** Description changed:

  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.
+ The issue 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.

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https://bugs.launchpad.net/bugs/1562397

Title:
  VMs won't start hanging with msg "Starting virtual machine - 0%"

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