ASE 11.9.2.1 SWR 8741 ESD 4, NT 4.0 SP3, 1GB RAM, 4 500MHZ PROCESSORS.
I got this messages in the errorlog, the upstatus repeats frequently:

03:00000:00000:2000/01/10 10:09:33.40 kernel kpsched: kpid 171573537 bad
status 0x10484
02:00000:00245:2000/01/10 10:09:33.40 server Process id 255 killed by
Hostname WinNT, Host process id -672635.
02:00000:00245:2000/01/10 10:09:35.31 kernel upstatus: kpid = 171573537,
status 0x10484 not valid
02:00000:00245:2000/01/10 10:09:38.26 server Process id 24 killed by
Hostname WinNT, Host process id -672635.
02:00000:00245:2000/01/10 10:09:39.84 kernel upstatus: kpid = 171573537,
status 0x10484 not valid
02:00000:00245:2000/01/10 10:09:42.64 kernel upstatus: kpid = 171573537,
status 0x10484 not valid

This day i had to reboot the server because it became so slow.