[Bug 1847793] Re: qemu 4.1.0 - Corrupt guest filesystem after new vm install

From: Claus Paetow <1847793@bugs.launchpad.net>
To: qemu-devel@nongnu.org
Subject: [Bug 1847793] Re: qemu 4.1.0 - Corrupt guest filesystem after new vm install
Date: Wed, 16 Oct 2019 12:46:07 -0000	[thread overview]
Message-ID: <157122996729.8989.5001633474423130614.malone@soybean.canonical.com> (raw)
In-Reply-To: 157080798335.681.12255731732435282400.malonedeb@chaenomeles.canonical.com

Hi David,

a)
> qemu-img check /volumes/disk2-part2/images/vmtest10-1.qcow2
No errors were found on the image.
24794/327680 = 7.57% allocated, 9.28% fragmented, 0.00% compressed clusters
Image end offset: 1625751552

> qemu-img info /volumes/disk2-part2/images/vmtest10-1.qcow2
image: vmtest10-1.qcow2
file format: qcow2
virtual size: 20 GiB (21474836480 bytes)
disk size: 1.29 GiB
cluster_size: 65536
Format specific information:
    compat: 1.1
    lazy refcounts: false
    refcount bits: 16
    corrupt: false

b)
The raw image file works without any errors after install and reboot.
I created the image file with:
qemu-img create -f raw /volumes/disk2-part2/images/vmtest10-1.img 20G
Changes to the qemu commandline:
-drive format=raw,file=/volumes/disk2-part2/images/vmtest10-1.img,if=virtio,media=disk,cache=writeback \

c)
I can always repeat this behavior since 4.1.0 is out.
I could perform a git bisect. But I need help, I've never done that before.

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https://bugs.launchpad.net/bugs/1847793

Title:
  qemu 4.1.0 - Corrupt guest filesystem after new vm install

Status in QEMU:
  New

Bug description:
  When I install a new vm with qemu 4.1.0 all the guest filesystems are
  corrupt. The first boot from the install dvd iso is ok and the
  installer work fine. But the guest system hangs after the installer
  finishes and I reboot the guest. I can see the grub boot menue but the
  system cannot load the initramfs.

  Testet with:
  - RedHat Enterprise Linux 7.5, 7.6 and 7.7 (RedHat uses xfs for the /boot and / partition)
  Guided install with the graphical installer, no lvm selected.
  - Debian Stable/Buster (Debian uses ext4 for / and /home partition)
  Guidet install with the graphical installer and default options.

  Used commandline to create the vm disk image:
  qemu-img create -f qcow2 /volumes/disk2-part2/vmdisks/vmtest10-1.qcow2 20G

  Used qemu commandline for vm installation:
  #!/bin/sh
  # vmtest10 Installation
  #
  /usr/bin/qemu-system-x86_64  -cpu SandyBridge-IBRS \
      -soundhw hda \
      -M q35 \
      -k de \
      -vga qxl \
      -machine accel=kvm \
      -m 4096 \
      -display gtk \
      -drive file=/volumes/disk2-part2/images/debian-10.0.0-amd64-DVD-1.iso,if=ide,media=cdrom \
      -drive file=/volumes/disk2-part2/images/vmtest10-1.qcow2,if=virtio,media=disk,cache=writeback \
      -boot once=d,menu=off \
      -device virtio-net-pci,mac=52:54:00:2c:02:6c,netdev=vlan0 \
      -netdev bridge,br=br0,id=vlan0 \
      -rtc base=localtime \
      -name "vmtest10" \
      -usb -device usb-tablet \
      -spice disable-ticketing \
      -device virtio-serial-pci \
      -device virtserialport,chardev=spicechannel0,name=com.redhat.spice.0 \
      -chardev spicevmc,id=spicechannel0,name=vdagent $*

  Host OS:
  Archlinux (last updated at 10.10.2019)
  Linux testing 5.3.5-arch1-1-ARCH #1 SMP PREEMPT Mon Oct 7 19:03:08 UTC 2019 x86_64 GNU/Linux
  No libvirt in use.

  With qemu 4.0.0 it works fine without any errors.

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