Patch ID	: P94041915
Summary		: Fix for data fault panic in sched
Status		: Mandatory
Date		: 04/19/94
Release		: OS 4.1C
Architectures	: Series5 S4000 Series6
Affected bugs	:
	B940408001

Changed files	:
	sys/os/vm_sched.c (delta 1.5)

Problem Description:
This patch fixes a problem which can result in a data fault panic in sched.

A typical traceback follows:

BAD TRAP on cpu 2 in slot 5, ipl = 142
MXCC error reg hi = 0x00000000, lo = 0x00000000
cpu 2 in slot 5 pid 0, `': Data fault
kernel read fault at addr=0x38, pte=0x0
Fault Status Reg: 126<Fault_address_valid> Invalid_address Supervisor_data_load Level1
pid=0 rp=0xffffed74 pc= _sched+894(ff11201c) sp=0xffffee28 psr=0x414000c6 ipl=0xff ctxnum=0x813
g1-g7: ff1ee82c, 2, 1000000, 0, b0114c00, 0, 114cd40
Begin traceback { sp = ffffee28
Called from _main+500(ff0d0170), fp=ffffee90
args=ff2a7b78 ff7dffe4 ff2a7b6c 27 0 ff7e0098
Called from tbr_ok+220(ff0a135c), fp=ffffeef0
args=ff28ec18 6 2 3 0 3d8
Called from TOO LOW+fe009960(fe009960), fp=0
args=11 ff04a95c 0 7efefeff 81010100 ff0000
End traceback }
