On Sat, May 08, 2021 at 08:14:35AM -0400, Dave Voutila wrote: > > Josh Rickmar writes: > > > On Fri, May 07, 2021 at 04:19:18PM -0400, Dave Voutila wrote: > >> > >> Josh Rickmar writes: > >> > >> >>Synopsis: vmm protection fault trap > >> >>Category: vmm > >> >>Environment: > >> > System : OpenBSD 6.9 > >> > Details : OpenBSD 6.9-current (GENERIC.MP) #6: Thu May 6 10:16:53 > >> > MDT 2021 > >> > > >> > dera...@amd64.openbsd.org:/usr/src/sys/arch/amd64/compile/GENERIC.MP > >> > > >> > Architecture: OpenBSD.amd64 > >> > Machine : amd64 > >> >>Description: > >> > > >> > My nixos vm is causing the host kernel to crash (after cold boot) with > >> > 'protection fault trap, code=0'. The guest is running Linux 5.11.14 > >> > (guest dmesg included after the host dmesg below). I've also attached > >> > a screenshot of ddb showing the backtrace and registers. > >> > > >> >>How-To-Repeat: > >> > > >> > The crash can be reliably triggered by doing heavy disk IO on the vm. > >> > Upgrading the VM actually got the nixos install wedged during an > >> > initial crash, and attempting to repair it with "nix-build -A system > >> > '<nixpkgs/nixos>' --repair" is reliably repeating the crash. > >> > >> Any chance you've experienced this with a non-NixOS guest? I can't > >> reproduce this error on my Ryzen5 Pro host. > >> > > I've reproduced this locally with the help of abieber@. Seems I just > need to boot a nixos iso (nixos-21.05pre287333.63586475587-x86_64) and > try installing a package like git into the ramdisk: > > # nix-env -f '<nixpkgs>' -iA git > > I still haven't triggered this without nixos, but at least I can > reproduce it locally now. :-) > > -dv >
robert@ reported this same bug a long time ago and I could never reproduce it. I'll see if it repros against my R415 using these instructions. -ml
