[Bug 2103798] Re: go backtrace during boot, can't boot

[Daniel van Vugt]

As Alessandro alluded to in comment #24, Plymouth using a "framebuffer"
(or rather 'fbdev') is probably what's happening. Such raw framebuffers
could be overwritten by other processes without the exclusive rights
over the display that a full DRM driver gives you.

The thing is, using fbdev ("framebuffer") is by design. We only want
simple framebuffer drivers in early boot because full DRM drivers are
getting too big and too slow to load (like 10 seconds to initialize).

The only non-compromising solution I can think of here is to prevent the
crash from happening in the first place. As a second choice, the log
level used for such crashes could be lowered so as to stay under the
"quiet" threshold and never written to the console.

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https://bugs.launchpad.net/bugs/2103798

Title:
  go backtrace during boot, can't boot

Status in dracut package in Ubuntu:
  New

Bug description:
  I'm using dracut with plucky. When I reboot, I briefly see the
  passphrase prompt for the disk encryption, but I don't have time to
  type it completely. Midtype, the screen gets filled with a golang
  backtrace, and boot stops.

  The only way to boot this system (that I have found) is to edit the
  grub entry and remove "quiet splash".

  ProblemType: Bug
  DistroRelease: Ubuntu 25.04
  Package: dracut 106-2ubuntu3
  ProcVersionSignature: Ubuntu 6.14.0-11.11-generic 6.14.0-rc7
  Uname: Linux 6.14.0-11-generic x86_64
  NonfreeKernelModules: zfs
  ApportVersion: 2.32.0-0ubuntu2
  Architecture: amd64
  CasperMD5CheckResult: pass
  CurrentDesktop: ubuntu:GNOME
  Date: Fri Mar 21 09:20:23 2025
  DracutModulesPackages: dracut-core 106-2ubuntu3
  InstallationDate: Installed on 2024-05-20 (305 days ago)
  InstallationMedia: Ubuntu 24.04 LTS "Noble Numbat" - Release amd64 (20240424)
  PackageArchitecture: all
  SourcePackage: dracut
  UpgradeStatus: Upgraded to plucky on 2025-02-09 (40 days ago)

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