Kernel panic with geninitrd and root=/dev/vgname/lvname

[Elan Ruusamäe]

On 13.05.2014 02:33, Łukasz Krotowski wrote:
> Hi,
> our geninitrd in function initrd_gen_setrootdev() tries to fill
> /proc/sys/kernel/real-root-dev based on /proc/partitions. But, when
> booted with root=/dev/vgname/lvname:
> - /proc/sys/kernel/real-root-dev is already filled with proper number
> by initrd_gen_lvm(),
> - /proc/partitions contains dm-X not vgname/lvname hence root device
> is not found. And that causes panic.
>
> My local fix is:
> + if [ "$(busybox cat /proc/sys/kernel/real-root-dev)" -eq 0 -a
> "${ROOT##/dev/}" != "${ROOT}" ]; then
> - if [ "${ROOT##/dev/}" != "${ROOT}" ]; then
>
> Since I don't know how to change geninitrd I'm signaling this issue
> here. FWIW I use geninitrd with --initrdfs=rom.

seems the bug doesn't exist with --initrdfs=initramfs

and the problem is that busybox 1.21 -> 1.22 ls -l format has changed, 
so the unreliable fallback to ls -l, reading minor-major of 254,0 it 
gets 0,0

-- 
glen

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