Comment 3 for bug 1728256

It happened again, both with the e1000 and the rtl8139 NICs under qemu 2.11.0.rc0-7-g4ffa88c99c. Kernel is the official Arch one, right now on 4.13.12.

At this point I have no idea anymore what could be causing this, and am unable to test without having to remove basic functionality from the VM (e.g. the graphics card) or downgrading the host kernel (which I really want to avoid because I'm using btrfs).

That said, during the last several days I did not experience these weird hangup issues that I described previously, however I did see very high CPU load in the guest that was caused by the network (listed in task manager as System Interrupts, and going as high as one full CPU core during large network operations).

What is most interesting though is that it survived while I tried my best to get it to crash (stress-testing CPU and network, mostly), and then hit me with a Bluescreen in a most unexpected time almost a week later. Since then however it started crashing anywhere between a few hours and about two days of consecutive uptime again, just like before.

@larsk, could you elaborate on your setup? Like, in which ways is it different (other than you using Ubuntu and thus different versions of the involved software)?
Which hardware do you pass through, if any?