[Bug 736740] New: glimagesink: racy redraw with raw data upload accesses deleted texture
GStreamer (bugzilla.gnome.org)
bugzilla at gnome.org
Tue Sep 16 04:58:35 PDT 2014
https://bugzilla.gnome.org/show_bug.cgi?id=736740
GStreamer | gst-plugins-bad | git
Summary: glimagesink: racy redraw with raw data upload accesses
deleted texture
Classification: Platform
Product: GStreamer
Version: git
OS/Version: Linux
Status: NEW
Severity: normal
Priority: Normal
Component: gst-plugins-bad
AssignedTo: gstreamer-bugs at lists.freedesktop.org
ReportedBy: ystreet00 at gmail.com
QAContact: gstreamer-bugs at lists.freedesktop.org
GNOME version: ---
Possible sequence of events:
1. glimagesink uploads in _prepare() to texture n
1.1 glupload holds buffer n
2. glimagesink _render()s texture n
3. glimagesink uploads texture n+1
3.1 glupload free previous buffer which deletes texture n
3.2 glupload holds buffer n+1
4. glwindow resize
5. glimagesink redraws with texture n
The race is that the buffer n (the one used for redrawing) is freed as soon as
the buffer n+1 arrives. There could be any amount of time and number of
redraws between this event and when buffer n+1 is actually rendered and thus
replaces buffer n as the redraw source.
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