Created attachment 98951 [details]
Radeon deadlock with Flash + VDPAU

1) Enable VDPAU support in flash player [1]
2) Visit web pages such as [2] (in that page the hang happens
   when the AD has been played and the actual video should start).

At this point the flash player hangs (plugin-container process with firefox),
and there's no way to resume it other than killing the parent process.

It seems like a deadlock, see the attached backtrace; not sure if this has
something in common with Bug 70123.
This is when using mesa 10.1 (4a86465) in Ubuntu 14.04.

[1] echo -e "EnableLinuxHWVideoDecode = 1\nOverrideGPUValidation = 1" >>
/etc/adobe/mms.cfg
[2]
http://video.corriere.it/i-ragazzi-anni-90-come-eravamo/9fd1a13c-d9b5-11e3-8b8a-dcb35a431922