problems backing up to tape

Daniel Gruner (dgruner@tikva.chem.utoronto.ca)
Mon, 30 Dec 1996 17:06:31 -0500 (EST)

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I have a Microway Screamer (pc164, 433MHz) with Stealth 64 Video card,
and Adaptec AHA2964UW scsi controller, 4GB fast/wide disk, Plextor 8x
cdrom, and Exabyte 8205XL 8mm tape drive.

When I try to back up my disk to tape (using tar), the process eventually
dies a horrible death:

Unable to handle kernel paging request at virtual address 00000000068899c
swapper(0): Oops 0
pc = ...
.
.
.
r24=....

Aiee, killing interrupt handler
kfree of non-kmalloced memory:
fffffc0000471b08, next=0, order=0
fffffc0000471af0, next=0, order=0
fffffc0000472410, next=0, order=0

idle task may not sleep
.
.
.

And so on. It is reproducible too (I don't know if the exact registers
and their contents, but certainly the phenomenon). Dumping a
couple of meg to tape is no problem, but once it gets on a roll it
just doesn't last long. I am running kernel 2.0.23, as supplied by
Microway, on a 3.0.3 redhat system.

Any comments/help?
Thanks,
Daniel

Dr. Daniel Gruner dgruner@tikva.chem.utoronto.ca Dept. of Chemistry phone: (416)-978-8689 University of Toronto fax: (416)-978-5325

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