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[Bug 872417] New: unstable btrfs and libvirt (KVM) cause kernel panic
  • From: bugzilla_noreply@xxxxxxxxxx
  • Date: Mon, 7 Apr 2014 19:27:22 +0000
  • Message-id: <>

Summary: unstable btrfs and libvirt (KVM) cause kernel panic
Classification: openSUSE
Product: openSUSE Factory
Version: 13.2 Milestone 0
Platform: x86-64
OS/Version: openSUSE 13.2
Status: NEW
Severity: Critical
Priority: P5 - None
Component: Other
AssignedTo: bnc-team-screening@xxxxxxxxxxxxxxxxxxxxxx
ReportedBy: pomulder@xxxxxxxxx
QAContact: qa-bugs@xxxxxxx
Found By: ---
Blocker: ---

User-Agent: Mozilla/5.0 (Windows NT 6.3; WOW64; rv:28.0) Gecko/20100101

New Installation of OS 13.2 MS 0 on i7-4700 / 16GB
Installed it on one disk and used the YaST2 default settings.
root / as btrfs

moved /lib/libvirt to a fs on another disk with pleanty of space (> 200GB).
Where /lib/libvirt was moved from a btrfs fs (about 30GB free)
Where /lib/libvirt was moved to a XFS fs
did put a symblic link 'ln -s /myfs/libvirt /lib/libvirt' in place.

Created a KVM - Win7 VM. During installation of the Win7 OS in the VM, very
very heavy physical IO occured on the fs with btrfs.

I couldn't manage to get the software installed in the running VM - had always
funny errors (message: modified HW configuration. although nothing was

When the system/monitor was opened as well the kernel quited with Kernel Panic.

The btrfs fs (/) was scrutinezed.

Reproducible: Couldn't Reproduce

Steps to Reproduce:
I presume the fact that the checksums aren't equal for win7a.iso and win7b.iso
is an indication for a severe IO issue.

Actual Results:
kernel panic and lost btfrs fs /

Expected Results:
would be nice having a vm with win7 operational

I do have two DVD devices connected:
/dev/sr0 - USB
/dev/sr1 - true SCSI
the chechsums of the ISO Images copied from the same DVD via /dev/sr0 and via
/dev/sr1 do never match (about 6 copy attempts from each).
used commands:
dd if=/dev/sr0 of=win7a.iso
dd if=/dev/sr1 of=win7b.iso
md5sum win7a.iso
md5sum win7b.iso
sha1sum win7a.iso
sha1sum win7b.iso

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