451078 - crash when dragging in libgdk-x11 on cairo_draw_with_gdk

Status: RESOLVED DUPLICATE of bug 449959

(Core Graveyard :: GFX: Gtk, defect)

Description

[Myk Melez [:myk] [@mykmelez]]

I'm seeing crashes when dragging parts of the UI in libgdk-x11 when it is called by cairo_draw_with_gdk.  Here's a sample crash report:

http://crash-stats.mozilla.com/report/index/e9967bee-6d4e-11dd-bca5-001a4bd43ed6?p=1

So far I've seen this with two kinds of drag attempts:

1. dragging a tab to a new location on the tab bar;
2. dragging a widget from the browser toolbar palette to a toolbar.

The crashes are consistent (I can reproduce 100% of the time), and I've witnessed the behavior in three separate profiles, including a fresh one.  When the crash happens, the following appears in the terminal from which I started Firefox:

(firefox-bin:29304): Gdk-WARNING **: /build/buildd/gtk+2.0-2.12.9/gdk/x11/gdkdrawable-x11.c:822 drawable is not a pixmap or window

I'm testing on the latest nightly:

Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.1a2pre) Gecko/20080818095254 Minefield/3.1a2pre

I also saw this behavior with yesterday's nightly.  I can't reproduce on Windows or Mac.

Note bug 348996 on a crash in the same library, although this seems different.

Comment 1

[Myk Melez [:myk] [@mykmelez]]

bz: might your recent checkin to support tab drag-and-drop between windows have caused this crash?

Comment 2

[Boris Zbarsky [:bzbarsky]]

Unlikely.  I didn't touch any drag code, just the action Firefox chrome took when the drag target was a tab and the drop target was a tabbar in a different window.  All other codepaths remained as they were.