_sleeptime = 4925948942621,
  iowait_sleeptime = -422390319,
  last_jiffies = 0,
  timer_expires = 0,
  timer_expires_base = 0,
  next_timer = 0,
  idle_expires = 0,
  tick_dep_mask = {
    counter = 0
  }
}
crash> p tick_cpu_sched:102
per_cpu(tick_cpu_sched, 102) = $332 = {
  sched_timer = {
    node = {
      node = {
        __rb_parent_color = 18446603336923004336,
        rb_right = 0x0,
        rb_left = 0x0
      },
      expires = 6108564000000
    },
    _softexpires = 6108564000000,
    function = 0xffff800010122ec0 <tick_sched_timer>,
    base = 0xffff04473b92c780,
    state = 1 '\001',
    is_rel = 0 '\000',
    is_soft = 0 '\000',
    is_hard = 1 '\001'
  },
  check_clocks = 0,
  nohz_mode = NOHZ_MODE_INACTIVE,
  inidle = 1,
  tick_stopped = 0,
  idle_active = 1,
  do_timer_last = 0,
  got_idle_tick = 1,
  last_tick = 0,
  next_tick = 0,
  idle_jiffies = 0,
  idle_calls = 0,
  idle_sleeps = 0,
  idle_entrytime = 5009052372748,
  idle_waketime = 0,
  idle_exittime = 0,
  idle_sleeptime = 5281350974871,
  iowait_sleeptime = -365884628719,
  last_jiffies = 0,
  timer_expires = 0,
  timer_expires_base = 0,
  next_timer = 0,
  idle_expires = 0,
  tick_dep_mask = {
    counter = 0
  }
}
crash> p tick_cpu_sched:126
per_cpu(tick_cpu_sched, 126) = $333 = {
  sched_timer = {
    node = {
      node = {
        __rb_parent_color = 18446603337117384112,
        rb_right = 0x0,
        rb_left = 0x0
      },
      expires = 6108564000000
    },
    _softexpires = 6108564000000,
    function = 0xffff800010122ec0 <tick_sched_timer>,
    base = 0xffff04473bbcc780,
    state = 1 '\001',
    is_rel = 0 '\000',
    is_soft = 0 '\000',
    is_hard = 1 '\001'
  },
  check_clocks = 0,
  nohz_mode = NOHZ_MODE_INACTIVE,
  inidle = 1,
  tick_stopped = 0,
  idle_active = 1,
  do_timer_last = 0,
  got_idle_tick = 1,
  last_tick = 0,
  next_tick = 0,
  idle_jiffies = 0,
  idle_calls = 0,
  idle_sleeps = 0,
  idle_entrytime = 5012087709249,
  idle_waketime = 0,
  idle_exittime = 0,
  idle_sleeptime = 4936136669951,
  iowait_sleeptime = -1942739704,
  last_jiffies = 0,
  timer_expires = 0,
  timer_expires_base = 0,
  next_timer = 0,
  idle_expires = 0,
  tick_dep_mask = {
    counter = 0
  }
}