[Pkg-systemd-maintainers] Bug#731208: Bug#731208: systemd: fails to boot with encrypted swap

[Gerald Turner]

Michael Stapelberg <stapelberg at debian.org> writes:
> I spent some time today looking into these “systemd fails to boot with
> encrypted swap” problems, and, just as Michael Biebl suggested, this
> indeed seems to be a problem with the dmsetup package. When applying
> this patch, my VM boots just fine with encrypted swap:
>
> --- /lib/udev/rules.d/55-dm.rules 2013-08-07 09:45:01.000000000 -0400
> +++ /root/55-dm.rules             2013-12-08 10:12:48.104015288 -0500
> @@ -98,6 +98,8 @@
>  # and 'DM subsystem' related rules enabled in this case.
>  ENV{DM_SUSPENDED}=="1", ENV{DM_UDEV_DISABLE_OTHER_RULES_FLAG}="1"
>
> +OPTIONS+="watch"
> +
>  GOTO="dm_end"
>
>  LABEL="dm_disable"
>
> Can any of you please confirm that this works for you? I will then ask
> the dmsetup maintainer(s) to fix this on their end.

Verified this patch solved the encrypted swap / systemd hang on the two
machines where I'm having this issue.  Thanks!

> The root cause seems to be that systemd calls mkswap and then waits
> for an event to continue with the swapon command, but never gets the
> event. Fedora/RHEL has fixed this by adding a rules file to enable the
> watch option, but unfortunately the Debian dmsetup package does not
> use the upstream rules files at all :-|.
>
> See also those reports for Fedora/RHEL:
> https://bugzilla.redhat.com/show_bug.cgi?id=759402
> https://bugzilla.redhat.com/show_bug.cgi?id=711394

-- 
Gerald Turner   Email: gturner at unzane.com   JID: gturner at unzane.com
GPG: 0xFA8CD6D5  21D9 B2E8 7FE7 F19E 5F7D  4D0C 3FA0 810F FA8C D6D5
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