At my wits' end re: random freezing

U

unclaimed6445

New Member
Jan 18, 2025
2
0
1
I installed Proxmox VE 8.3.2 on my old Dell Inspiron 5675 since last week and it randomly freezes every few hours. The longest uptime it has is over 12 hours and the shortest was a little over 10 minutes after reset. I've read almost every single "random freeze" post on the forum and reddit but nothing helped. Really frustrating and would appreciate any pointers.

To start, here's the computer spec:
CPU: Ryzen 1700x
GPU: Radeon RX 580
Memory: 32G DIMM 2666mhz
Storage: 4 1TB HDD in a ZFS pool, 2 SSD in lvm as VM/container storage
Passed memtest

Every few hours, I can't reach the host. Nothing on screen and had to do a manual power cycle.
After power cycle, did `journalctl -b -1` and nothing in the logs suggested anything happened.

Originally thought it was a problem with my RAM. This computer had 16G with 2 DIMMs from different manufacturers. So I bought a new kit with 2x16G DIMM 2666mhz, ran memtest and it passed.

I installed Influxdb on another host and configured to have Proxmox send metrics to my Influxdb instance so I can monitor the vitals. However, when there's a freeze, none of the metrics were out of the ordinary. I currently don't have much running on my Proxmox host - a few containers, a Bitwarden VM and they're idle most of the time. I do have a Windows VM with GPU passthrough but I keep it off most of the time. The Windows VM is not running when the freeze happens.

Then I thought maybe the host was running fine, but somehow dropped off the network so it's unreachable. So I have this command `while true; do date; sleep 1; done | tee output.txt` running in a tmux session so I can inspect the output.txt file after the host seemingly "crashed" to see if it's network problem or not. Another freeze happened and after I power cycled the host, shell into the host, and inspected output.txt. There's no more lines being printed after the time the host crashed, so it definitely ISN'T a network problem.

(reached the char limit, continue in the next post)
 
(continuing...)
After another freeze this morning, I did get something in the kernel logs finally:
Code: 
Jan 17 06:31:51 pmox kernel: rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:

Jan 17 06:31:51 pmox kernel: rcu:         1-...!: (1 GPs behind) idle=b680/0/0x0 softirq=59616/59616 fqs=1 (false positive?)

Jan 17 06:31:51 pmox kernel: rcu:         6-...!: (2 GPs behind) idle=4b00/0/0x0 softirq=254744/254746 fqs=1 (false positive?)

Jan 17 06:31:51 pmox kernel: rcu:         7-...!: (23 GPs behind) idle=72e0/0/0x0 softirq=54375/54375 fqs=1 (false positive?)

Jan 17 06:31:51 pmox kernel: rcu:         15-...!: (9 GPs behind) idle=76b0/0/0x0 softirq=86863/86863 fqs=1 (false positive?)

Jan 17 06:31:51 pmox kernel: rcu:         (detected by 3, t=60004 jiffies, g=1524581, q=3919 ncpus=16)

Jan 17 06:31:51 pmox kernel: Sending NMI from CPU 3 to CPUs 1:

Jan 17 06:31:51 pmox kernel: nmi_backtrace_stall_check: CPU 1: NMIs are not reaching exc_nmi() handler, last activity: 1795203 jiffies ago.

Jan 17 06:31:51 pmox kernel: Sending NMI from CPU 3 to CPUs 6:

Jan 17 06:31:51 pmox kernel: nmi_backtrace_stall_check: CPU 6: NMIs are not reaching exc_nmi() handler, last activity: 1089575 jiffies ago.

Jan 17 06:31:51 pmox kernel: Sending NMI from CPU 3 to CPUs 7:

Jan 17 06:31:51 pmox kernel: nmi_backtrace_stall_check: CPU 7: NMIs are not reaching exc_nmi() handler, last activity: 9118767 jiffies ago.

Jan 17 06:31:51 pmox kernel: Sending NMI from CPU 3 to CPUs 15:

Jan 17 06:31:51 pmox kernel: nmi_backtrace_stall_check: CPU 15: NMIs are not reaching exc_nmi() handler, last activity: 712502 jiffies ago.

