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If you pass a root= argument with a numeric device number (i.e. root=0806), that's currently resolved by running mknod to create a /dev/root device with an appropriate major/minor number and setting ROOT=/dev/root (the parse_numeric function in scripts/functions). However, this /dev/root device is completely unknown to udev. On Ubuntu, this leads to problems because we use udev to wait for the root device to appear. Since /dev/root isn't in udev's database, the boot hangs forever (well, it hangs until rootdelay passes). udev's standard configuration creates /dev/block/N:N symlinks for every block device in its database (see the first non-comment line of /lib/udev/rules.d/50-udev-default.rules). Setting ROOT to the /dev/block/N:N symlink instead of creating a new /dev/root device and setting ROOT to that solves Ubuntu's problem. See https://bugs.launchpad.net/bugs/576429 for more discussion. I think I actually want to take a different approach in order to maintain the current semantics of setting root=X:Y. In particular, if the user passes in a value that has a prefixed 0, that will get passed directly to mknod, which would treat the number as octal. So root=010:0 would actually create a device with major number 8. Instead of trying to resolve this directly, we can use the shell's arithmetic expansion to get a decimal number back. Closes: #606806 [ change condition from specific udev script to udevd availability. ] Signed-off-by: maximilian attems <max@stro.at> Reviewed-by: Michael Prokop <mika@debian.org>