Created attachment 128408 [details]
Saved gdb output from weston

With Weston > 1.9, including 1.12 that just made it into Debian Sid, I have reproducible crash. With recent Firefox/Iceweasel and SeaMonkey versions attempting to drag an image, or some other objects (e.g. drag to reorder tabs), it causes Weston to crash. 

I believe it also did in Chrome with Weston 1.10 or 1.11, but not 1.12. I think that may be to do with recent Chrome and Weston 1.12 running under native Wayland rather than xwayland (however the xwayland version never affects if it crashes).

With Weston 1.9 everything is fine.

I am using Intel Ivy Bridge-class GPU (Intel HD 4000).

Over the time it took to go from Debian Sid having 1.10 to 1.11 to now 1.12, other components (mesa etc) have of course seen version changes, but nothing affect this issue, except rolling back to Weston 1.9

I have attempted a gdb backtrace which I will attach, but I just followed some random guide, I don't understand GDB well at all, if you need me to get another one with different settings or something I can.

Current versions (up to date Sid):
Weston 1.12.0-1
Xwayland 1.19.0-2
Mesa 13.0.2-1
Libdrm2 2.4.74-1