Jan 17 06:31:51 pmox kernel: rcu: rcu_preempt kthread timer wakeup didn't happen for 100007 jiffies! g1524581 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402

Jan 17 06:31:51 pmox kernel: rcu:         Possible timer handling issue on cpu=0 timer-softirq=193198

Jan 17 06:31:51 pmox kernel: rcu: rcu_preempt kthread starved for 100014 jiffies! g1524581 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=0

Jan 17 06:31:51 pmox kernel: rcu:         Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior.

Jan 17 06:31:51 pmox kernel: rcu: RCU grace-period kthread stack dump:

Jan 17 06:31:51 pmox kernel: task:rcu_preempt     state:I stack:0     pid:17    tgid:17    ppid:2      flags:0x00004000

Jan 17 06:31:51 pmox kernel: Call Trace:

Jan 17 06:31:51 pmox kernel:  <TASK>

Jan 17 06:31:51 pmox kernel:  __schedule+0x401/0x15e0

Jan 17 06:31:51 pmox kernel:  ? srso_return_thunk+0x5/0x5f

Jan 17 06:31:51 pmox kernel:  schedule+0x33/0x110

Jan 17 06:31:51 pmox kernel:  schedule_timeout+0x95/0x170

Jan 17 06:31:51 pmox kernel:  ? __pfx_process_timeout+0x10/0x10

Jan 17 06:31:51 pmox kernel:  rcu_gp_fqs_loop+0x13d/0x550

Jan 17 06:31:51 pmox kernel:  ? __pfx_rcu_gp_kthread+0x10/0x10

Jan 17 06:31:51 pmox kernel:  rcu_gp_kthread+0xd7/0x1a0

Jan 17 06:31:51 pmox kernel:  kthread+0xf2/0x120

Jan 17 06:31:51 pmox kernel:  ? __pfx_kthread+0x10/0x10

Jan 17 06:31:51 pmox kernel:  ret_from_fork+0x47/0x70

Jan 17 06:31:51 pmox kernel:  ? __pfx_kthread+0x10/0x10

Jan 17 06:31:51 pmox kernel:  ret_from_fork_asm+0x1b/0x30

Jan 17 06:31:51 pmox kernel:  </TASK>

Jan 17 06:31:51 pmox kernel: rcu: Stack dump where RCU GP kthread last ran:

Jan 17 06:31:51 pmox kernel: Sending NMI from CPU 3 to CPUs 0:

Jan 17 06:31:51 pmox kernel: nmi_backtrace_stall_check: CPU 0: NMIs are not reaching exc_nmi() handler, last activity: 883745 jiffies ago.

Jan 17 06:33:53 pmox kernel: INFO: task khugepaged:123 blocked for more than 121 seconds.

Jan 17 06:33:53 pmox kernel:       Tainted: P           O       6.8.12-5-pve #1

Jan 17 06:33:53 pmox kernel: "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.

Jan 17 06:33:53 pmox kernel: task:khugepaged      state:D stack:0     pid:123   tgid:123   ppid:2      flags:0x00004000

Jan 17 06:33:53 pmox kernel: Call Trace:

