I regularly before a release pull in fixes that were posted for qemu-stable. This is one of them, I'll again do such a build and retest this issue with it.
I identified and backported (only one needed modification) 33 patches. But as usual there might be some context needed on top - I have build that over night in [1] Testing that on my reproducer Attach-host: [84652.671123] vfio-pci 0000:08:00.2: enabling device (0000 -> 0002) Attach-guest: [ 45.199920] pci 0000:00:08.0: [15b3:1016] type 00 class 0x020000 [ 45.200374] pci 0000:00:08.0: reg 0x10: [mem 0x00000000-0x000fffff 64bit pref] [ 45.201358] pci 0000:00:08.0: enabling Extended Tags [ 45.202726] pci 0000:00:08.0: 0.000 Gb/s available PCIe bandwidth, limited by Unknown speed x0 link at 0000:00:08.0 (capable of 63.008 Gb/s with 8 GT/s x8 link) [ 45.208316] pci 0000:00:08.0: BAR 0: assigned [mem 0x100000000-0x1000fffff 64bit pref] [ 45.256566] mlx5_core 0000:00:08.0: enabling device (0000 -> 0002) [ 45.262103] mlx5_core 0000:00:08.0: firmware version: 14.27.1016 [ 45.544010] mlx5_core 0000:00:08.0: MLX5E: StrdRq(0) RqSz(1024) StrdSz(256) RxCqeCmprss(0) [ 45.710123] mlx5_core 0000:00:08.0 ens8: renamed from eth0 [ 60.992547] random: crng init done [ 60.992552] random: 3 urandom warning(s) missed due to ratelimiting Detach-host: [84926.767411] mlx5_core 0000:08:00.2: enabling device (0000 -> 0002) [84926.767514] mlx5_core 0000:08:00.2: firmware version: 14.27.1016 [84927.036146] mlx5_core 0000:08:00.2: MLX5E: StrdRq(0) RqSz(1024) StrdSz(256) RxCqeCmprss(0) [84927.208523] mlx5_core 0000:08:00.2 ens1v1: renamed from eth0 Detach-guest: <nothing> So yes, these changes fix the issue here (and a bunch of others). I'll open up an MP to get these changes into Ubuntu 20.04. [1]: https://launchpad.net/~ci-train-ppa-service/+archive/ubuntu/3981 -- You received this bug notification because you are a member of qemu- devel-ml, which is subscribed to QEMU. https://bugs.launchpad.net/bugs/1867519 Title: qemu 4.2 segfaults on VF detach Status in QEMU: Fix Committed Status in qemu package in Ubuntu: Confirmed Bug description: After updating Ubuntu 20.04 to the Beta version, we get the following error and the virtual machines stucks when detaching PCI devices using virsh command: Error: error: Failed to detach device from /tmp/vf_interface_attached.xml error: internal error: End of file from qemu monitor steps to reproduce: 1. create a VM over Ubuntu 20.04 (5.4.0-14-generic) 2. attach PCI device to this VM (Mellanox VF for example) 3. try to detaching the PCI device using virsh command: a. create a pci interface xml file: <hostdev mode='subsystem' type='pci' managed='yes'> <driver name='vfio'/> <source> <address type='pci' domain='0x0000' bus='0x11' slot='0x00' function='0x2' /> </source> </hostdev> b. #virsh detach-device <VM-Doman-name> <pci interface xml file> - Ubuntu release: Description: Ubuntu Focal Fossa (development branch) Release: 20.04 - Package ver: libvirt0: Installed: 6.0.0-0ubuntu3 Candidate: 6.0.0-0ubuntu5 Version table: 6.0.0-0ubuntu5 500 500 http://il.archive.ubuntu.com/ubuntu focal/main amd64 Packages *** 6.0.0-0ubuntu3 100 100 /var/lib/dpkg/status - What you expected to happen: PCI device detached without any errors. - What happened instead: getting the errors above and he VM stuck additional info: after downgrading the libvirt0 package and all the dependent packages to 5.4 the previous, version, seems that the issue disappeared To manage notifications about this bug go to: https://bugs.launchpad.net/qemu/+bug/1867519/+subscriptions
