https://bugs.freedesktop.org/show_bug.cgi?id=64867
--- Comment #2 from Harald Judt h.judt@gmx.at --- 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 [...]
then: radeon 0000:01:00.0: GPU fault detected: 146 0x07151004 radeon 0000:01:00.0: VM_CONTEXT1_PROTECTION_FAULT_ADDR 0x00000000 radeon 0000:01:00.0: VM_CONTEXT1_PROTECTION_FAULT_STATUS 0x00000000 [...] repeated a hundred times with only the first line changing a bit [...]
Times indicate this goes on for approximately two minutes before the hang.