with hardware acceleration disabled no crashes, lockups, etc. within 4-4.5
hours,

now running chromium with

R600_LLVM=0 R600_DEBUG=sb,sbsafemath,nollvm chromium-browser

== LLVM is disabled

and watching HTML5 videos,

did a little search through bugs.freedesktop.org:

radeonsi isn't the only chipset family affected: intel cards hd2000, hd3000,
hd4000; gm45, gm965, i915 (sandybridge, ivybridge, haswell, etc.), or other
radeons are also affected in different ways