in tools/locktrace.lua [39:49]
get_kwq_type = function(val)
if val & 0xff == 0x1 then
return "MTX"
elseif val & 0xff == 0x2 then
return "CVAR"
elseif val & 0xff == 0x4 then
return "RWL"
else
return string.format("0x%04x", val)
end
end