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I have a ThinkPad X1C9 laptop connected to 3 displays via thunderbolt and an nVidia 1050Ti in an external GPU enclosure. My syslog is getting spammed with the following, why?

Googling CJobMgr led me to Steam. Closed Steam and it stopped. If I open Steam again it starts happening immediately.

[Tue Aug 10 10:17:42 2021] x86/split lock detection: #AC: CJobMgr::m_Work/28558 took a split_lock trap at address: 0xf21b3263
[Tue Aug 10 10:17:43 2021] x86/split lock detection: #AC: CJobMgr::m_Work/28520 took a split_lock trap at address: 0xf21b3263
[Tue Aug 10 10:17:43 2021] x86/split lock detection: #AC: CJobMgr::m_Work/28520 took a split_lock trap at address: 0xf21b3263
[Tue Aug 10 10:17:43 2021] x86/split lock detection: #AC: CJobMgr::m_Work/28558 took a split_lock trap at address: 0xf21b3263
[Tue Aug 10 10:17:44 2021] x86/split lock detection: #AC: CJobMgr::m_Work/28520 took a split_lock trap at address: 0xf21b3263
[Tue Aug 10 10:17:45 2021] x86/split lock detection: #AC: CJobMgr::m_Work/28558 took a split_lock trap at address: 0xf21b3263
alan@ac:~$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 21.04
Release:        21.04
Codename:       hirsute
alan@ac:~$ uname -a
Linux ac 5.11.0-25-generic #27-Ubuntu SMP Fri Jul 9 23:06:29 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux

I have found the following resources during my search but they haven't helped:

I have filed an issue upstream with the Steam client, as it's the only thing that triggers this issue:

4
  • It looks like you have two processes that causes a split lock (PID 28558 and PID 28520?) - which processes are those? More info here (or search for "x86/split lock detection"). Aug 9 at 10:20
  • Googling CJobMgr led me to Steam. Closed Steam and it stooped. If I open Steam again it starts happening immediately.
    – popey
    Aug 9 at 10:21
  • As I understand it, a split lock can "just" be a warning. If you somehow decide that it's ok to go on with it, you could suppress the log messages. Unfortunately, I'm not at all familiar with Steam on Ubuntu - but now you identified the offending app. Aug 9 at 10:22
  • 1
    FWIW, I'm getting the same on my Dell Latitude 5520 laptop (i7 iGPU + Nvidia MX450 dGPU) running Gentoo. Have said the same on your open issue on GitHub.
    – DarkMoon
    Oct 2 at 12:06

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