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Ticket Resolution Summary Owner Reporter
#19717 fixed Storage IO Erros With virtio-scsi Controller When Host I/O Cache is Enabled => fixed in SVN/next 7.0.x and 6.1.x maintenance Miky.Ne
Description

On Ubuntu Server 20.04 guest in Virtualbox 6.1.2 on a Win10 (2004) host: I've selected the virtio-scsi controller and enabled the host I/O cache option to maximize performance. With this configuration, I see multiple I/O related errors in the guest's shell and dmesg log ("Buffer I/O error on device sda2, logical block xxxxxxx", "I/O error, dev sda, sector yyyyyy op 0x0:(READ) flags 0x80700 phys_seg 20 prio class 0", and many others). On the host's log I see multiple messages like "SCSI#0: Read at offset xxxxxxxxx (4096 bytes left) returned rc=VERR_NOT_IMPLEMENTED".

All above errors disappear when host I/O cache is disabled. This seems to have started with Virtualbox 6.1.2. When downgrading to Virtuabox 6.1.0 There are no problems when cache is enabled.

Attached are 2 logs for the same machine (created and running on Virtualbox 6.1.2), one with the cache enabled and the other disabled.

Any help will be much appreciated.

I have reported the problem in the Virtualbox forums:https://forums.virtualbox.org/viewtopic.php?f=3&t=98962, no responses.

#19711 fixed VB GAs are taking over the guest clipboard even with VB clipboard functionality disabled. => Fixed in SVN oivey
Description

Although this issue is literally driving our team nuts I'm afraid we are out of time to invest in it right now.

I am therefore providing the closing status of the virtual box forum discussion in the hope that the Oracle VB Dev team agree that it is a serious issue and resolve it. (further detail and uploaded information can be found on the virtual box forum discussion here: https://forums.virtualbox.org/viewtopic.php?f=3&t=97718&start=15)

Closing status from my perspective:


  1. VB guest additions mess with TigerVNC on CentOS 7 (and likely all Enterprise Linux variations)
  2. The guest additions never used to cause problems prior to 6.1.2 so a Guest additions bug has been introduced.
  3. Version 6.1.10 version of the guest additions has become even more invasive in that it actually changes the VNC client screen dimensions from those set in the VNC configuration file.
  4. This bug is inconsistent in that it doesn't occur on Linux hosts.
  5. I can use the workaround of using standard network shares

My closing observations to the Virtual Box development team should they ever read this:


  1. It is a critical design requirement that Guest additions be transparent to a user accessing the guest operating system. Not being able to rely on this renders the guest additions untrustworthy and therefore useless / dangerous.
  2. while it is possible to use the alternative network share method kindly suggested by @scottgus1, it is not at all ideal because it means that:
  • sharing configuration is required on both the host and the guest (rather than just the VB environment / guest)
  • it introduces a requirement for additional unneeded os packages to installed on the guest to support networking share. This OS inconsistency in environment from one server deployment to another introduces the potential for guest behavioural differences and thus increased risk.
  • the guest now needs knowledge of the host username / passwords in order to access the shares.

Again @scottgus1 - thank you so much for your efforts and help on this topic, I can only hope Oracle put the effort in to correct this.

#19706 fixed MacOS hosts no longer able to run VBoxHeadless as of 6.0.18 and 6.1.4 => fixed in svn/6.1.x x>12 BP myshell
Description

It is impossible to launch a VM in headless mode because of a problem of setugid which is not allowed.

It works fine with VirtualBox 6.1.2 but not with the following versions.

The error message seen is:

$ /Applications/VirtualBox.app/Contents/MacOS/VBoxHeadless -s solaris Oracle VM VirtualBox Headless Interface 6.1.4 (C) 2008-2020 Oracle Corporation All rights reserved.

2020-07-24 09:40:25.798 VBoxHeadless[2026:18559] The application with bundle ID org.virtualbox.app.VirtualBox is running setugid(), which is not allowed.

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