I've been experiencing something that sounds very similar to what has been described in this issue post and want to see if you guys think it's the same issue. For me from a cold boot everything is fine for a while and I can restart my vm and such just fine. but after a long time or stressful stuff mining/gaming if I shutdown my vm the host displays will all go to sleep and the system locks up which I had been assuming is a display driver crash. I can also sometimes trigger the exact same lockup by calling lspci. once such a lockup has happened I have to hard reset. where this gets even weirder is that after this happens I will get the same lockup during the startup process around when xorg loads. when this happens I either have to leave my computer alone for around 30 minutes to an hour, or I can get it to boot by disabling iommu with iommu=off as a kernel param, and then if I wait around 30 minutes to an hour I can restart and it will boot fine again with iommu=pt (I get a kernel panic if i don't use iommu=pt)
Hardware Ryzen R5 1600 asrock ab350m pro4 32gb ram Host gpu RX580 Guest gpu GTX1070 -- You received this bug notification because you are a member of qemu- devel-ml, which is subscribed to QEMU. https://bugs.launchpad.net/bugs/1580459 Title: Windows (10?) guest freezes entire host on shutdown if using PCI passthrough Status in libvirt: New Status in QEMU: New Status in Arch Linux: New Status in Debian: New Status in Fedora: New Bug description: Problem: after leaving a Windows VM that uses PCI passthrough (as we do for gaming graphics cards, sound cards, and in my case, a USB card) running for some amount of time between 1 and 2 hours (it's not consistent with exactly how long), and for any amount of time longer than that, shutting down that guest will, right as it finishes shutting down, freeze the host computer, making it require a hard reboot. Unbinding (or in the other user's case, unbinding and THEN binding) any PCI device in sysfs, even one that has nothing to do with the VM, also has the same effect as shutting down the VM (if the VM has been running long enough). So, it's probably an issue related to unbinding and binding PCI devices. There's a lot of info on this problem over at https://bbs.archlinux.org/viewtopic.php?id=206050 Here's a better-organized list of main details: -at least 2 confirmed victims of this bug; 2 (including me) have provided lots of info in the link -I'm on Arch Linux and the other one is on Gentoo (distro-nonspecific) -issue affects my Windows 10 guest and others' Windows guests, but not my Arch Linux guest (the others don't have non-Windows guests to test) -I'm using libvirt but the other user is not, so it's not an issue with libvirt -It seems to be version non-specific, too. I first noticed it at, or when testing versions still had the issue at (whichever version is lower), Linux 4.1 and qemu 2.4.0. It still persists in all releases of both since, including the newest ones. -I can't track down exactly what package downgrade can fix it, as downgrading further than Linux 4.1 and qemu 2.4.0 requires Herculean and system-destroying changes such as downgrading ncurses, meaning I don't know whether it's a bug in QEMU, the Linux kernel, or some weird seemingly unrelated thing. -According to the other user, "graphics intensive gameplay (GTA V) can cause the crash to happen sooner," as soon as "15 minutes" -Also, "bringing up a second passthrough VM with separate hardware will cause the same crash," and "bringing up another VM before the two-hour mark will not result in a crash," further cementing that it's triggered by the un/binding of PCI devices. -This is NOT related to the very similar bug that can be worked around by not passing through the HDMI device or sound card. Even when we removed all traces of any sort of sound card from the VM, it still had the same behavior. To manage notifications about this bug go to: https://bugs.launchpad.net/libvirt/+bug/1580459/+subscriptions
