RCU_sched self-detected stall on CPU?!?

Upgraded to 2021.6.5 and get rcu: notification on the console. Does anyone know what this means?

I’m running HA in Proxmox on HPZ420 Xeon processor with 32GB RAM. Supervisor-2021.06.3

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I just got this error for the first time today too. 2021.6.6 upgraded a few days ago. ProxMox on i3-2120 with 8GB RAM, supervisor-2021.06.6.

Reboot seems to have fixed it for now.

Just had the same. Has it happened again to either of you?

In my case, the issue was related to a USB transmitter/receiver (Wyze) that was attached and not properly setup with Proxmox hardware. I would unplug and detach any peripheral devices assigned to your HA VM in proxmox and reboot. If the issue is resolved, you can attempt to add the device again.

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i disconnected the audio device in VirtualBox and changed the chipset in System tab to ICH9.
after that i had to select boot device in VM bios.
4-5days have passed and i have no problem.

i watch video aboth linux rcu stall’s
one of the explanations was that cpu’s might have diferent timings, so i limited my os to one cpu and no problems, next i found some checkbox in acceleration tab that enable some timing future that are required for unix. i checked that box trow another cpu and so far (2days) no problem.