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[Bug 1626596] Re: Lockup with vhost network

From: Launchpad Bug Tracker
Subject: [Bug 1626596] Re: Lockup with vhost network
Date: Tue, 12 Jan 2021 04:17:25 -0000

[Expired for QEMU because there has been no activity for 60 days.]

** Changed in: qemu
       Status: Incomplete => Expired

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  Lockup with vhost network

Status in QEMU:

Bug description:
  After using Qemu in this configuration successfully for quite a while, I 
changed two things:
  - moved the VM from a 8-core 4GHz host to a slower 2-core 1.6 Ghz machine
  - upgraded qemu from 2.1 to 2.5

  and almost immediately (in a couple hours) got hit with a vhost-
  related lockup.

  QEMU command line is:

  qemu-system-x86_64 -enable-kvm -daemonize -monitor
  unix:./monitor,server,nowait -cpu host -M q35 -balloon virtio -device
  virtio-scsi-pci,id=scsi -device scsi-hd,drive=hd -drive
  ,detect-zeroes=unmap -device virtio-net-pci,netdev=net0,mac=xxxx
  -netdev tap,vhost=on,id=net0,script=xxxx.sh -usbdevice tablet -smp 2
  -m 512 -vnc xxxx:yz

  VM was running fine, except no network traffic was passed from/to it.
  Shutting down the VM, it hung at "Will now halt." The QEMU process was
  unkillable, so the only choice was to sysrq-b the entire box.

  dmesg with sysrq-w attached.

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