plymouthd crashed with SIGSEGV in script_obj_deref_direct()

[Jane Doe]

ubuntu 18.04 distupgrade from 16.04 @ dell xps 12

ProblemType: Crash
DistroRelease: Ubuntu 18.04
Package: plymouth 0.9.3-1ubuntu6
ProcVersionSignature: Ubuntu 4.15.0-13.14-generic 4.15.10
Uname: Linux 4.15.0-13-generic x86_64
ApportVersion: 2.20.9-0ubuntu4
Architecture: amd64
CrashCounter: 1
Date: Fri Apr 6 22:46:10 2018
DefaultPlymouth: /usr/share/plymouth/themes/ubuntu-logo/ubuntu-logo.plymouth
ExecutablePath: /sbin/plymouthd
InstallationDate: Installed on 2018-03-11 (26 days ago)
InstallationMedia: Ubuntu 16.04.4 LTS "Xenial Xerus" - Release amd64 (20180228)
MachineType: Dell Inc. XPS 12 9Q23
ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-13-generic root=UUID=e8186b16-2ca7-47a4-a261-792524adbc6b ro quiet splash i8042.direct i8042.dumbkbd vt.handoff=1
ProcCmdline: @sbin/plymouthd --mode=boot --pid-file=/run/plymouth/pid --attach-to-session
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-13-generic root=UUID=e8186b16-2ca7-47a4-a261-792524adbc6b ro quiet splash i8042.direct i8042.dumbkbd vt.handoff=1
SegvAnalysis:
 Segfault happened at: 0x7f2d586be480 <script_obj_deref_direct>: cmpl $0x1,(%rdi)
 PC (0x7f2d586be480) ok
 source "$0x1" ok
 destination "(%rdi)" (0xffffffff) 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_boot_progress () from /usr/lib/x86_64-linux-gnu/plymouth/script.so
 ?? () from /lib/x86_64-linux-gnu/libply-splash-core.so.4
TextPlymouth: /usr/share/plymouth/themes/ubuntu-text/ubuntu-text.plymouth
Title: plymouthd crashed with SIGSEGV in script_obj_deref_direct()
UpgradeStatus: Upgraded to bionic on 2018-03-11 (26 days ago)
UserGroups:

dmi.bios.date: 12/07/2012
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A05
dmi.board.asset.tag: 0004061282
dmi.board.name: 0520M8
dmi.board.vendor: Dell Inc.
dmi.board.version: A00
dmi.chassis.asset.tag: 0004061282
dmi.chassis.type: 8
dmi.chassis.vendor: Dell Inc.
dmi.chassis.version: A05
dmi.modalias: dmi:bvnDellInc.:bvrA05:bd12/07/2012:svnDellInc.:pnXPS129Q23:pvrA05:rvnDellInc.:rn0520M8:rvrA00:cvnDellInc.:ct8:cvrA05:
dmi.product.family: 103C_5335KV
dmi.product.name: XPS 12 9Q23
dmi.product.version: A05
dmi.sys.vendor: Dell Inc.

[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 #1580078, 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.