Infinite Loop in Guest Addition for Windows XP (1 Core always 100% on VBoxTray.exe)

[Francesco Bucciantini]

Hi guys, on July 8th 2024 I raised an issue with the development snapshot uploaded on 2024-07-04T18:53:02, namely version 7.0.97 r163779 on Fedora 40, kernel 6.9.6 as it was cycling through something. In my 4c/8th configuration the process VirtualBoxVM constantly used at least 15% CPU time which means that it's always using 1 core at 100% despite the guest being completely idling. This seems to be occurring regardless of the guest, although I made the tests in particular on Windows XP. Anyway everything pointed towards an issue within the hypervisor. This didn't happen with the last but one development snapshot version and it also doesn't happen with the last but one stable build, namely 7.0.18 r162988. I was hoping this was gonna be debugged and caught early before the stable release, but unfortunately I can now confirm that the issue has been carried over from the development snapshot 7.0.97 r163779 to the last stable release 7.0.20 r163906.

Logs: ​https://forums.virtualbox.org/download/file.php?id=52945

Forum reference for 7.0.97 r163779 Development Snapshot ​https://forums.virtualbox.org/viewtopic.php?p=548925#p548925

Forum reference for 7.0.20 r163906 Stable: ​https://forums.virtualbox.org/viewtopic.php?t=111893

[Francesco Bucciantini]

Screenshot highlighting the problem with the guest addition (25% CPU in 4c/4th means 1 core is always at 100%)

[Francesco Bucciantini]

Logs of the VM experiencing the issue