%SYSTEM-F-MCHECK, detected hardware error, PC=00003CBB, PSL=0BC00004

Hi,

What can we do about this error message?
%SYSTEM-F-MCHECK, detected hardware error, PC=00003CBB, PSL=0BC00004

The machine is a VAXStation 4000-60 running VMS V5.5-2
with two external 4 GB disks (system and user).
A few days ago, the error message (in entirety below) began appearing on login.

Username:
Password:
Welcome to VAX/VMS V5.5

Last interactive login on Monday, 12-FEB-2007 17:55
Last non-interactive login on Tuesday, 13-FEB-2007 15:50
%SYSTEM-F-MCHECK, detected hardware error, PC=00003CBB, PSL=0BC00004

Improperly handled condition, image exit forced.

Signal arguments Stack contents

Number = 00000003 00000000
Name = 000002BC 21FC0000
00003CBB 00026D6C
0BC00004 00026D54
0000358A
7FFE2810
000078F0
0000031C
7FFE5EC8
00000000

Register dump

R0 = 088F526E R1 = 7FE5CFFF R2 = 0000FFFF R3 = 00038A8F
R4 = 00000000 R5 = 00000000 R6 = 0003241D R7 = 0000FFFF
R8 = 0000FFFF R9 = 7FFECC54 R10= 7FFED7D4 R11= 7FFE2BDC
AP = 00026CDC FP = 00026C9C SP = 00026D10 PC = 00003CBB
PSL= 0BC00004



1) Somehow this clobbers most of the symbols and adds a few:
$ sh symb *

$RESTART == "FALSE"
$SEVERITY == "4"
$STATUS == "%X100002BC"
MOU*NT == "MOUNT/NOASSIST"

$ @local:commondef
[Rerunning this com file restores the symbol definitions.]


2) Each occurence seems to generate CPU and memory errors.

sh error
Device Error Count
CPU 32
MEMORY 32
XRAY$RTA1: 1

3) Running login.com later causes no problems.

4) FTP out works; FTP in fails
<%SYSTEM-F-MCHECK, detected hardware error, PC=!XL, PSL=!XL

5) SDA shows nothing.
SDA> show machine_check/full
SDA>

6) The first time through, ANALYZE/DISK/REPAIR found a bad highwater file mark
with sys.dmp or somesuch, but this error seems to have been fixed.

7) No entries in any log files in sys$manager indicate a problem.

8) The computer has not been rebooted for fear of worse problems.

9) Is this a disk problem,a VAXStation problem, or ?


Any ideas? thanks
larry
.

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