Jan 17 06:33:53 pmox kernel:  <TASK>

Jan 17 06:33:53 pmox kernel:  __schedule+0x401/0x15e0

Jan 17 06:33:53 pmox kernel:  ? srso_return_thunk+0x5/0x5f

Jan 17 06:33:53 pmox kernel:  schedule+0x33/0x110

Jan 17 06:33:53 pmox kernel:  schedule_timeout+0x157/0x170

Jan 17 06:33:53 pmox kernel:  wait_for_completion+0x88/0x150

Jan 17 06:33:53 pmox kernel:  __flush_work.isra.0+0x1b0/0x2d0

Jan 17 06:33:53 pmox kernel:  ? __pfx_wq_barrier_func+0x10/0x10

Jan 17 06:33:53 pmox kernel:  flush_work+0xe/0x20

Jan 17 06:33:53 pmox kernel:  __lru_add_drain_all+0x14e/0x210

Jan 17 06:33:53 pmox kernel:  lru_add_drain_all+0x10/0x20

Jan 17 06:33:53 pmox kernel:  khugepaged+0x6e/0x9d0

Jan 17 06:33:53 pmox kernel:  ? __pfx_autoremove_wake_function+0x10/0x10

Jan 17 06:33:53 pmox kernel:  ? __pfx_khugepaged+0x10/0x10

Jan 17 06:33:53 pmox kernel:  kthread+0xf2/0x120

Jan 17 06:33:53 pmox kernel:  ? __pfx_kthread+0x10/0x10

Jan 17 06:33:53 pmox kernel:  ret_from_fork+0x47/0x70

Jan 17 06:33:53 pmox kernel:  ? __pfx_kthread+0x10/0x10

Jan 17 06:33:53 pmox kernel:  ret_from_fork_asm+0x1b/0x30

Jan 17 06:33:53 pmox kernel:  </TASK>

Jan 17 06:33:53 pmox kernel: INFO: task nft:124678 blocked for more than 121 seconds.

Jan 17 06:33:53 pmox kernel:       Tainted: P           O       6.8.12-5-pve #1

Jan 17 06:33:53 pmox kernel: "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.

Jan 17 06:33:53 pmox kernel: task:nft             state:D stack:0     pid:124678 tgid:124678 ppid:2035   flags:0x00000002

Jan 17 06:33:53 pmox kernel: Call Trace:

Jan 17 06:33:53 pmox kernel:  <TASK>

Jan 17 06:33:53 pmox kernel:  __schedule+0x401/0x15e0

Jan 17 06:33:53 pmox kernel:  ? srso_return_thunk+0x5/0x5f

Jan 17 06:33:53 pmox kernel:  schedule+0x33/0x110

Jan 17 06:33:53 pmox kernel:  schedule_timeout+0x157/0x170

Jan 17 06:33:53 pmox kernel:  wait_for_completion+0x88/0x150

Jan 17 06:33:53 pmox kernel:  __wait_rcu_gp+0x150/0x160

Jan 17 06:33:53 pmox kernel:  synchronize_rcu+0x12d/0x140

Jan 17 06:33:53 pmox kernel:  ? __pfx_call_rcu_hurry+0x10/0x10

Jan 17 06:33:53 pmox kernel:  ? __pfx_wakeme_after_rcu+0x10/0x10

Jan 17 06:33:53 pmox kernel:  nf_tables_abort+0x30b/0xee0 [nf_tables]

Jan 17 06:33:53 pmox kernel:  ? srso_return_thunk+0x5/0x5f

Jan 17 06:33:53 pmox kernel:  ? kmalloc_trace+0x139/0x360

Jan 17 06:33:53 pmox kernel:  nfnetlink_rcv_batch+0x401/0xa90 [nfnetlink]

Jan 17 06:33:53 pmox kernel:  nfnetlink_rcv+0x13e/0x180 [nfnetlink]

