Subject: port-hp300/503: pmap related panics while doing dump/restore in singleuser
To: None <firstname.lastname@example.org>
From: Jason R. Thorpe <thorpej@mail.CS.ORST.EDU>
Date: 09/30/1994 03:05:08
>Synopsis: pmap related panics while doing dump/restore in singleuser
>Responsible: gnats-admin (GNATS administrator)
>Arrival-Date: Fri Sep 30 03:05:05 1994
>Originator: Jason R. Thorpe
Jason R. Thorpe email@example.com 758-2003
Systems Administrator CSWest Room 12 737-2229
CS Dept, Oregon State University http://www.cs.orst.edu/~thorpej
"I brought my BOWLING BALL -- and some DRUGS!"
>Release: NetBSD 1.0_BETA (sup'd approx 2 weeks ago)
System: NetBSD basalt 1.0_BETA NetBSD 1.0_BETA (BASALT) #4: Fri Sep 30 00:17:49 PDT 1994 thorpej@helix:/usr/src/sys/arch/hp300/compile/BASALT hp300
hp 380, 24meg mem, scsi, hpib, hs-hpib, dca, dcm, catseye, lan, etc.
maxusers at 24 in kernel config.
While bringing up my new 380, it came time to dump what was on the
hpib disks onto the scsi disk. I typically use dump/restore in
a pipeline to do this.
After booting into single user mode, fsck -p'ing, mounting all
physical partitions, I proceded as follows:
# mount /dev/sd0a /mnt
# dump 0sf 222000 - / | (cd /mnt; restore rf -)
The dump gets through Pass I, Pass II, and does the following
at the beginning of Pass III
vm_fault(f1000, 7e6000, 1, 0) -> 1
type 8, code [mmu,,ssw]: 545
trap type 8, code = 545, v = 7e6000
kernel: MMU fault trap
stopped at _free+0x30: movaw (a3),a1
a trace gives the following:
Pretty sure it's not a hardware problem - the machine, just a couple of
days ago, was running HP-UX 9.00, HP VUE, FrameMaker, etc, etc, etc.
Well, I don't have a clue. The thing is great in multiuser.
I really believe that this is related to the `freezing'
problems that I have on a 380 at work, which dies randomly when
maxusers is set at 32 or higher. Ever since I brought maxusers
down to 16, the machine has been great. So guess what I'm going
to try here...I'll admit that 24 was a strange number in this
case, and I'm wondering why I ever picked it...I guess 8 just
sounded too low...