On Wed, 08.06.16 18:48, Florent Peterschmitt ([email protected]) wrote:

> Each time i boot, this error happen:
> # journalctl -xe
> [...]
> systemd[1]: dev-mapper-root.device: Job dev-mapper-root.device/start timed 
> out.
> systemd[1]: Timed out waiting for device /dev/mapper/root.
> [...]

This appears unrelated to the fact that btrfs is used, and most likely
is caused by borked DM logic. Maybe you built the DM tools without
proper udev support? They used to have a compile-time option there,
which defaulted to off, which makes DM incompatible with systemd. Most
distributions don't bother, and always set it, but given that you use
Gentoo I figure yours might not, dunno.

Lennart

-- 
Lennart Poettering, Red Hat
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