VM disturbing the whole machine

greg

Active Member
Apr 6, 2011
46
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Greetings
I've been using Proxmox for years, mainly form CTs, with a few VMs.
Recently I started developing for Docker, so I created various VMs and CTs for testing.

The last VM I created is problematic: when it's running, the whole machine (host + other guests) are slow and show messages like:

Code:
NMI watchdog: BUG:soft lockup - CPU#2 stuck for 21s!
The problematic VM itself show weird messages:
Code:
rcu_sched detected stalls on CPUs/tasks:
6-...0: (1 GPs behind) idle=52a/1/0x4000000000 softirq=2573/2574 fqs=2506
(detected by 3, t=5252 jiffies, g=3089, q=271)
rcu_sched kthread starved for 1366 fiffies! g3089 f0x0 RCU_Gp_DOING_FQS(6) ->state=0x0 ->cpu=0
There's nothing running in it beside the Docker daemon. The "summary" page show low CPU usage, low memory, low network.

I'm puzzled... any idea?

Thanks in advance

Regards
 

dcsapak

Proxmox Staff Member
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Feb 1, 2016
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maybe it is saturation your storage? this would explain why everything else is slow
 

greg

Active Member
Apr 6, 2011
46
1
28
Thanks for your answer. Storage has 200G left. Would that be a possible explanation for my problem? when the VM is not running, everything works fine.
 

dcsapak

Proxmox Staff Member
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Feb 1, 2016
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no i meant that the vm maybe generates a high io load (iow. reads and writes much) so that the disk is saturated
 

dcsapak

Proxmox Staff Member
Staff member
Feb 1, 2016
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not much what it can be then... anything in the guest/host logs ?
 

greg

Active Member
Apr 6, 2011
46
1
28
Only the weird CPU/irq message I posted.
I'm trying to free a lot of space to test if space is the problem, I know ZFS deals poorly with low disk space.
 

greg

Active Member
Apr 6, 2011
46
1
28
It seems you were right: I casually let the zfs partition go behind 80% and it was probably the root cause. After a lot of cleanup, things seems to be back to normal. Thanks a lot!!
 

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