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

[Guilherme G. Piccoli]

*** This bug is a duplicate of bug 1573095 ***
    https://bugs.launchpad.net/bugs/1573095

Eric, I'll close this LP as dup of #1879987 - seems it's the same issue.
I'll try also the Debian release top see what's different there...we can
comment in the other bug about Debian status and what are the
differences.

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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