In programming guide page # 95
section 5.1.2.4
last para
it says–
any texture fetch to an address that has been written to via global write in the same kernel call returns undefined data. further more it say a thread cannot read safely via texture some memory if it has been updated by same kernel launch or same thread.
This is only relevant when fetching from linear memory as a kernel
Textures have a cache. Therefore if you write to a location in a texture’s array then later you have the possibility of reading the old value from the cache rather than the new value.