[Ubuntu 17.04x64 Hyper-V VM] Complete system hang while transcoding
Hi there, I'm running PMS on an Ubuntu 17.04 VM named Plex, running on Hyper-V 2016 and after it's been transcoding for a while, the system will become completely non-responsive (no pings, response in the app, unable to switch ttys on the virtual console, locked with two cores at 100%CPU) but Plex will continue to log activity. This happens almost every time that Plex has been transcoding for longer than a few minutes. Hardware is a dual Xeon E5504 with 48GB RAM with 6 NLSAS 10K 1TB drives in RAID 6 on a PERC 530.
I was having similar problems with this same setup after upgrading to 1.5, however that was upgraded along the way from 0.8 or 0.9 something on Ubuntu 15.04 or something all the way up to 17.04 so I decided to destroy the VM and build a new one to try to eliminate the issue.
Everything was freshly installed, no settings are customized, plex is running under plex:plex. All media is stored on NFS mounted volumes, temporary transcode directory is set to /tmp on the PMS VM so as not to try to put it on the NFS volume. Plex is configured with 7CPUs which crosses a NUMA line, but numa=off in Grub, as well as elevator=noop. However I had these issues without elevator and noop settings in grub. It's got 8GB of RAM assigned, 18788MB of RAM is the maximum amount of memory per NUMA node.
I've attached the kernel.log from the start of the freeze til the reset, as well as the PMS log from the same time.