Red Hat Bugzilla – Bug 536676
incomplete/truncated initrd when /boot is very close to full
Last modified: 2010-12-03 22:24:27 EST
I attempted to preupgrade from F11 to F12 (currently rawhide) on a KVM guest with a very full /boot.
(Note that due to the increased size of the F12 installer images and dracut-created initrd, this is a fairly common case.)
Since /boot was so close to full, anaconda at first refused to perform the upgrade, saying 8MB more space was needed. After running 'tune2fs -r 0 /dev/vda1' anaconda ran successfully. There were no scriptlet errors in /root/upgrade.log.
On reboot, the following messages appeared:
RAMDISK: incomplete write (22893 != 32768)
Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0)
which seems to indicate a problem unpacking/finding the initrd. I retrieved the initrd and attempted to examine it, which led to some gzip/cpio errors:
gzip: /tmp/initramfs-126.96.36.199-127.fc12.x86_64.img: invalid compressed data--crc error
gzip: /tmp/initramfs-188.8.131.52-127.fc12.x86_64.img: invalid compressed data--length error
cpio: premature end of file
My guess is that some part of the initrd creation process did not check for sufficient free space and/or ignored an error about running out of space on the device.
With a /boot filesystem it is too easy to end up with
a bad upgrade for want of space.
preupgrade-gtk and friends should check if /boot is
an isolated filesystem and then check if it has sufficient
space for preupgrade tricks.
This applies to both a fc10-2-fc11 and an fc11-2-fc12 upgrade.
With changes to grub and since this is an easy check and
since failure to notice the problem results in a badly broken
system the priority should be improved.
Example of what used to be a 'big enough' /boot
and why it is not.
$ df -h
Filesystem Size Used Avail Use% Mounted on
273G 130G 129G 51% /
tmpfs 1.8G 276K 1.8G 1% /dev/shm
20G 189M 19G 2% /tmp
/dev/sda1 190M 158M 23M 88% /boot
$ du -s /boot/*
This package has changed ownership in the Fedora Package Database. Reassigning to the new owner of this component.
Still happens preupgrade-1.1.5-1.fc12.
but see bug 573451
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