[Bug 64867] Hangs on Cayman (HD6950) when watching flash/using vdpau

https://bugs.freedesktop.org/show_bug.cgi?id=64867

--- Comment #3 from Alex Deucher agd5f@yahoo.com --- (In reply to comment #2)

I too get system hangs when watching a flash video in firefox. linux-3.8.13, libdrm, mesa etc. git. Screen simply becomes black (no signal) and machine is dead, leaving a hard reset as the only option. The dmesg is flooded with the following lines:

radeon 0000:01:00.0: GPU fault detected: 147 0x0d859002 radeon 0000:01:00.0: VM_CONTEXT1_PROTECTION_FAULT_ADDR 0x000012D8 radeon 0000:01:00.0: VM_CONTEXT1_PROTECTION_FAULT_STATUS 0x05090002 [...] repeated a hundred times with only the first line changing a bit [...]

Something in the mesa drivers is emitting a command buffer without a proper virtual address for CB5.