Package: initramfs-tools
Version: 0.120
Severity: important
Dear Maintainer,
I have a hard time wrapping my head around this bug, feel free to assign
somewhere
else.
We have started upgrading some of our production VMs to Jessie. The testsystems
worked
fine, but I have hit the following bug for the second time on a production VM
now.
- dist-upgrade works flawlessly
- on first boot into Jessie I get an immediate (<1s) kernel-panic (see attached
screenshot) about being unable to find the root fs. Unfortunately I'm unable
to
get the full boot log, since I don't have a serial console there and kernel
messages scroll by too fast.
- To fix the issue I have to boot into the old Wheezy kernel (3.2.0-4-amd64) in
grub and regenerate the initrd for the Jessie kernel
# update-initramfs -k 3.16.0-4-amd64 -u
Then it works fine.
Now comes the interesting part ... I have saved the broken initrd for later
analysis
The compressed size is marginally different (broken being 3k smaller)
-rw-r--r-- 1 root root 14339199 Apr 28 13:59 initrd.img-3.16.0-4-amd64
-rw-r--r-- 1 root root 14338898 Apr 28 13:58 initrd.img-3.16.0-4-amd64.broken
The uncompressed size is the same
root@lxmhs63:/tmp# zcat /boot/initrd.img-3.16.0-4-amd64.broken >
initrd.img-3.16.0-4-amd64.broken
root@lxmhs63:/tmp# zcat /boot/initrd.img-3.16.0-4-amd64.broken >
/tmp/initrd.img-3.16.0-4-amd64.broken
root@lxmhs63:/tmp# ls -la /tmp/initrd.img-3.16.0-4-amd64*
-rw-r--r-- 1 root root 45304832 Apr 28 14:44 /tmp/initrd.img-3.16.0-4-amd64
-rw-r--r-- 1 root root 45304832 Apr 28 14:44
/tmp/initrd.img-3.16.0-4-amd64.broken
The checksum is different
root@lxmhs63:/tmp# md5sum /tmp/initrd.img-3.16.0-4-amd64*
7b24aa901b697dc5dfdbad03bd199072 /tmp/initrd.img-3.16.0-4-amd64
5e467c0a49afa4ddae315cc6e818d7ac /tmp/initrd.img-3.16.0-4-amd64.broken
Now comes the puzzling part ... the _content_ of the initrd is exactly the same
root@lxmhs63:/tmp# mkdir broken && cd broken && cpio -id <
../initrd.img-3.16.0-4-amd64.broken
88486 blocks
root@lxmhs63:/tmp/broken# cd ..
root@lxmhs63:/tmp# mkdir ok && cd ok && cpio -id < ../initrd.img-3.16.0-4-amd64
88486 blocks
root@lxmhs63:/tmp/ok# cd ..
root@lxmhs63:/tmp# diff -urN broken ok
I will try to capture a screenlog on the next upgrades, maybe there is
something
interesting in there.
Bernhard
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