- Protect all accesses to nsw_[rw]count{,_{,a}sync} with the pbuf mutex. - Don't drop the vm mutex while grabbing the pbuf mutex to manipulate   said variables.
- Protect all accesses to nsw_[rw]count{,_{,a}sync} with the pbuf mutex.
- Don't drop the vm mutex while grabbing the pbuf mutex to manipulate
  said variables.

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase