System Appears to Hang When the PC ATA (pcata) Module Is modunloaded (BugID 4096137)
If there is a PCMCIA I/O card in a slot that has been accessed and the card driver is unloaded (as occurs during modunload
-i 0 at the end of multi-user boot) the system appears to hang.
Workaround: Removing the card may bring the system back.