Jan 17 06:33:53 pmox kernel:  netlink_unicast+0x1b3/0x2a0

Jan 17 06:33:53 pmox kernel:  netlink_sendmsg+0x214/0x470

Jan 17 06:33:53 pmox kernel:  ____sys_sendmsg+0x3f7/0x430

Jan 17 06:33:53 pmox kernel:  ? srso_return_thunk+0x5/0x5f

Jan 17 06:33:53 pmox kernel:  ___sys_sendmsg+0x9a/0xf0

Jan 17 06:33:53 pmox kernel:  __sys_sendmsg+0x89/0xf0

Jan 17 06:33:53 pmox kernel:  __x64_sys_sendmsg+0x1d/0x30

Jan 17 06:33:53 pmox kernel:  x64_sys_call+0xce5/0x2480

Jan 17 06:33:53 pmox kernel:  do_syscall_64+0x81/0x170

Jan 17 06:33:53 pmox kernel:  ? count_memcg_events.constprop.0+0x2a/0x50

Jan 17 06:33:53 pmox kernel:  ? srso_return_thunk+0x5/0x5f

Jan 17 06:33:53 pmox kernel:  ? handle_mm_fault+0xad/0x380

Jan 17 06:33:53 pmox kernel:  ? srso_return_thunk+0x5/0x5f

Jan 17 06:33:53 pmox kernel:  ? do_user_addr_fault+0x33e/0x660

Jan 17 06:33:53 pmox kernel:  ? srso_return_thunk+0x5/0x5f

Jan 17 06:33:53 pmox kernel:  ? irqentry_exit_to_user_mode+0x7b/0x260

Jan 17 06:33:53 pmox kernel:  ? srso_return_thunk+0x5/0x5f

Jan 17 06:33:53 pmox kernel:  ? irqentry_exit+0x43/0x50

Jan 17 06:33:53 pmox kernel:  ? srso_return_thunk+0x5/0x5f

Jan 17 06:33:53 pmox kernel:  ? exc_page_fault+0x94/0x1b0

Jan 17 06:33:53 pmox kernel:  entry_SYSCALL_64_after_hwframe+0x78/0x80

Jan 17 06:33:53 pmox kernel: RIP: 0033:0x72fbe7479b80

Jan 17 06:33:53 pmox kernel: RSP: 002b:00007ffd6518cd58 EFLAGS: 00000202 ORIG_RAX: 000000000000002e

Jan 17 06:33:53 pmox kernel: RAX: ffffffffffffffda RBX: 00007ffd6519df50 RCX: 000072fbe7479b80

Jan 17 06:33:53 pmox kernel: RDX: 0000000000000000 RSI: 00007ffd6519de00 RDI: 0000000000000003

Jan 17 06:33:53 pmox kernel: RBP: 00007ffd6519df00 R08: 00007ffd6518cd34 R09: 00005df66db48200

Jan 17 06:33:53 pmox kernel: R10: 000072fbe7661f00 R11: 0000000000000202 R12: 00005df66db47b50

Jan 17 06:33:53 pmox kernel: R13: 0000000000000400 R14: 00007ffd6518cd70 R15: 0000000000000001

Jan 17 06:33:53 pmox kernel:  </TASK>

Jan 17 06:33:53 pmox kernel: INFO: task vgs:124685 blocked for more than 121 seconds.

Jan 17 06:33:53 pmox kernel:       Tainted: P           O       6.8.12-5-pve #1

Jan 17 06:33:53 pmox kernel: "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.

Jan 17 06:33:53 pmox kernel: task:vgs             state:D stack:0     pid:124685 tgid:124685 ppid:2056   flags:0x00000002

Jan 17 06:33:53 pmox kernel: Call Trace:

