Hi, I discovered this last month, before Jean-Philippe's patch series was merged. This issue is now resolved, but I thought it might be of interest to distributions to update their package. I have not assessed the security impact, but it might be a good idea to update kvmtool anyway. Using standard ubuntu images, it's possible to crash kvmtool by inserting/removing the virtio-blk module. I boot with rdinit=/bin/sh, then run the following commands: mkdir sys; mount -t sysfs s /sys modprobe virtio-net modprobe virtio-blk; modprobe -r virtio-blk modprobe virtio-blk This might be related to the lack of uninit of virtio devices, since I can't reproduce the issue after applying Jean-Philippe's patch series "Implement reset of virtio devices" (now merged in git) : https://marc.info/?l=android-virt&m=154712959225769&w=4 I packaged the ubuntu kernel and a reduced initramfs to ease reproducing the issue (the init script does it automatically): https://anisse.astier.eu/static/crash-kvmtool.tar.xz I haven't look in detail at the issue, but it crashes after memory has been corrupted, the gdb stack isn't really helpful. Regards, Anisse
