[vmwgfx]] *ERROR* Failed to open channel

[tysonite]

I am running VirtualBox 6.1.24 on Win10 x64, Hyper-V is paravirtualization interface. Ubuntu 20.04 is guest OS.VM is configured to use VMSVGA with 3D enabled.

During boot up, dmesg log has many following records:

[ 107.916494] 10:21:10.493550 main VBoxService 6.1.24 r145751 (verbosity: 0) linux.amd64 (Jul 15 2021 18:33:29) release log

10:21:10.493575 main Log opened 2021-07-24T10:21:10.493522000Z

[ 107.916494] 10:21:10.493713 main OS Product: Linux [ 107.916494] 10:21:10.493841 main OS Release: 5.8.0-63-generic [ 107.916494] 10:21:10.493933 main OS Version: #71~20.04.1-Ubuntu SMP Thu Jul 15 17:46:08 UTC 2021 [ 107.916494] 10:21:10.494012 main Executable: /opt/VBoxGuestAdditions-6.1.24/sbin/VBoxService

10:21:10.494034 main Process ID: 1337 10:21:10.494057 main Package type: LINUX_64BITS_GENERIC

[ 107.920318] 10:21:10.501490 main 6.1.24 r145751 started. Verbose level = 0 [ 107.927561] 10:21:10.508214 main vbglR3GuestCtrlDetectPeekGetCancelSupport: Supported (#1) [ 121.152249] [drm:vmw_msg_ioctl [vmwgfx]] *ERROR* Failed to open channel. [ 121.152249] [drm:vmw_msg_ioctl [vmwgfx]] *ERROR* Failed to open channel. [ 121.193173] [drm:vmw_msg_ioctl [vmwgfx]] *ERROR* Failed to open channel. [ 121.193173] [drm:vmw_msg_ioctl [vmwgfx]] *ERROR* Failed to open channel. [ 133.960208] rfkill: input handler disabled [ 134.204342] [drm:vmw_msg_ioctl [vmwgfx]] *ERROR* Failed to open channel. [ 134.204342] [drm:vmw_msg_ioctl [vmwgfx]] *ERROR* Failed to open channel. [ 137.828211] [drm:vmw_msg_ioctl [vmwgfx]] *ERROR* Failed to open channel. [ 137.828211] [drm:vmw_msg_ioctl [vmwgfx]] *ERROR* Failed to open channel. [ 174.892246] rfkill: input handler enabled [ 177.579907] [drm:vmw_msg_ioctl [vmwgfx]] *ERROR* Failed to open channel. [ 177.579907] [drm:vmw_msg_ioctl [vmwgfx]] *ERROR* Failed to open channel. [ 178.140558] [drm:vmw_msg_ioctl [vmwgfx]] *ERROR* Failed to open channel. [ 178.140558] [drm:vmw_msg_ioctl [vmwgfx]] *ERROR* Failed to open channel. [ 178.292236] [drm:vmw_msg_ioctl [vmwgfx]] *ERROR* Failed to open channel. [ 178.292236] [drm:vmw_msg_ioctl [vmwgfx]] *ERROR* Failed to open channel. [ 183.200987] [drm:vmw_msg_ioctl [vmwgfx]] *ERROR* Failed to open channel. [ 183.200987] [drm:vmw_msg_ioctl [vmwgfx]] *ERROR* Failed to open channel. [ 184.596248] [drm:vmw_msg_ioctl [vmwgfx]] *ERROR* Failed to open channel. [ 184.596248] [drm:vmw_msg_ioctl [vmwgfx]] *ERROR* Failed to open channel. [ 186.692221] [drm:vmw_msg_ioctl [vmwgfx]] *ERROR* Failed to open channel. [ 186.692221] [drm:vmw_msg_ioctl [vmwgfx]] *ERROR* Failed to open channel.

Detailed logs are attached.

[tysonite]

The graphics repainting is quite slow, I suspect that this happens because of above errors.

[Dmitrii Grigorev]

Hello tysonite.

Please check this solution at first.

​https://docs.microsoft.com/en-us/troubleshoot/windows-client/application-management/virtualization-apps-not-work-with-hyper-v

[tysonite]

Well, this article suggested to disable Hyper-V, which is not an option if you want it to be used. The original issue of this ticket might be related to recent comments saying about regression in https://www.virtualbox.org/ticket/19884.

I am wondering if someone from VB team could double check.

[林博仁(Buo-Ren, Lin)]

@DmitrG I can reproduce the same issue while the host OS is Linux.