VirtualBox

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Ticket Resolution Summary Owner Reporter
#16171 duplicate VM Crashes with Critical Error When Connecting USB Devices (VERR_IEM_INSTR_NOT_IMPLEMENTED, stmxcsr) bluedot
Description

VirtualBox crashes with a critical error when connecting USB devices . The error message is: "A critical error has occurred while running the virtual machine and the machine execution has been stopped". This issue is new after upgrading from version 5.0.x to 5.1.x.

#16170 fixed Cracks in audio & slowdown after some time (Windows guest) dusek
Description

I am hitting an issue where audio in the VM begins fine, but after some usage of audio apps, it becomes choppy with cracks after a 1-2 minutes of varying use.

I have no exact repro, usually using audio apps naturally reproduces the issue within 2-3 minutes (I succeeded e.g. by playing YouTube video in firefox, pausing it, focusing other host app, refocusing the VM and playing the video again - the sound did not become slow immediately, but already exhibited "cracks" like when playing a dusty LP).

I will attach the VM log.

I will also attach 2 audio recordings:

  • one for the above VM log with audio completely slowed down and choppy (with VBox 5.1.9)
  • one for the same VM, just after restart using the very same program as in first recording, but before the audio becomes slow and choppy (to have a reference point for what the first recording should have roughly sounded like) (again with VBox 5.1.9)

Configuration:

  • VirtualBox versions:
    • happens on: 5.1.6, 5.1.8 and 5.1.9 (111785)
    • does not happen on: 5.0.28
  • Host: macOS 10.12.1 (16B2555)
  • Guest: Win 7 Pro x86 Czech FPP
  • Host audio: CoreAudio
  • Guest audio controller: hda (Intel HD Audio)

Note: I tried with Linux guest (Ubuntu 16.04 x64). I did not reproduce the problem, so I suppose the issue is connected to Windows guests.

#16168 worksforme Alt-tab tabbing through host windows after having pressed host-key cveld
Description

Many times I use ctrl-left and ctrl-right to navigate through my source code. Sometimes I forget to use the left ctrl and I mistakenly press right ctrl. As this is assigned as the host-key the keyboard capturing is stopped and VirtualBox shows me a dialog what I would like to do.

After choosing to continue with capturing again, alt-tab does not tab through the guest windows anymore, but tabs through the windows on the host.

After closing down the VM, and restarting it, alt-tab tabs through the guest windows again.

How can I reset this behavior without having to close down the VM?

As this behavior really hinders my productivity I have logged this ticket with major priority.

Guest OS: Windows Server 2012 Host OS: Windows 7

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