init hangs when debug is specified

[Bas Zoetekouw]

When specifying "debug" on the kernel command line in order to catch initramfs debug info, the init hangs. It's quite early in the boot process (certainly before pre-mount is called, as I don't see anything relating to btrfs scan and resuming from hibernation).

╰─▶ uname -a
Linux regan 5.0.0-13-generic #14-Ubuntu SMP Mon Apr 15 14:59:14 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux

╰─▶ dpkg -l initramfs-tools
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name Version Architecture Description
+++-===============-============-============-================================================
ii initramfs-tools 0.133ubuntu2 all generic modular initramfs generator (automation)

╰─▶ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu Eoan Ermine (development branch)
Release: 19.10
Codename: eoan