Date: Sat, 3 Jun 1995 11:46:28 -0700 (PDT) From: "Rodney W. Grimes" <rgrimes@gndrsh.aac.dev.com> To: noni4737@mstr.hgc.edu (walter noniewicz) Cc: freebsd-bugs@FreeBSD.org Subject: Re: kernel page fault while doing tar to /dev/rft0 Message-ID: <199506031846.LAA15718@gndrsh.aac.dev.com> In-Reply-To: <199506031820.AA08271@mstr.hgc.edu> from "walter noniewicz" at Jun 3, 95 02:20:07 pm
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>
> I added a Conner floppy tape drive to a machine running 2.0R. When a tried
> to "tar cvf /dev/rft0" the machine choked:
man ft:
ft is used primarily as a filter for tape i/o. For example, to save and
compress the /usr directory to tape:
% tar cvzf - /usr | ft "/usr save"
To extract /usr from tape:
% ft | tar xvzf -
>
> Fatal tray 12: page fault while in kernel mode
> fault virtual address = 0x4
> fault code = supervisor read, page not present
> instruction pointer = 0x8:0xf0191906
> code segment = base 0x0, limit 0xffff, type 0x1b
> = DPL 0, pres 1, def32 1, gran 1
> processor eflags = interrupt enabled, resume, IOPL = 0
> current process = 100 (tar)
> interrupt mask =
> panic: page fault
Yes, it is a derefernced null some place in the Driver, some one
is suppose to be working on fixing this but I have not heard from
them in 2 months :-(.
You are not suppose to open /dev/ft directly, allow ft to do that for
you!!!
> syncing disk... 5 5 2 done
>
> It then goes into an automatic reboot. I'll be happy to supply configuration
> details if any one cares. Otherwise, consider this just an FYI item.
> Thanks.
> Walter
>
--
Rod Grimes rgrimes@gndrsh.aac.dev.com
Accurate Automation Company Custom computers for FreeBSD
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