Without performing any update, suddenly today when I tried to power on a VM in VirtualBox, the host machine (running Ubuntu 16.04) freezed.
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I tried couple of times and the problem keep repeating.
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I run memtest: all good
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Tried to create a new VM just in case: same issue.
- Downgraded the VirtualBox installation: didn't help at all.
- Disabled network, shared folders etc: Nothing.
On the same machine I've also got Windows 10 in dual boot. I've got couple of VMs there in VBox and VMWare. Just to minimize the probability of any HW issue, I started the VMs there and they work just fine.
Any idea?
The only way to recover the host was to hard-reset.
ps: The freeze happens as soon as I click the "Start" button.
Host details:
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VirtualBox: Version 5.0.40_Ubuntu
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Kernel: 4.13.0-26-generic
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Guest: irrelevant (windows 10, OpenSuse, CentOS)
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The log file of VirtualBox is empty.
Best Answer
Figured it out after following:
https://ubuntuforums.org/showthread.php?t=2382314
(Had to upgrade VBox to 5.2 and all worked ok)
In case you need it, had also to follow : VirtualBox - RTR3InitEx failed with rc=-1912 (rc=-1912) in order to completely uninstall all the previous installations
There was a silent security update that caused old VirtualBox installations (older than 5.2) to hang the entire host.