I'm experiencing the same thing. OpenBSD5.8-STABLE on vmware. The message is repeatedly spammed to the console.
- Computer hangup : scsi_xfer pool exhausted! Sébastien Morand
- Re: Computer hangup : scsi_xfer pool exhausted! Laurence Tratt
- Re: Computer hangup : scsi_xfer pool exhausted! Joris Vanhecke