Bug#783620: initramfs-tools: initramfs broken on first boot into Jessie, "Unable to mount root fs on unknown-block(0, 0)"
On Wed, Apr 29, 2015 at 01:06:07PM +0200, Bernhard Schmidt wrote:
> Hi,
>
> [ copied from debian-user again ]
>
> ---
> Got another system with the symptoms and managed to get a snapshot.
>
> It is really extremely weird. The kernel output is
>
> List of all partitions:
> No filesystem could mount root, tried:
> Kernel panic - not syncing: VFS: Unable to mount root fs on
> unknown-block(0,0)
>
> This is reproducible. To fix it it is enough to boot into the Wheezy
> kernel (even with init=/bin/sh), then reboot. It apparently does
> something to the root-fs (fsck?) which allows the Jessie kernel to boot.
>
> I have asked our Windows guys to make a screencast, it is uploaded here.
>
> http://users.birkenwald.de/~berni/volatile/783620.mkv
>
> We still have the snapshot available, if you have an idea please drop me
> a note.
this means linux didn't get the initramfs passed by the bootloader.
In the old days this happened when lilo was not run, these days it could
be some grub modules out of sync (very wild guess).
did you try before botting into that image to run install-grub in it?
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