Crash was FIXED by one of this:

36f1999a87258603b6720d55e6020d5d24c215c9
a830225adbb77073272961df409885cca6b861ee
a830225adbb77073272961df409885cca6b861ee

Now GPU hang on 'gsraytrace'.
See attached GALLIUM_DDEBUG dump log (gsraytrace_22964_00000000).

After reboot I found this in kernel log (dmesg):
[    3.521069] [drm:btc_dpm_set_power_state [radeon]] *ERROR*
rv770_restrict_performance_levels_before_switch failed

R600_DEBUG=nosb
image corruption still there
see (new)
fsraytrace.png
gsraytrace.png
vsraytrace.png