gnome-control-center segfault on vpn changes

StacktraceTop:
 g_type_check_instance (type_instance=type_instance@entry=0x56251af82340) at ../../../../gobject/gtype.c:4133
 g_signal_emit_valist (instance=0x56251af82340, signal_id=427, detail=0, var_args=var_args@entry=0x7ffead03f3f0) at ../../../../gobject/gsignal.c:3176
 g_signal_emit (instance=instance@entry=0x56251af82340, signal_id=<optimized out>, detail=detail@entry=0) at ../../../../gobject/gsignal.c:3447
 vpn_state_changed_proxy (proxy=<optimized out>, vpn_state=7, reason=3, user_data=0x56251af82340) at libnm/nm-vpn-connection.c:114
 ffi_call_unix64 () at ../src/x86/unix64.S:76

the stacktrace suggest that it has to do with vpn state change, did you connect to the vpn while you were configuring your printing or something similar?

Confirmed, it segfaults when you disconnected from a vpn while it's open, sent upstream to https://bugzilla.gnome.org/show_bug.cgi?id=787893

there is a working patch upstream now

Uploaded, baking in proposed for a bit

This bug was fixed in the package network-manager - 1.8.4-1ubuntu1

---------------
network-manager (1.8.4-1ubuntu1) artful; urgency=medium

  * debian/patches/manager-Disconnect-from-signals-on-the-proxy-when-we.patch,
    debian/patches/vpn-remote-connection-disconnect-signal-handlers-whe.patch:
    Cherry-pick two patches from upstream. Fix leaked signal connections which
    caused handlers to be called on disposed objects, leading to crashes in
    some situations. (LP: #1704618) (LP: #1718006)
  * Merge with Debian. Remaining changes:
    - Use systemd-resolved instead of dnsmasq
    - debian/control:
      + Depend on isc-dhcp-client instead of recommends
      + Recommend network-manager-pptp
      + Suggest avahi-autoipd for IPv4LL support
    - debian/control, debian/rules:
      + Disable team support since it's in universe
    - debian/rules, debian/network-manager.postinst:
      + Don't restart NetworkManager on upgrade but recommend restarting
        the computer
    - debian/rules, debian/network-manager.postinst:
      + Don't install sysvinit scripts or migrate from sysvinit
    - debian/network-manager.postinst:
      + Don't add the netdev group.
      + Handle upgrades from unmanaged policy
      + drop in an empty override file for NetworkManager to manage all devices
        for upgrade from any version, as long as there is no netplan
        configuration yet. (LP: #1676547)
    - debian/network-manager.maintscript
      + Remove /etc/dbus-1/system.d/nm-ofono.conf
    - debian/default-wifi-powersave-on.conf, debian/rules:
      + Install a config file to enable WiFi powersave
    - Enable build tests
    - Add autopkgtests
    - debian/source_network-manager.py, debian/network-manager.install,
      debian/network-manager.links: Add apport hook
    - Update Vcs links to point to Ubuntu branch
    - debian/patches/*: Add patches. See patch descriptions for more details.
    - dpkg-shlibdeps doesn't parse Version Reference, thus add a manual dep
      on libc6 >= 2.25. LP: #1715641.
    - Add n-m-config-connectivity-ubuntu package (LP: #997200)
    - NetworkManager.conf: disable MAC randomization feature. There is no
      easy way for desktop users to disable this feature yet. And there are
      reports that it doesn't work well with some systems. (LP: #1681513)

network-manager (1.8.4-1) unstable; urgency=medium

  * New upstream version 1.8.4
  * Rebase patches
  * Switch to dh_missing and abort on uninstalled files

 -- Iain Lane <email address hidden> Fri, 22 Sep 2017 18:56:30 +0100