When Guest OS Struggles VM Crashes because of vmmDevHeartbeatFlatlinedTimer

[Kaplan]

With no obvious evidence, 20%-30% times the virtual machine crashes.

I sometimes push hard on the VM but it does not guarantee the crash.

Making a search I found similar bugs as:

• https://www.virtualbox.org/ticket/14501 (strangely most of the times - but not always- during the crashes that I had Visual Studio Code - linux version of MS Visual Studio - was open)
• https://www.virtualbox.org/ticket/15529

I receieve following error and VM crashes according to the log files:

VMMDev: vmmDevHeartbeatFlatlinedTimer: Guest seems to be unresponsive. Last heartbeat received 4 seconds ago

The only thing that I can think of is some peaks in VM CPU may cause Heartbeat to be "flatlined" but it strange that while using the machine I don't feel "4 seconds of no responsiveness".

Attached you can also find a couple of log files from crashes.

[Kaplan]

Another VBox.log.1

[Kaplan]

The problem can be because of some other thing than vmmDevHeartbeatFlatlinedTimer.

The log named VBox.log.2.1 does not have that flag.

[aeichner]

Please reopen if still an issue with a recent VirtualBox release.