[Bug 1704618] [NEW] gnome-control-center crashed with SIGSEGV in manager_recheck_permissions()

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Test Case:
1. Open the 'Users' panel in gnome-control-center
2. Select a user then click on 'Unlock' (top right button in the title bar)

Expected result
The panel is unlocked

Actual Result
This crash.


ProblemType: Crash
DistroRelease: Ubuntu 17.10
Package: gnome-control-center 1:3.24.2-0ubuntu5
ProcVersionSignature: Ubuntu 4.11.0-10.15-generic 4.11.8
Uname: Linux 4.11.0-10-generic x86_64
ApportVersion: 2.20.5-0ubuntu5
Architecture: amd64
CurrentDesktop: GNOME
Date: Sun Jul 16 10:09:12 2017
ExecutablePath: /usr/bin/gnome-control-center
InstallationDate: Installed on 2017-06-26 (20 days ago)
InstallationMedia: Ubuntu 16.04.2 LTS "Xenial Xerus" - Release amd64 (20170215.2)
ProcCmdline: gnome-control-center --overview
SegvAnalysis:
 Segfault happened at: 0x7ff4ea6fe6e9:	cmpq   $0x0,0x58(%rax)
 PC (0x7ff4ea6fe6e9) ok
 source "$0x0" ok
 destination "0x58(%rax)" (0x00000058) not located in a known VMA region (needed writable region)!
SegvReason: writing NULL VMA
Signal: 11
SourcePackage: gnome-control-center
StacktraceTop:
 ?? () from /usr/lib/x86_64-linux-gnu/libnm.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: gnome-control-center crashed with SIGSEGV in ffi_call_unix64()
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo

** Affects: network-manager
     Importance: Medium
         Status: Fix Released

** Affects: gnome-control-center (Ubuntu)
     Importance: High
         Status: Fix Committed


** Tags: amd64 apport-crash artful bugpattern-needed rls-aa-incoming third-party-packages
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gnome-control-center crashed with SIGSEGV in manager_recheck_permissions()
https://bugs.launchpad.net/bugs/1704618
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