Jan 17 06:33:53 pmox kernel:  <TASK>

Jan 17 06:33:53 pmox kernel:  __schedule+0x401/0x15e0

Jan 17 06:33:53 pmox kernel:  ? srso_return_thunk+0x5/0x5f

Jan 17 06:33:53 pmox kernel:  ? __call_rcu_common+0xf9/0x750

Jan 17 06:33:53 pmox kernel:  schedule+0x33/0x110

Jan 17 06:33:53 pmox kernel:  schedule_timeout+0x157/0x170

Jan 17 06:33:53 pmox kernel:  wait_for_completion+0x88/0x150

Jan 17 06:33:53 pmox kernel:  __x64_sys_io_destroy+0xe0/0x130

Jan 17 06:33:53 pmox kernel:  x64_sys_call+0x1692/0x2480

Jan 17 06:33:53 pmox kernel:  do_syscall_64+0x81/0x170

Jan 17 06:33:53 pmox kernel:  ? __fput+0x15e/0x2e0

Jan 17 06:33:53 pmox kernel:  ? srso_return_thunk+0x5/0x5f

Jan 17 06:33:53 pmox kernel:  ? kmem_cache_free+0x331/0x400

Jan 17 06:33:53 pmox kernel:  ? srso_return_thunk+0x5/0x5f

Jan 17 06:33:53 pmox kernel:  ? __fput+0x15e/0x2e0

Jan 17 06:33:53 pmox kernel:  ? srso_return_thunk+0x5/0x5f

Jan 17 06:33:53 pmox kernel:  ? srso_return_thunk+0x5/0x5f

Jan 17 06:33:53 pmox kernel:  ? syscall_exit_to_user_mode+0x86/0x260

Jan 17 06:33:53 pmox kernel:  ? srso_return_thunk+0x5/0x5f

Jan 17 06:33:53 pmox kernel:  ? do_syscall_64+0x8d/0x170

Jan 17 06:33:53 pmox kernel:  ? srso_return_thunk+0x5/0x5f

Jan 17 06:33:53 pmox kernel:  ? syscall_exit_to_user_mode+0x86/0x260

Jan 17 06:33:53 pmox kernel:  ? srso_return_thunk+0x5/0x5f

Jan 17 06:33:53 pmox kernel:  ? do_syscall_64+0x8d/0x170

Jan 17 06:33:53 pmox kernel:  ? srso_return_thunk+0x5/0x5f

Jan 17 06:33:53 pmox kernel:  ? do_syscall_64+0x8d/0x170

Jan 17 06:33:53 pmox kernel:  ? syscall_exit_to_user_mode+0x86/0x260

Jan 17 06:33:53 pmox kernel:  ? srso_return_thunk+0x5/0x5f

Jan 17 06:33:53 pmox kernel:  ? do_syscall_64+0x8d/0x170

Jan 17 06:33:53 pmox kernel:  ? srso_return_thunk+0x5/0x5f

Jan 17 06:33:53 pmox kernel:  ? exc_page_fault+0x94/0x1b0

Jan 17 06:33:53 pmox kernel:  entry_SYSCALL_64_after_hwframe+0x78/0x80

Jan 17 06:33:53 pmox kernel: RIP: 0033:0x7746ac8e4799

Jan 17 06:33:53 pmox kernel: RSP: 002b:00007fff0470eb38 EFLAGS: 00000246 ORIG_RAX: 00000000000000cf

Jan 17 06:33:53 pmox kernel: RAX: ffffffffffffffda RBX: 00007746ac3f2b10 RCX: 00007746ac8e4799

Jan 17 06:33:53 pmox kernel: RDX: 00000000000099a1 RSI: 000058ada869ba70 RDI: 00007746acc72000

Jan 17 06:33:53 pmox kernel: RBP: 00007746acc72000 R08: 000058ada8680a50 R09: 00007fff0470edf8

Jan 17 06:33:53 pmox kernel: R10: 0000000000000007 R11: 0000000000000246 R12: 0000000000000000

Jan 17 06:33:53 pmox kernel: R13: 00007fff0470ee50 R14: 000058ad937795f0 R15: 00007746accab020

Jan 17 06:33:53 pmox kernel:  </TASK>

Jan 17 06:33:53 pmox kernel: INFO: task ipset:124694 blocked for more than 121 seconds.

Jan 17 06:33:53 pmox kernel:       Tainted: P           O       6.8.12-5-pve #1

Jan 17 06:33:53 pmox kernel: "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.

Jan 17 06:33:53 pmox kernel: task:ipset           state:D stack:0     pid:124694 tgid:124694 ppid:2046   flags:0x00000002

Jan 17 06:33:53 pmox kernel: Call Trace:

Jan 17 06:33:53 pmox kernel:  <TASK>

Jan 17 06:33:53 pmox kernel:  __schedule+0x401/0x15e0

Jan 17 06:33:53 pmox kernel:  ? srso_return_thunk+0x5/0x5f

Jan 17 06:33:53 pmox kernel:  ? aa_sk_perm+0x46/0x250

Jan 17 06:33:53 pmox kernel:  schedule+0x33/0x110

Jan 17 06:33:53 pmox kernel:  schedule_preempt_disabled+0x15/0x30

Jan 17 06:33:53 pmox kernel:  __mutex_lock.constprop.0+0x3f8/0x7a0

Jan 17 06:33:53 pmox kernel:  ? ____sys_recvmsg+0x111/0x230

Jan 17 06:33:53 pmox kernel:  __mutex_lock_slowpath+0x13/0x20

Jan 17 06:33:53 pmox kernel:  mutex_lock+0x3c/0x50

Jan 17 06:33:53 pmox kernel:  nft_rcv_nl_event+0xa5/0x1a0 [nf_tables]

