I am encountering soft lockups where syncthing is involved. When I switch to a standard kernel no lockups happen. However, this is not an option because I need the lowlatency kernel for audio recording.
Operating System is Ubuntu 22.04 LTS. CPU is Intel I9 9900K.
Has anyone seen similar behaviour?
Not specifically, but I’ve seen similar soft lockup issues on a server with an AMD CPU when a Java application generated heavy system I/O and CPU load.
The low latency kernel might have lower thresholds for the NMI watchdog responsible for flagging soft/hard lockups.
If possible, upgrade from Ubuntu 22.04 LTS to 24.04 LTS. Although the bump from 5.15 to the 6.8 Linux kernel is more iterative compared to previous kernel releases (i.e. no huge architectural changes such as between 4.x and 5.x), there are still many worthwhile improvements.
I don’t know what Ubuntu’s policy is regarding CPU microcode updates for the LTS versions, but Intel released an update that included the 9th-gen / “Coffee Lake” CPUs as recently as last year.
Ok, the problem looks solved. A buggy drivers seems to have been the culprit. After removing the driver the soft lockups did not occur any more.
Thank you everyone having shared ideas! I am happy I can use syncthing again. 
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