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Date:      Mon, 3 Apr 2000 18:54:37 -0400
From:      "C J Michaels" <cjm2@earthling.net>
To:        <freebsd-stable@FreeBSD.ORG>
Subject:   RE: Fatal trap 12: page fault while in kernel mode
Message-ID:  <NDBBILKDCLLECBCLPMBIAEBOCAAA.cjm2@earthling.net>
In-Reply-To: <Pine.BSF.4.21.0004011548230.391-300000@tv.weeble.dyndns.org>

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Again, not one to reply to my own postings, but the 4/2 commits for umass.c
and the like corrected this problem.  I don't know if it was coincidental or
a direct result of my posting, but either way, thank you.

--
Chris

-----Original Message-----
From: owner-freebsd-stable@FreeBSD.ORG
[mailto:owner-freebsd-stable@FreeBSD.ORG]On Behalf Of Christopher J.
Michaels
Sent: Saturday, April 01, 2000 4:05 PM
To: freebsd-stable@FreeBSD.ORG
Subject: Fatal trap 12: page fault while in kernel mode


Running 4.0-STABLE cvsupped at 12:00am EST.
Gigabyte GA-7XI w/ Athlon 600 proc.

I get the following panic on bootup when the umass driver is compiled into
the kernel.  It panic's at the point where the root file system would
usually be mounted.  (This is hand typed since it's not getting far enough
to generate a dump):

Fatal trap 12: page fault while in kernel mode
fault virtual address	= 0x70
fault code		= supervisor read, page not present
instruction pointer	= 0x8:0xc0145350
stack pointer		= 0x10:0xc025f680
frame pointer		= 0x10:0xc025f6a8
code segment		= base 0x0, limit 0xfffff, type 0x1b
			= DPL 0, pres 1, def32 1, gran 1
processor eflags	= interrupt enabled, resume, IOPL = 0
current process		= Idle
interrupt mask		= net tty bio cam
kernel: type 12 trap, code=0
Stopped at	tsleep+0x54:	cmpl	$0,0x70(%ebx)


I did compile with -G and also options DDB, but I haven't the slightest
idea what to do at th db> prompt that would be useful.

I'd like to submit a PR on this but this doesn't feel like enough info,
does anyone have any pointers or is this enough information.

I am attaching the DMESG and kernel config of successful boot of the same
kernel with umass commented out.

Thanks for any help
--
Chris



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