id	summary	reporter	owner	description	type	status	component	version	resolution	keywords	cc	guest	host
15277	"VMs won't start hanging with msg ""Starting virtual machine - 0%"""	eugenesany		"(Also reported at https://bugs.launchpad.net/ubuntu/+source/virtualbox/+bug/1562397)
On fresh Ubuntu 16.04 with VirtualBox 5.0.16 virtual machines won't start hanging with msg box ""Starting virtual machine - 0%"".
The issues is not persistent but once it happens to specific virtual machine, that machine won't start anymore.

Observations:
- Affects both build from Xenial repo and Oracle package
- Both Linux and Windows virtual machines affected but Windows machines cause heavy I/O until all VirtualBox processes are killed
- Tested on Skylake and Sandybridge machines
- Downgrading to 5.0.14 doesn't help
- Removing extensions pack doesn't help
- libvirt@qemu-kvm is working ok
- Nothing useful in log but attached anyway
- No suspicious massages in dmesg

Might be related to system being installed on BTRFS.
"	defect	closed	other	VirtualBox 5.0.16	duplicate			all	Linux