[Pkg-games-ubuntu] [Bug 1208625] Re: freeciv-gtk2 crashes under Unity when using menubar in cities report

[Jacob Nevins]

I wrote:
> Just had a report of this particular menubar disappearing entirely on Ubuntu 13.10

Turns out to be a completely different issue (bug #1242937) -- the way
global menus worked was revamped in 13.10 (with a new component "unity-
gtk-module"), so this 13.04 issue is unlikely to apply there.

Would still like this 13.04 issue resolved if possible...

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Title:
  freeciv-gtk2 crashes under Unity when using menubar in cities report

Status in Freeciv Game:
  New
Status in “freeciv” package in Ubuntu:
  New

Bug description:
  (Filing against freeciv initially, but may turn out to be a bug in
  appmenu-gtk or thereabouts.)

  On Ubuntu 13.04 with Unity, running the supplied Freeciv (2.3.2-1),
  using the menubar on the cities report (F4) -- not the individual city
  dialog -- can cause the freeciv-gtk2 client to crash (segfault).

  Originally noticed when changing production, but simply fiddling with the menubar will cause a crash sooner or later. Steps to reproduce:
  1. Start new game
  2. Found a city (select Settlers, press B)
  3. Open cities report (F4) and select the new city
  4. Repeatedly click on "Production" menu (bottom left), popping and unpopping it. Within about ten open/close cycles, the client crashes for me.

  Friend reports that this did not used to happen with the same workflow
  under Ubuntu 12.10 (which had the same version of Freeciv packaged) --
  it seems to be new with 13.04.

  There is some associated console spew [edited]:

  When the Production menu is opened, we tend to get three repeats of:
  (freeciv-gtk2:2466): LIBDBUSMENU-GTK-CRITICAL **: watch_submenu: assertion `GTK_IS_MENU_SHELL(menu)' failed

  Sometimes we also see the following correlated with menubar activity:
  (freeciv-gtk2:2466): GLib-GObject-CRITICAL **: g_closure_unref: assertion `closure->ref_count > 0' failed
  (freeciv-gtk2:2466): GLib-GObject-WARNING **: g_object_weak_unref: couldn't find weak ref 0x7fdbe02e4e40(0x9fd8058)

  or sometimes
  (freeciv-gtk2:2534): GLib-GObject-CRITICAL **: g_closure_ref: assertion `closure->ref_count > 0' failed

  I expect there are crash reports of this available on
  errors.ubuntu.com, but I don't currently have access to that.
  Backtraces I've seen have almost all frames in Gtk/dbusmenu/etc rather
  than freeciv proper.

  We've had trouble with Unity's menu-bar-stealing arrangements before
  (bug #743265). Tellingly, I cannot reproduce the crash if I launch
  Freeciv with "UBUNTU_MENUPROXY= freeciv-gtk2" (no crash in any of my
  experiments, including 30 cycles).

  As a result of the previous bug, this menu bar is decorated with the
  property "ubuntu-local" to tell appmenu-gtk/dbusmenu/etc to keep their
  hands off it. But the UBUNTU_MENUPROXY environment variable still
  makes a difference, suggesting that it's not *completely* ignoring
  this menubar. On the other hand, perhaps there's some bug in the way
  we set up this menubar that appmenu is tickling -- it doesn't seem to
  happen with any of the other "auxiliary" menubars (such as the Nations
  report).

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