Docky on LXDE/OpenBox crashes when mouse hovers over dock

Question

Hi all!
On an (almost) fresh install of LXDE on Arch Docky crashes whenever the mouse hovers over it.
- up-to-date Arch/LXDE (executed pacman -Syu today)
- xcommgr is running (but it also happens w/o it)
- Docky starts up, shows default icons etc., everything seems fine
- when mouse hovers over area occupied by Docky it crashes instantaneously:
error 3: BadWindow (invalid Window parameter) request 15 minor 0 serial 2079
mono: cairo-scaled-font.c:459: _cairo_scaled_glyph_page_destroy: Assertion `!scaled_font->cache_frozen' failed.
Stacktrace:
at <unknown> <0xffffffff>
at (wrapper managed-to-native) Pango.CairoHelper.pango_cairo_layout_path (intptr,intptr) <0xffffffff>
at Pango.CairoHelper.LayoutPath (Cairo.Context,Pango.Layout) <0x00053>
at Docky.Items.AbstractDockItem.HoverTextSurface (Docky.CairoHelper.DockySurface,Gtk.Style,bool) <0x003bf>
at Docky.Interface.DockWindow.UpdateHoverText () <0x003bf>
at Docky.Interface.DockWindow.set_HoveredItem (Docky.Items.AbstractDockItem) <0x00087>
at Docky.Interface.DockWindow.OnExposeEvent (Gdk.EventExpose) <0x00513>
at Gtk.Widget.exposeevent_cb (intptr,intptr) <0x0006e>
at (wrapper native-to-managed) Gtk.Widget.exposeevent_cb (intptr,intptr) <0xffffffff>
at <unknown> <0xffffffff>
at (wrapper managed-to-native) Gtk.Application.gtk_main () <0xffffffff>
at Gtk.Application.Run () <0x0000b>
at Docky.Docky.Main (string[]) <0x005cb>
at (wrapper runtime-invoke) <Module>.runtime_invoke_void_object (object,intptr,intptr,intptr) <0xffffffff>
Native stacktrace:
mono() [0x4b5bc1]
/usr/lib/libpthread.so.0(+0xf870) [0x7f4a6fae3870]
/usr/lib/libc.so.6(gsignal+0x39) [0x7f4a6f75f369]
/usr/lib/libc.so.6(abort+0x148) [0x7f4a6f760768]
/usr/lib/libc.so.6(+0x2e456) [0x7f4a6f758456]
/usr/lib/libc.so.6(+0x2e502) [0x7f4a6f758502]
/usr/lib/libcairo.so.2(+0x66d93) [0x7f4a66fc3d93]
/usr/lib/libcairo.so.2(+0x140d9) [0x7f4a66f710d9]
/usr/lib/libcairo.so.2(+0x68db0) [0x7f4a66fc5db0]
/usr/lib/libcairo.so.2(+0x6a06f) [0x7f4a66fc706f]
/usr/lib/libcairo.so.2(+0x331ca) [0x7f4a66f901ca]
/usr/lib/libcairo.so.2(cairo_glyph_path+0x22) [0x7f4a66f827a2]
/usr/lib/libpangocairo-1.0.so.0(+0x7e21) [0x7f4a6d374e21]
/usr/lib/libpangocairo-1.0.so.0(+0x81b4) [0x7f4a6d3751b4]
/usr/lib/libpango-1.0.so.0(pango_renderer_draw_glyphs+0x3f) [0x7f4a6d14979f]
/usr/lib/libpango-1.0.so.0(pango_renderer_draw_layout_line+0x4a8) [0x7f4a6d14a128]
/usr/lib/libpango-1.0.so.0(pango_renderer_draw_layout+0x115) [0x7f4a6d14a485]
/usr/lib/libpangocairo-1.0.so.0(+0x835a) [0x7f4a6d37535a]
[0x416f74b1]
Debug info from gdb:
=================================================================
Got a SIGABRT while executing native code. This usually indicates
a fatal error in the mono runtime or one of the native libraries
used by your application.
=================================================================
Did anybody else run into this? Any ideas how to fix it?
(just in case it matters: Arch is running on VBox 4.3.6. So far, I didn't run into any other crashes or problems with DE or WM)
Thanks & Cheers
  Ax

Answer 1

Greetings!
If you are still on this issue, I suggest you check out your fonts.  Had you been fooling with them?
I once rebuilt my entire OS due to this problem a couple of years ago.  It popped up again yesterday and I determined to find the issue.
It was my fonts.  I use Funtoo (I used to use ArchLinuxArm so I'm registered here) and just prior to the problem I was fooling with the infinality/lcdfilter settings.  After chasing my tail all day today I went and changed some font settings and that was it!  For me the same issue occurred whenever I tried to add the weather icon, the best thing about Docky.
I had been fooling with the fonts 2 years ago too...
An ominous and unhelpful error message to be sure.
Good luck.
Last edited by yuyu (2014-04-03 03:31:33)