and, more importantly, how can I adjust this threshold for Ubuntu 14.04 server installations?
I have standard Ubuntu 14.04 server VMs crashing due to CPU softlocks and VMWare recommends adjusting this threshold.
With new(er) kernel, you tune
(Older kernels use
/proc/sys/kernel/softlockup_thresh, I think).
I add the following line to end of /etc/sysctl.conf to have it applied at boot:
where nn is a number 0 or higher.