plymouthd crashed with SIGSEGV in script_obj_deref_direct()

[Carl Stock]

1) Description: Ubuntu Bionic Beaver (development branch)
Release: 18.04

2) plymouth:
  Installed: 0.9.3-1ubuntu1
  Candidate: 0.9.3-1ubuntu1
  Version table:
 *** 0.9.3-1ubuntu1 500
        500 http://gb.archive.ubuntu.com/ubuntu bionic/main amd64 Packages
        100 /var/lib/dpkg/status

3) I expected to see Software Updater because I was checking for updates. This did happen and updates were installed successfully.

4) Instead, this error message appeared about halfway through the update process, immediately following another error message (bug reported just a few minutes ago).

ProblemType: Crash
DistroRelease: Ubuntu 18.04
Package: plymouth 0.9.3-1ubuntu1
ProcVersionSignature: Ubuntu 4.15.0-10.11-generic 4.15.3
Uname: Linux 4.15.0-10-generic x86_64
ApportVersion: 2.20.8-0ubuntu10
Architecture: amd64
BootLog: Error: [Errno 2] No such file or directory: '/var/log/boot.log'
Date: Wed Mar 14 14:33:14 2018
DefaultPlymouth: /usr/share/plymouth/themes/ubuntu-logo/ubuntu-logo.plymouth
ExecutablePath: /sbin/plymouthd
InstallationDate: Installed on 2018-03-07 (6 days ago)
InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Alpha amd64 (20180307)
MachineType: LENOVO 782436G
ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-10-generic root=UUID=8a281633-89dc-47d6-aa0f-3605aeb6205d ro quiet splash vt.handoff=1
ProcCmdline: @sbin/plymouthd --mode=boot --pid-file=/run/plymouth/pid --attach-to-session
ProcEnviron:
 LANG=en_GB.UTF-8
 LANGUAGE=en_GB:en
 PATH=(custom, no user)
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-10-generic root=UUID=8a281633-89dc-47d6-aa0f-3605aeb6205d ro quiet splash vt.handoff=1
SegvAnalysis:
 Segfault happened at: 0x7f8128b66480 <script_obj_deref_direct>: cmpl $0x1,(%rdi)
 PC (0x7f8128b66480) ok
 source "$0x1" ok
 destination "(%rdi)" (0x800000003) not located in a known VMA region (needed writable region)!
SegvReason: writing unknown VMA
Signal: 11
SourcePackage: plymouth
StacktraceTop:
 script_obj_deref_direct () from /usr/lib/x86_64-linux-gnu/plymouth/script.so
 script_obj_as_custom () from /usr/lib/x86_64-linux-gnu/plymouth/script.so
 script_execute_object () from /usr/lib/x86_64-linux-gnu/plymouth/script.so
 script_lib_plymouth_on_update_status () from /usr/lib/x86_64-linux-gnu/plymouth/script.so
 ?? ()
TextPlymouth: /usr/share/plymouth/themes/ubuntu-text/ubuntu-text.plymouth
Title: plymouthd crashed with SIGSEGV in script_obj_deref_direct()
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups:

dmi.bios.date: 12/15/2011
dmi.bios.vendor: LENOVO
dmi.bios.version: 9HKT46AUS
dmi.board.vendor: LENOVO
dmi.chassis.type: 7
dmi.chassis.vendor: To Be Filled By O.E.M.
dmi.chassis.version: To Be Filled By O.E.M.
dmi.modalias: dmi:bvnLENOVO:bvr9HKT46AUS:bd12/15/2011:svnLENOVO:pn782436G:pvrThinkStationE30:rvnLENOVO:rn:rvr:cvnToBeFilledByO.E.M.:ct7:cvrToBeFilledByO.E.M.:
dmi.product.family: To be filled by O.E.M.
dmi.product.name: 782436G
dmi.product.version: ThinkStation E30
dmi.sys.vendor: LENOVO

[Apport retracing service (apport)]

Thank you for taking the time to report this crash and helping to make this software better. This particular crash has already been reported and is a duplicate of bug #927636, so is being marked as such. Please look at the other bug report to see if there is any missing information that you can provide, or to see if there is a workaround for the bug. Additionally, any further discussion regarding the bug should occur in the other report. Please continue to report any other bugs you may find.