Jan 17 06:33:53 pmox kernel:  notifier_call_chain+0x61/0xe0

Jan 17 06:33:53 pmox kernel:  blocking_notifier_call_chain+0x41/0x70

Jan 17 06:33:53 pmox kernel:  netlink_release+0x6a0/0x710

Jan 17 06:33:53 pmox kernel:  __sock_release+0x40/0xc0

Jan 17 06:33:53 pmox kernel:  sock_close+0x15/0x30

Jan 17 06:33:53 pmox kernel:  __fput+0xa1/0x2e0

Jan 17 06:33:53 pmox kernel:  __fput_sync+0x1c/0x30

Jan 17 06:33:53 pmox kernel:  __x64_sys_close+0x3e/0x90

Jan 17 06:33:53 pmox kernel:  x64_sys_call+0x19ad/0x2480

Jan 17 06:33:53 pmox kernel:  do_syscall_64+0x81/0x170

Jan 17 06:33:53 pmox kernel:  ? srso_return_thunk+0x5/0x5f

Jan 17 06:33:53 pmox kernel:  ? __sys_recvmsg+0x82/0xe0

Jan 17 06:33:53 pmox kernel:  ? srso_return_thunk+0x5/0x5f

Jan 17 06:33:53 pmox kernel:  ? syscall_exit_to_user_mode+0x86/0x260

Jan 17 06:33:53 pmox kernel:  ? srso_return_thunk+0x5/0x5f

Jan 17 06:33:53 pmox kernel:  ? do_syscall_64+0x8d/0x170

Jan 17 06:33:53 pmox kernel:  ? srso_return_thunk+0x5/0x5f

Jan 17 06:33:53 pmox kernel:  ? do_fault+0x295/0x4c0

Jan 17 06:33:53 pmox kernel:  ? srso_return_thunk+0x5/0x5f

Jan 17 06:33:53 pmox kernel:  ? __handle_mm_fault+0x88f/0xf20

Jan 17 06:33:53 pmox kernel:  ? srso_return_thunk+0x5/0x5f

Jan 17 06:33:53 pmox kernel:  ? __count_memcg_events+0x6f/0xe0

Jan 17 06:33:53 pmox kernel:  ? srso_return_thunk+0x5/0x5f

Jan 17 06:33:53 pmox kernel:  ? count_memcg_events.constprop.0+0x2a/0x50

Jan 17 06:33:53 pmox kernel:  ? srso_return_thunk+0x5/0x5f

Jan 17 06:33:53 pmox kernel:  ? handle_mm_fault+0xad/0x380

Jan 17 06:33:53 pmox kernel:  ? srso_return_thunk+0x5/0x5f

Jan 17 06:33:53 pmox kernel:  ? do_user_addr_fault+0x21e/0x660

Jan 17 06:33:53 pmox kernel:  ? srso_return_thunk+0x5/0x5f

Jan 17 06:33:53 pmox kernel:  ? irqentry_exit_to_user_mode+0x7b/0x260

Jan 17 06:33:53 pmox kernel:  ? srso_return_thunk+0x5/0x5f

Jan 17 06:33:53 pmox kernel:  ? irqentry_exit+0x43/0x50

Jan 17 06:33:53 pmox kernel:  ? srso_return_thunk+0x5/0x5f

Jan 17 06:33:53 pmox kernel:  ? exc_page_fault+0x94/0x1b0

Jan 17 06:33:53 pmox kernel:  entry_SYSCALL_64_after_hwframe+0x78/0x80

Jan 17 06:33:53 pmox kernel: RIP: 0033:0x7f759a82b960

Jan 17 06:33:53 pmox kernel: RSP: 002b:00007fffd8ad4838 EFLAGS: 00000202 ORIG_RAX: 0000000000000003

Jan 17 06:33:53 pmox kernel: RAX: ffffffffffffffda RBX: 00005f7e60337f50 RCX: 00007f759a82b960

Jan 17 06:33:53 pmox kernel: RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003

Jan 17 06:33:53 pmox kernel: RBP: 00005f7e60337f80 R08: 00007f759a92a160 R09: 0000000000000073

Jan 17 06:33:53 pmox kernel: R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000002

Jan 17 06:33:53 pmox kernel: R13: 00007fffd8ad4a30 R14: 00005f7e5a3f3d68 R15: 00007f759a986020

Jan 17 06:33:53 pmox kernel:  </TASK>

Some googling and chatgpt'ing suggested that it's a CPU/kernel bug? Has anything experienced that?

What's more frustrating is now, a few freezes after, I could not get the same kernel message. It's back to what it was before - freezing with no message whatsoever.

Any lead is greatly appreciated!

EDIT: format code
 
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