I've managed to reproduce in 4.4, 4.15, 5.4 (all from Ubuntu releases) and 5.7-rc4-next; also, I think bare-metal usually doesn't reproduce.
Seems like a live-lock situation, I'll attach some calltraces I gathered using sysrqs. Cheers, Guilherme -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1879987 Title: kernel get stuck at boot if specified 'console=ttyS* ' doesn't exist. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1879987/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs