May 6, 20224 yr Hi all, after some months of searching I think I found the root cause of my random hangings on shutdown/reboot of my windows 11 virtual machine. It seems that if message signaling interrupts (msi) are enabled on my audio/video gpu (which is needed, otherwise digital audio and video irqs are shared), sometimes windows is not shutting down or rebooting completely. I hate when these things happen randomly... With irqs, line-based interrupts, it seems the vm is shutting down/rebooting ok. When this happens, randomly, windows tries to shutdown, monitors go black, but the vm is reported as still running and I need a forced shutdown. Does anyone have msi enabled on a win11 vm on the gpu?Is it shutting down/rebooting normally? Edited May 6, 20224 yr by ghost82
May 8, 20224 yr Author Solution Nevermind, it was a placebo effect, it seemed it didn't crash for several reboots, then it crashed again. Thanks to an app to analyze the memory dumps (WhoCrashed) I was able to identify the culprit: it's a driver power failure of my mellanox infiniband card. It's a very old card, worked well in windows 7, survived windows 10, but it seems it has issue in windows 11. Luckily I don't use it very much and I can disable the card and unloading the driver (ibbus.sys) before rebooting/shutting down.
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