Bad block returned via KFree.

Occurs on:  86 and 286.  This is an Abend error.

Meaning:  A block of memory was returned by a process to the file lock
          memory segment to be reused.  This error occurs if the address
          of the returned block of memory overlaps with a portion of
          memory that was not allocated.  This is an internal
          consistency check and should never occur.

Cause:  This error could be caused by a memory failure in the file
        server attributable to either a hardware failure or poor power
        line conditioning.  A corrupt operating system file might also
        cause this error.

Solution:  Reboot the file server.  If this error or other Abend errors
           occur repeatedly, reinstall the operating system and then
           check the file server's memory and power line conditioning.