Overall functionality on QNX is broken based on both code review and some additional tests. For eg.

a) Lack of thread safety for bufs array (all accesses shall be under mutex)
b) Lack of strategy to coherently release mapping for imported handles
c) non working import reference to image where reference has been previously imported
**

Thus, although we temporary use patch checking bufs[i].phy_addr == 0 while searching buffers, they are looking for a coherent thread safe and release/reimport friendly delivery{}