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** Branch linked: lp:ubuntu/vivid-proposed/overlay-scrollbar

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https://bugs.launchpad.net/bugs/1386255

Title:
  devhelp and many other apps crash with SIGSEGV in g_closure_invoke()
  due to overlay-scrollbars

Status in Overlay Scrollbar:
  New
Status in Ubuntu GNOME:
  New
Status in “overlay-scrollbar” package in Ubuntu:
  In Progress

Bug description:
  With the gnome3-team/gnome3-staging PPA enabled all Gtk+ applications
  segfault when I do stuff like

  - Press the <Menu> key
  - Press the Save button in gedit's headerbar
  - Press the hamburger menu button in devhelp's headerbar (the stack trace attached to this bug)
  - Press the Add button in gtimelog
  - Try to open any of the regular menus in gtimelog

  ProblemType: Crash
  DistroRelease: Ubuntu 14.10
  Package: devhelp 3.14.0-1~utopic1 [origin: LP-PPA-gnome3-team-gnome3-staging]
  ProcVersionSignature: Ubuntu 3.16.0-23.31-generic 3.16.4
  Uname: Linux 3.16.0-23-generic x86_64
  ApportVersion: 2.14.7-0ubuntu8
  Architecture: amd64
  CurrentDesktop: GNOME
  Date: Mon Oct 27 17:15:30 2014
  Disassembly: => 0x0:	Cannot access memory at address 0x0
  EcryptfsInUse: Yes
  ExecutablePath: /usr/bin/devhelp
  InstallationDate: Installed on 2012-07-25 (824 days ago)
  InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64 (20120425)
  ProcCmdline: devhelp
  SegvAnalysis:
   Segfault happened at: 0x0:	Cannot access memory at address 0x0
   PC (0x00000000) not located in a known VMA region (needed executable region)!
  SegvReason: executing NULL VMA
  Signal: 11
  SourcePackage: devhelp
  StacktraceTop:
   ?? ()
   g_closure_invoke (closure=0x11e4ce0, return_value=0x0, n_param_values=2, param_values=0x7fffd6ed0920, invocation_hint=0x7fffd6ed08c0) at /build/buildd/glib2.0-2.42.0/./gobject/gclosure.c:768
   signal_emit_unlocked_R (node=node@entry=0x11e50b0, detail=detail@entry=0, instance=instance@entry=0x182a510, emission_return=emission_return@entry=0x0, instance_and_params=instance_and_params@entry=0x7fffd6ed0920) at /build/buildd/glib2.0-2.42.0/./gobject/gsignal.c:3483
   g_signal_emit_valist (instance=<optimized out>, signal_id=<optimized out>, detail=<optimized out>, var_args=var_args@entry=0x7fffd6ed0ab0) at /build/buildd/glib2.0-2.42.0/./gobject/gsignal.c:3309
   g_signal_emit (instance=instance@entry=0x182a510, signal_id=<optimized out>, detail=detail@entry=0) at /build/buildd/glib2.0-2.42.0/./gobject/gsignal.c:3365
  Title: devhelp crashed with SIGSEGV in g_closure_invoke()
  UpgradeStatus: Upgraded to utopic on 2014-10-24 (3 days ago)
  UserGroups: adm cdrom dip docker libvirtd lp lpadmin plugdev sambashare shared sudo wireshark

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