unity-panel-service crashed with SIGSEGV in ffi_call_unix64()

Got this apport crash notification very soon after upgrading from 15.04 to 15.10.

ProblemType: Crash
DistroRelease: Ubuntu 15.10
Package: unity-services 7.3.2+15.10.20150921-0ubuntu1
ProcVersionSignature: Ubuntu 4.2.0-11.13-generic 4.2.1
Uname: Linux 4.2.0-11-generic x86_64
NonfreeKernelModules: wl
.tmp.unity.support.test.0:

ApportVersion: 2.19-0ubuntu1
Architecture: amd64
CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
CompositorRunning: compiz
CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
CompositorUnredirectFSW: true
CurrentDesktop: Unity
Date: Tue Sep 29 10:21:35 2015
DistUpgraded: 2015-09-29 08:22:25,147 DEBUG running apport_crash()
DistroCodename: wily
DistroVariant: ubuntu
DkmsStatus:
 bcmwl, 6.30.223.248+bdcom, 4.2.0-11-generic, x86_64: installed
 virtualbox, 5.0.4, 3.19.0-28-generic, x86_64: installed
 virtualbox, 5.0.4, 4.2.0-11-generic, x86_64: installed
ExecutablePath: /usr/lib/unity/unity-panel-service
GraphicsCard:
 Intel Corporation Haswell-ULT Integrated Graphics Controller [8086:0a16] (rev 09) (prog-if 00 [VGA controller])
   Subsystem: Acer Incorporated [ALI] Device [1025:079b]
   Subsystem: Acer Incorporated [ALI] Device [1025:079b]
MachineType: Acer Aspire V5-573G
ProcCmdline: /usr/lib/unity/unity-panel-service
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.2.0-11-generic root=/dev/mapper/vg5-ubuntu ro quiet splash vt.handoff=7
SegvAnalysis:
 Segfault happened at: 0x7fcc3685e3ec: mov (%rdi),%rbx
 PC (0x7fcc3685e3ec) ok
 source "(%rdi)" (0x00000000) not located in a known VMA region (needed readable region)!
 destination "%rbx" ok
SegvReason: reading NULL VMA
Signal: 11
SourcePackage: unity
StacktraceTop:
 ?? () from /usr/lib/x86_64-linux-gnu/libgtk-3.so.0
 ffi_call_unix64 () from /usr/lib/x86_64-linux-gnu/libffi.so.6
 ffi_call () from /usr/lib/x86_64-linux-gnu/libffi.so.6
 g_cclosure_marshal_generic () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
 g_closure_invoke () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
Title: unity-panel-service crashed with SIGSEGV in ffi_call_unix64()
UpgradeStatus: Upgraded to wily on 2015-09-29 (0 days ago)
UserGroups: adm cdrom dialout dip libvirtd lpadmin plugdev sambashare sudo video wireshark
dmi.bios.date: 11/28/2013
dmi.bios.vendor: Insyde Corp.
dmi.bios.version: V2.25
dmi.board.asset.tag: Type2 - Board Asset Tag
dmi.board.name: Dazzle_HW
dmi.board.vendor: Acer
dmi.board.version: Type2 - A01 Board Version
dmi.chassis.type: 10
dmi.chassis.vendor: Chassis Manufacturer
dmi.chassis.version: Chassis Version
dmi.modalias: dmi:bvnInsydeCorp.:bvrV2.25:bd11/28/2013:svnAcer:pnAspireV5-573G:pvrTBDbyOEM:rvnAcer:rnDazzle_HW:rvrType2-A01BoardVersion:cvnChassisManufacturer:ct10:cvrChassisVersion:
dmi.product.name: Aspire V5-573G
dmi.product.version: TBD by OEM
dmi.sys.vendor: Acer
version.compiz: compiz 1:0.9.12.2+15.10.20150908-0ubuntu1
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.64-1
version.libgl1-mesa-dri: libgl1-mesa-dri 11.0.0-1ubuntu1
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 11.0.0-1ubuntu1
version.xserver-xorg-core: xserver-xorg-core 2:1.17.2-1ubuntu7
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.9.2-1ubuntu1
version.xserver-xorg-video-ati: xserver-xorg-video-ati N/A
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917+git20150808-0ubuntu2
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.11-1ubuntu3
xserver.bootTime: Tue Sep 29 09:44:08 2015
xserver.configfile: default
xserver.errors:
 Failed to load module "nvidia" (module does not exist, 0)
 Failed to load module "nvidia" (module does not exist, 0)
 NOUVEAU(G0): Failed to initialise context object: 2D_NVC0 (0)
 NOUVEAU(G0): Error initialising acceleration. Falling back to NoAccel
xserver.logfile: /var/log/Xorg.0.log
xserver.outputs:
 product id 4845
 vendor AUO
xserver.version: 2:1.17.2-1ubuntu7