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[Qemu-devel] [Bug 1793275] Re: Hosts fail to start after update to QEMU

From: Neil Darlow
Subject: [Qemu-devel] [Bug 1793275] Re: Hosts fail to start after update to QEMU 3.0
Date: Sat, 22 Dec 2018 18:33:30 -0000

This bug is not present in QEMU-3.1.0.

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  Hosts fail to start after update to QEMU 3.0

Status in QEMU:

Bug description:
  Host OS: Archlinux
  Host Architecture: AMD64
  Guest OS: FreeBSD-11.2 (x2) and Archlinux (x1)
  Guest Architecture: AMD64

  I have been using QEMU 2.x without issue for a number of years but
  since updating to QEMU 3.0 my guests do not complete startup.

  FreeBSD 11.2 guest failure symptom:
  The two FreeBSD-11.2 guests output repeated messages of "unexpected cache 
type 4". This appears to be an internal error message and I've not found any 
instances of it through Google search.

  Archlinux guest failure symptom:
  The single Archlinux guest gets no further than the message "uncompressing 
initial ramdisk".

  The guests are started by a qemu-kvm invokation. No virtual machine
  managers are used. The command lines used (from ps awx) to launch the
  VMs are:

  address@hidden ~]$ ps awx |grep qemu
   1492 ?        Sl     3:19 /usr/bin/qemu-system-x86_64 -daemonize -pidfile 
/run/qemu_vps1.pid -enable-kvm -cpu host -smp 2 -k en-gb -boot order=c -drive 
file=/dev/system/vps1,cache=none,format=raw,if=virtio,index=0,media=disk -m 
1024 -name FreeBSD_1 -net nic,macaddr=52:54:AD:86:64:00,model=virtio -net 
vde,sock=/run/vde_switch-tap0.sock -monitor telnet:,server,nowait 
   1510 ?        Sl     0:54 /usr/bin/qemu-system-x86_64 -daemonize -pidfile 
/run/qemu_vps2.pid -enable-kvm -cpu host -smp 2 -k en-gb -boot order=c -drive 
file=/dev/system/vps2,cache=none,format=raw,if=virtio,index=0,media=disk -m 
1024 -name Archlinux -net nic,macaddr=52:54:AD:86:64:01,model=virtio -net 
vde,sock=/run/vde_switch-tap0.sock -monitor telnet:,server,nowait 
   1529 ?        Sl     3:07 /usr/bin/qemu-system-x86_64 -daemonize -pidfile 
/run/qemu_vps3.pid -enable-kvm -cpu host -smp 2 -k en-gb -boot order=c -drive 
file=/dev/system/vps3,cache=none,format=raw,if=virtio,index=0,media=disk -m 
1024 -name FreeBSD_2 -net nic,macaddr=52:54:AD:86:64:02,model=virtio -net 
vde,sock=/run/vde_switch-tap0.sock -monitor telnet:,server,nowait 

  The VMs were installed to LVM volumes on the host machine (hence the
  /dev/system/vpsN device names). Networking is over a Linux tap
  interface connected to a VDE2 virtual network switch.

  Currently working version of QEMU: qemu-headless 2.12.1-1
  Failing version of QEMU: qemu-headless-3.0.0-1

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