Builds execute in a Visual Studio command prompt with ~8-10 parallel build jobs. The problem appears quite reproducible in our setup, in the following scenario: The guest system is used as a build server. However the host system does not suffer from any of this: iotop shows almost zero disk load on the host (in the range of 0-2%), and the host remains resonably responsive and usable.
The task manager on Windows shows a very high system load from the "System interrupts" process, and also shows a very high disk load / slow disk response time. The guest system becomes suddenly sluggish due to an extremely high "System Interrupts" load, after it worked without any issues for up to half a day.
I'm experiencing a strange but reproducible problem with a Windows 10 guest on a powerful desktop computer with Ubuntu 18.04 x86_64 host in VirtualBox 6.0.8 (current latest).
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