Self-detected stall on CPU?

[Taspharel]

Hei there.

I was wondering if somebody can give me a hint on what is happening.
While trying to image a Windows VM, I get the following Error message:

INFO: rcu_sched self-detected stall on CPU ... (206461 ticks this GP) idle=14a/1/4611686018427387906 softirq=53141/53141 fqs=51421
(t=273012 jiffies g=22900 c=22899 q=1093)

This repeats with increasing numbers at the different spots (ticks, idle, t, jiffies etc.)

What can I do? Will try to restart the capture task and see what happens.

Currently running FOG version: 1.5.2.10 on Centos7

Just saw I’m a few version steps behind, will also try an update. But would be interested to know what the message tells me?

[Sebastian Roth]

@Taspharel Have you searched the forums for “rcu_sched” yet?

[Taspharel]

cough
shuffle
squirm

N…o?

Thanks.

[Taspharel]

Ah well. Downgraded the Kernel to the Kernel mentioned here https://forums.fogproject.org/topic/12181/rcu_sched-self-detected-stall-on-cpu-when-capture/7 and here: https://forums.fogproject.org/topic/12929/error-rcu_sched-self-detected-stall-on-cpu-on-legacy-bios-capture-job/16

I got the same problem mentioned in the second link:

FATAL: kernel too old
Kernel panic - not syncing: Attempted to kill init! exitcode=0x00007f00

I tried rebooting the server, no game.

Now I am not sure I understand the information in the second link correctly. I am on the dev-branch and updated today. Is there something I have to do with my FOG version - besides the kernel version downgrades?

[george1421]

@Taspharel https://forums.fogproject.org/topic/12929/error-rcu_sched-self-detected-stall-on-cpu-on-legacy-bios-capture-job/13

Sebastian recompiled the inits to support the older kernels back to 4.15.x. The links are a bit hidden in his post they are under the 64 and 32 bit words. It is safe to replace your existing inits in /var/www/html/fog/service/ipxe directory with these inits. They work with the current as well as legacy kernels back to 4.15.x. As always rename the current inits before you download and install these. You WILL have to do this from the linux command line since the webgui doesn’t have a solution to download inits.

[Taspharel]

Thanks, will try this on monday.

Great help as always!!

[Taspharel]

Thank you so much, with the new / old inits the capture process ran successfully. Am trying to deploy now and see if everythin works out.

Thanks for your help
Sébastien