The r254167 moved initialization of the sleepqueues before the witness is operational.  init_sleepqueues() initializes 256 mutexes, which, due to witness still being cold, started to overflow the pending_locks array.
The r254167 moved initialization of the sleepqueues before the witness
is operational.  init_sleepqueues() initializes 256 mutexes, which,
due to witness still being cold, started to overflow the pending_locks
array.

As stated in the reported panic message, increase WITNESS_PENDLIST
from 768 to 1024, which provides space for additional 256 locks.

Reported by:	many
Tested by:	rakuco, bdrewery

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