I started writing my comment before you posted your log output. That's
why I saw it only afterwards.
I tracked it down to: /usr/lib/dhcpcd/dhcpcd-run-hooks ->
/usr/lib/dhcpcd/dhcpcd-hooks/30-hostname -> need_hostname function:
```
is_default_hostname "$hostname" && return 0
```
/usr/lib/dhcpcd/dhcpcd-hooks/10-mtu calls "set -e" which is still
present when sourcing /usr/lib/dhcpcd/dhcpcd-hooks/30-hostname.
Distilled down `test` shell code:
```
#!/bin/sh
set -e
need_hostname()
{
false && return 0
echo "remaining"
}
need_hostname
```
busybox behaves differently than dash in that case:
```
$ sh test; echo $?
remaining
0
$ busybox test; echo $?
1
```
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https://bugs.launchpad.net/bugs/2064926
Title:
dhcpcd stuck for 5 Minutes (300 Seconds) during Boot Process
(LUKS/Clevis Autounlock)
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