Comment 13 for bug 1837810

As promised, I have an update on the lab machine I left running ksm_refcnt_overflow.sh for a week straight.

The machine was running 4.15.0-116-generic from -proposed:

$ uname -rv
4.15.0-116-generic #117-Ubuntu SMP Fri Aug 28 16:04:22 UTC 2020
$ uptime
 04:36:14 up 7 days, 1 min, 1 user, load average: 3.47, 3.14, 2.97

In that time it has created and destroyed 32,950 virtual machines:

$ virsh list
 Id Name State
----------------------------------------------------
 32945 instance-0 running
 32946 instance-1 running
 32947 instance-2 running
 32948 instance-3 running
 32949 instance-4 running

If we look at the current value of the reference counter, it is still set to 1:

$ cat /proc/zero_page_refcount
Zero Page Refcount: 0x1 or 1

I checked /var/log/kern.log, /var/log/syslog and journalctl, there are no oops messages, and the KVM subsystem is stable.

I am shutting the lab machine down now, as I am convinced the patch is stable. This SRU is still verified.