plymouthd crashed with SIGSEGV in script_obj_deref_direct()

[Paul S]

Got this error after
sudo apt update
sudo apt dist-upgrade

using a lenovo thinkpad480s with docking. BuiltIn Display is disabled, only the (single) monitor on the dock is used.

ProblemType: Crash
DistroRelease: Ubuntu 18.04
Package: plymouth 0.9.3-1ubuntu6
ProcVersionSignature: Ubuntu 4.15.0-15.16-generic 4.15.15
Uname: Linux 4.15.0-15-generic x86_64
ApportVersion: 2.20.9-0ubuntu5
Architecture: amd64
Date: Wed Apr 18 10:02:42 2018
DefaultPlymouth: /usr/share/plymouth/themes/ubuntu-logo/ubuntu-logo.plymouth
ExecutablePath: /sbin/plymouthd
InstallationDate: Installed on 2018-04-09 (8 days ago)
InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Beta amd64 (20180404)
MachineType: LENOVO 20L7CTO1WW
ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-15-generic root=UUID=7b3b4a92-97f9-49e1-a3f1-49e1ae2ad682 ro quiet splash vt.handoff=1
ProcCmdline: @sbin/plymouthd --mode=boot --pid-file=/run/plymouth/pid --attach-to-session
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-15-generic root=UUID=7b3b4a92-97f9-49e1-a3f1-49e1ae2ad682 ro quiet splash vt.handoff=1
SegvAnalysis:
 Segfault happened at: 0x7efe1dbf2480 <script_obj_deref_direct>: cmpl $0x1,(%rdi)
 PC (0x7efe1dbf2480) ok
 source "$0x1" ok
 destination "(%rdi)" (0x00000020) not located in a known VMA region (needed writable region)!
SegvReason: writing NULL 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_display_normal () from /usr/lib/x86_64-linux-gnu/plymouth/script.so
 ?? () 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: 03/13/2018
dmi.bios.vendor: LENOVO
dmi.bios.version: N22ET34W (1.11 )
dmi.board.asset.tag: Not Available
dmi.board.name: 20L7CTO1WW
dmi.board.vendor: LENOVO
dmi.board.version: SDK0J40709 WIN
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: None
dmi.modalias: dmi:bvnLENOVO:bvrN22ET34W(1.11):bd03/13/2018:svnLENOVO:pn20L7CTO1WW:pvrThinkPadT480s:rvnLENOVO:rn20L7CTO1WW:rvrSDK0J40709WIN:cvnLENOVO:ct10:cvrNone:
dmi.product.family: ThinkPad T480s
dmi.product.name: 20L7CTO1WW
dmi.product.version: ThinkPad T480s
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 #1745406, 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.