[Bug 927636] Re: plymouthd crashed with SIGSEGV in script_obj_deref_direct()

[PJSingh5000]

On Ubuntu 17.10...

TEST 1 - NO ISSUE:

1. Set onboard graphics as primary in BIOS.
2. Logged into Ubuntu.
3. Everything was fine.
4. Restarted machine.

TEST 2 - ISSUE:

1. Set GeForce GTX 670 in BIOS.
2. Logged into Ubuntu 17.10.
3. Surprisingly, I was given option of "GNOME" or "GNOME Xorg" in GDM.
   (Note: GNOME == Wayland)
4. Selected GNOME on GDM
5. Logged into Ubuntu.
6. Received this error.

7. Checked which display server is in use:
     $ echo $XDG_SESSION_TYPE
     x11
   (Note: x11 == Xorg, non-Wayland)
   This makes sense because Ubuntu defaults to Xorg for Nvidia cards.


QUESTIONS:

1. Perhaps unrelated, but why is GDM even presenting me with a Wayland
option when the graphics card is Nvidia?

2. Does this bug occur whenever Ubuntu decide to chose an Xorg session
over a Wayland session? (I see this bug is pretty old, pre-Wayland, but
thought it's worth asking).


INFO:

Linux PS001 4.13.0-16-generic #19-Ubuntu SMP Wed Oct 11 18:35:14 UTC
2017 x86_64 x86_64 x86_64 GNU/Linux

No LSB modules are available.
Distributor ID:	Ubuntu
Description:	Ubuntu 17.10
Release:	17.10
Codename:	artful

plymouth 0.9.2-3ubuntu17 amd64

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https://bugs.launchpad.net/bugs/927636

Title:
  plymouthd crashed with SIGSEGV in script_obj_deref_direct()

Status in Plymouth:
  Confirmed
Status in plymouth package in Ubuntu:
  Triaged

Bug description:
  Ubuntu 12.04 LTS (development branch)

  ProblemType: Crash
  DistroRelease: Ubuntu 12.04
  Package: plymouth 0.8.2-2ubuntu28
  ProcVersionSignature: Ubuntu 3.2.0-14.23-generic 3.2.3
  Uname: Linux 3.2.0-14-generic x86_64
  NonfreeKernelModules: fglrx
  ApportVersion: 1.91-0ubuntu1
  Architecture: amd64
  Date: Mon Feb  6 07:03:15 2012
  DefaultPlymouth: /lib/plymouth/themes/xubuntu-logo/xubuntu-logo.plymouth
  ExecutablePath: /sbin/plymouthd
  MachineType: Foxconn AMD HDZS01
  ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-14-generic root=UUID=0bb93586-7343-45bd-802b-03adbb46f430 ro quiet splash vt.handoff=7
  ProcCmdline: /sbin/plymouthd --mode=boot --attach-to-session
  ProcEnviron: PATH=(custom, no user)
  ProcFB: 0 VESA VGA
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-14-generic root=UUID=0bb93586-7343-45bd-802b-03adbb46f430 ro quiet splash vt.handoff=7
  SegvAnalysis:
   Segfault happened at: 0x7effe6b50ea0 <script_obj_deref_direct>:	cmpl   $0x1,(%rdi)
   PC (0x7effe6b50ea0) ok
   source "$0x1" ok
   destination "(%rdi)" (0x00000000) not located in a known VMA region (needed writable region)!
  SegvReason: writing NULL VMA
  Signal: 11
  SourcePackage: plymouth
  StacktraceTop:
   script_obj_deref_direct () from /lib/plymouth/script.so
   script_obj_as_custom () from /lib/plymouth/script.so
   script_execute_object () from /lib/plymouth/script.so
   script_lib_plymouth_on_update_status () from /lib/plymouth/script.so
   ?? ()
  TextPlymouth: /lib/plymouth/themes/xubuntu-text/xubuntu-text.plymouth
  Title: plymouthd crashed with SIGSEGV in script_obj_deref_direct()
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups:
   
  dmi.bios.date: 04/19/2011
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: A93F1022
  dmi.board.asset.tag: To be filled by O.E.M.
  dmi.board.name: AHD1S
  dmi.board.vendor: Foxconn
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrA93F1022:bd04/19/2011:svnFoxconn:pnAMDHDZS01:pvrTobefilledbyO.E.M.:rvnFoxconn:rnAHD1S:rvr:
  dmi.product.name: AMD HDZS01
  dmi.product.version: To be filled by O.E.M.
  dmi.sys.vendor: Foxconn

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