Public bug reported:
Binary package hint: os-prober
The reported version of os-prober uses mount to mount all block devices
in our system. Those block devices are connected iSCSI devices that are
used by KVM virtual machines as their root partition. The mount will
perform a read-write mount shortly to fsck the device, crippling the
root partitions this way. This is confirmed by the man page of mount:
Note that, depending on the filesystem type, state and kernel
behavior, the system may still write to the
device. For example, Ext3 or ext4 will replay its journal if the
filesystem is dirty. To prevent this kind
of write access, you may want to mount ext3 or ext4 filesystem
with "ro,noload" mount options or set the
block device to read-only mode, see command blockdev(8).
Newer versions of the script (I've looked at 1.47) use blockdev --setro
to disable this behaviour. However, doing that will also disable writes
for the KVM machines. The guest operating system will not recover from
this, even after setting blockdev --setrw again.
The proper way to do things would probably be to use the '-o ro,noload'
flag for mount, as documented in the man page and as proposed in the
earlier version of this bug: http://bugs.debian.org/cgi-
bin/bugreport.cgi?bug=556739
ProblemType: Bug
DistroRelease: Ubuntu 10.04
Package: os-prober 1.38
ProcVersionSignature: Ubuntu 2.6.32-26.48-server 2.6.32.24+drm33.11
Uname: Linux 2.6.32-26-server x86_64
Architecture: amd64
Date: Wed Jun 15 09:02:56 2011
InstallationMedia: Ubuntu-Server 10.04 LTS "Lucid Lynx" - Release amd64
(20100427)
ProcEnviron:
LANG=en_US.UTF-8
SHELL=/bin/bash
SourcePackage: os-prober
** Affects: os-prober (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug lucid
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https://bugs.launchpad.net/bugs/797547
Title:
os-prober interrupts device connection of kvm machines
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