On 1 December 2017 at 08:29, Kai Gallasch <k...@free.de> wrote:

> Hello.
> Last day an apache 2.4 running inside a Debian9 linux bhyve VM locked up
> on one of my servers (FreeBSD 11.1-RELENG, GENERIC kernel) overloading
> the VM.
> The VM uses a ZFS zvol blockdevice on top of a zpool, consisting of two
> mirrored SSDs.
> I was able to enter the VM through the bhyve console, kill and restart
> the stuck apache process and regain stability inside the VM.
> I found below output in the Linux dmesg and suspect the ext4 journaling
> to be the culprit.
> Has anyone experienced similar lockups running Linux inside a bhyve VM?
> At the time when this happened there was no high I/O on the VM zpool.

Have you set vfs.zfs.arc_max to a lower value to allow for bhyve head
room?  How was the host system swap, did the host start to eat into it?

I run a few guests with Ubuntu 16.04 but mainly use XFS for areas that
aren't system related and haven't come across this issue.


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