[Bug 225791] ena driver causing kernel panics on AWS EC2

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=225791

--- Comment #25 from Richard Paul <richard at primarysite.net> ---
This has been sat on my to do list for a while.  I'm hoping that if I can get
my next job out of the way this week I'll revisit this.

Further to my previous posts we seem to see that on instances faced with
moderate memory pressure whilst also seeing reasonable amounts of writing to
disks that are running on ZFS datasets the reboots seem to happen more
regularly.  

We don't see this just where there is memory pressure, e.g. Varnish servers
which are running purely within memory we haven't seen this even though the
memory usage is very close to 100%.
If we double the memory on a crashing instance, the issue goes away. 


As such I'm going to attempt to force memory pressure on a test server with an
additional disk with a  zpool and zfs dataset to attempt to reproduce this on a
recent 12.0 instance.

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