Public bug reported:
Ubuntu 20.04 LTS and Ubuntu 21.04 occasionally boots with very bad
performance and very unresponsive to user input on Lenovo laptop Lenovo
300e 2nd Gen 81M9 (LENOVO_MT_81M9_BU_idea_FM_300e 2nd G).
When this happens you can read this kind of messages on journal:
---
root@alumne-1-58:~# journalctl | grep "BUG: soft"
may 20 21:44:35 alumne-1-58 kernel: watchdog: BUG: soft lockup - CPU#3 stuck
for 22s! [swapper/3:0]
may 20 21:44:35 alumne-1-58 kernel: watchdog: BUG: soft lockup - CPU#3 stuck
for 22s! [swapper/3:0]
may 22 09:33:34 alumne-1-58 kernel: watchdog: BUG: soft lockup - CPU#0 stuck
for 22s! [swapper/0:0]
may 24 16:45:14 alumne-1-58 kernel: watchdog: BUG: soft lockup - CPU#1 stuck
for 23s! [prometheus-node:4220]
may 24 16:45:14 alumne-1-58 kernel: watchdog: BUG: soft lockup - CPU#0 stuck
for 23s! [swapper/0:0]
jun 03 00:01:09 alumne-1-58 kernel: watchdog: BUG: soft lockup - CPU#0 stuck
for 22s! [swapper/0:0]
jun 03 00:01:09 alumne-1-58 kernel: watchdog: BUG: soft lockup - CPU#0 stuck
for 23s! [swapper/0:0]
jun 03 00:01:09 alumne-1-58 kernel: watchdog: BUG: soft lockup - CPU#1 stuck
for 22s! [swapper/1:0]
jun 03 00:01:09 alumne-1-58 kernel: watchdog: BUG: soft lockup - CPU#0 stuck
for 22s! [swapper/0:0]
jun 03 00:02:15 alumne-1-58 kernel: watchdog: BUG: soft lockup - CPU#0 stuck
for 21s! [swapper/0:0]
jun 05 08:22:58 alumne-1-58 kernel: watchdog: BUG: soft lockup - CPU#3 stuck
for 22s! [irq/138-iwlwifi:1044]
jun 05 08:25:06 alumne-1-58 kernel: watchdog: BUG: soft lockup - CPU#2 stuck
for 22s! [swapper/2:0]
jun 05 08:25:06 alumne-1-58 kernel: watchdog: BUG: soft lockup - CPU#3 stuck
for 22s! [irq/138-iwlwifi:1044]
jun 05 08:26:42 alumne-1-58 kernel: watchdog: BUG: soft lockup - CPU#1 stuck
for 23s! [lxd:3975]
jun 05 08:26:42 alumne-1-58 kernel: watchdog: BUG: soft lockup - CPU#2 stuck
for 23s! [swapper/2:0]
jun 05 08:26:42 alumne-1-58 kernel: watchdog: BUG: soft lockup - CPU#3 stuck
for 23s! [irq/138-iwlwifi:1044]
jun 05 08:27:38 alumne-1-58 kernel: watchdog: BUG: soft lockup - CPU#3 stuck
for 23s! [irq/138-iwlwifi:1044]
jun 05 08:28:34 alumne-1-58 kernel: watchdog: BUG: soft lockup - CPU#3 stuck
for 22s! [irq/138-iwlwifi:1044]
jun 05 08:29:46 alumne-1-58 kernel: watchdog: BUG: soft lockup - CPU#3 stuck
for 22s! [irq/138-iwlwifi:1044]
root@alumne-1-58:~#
---
Usually if you reboot everything works fine but it's very annoying when
happens.
** Affects: ubuntu
Importance: Undecided
Status: New
** Tags: kernel-bug
** Attachment added: "output of lshw"
https://bugs.launchpad.net/bugs/1931001/+attachment/5502691/+files/lshw.txt
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https://bugs.launchpad.net/bugs/1931001
Title:
kernel: watchdog: BUG: soft lockup - CPU#3 stuck for 22s!
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