Comment 84 for bug 1736116

Tested packages:
virtualbox=5.1.34-dfsg-0ubuntu1.16.04.1
virtualbox-dkms=5.1.34-dfsg-0ubuntu1.16.04.1
virtualbox-ext-pack=5.1.34-dfsg-0ubuntu1.16.04.1
virtualbox-qt=5.1.34-dfsg-0ubuntu1.16.04.1

Host longer freezes on guest boot. Performance seems normal. Bug fixed for me.

Tested with guest OS Windows 7 64-bit with VT-x enabled.

Host details:
$ lscpu | grep "Model name"
Model name: Intel(R) Core(TM) i5-6600T CPU @ 2.70GHz
$ uname -srv
Linux 4.13.0-36-generic #40~16.04.1-Ubuntu SMP Fri Feb 16 23:25:58 UTC 2018
$ lsb_release -d
Description: Ubuntu 16.04.4 LTS

Untested packages:
virtualbox-guest-additions-iso=5.1.34-dfsg-0ubuntu1.16.04.1 (not in repository yet)
kbuild=1:0.1.9998svn2814+dfsg-2~ubuntu16.04.1 (I don't know how to test it)
virtualbox-hwe=5.1.34-dfsg-0ubuntu1.16.04.1 (not in repository yet)
virtualbox=5.1.34-dfsg-0ubuntu1.16.04.2 (not in repository yet)
virtualbox-guest-additions-iso=5.1.34-0ubuntu1.16.04.2 (not in repository yet)