compiz crashed with SIGSEGV in g_bit_lock()

[fjgaude]

When clicking on Launch icon drives to "unlock from launcher" system locks for five or so seconds then recovers. Does it each time launcher drive icon is clicked.

ProblemType: Crash
DistroRelease: Ubuntu 15.10
Package: unity 7.3.2+15.10.20150910.1-0ubuntu1
ProcVersionSignature: Ubuntu 4.2.0-10.12-generic 4.2.0
Uname: Linux 4.2.0-10-generic x86_64
NonfreeKernelModules: wl
ApportVersion: 2.18.1-0ubuntu1
Architecture: amd64
CrashCounter: 1
CurrentDesktop: Unity
Date: Sat Sep 19 09:34:11 2015
ExecutablePath: /usr/bin/compiz
InstallationDate: Installed on 2015-09-05 (13 days ago)
InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Alpha amd64 (20150905)
ProcCmdline: compiz
ProcEnviron:
 PATH=(custom, no user)
 SHELL=/bin/bash
 LANG=en_US.UTF-8
 LANGUAGE=en_US
 XDG_RUNTIME_DIR=<set>
SegvAnalysis:
 Segfault happened at: 0x7f5312b05338 <g_bit_lock+72>: lock bts %r12d,(%rbx)
 PC (0x7f5312b05338) ok
 source "%r12d" ok
 destination "(%rbx)" (0x00000020) not located in a known VMA region (needed writable region)!
SegvReason: writing NULL VMA
Signal: 11
SourcePackage: unity
StacktraceTop:
 g_bit_lock () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
 ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
 g_variant_serialiser_needed_size () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
 ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
 ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
Title: compiz crashed with SIGSEGV in g_bit_lock()
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo usb