plymouthd crashed with SIGSEGV in script_obj_deref_direct()

[Bougron]

For my first connection

ProblemType: Crash
DistroRelease: Ubuntu 18.04
Package: plymouth 0.9.2-3ubuntu17
ProcVersionSignature: Ubuntu 4.13.0-17.20-generic 4.13.8
Uname: Linux 4.13.0-17-generic x86_64
ApportVersion: 2.20.8-0ubuntu5
Architecture: amd64
Date: Thu Dec 21 22:21:51 2017
DefaultPlymouth: /usr/share/plymouth/themes/ubuntu-logo/ubuntu-logo.plymouth
ExecutablePath: /sbin/plymouthd
InstallationDate: Installed on 2017-12-21 (0 days ago)
InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Alpha amd64 (20171219)
MachineType: To Be Filled By O.E.M. To Be Filled By O.E.M.
ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.13.0-17-generic.efi.signed root=UUID=970b8c2c-236c-4aef-a315-78a13d90b325 ro quiet splash vt.handoff=7
ProcCmdline: @sbin/plymouthd --mode=boot --pid-file=/run/plymouth/pid --attach-to-session
ProcEnviron:
 LANG=fr_FR.UTF-8
 PATH=(custom, no user)
ProcFB: 0 radeondrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.13.0-17-generic.efi.signed root=UUID=970b8c2c-236c-4aef-a315-78a13d90b325 ro quiet splash vt.handoff=7
SegvAnalysis:
 Segfault happened at: 0x7fcdbc923434 <script_obj_deref_direct+20>: cmpl $0x1,(%rax)
 PC (0x7fcdbc923434) ok
 source "$0x1" ok
 destination "(%rax)" (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 /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: 01/12/2016
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: P2.00
dmi.board.name: FM2A68M-HD+
dmi.board.vendor: ASRock
dmi.chassis.asset.tag: To Be Filled By O.E.M.
dmi.chassis.type: 3
dmi.chassis.vendor: To Be Filled By O.E.M.
dmi.chassis.version: To Be Filled By O.E.M.
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrP2.00:bd01/12/2016:svnToBeFilledByO.E.M.:pnToBeFilledByO.E.M.:pvrToBeFilledByO.E.M.:rvnASRock:rnFM2A68M-HD+:rvr:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.:
dmi.product.family: To Be Filled By O.E.M.
dmi.product.name: To Be Filled By O.E.M.
dmi.product.version: To Be Filled By O.E.M.
dmi.sys.vendor: To Be Filled By O.E.M.

[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.