QEMU + snapshots - pvclock0: unstable result on stable clock

[Zach Nedwich]

Hi all,

I'm running OpenBSD snapshots on QEMU (amd64) via a VPS provider, I
upgraded yesterday and now I'm unable to boot.

The panic is: pvclock0: unstable result on stable clock

Excuse the images as a NoVNC console is the only out-of-band access I have:


[image: 1543825179.png]
[image: 1543825235.png]

Any input would be appreciated.

Thanks,
Zach

[Reyk Floeter]

Hi,

thanks for the report.

We’re going to disable pvclock until I found a solution. It seems that old KVMs or KVM on old CPUs report stable support incorrectly.

Do you have a dmesg?

Reyk

Post by Zach Nedwich
Hi all,
I'm running OpenBSD snapshots on QEMU (amd64) via a VPS provider, I
upgraded yesterday and now I'm unable to boot.
The panic is: pvclock0: unstable result on stable clock
[image: 1543825179.png]
[image: 1543825235.png]
Any input would be appreciated.
Thanks,
Zach

[Zach Nedwich]

Thanks Reyk,

dmesg from bsd.rd attached, apologies again for the pictures.

[image: 1543831744.png]
[image: 1543831753.png]
[image: 1543831765.png]
[image: 1543831775.png]
[image: 1543831786.png]

Thanks,
Zach

Post by Reyk Floeter
Hi,
thanks for the report.
We’re going to disable pvclock until I found a solution. It seems that old
KVMs or KVM on old CPUs report stable support incorrectly.
Do you have a dmesg?
Reyk

Post by Zach Nedwich
Hi all,
I'm running OpenBSD snapshots on QEMU (amd64) via a VPS provider, I
upgraded yesterday and now I'm unable to boot.
The panic is: pvclock0: unstable result on stable clock
Excuse the images as a NoVNC console is the only out-of-band access I
[image: 1543825179.png]
[image: 1543825235.png]
Any input would be appreciated.
Thanks,
Zach

[RD Thrush]

Post by Reyk Floeter
thanks for the report.
We’re going to disable pvclock until I found a solution. It seems that old KVMs or KVM on old CPUs report stable support incorrectly.
Do you have a dmesg?

I mistakenly sent the following to bugs@ and it appears to be greytrapped.

I've attached the serial console output from an older proxmox MP with i386 6.4-release dmesg as well as the install and fail of the recent snapshot. One additional point I noticed was the console hung after entering 'machine ddbcpu 1' requiring a (simulated) hard reset.