[Bug 962764] Re: initramfs rescue prompt blocked by splash screen

[Dominic Gross]

*** This bug is a duplicate of bug 864466 ***
    https://bugs.launchpad.net/bugs/864466

Not so sure this is a duplicate. There are certainly a lot of strange
effects on precise related to the rescue shell when PXE booting with NFS
root device. Changing the gfxpayload as mentioned in #864466 has no
effect here.

I am booting precise via PXE with NFS root device and can't get to a
initramfs rescue prompt at all after a certain point in the boot
process. Basically I want to drop into busybox shell in my aufs /
overlayfs script to analyze some problems. I tried to open a shell in
the relevant script (in nfs-bottom) as well as the break=bottom option
and the rescue shell is always blocked by the splash screen (with quiet
and splash removed, also tried nosplash).

If I use break=top (again without quiet and splash) I can get to a
rescue shell on some machines, on other machines I can see the
(initramfs) prompt, then some more kernel messages appear and everything
blocks. On an almost identical local installation (local disk and users
instead of LDAP/Kerberos/NFS) the break option works fine. I am not sure
I fully understand what is going on here and want to make sure that I
have a better idea of what is going on before filing a bug report.

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https://bugs.launchpad.net/bugs/962764

Title:
  initramfs rescue prompt blocked by splash screen

Status in “kbd” package in Ubuntu:
  New

Bug description:
  In precicse, when the splash screen is enabled, a boot failure that lands you at the initramfs emergency shell is not shown.  To reproduce, just edit the boot line at the grub prompt and change the root UUID.  If you remove the splash argument, you get the initramfs rescue shell like you should, if you do not, then you are just stuck at the blank plymouth splash screen forever.
  --- 
  ApportVersion: 2.0-0ubuntu2
  Architecture: amd64
  DefaultPlymouth: /lib/plymouth/themes/ubuntu-logo/ubuntu-logo.plymouth
  DistroRelease: Ubuntu 12.04
  InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Beta amd64 (20120402)
  MachineType: System manufacturer System Product Name
  Package: plymouth 0.8.2-2ubuntu28
  PackageArchitecture: amd64
  ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-21-generic root=UUID=72902dde-cab0-4886-8021-70666d3a356d ro quiet splash vt.handoff=7
  ProcEnviron:
   TERM=xterm
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 radeondrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-21-generic root=UUID=72902dde-cab0-4886-8021-70666d3a356d ro quiet splash vt.handoff=7
  ProcVersionSignature: Ubuntu 3.2.0-21.34-generic 3.2.13
  Tags:  precise
  TextPlymouth: /lib/plymouth/themes/ubuntu-text/ubuntu-text.plymouth
  Uname: Linux 3.2.0-21-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  dmi.bios.date: 08/15/2011
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 1904
  dmi.board.asset.tag: To be filled by O.E.M.
  dmi.board.name: P8P67 PRO REV 3.1
  dmi.board.vendor: ASUSTeK Computer INC.
  dmi.board.version: Rev 1.xx
  dmi.chassis.asset.tag: Asset-1234567890
  dmi.chassis.type: 3
  dmi.chassis.vendor: Chassis Manufacture
  dmi.chassis.version: Chassis Version
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr1904:bd08/15/2011:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKComputerINC.:rnP8P67PROREV3.1:rvrRev1.xx:cvnChassisManufacture:ct3:cvrChassisVersion:
  dmi.product.name: System Product Name
  dmi.product.version: System Version
  dmi.sys.vendor: System manufacturer

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