[Bug 1879987] Re: machine get stuck at boot if specified 'console=ttyS* ' doesn't exist.

[Guilherme G. Piccoli]

This was greatly debugged by LP user WGH in https://bugs.launchpad.net
/cloud-images/+bug/1573095/comments/46 - it's really a flaw on
initramfs, I managed to workaround the issue with "quiet" parameter
(system boots normally ,even with the wrong serial console).

Investigation continues... I guess this LP may end-up being a duplicate of 1573095.
Thanks,


Guilherme

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https://bugs.launchpad.net/bugs/1879987

Title:
  machine get stuck at boot if specified 'console=ttyS* ' doesn't exist.

Status in initramfs-tools package in Ubuntu:
  Confirmed
Status in linux package in Ubuntu:
  Incomplete

Bug description:
  kernel get stucks at boot if console=ttyS* is specified in the kernel
  cmdline and that serial HW isn't available on the system.

  Reproduced with:
  4.4 (from Xenial), 4.15 (from Bionic), 5.4 (native, Focal) and 5.7-next (mainline)

  Removing the non-existent 'console=ttyS*' parameter fixes the
  situation.

  I tested it using KVM/qemu, but it has been brought to my attention
  that it was reproducible in VMware as well.

  I think it is safe to say that it is unlikely to be specifics to a
  certain virtualization technology type.

  Didn't test on baremetal yet.

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