Package: kvm
Version: 72+dfsg-5~lenny1
Severity: important

Sometimes, rebooting a kvm guest panics early in booting:
RAMDISK: Compressed image found at block 0
RAMDISK: incomplete write (-28 != 32768) 8388608
invalid compressed format (err=1)
List of all partitions:
No filesystem cound mount root, tried:
Kernel panic - not syncing: VFS: Unable to mount root fs on
  unknown-block(0,0)

I have seen this problem after a kernel update in the guest. Most of the
time, I can trigger it by rebuilding the initrd of the newest kernel
installed, e.g.:
dpkg-reconfigure linux-image-2.6.26-2-686
init 6

I can then kill the kvm process and start a new one, and it boots happily. I
tried a lenny guest (i386) on a lenny host (amd64), with an IDE drive (hda),
not virtio_blk (vda). virtio_blk is nice, but I have to support IDE because
there are guests here without virtio_blk.

Downgrading kvm to version 72+dfsg-4 solves this problem for me. So it looks
like the fix for bug #506972 (debian/patches/restore_option_roms.patch: "fix
hang on reboot with virtio") introduced a regression.

I googled a bit and stumpled upon this, maybe it is related:
http://osdir.com/ml/fedora-extras-commits/2009-05/msg03765.html

I thought it might be a good idea to put some people in cc that were
involved in the mentioned bug, I hope this is ok for them.



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