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

[Alessandro Astone]

In case no DRM driver is available then plymouth can also drive a
framebuffer directly. That is what I believe might be happening, just
from reading this thread.

It's possible that the framebuffer backend is not as well tested, and
does not work reliably. Because normally most systems would use the DRM
backend.

> -usr/lib/modules/6.14.0-11-generic/kernel/drivers/gpu/drm/drm_dma_helper.ko.zst
> -usr/lib/modules/6.14.0-11-generic/kernel/drivers/gpu/drm/drm_mipi_dbi.ko.zst
> -usr/lib/modules/6.14.0-11-generic/kernel/drivers/gpu/drm/drm_ttm_helper.ko.zst
> -usr/lib/modules/6.14.0-11-generic/kernel/drivers/gpu/drm/drm_vram_helper.ko.zst

I wonder if SimpleDRM requires any of those helpers? Does the kernel
build system even allow a built-in module to depend on an externally
loaded module?

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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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