unbound hangs at bootup

Unbound hangs rather than starting, causing openrc's startup to hang, preventing bootup completion, and therefore preventing a shell prompt.

Normality is resumed by uncommenting this line in /etc/conf.d/unbound:

supervisor=supervise-daemon

(I got a shell prompt by appending init=/bin/sh to the kernel commandline, and using e.g. mount -o remount,rw / ).

Whilst recovering, I had the following observations:

• openrc's softlevel= kernel commandline options don't seem to have any effect in Alpine
• openrc doesn't seem to have any timeout on service startup