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Date: Tue, 4 Mar 1997 22:48:55 +0100 (MET)
From: Joachim.Jaeckel@it-mannesmann.de
Reply-To: Joachim.Jaeckel@it-mannesmann.de
To: FreeBSD-gnats-submit@freebsd.org
Subject: Fatal Trap 12: page fault while in kernel mode
X-Send-Pr-Version: 3.2

>Number:         2877
>Category:       kern
>Synopsis:       Fatal Trap 12: page fault while in kernel mode
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    freebsd-bugs
>State:          closed
>Quarter:        
>Keywords:       
>Date-Required:  
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Tue Mar  4 13:50:01 PST 1997
>Closed-Date:    Sat Apr 11 08:43:16 PDT 1998
>Last-Modified:  Sat Apr 11 08:43:30 PDT 1998
>Originator:     Joachim Jaeckel
>Release:        FreeBSD 2.1.6 i386
>Organization:
Lucke EDV GmbH
>Environment:

	Dell OptiPlex 466/Le (486 DX/2 66 Mhz)
	PS/2 Mouse
	Cirrus CL-GD5429 VGA on Board Video-Controller
	16 MB Main-Memory
	1 SCSI HD 1 GB with ID 0 (the first 600 MB for Windo... and the second
				  partition of 192 MB for FreeBSD [64 MB /, 
				  64 MB SWAP and 64 MB /var])
	1 SCSI CD-ROM with ID 1
	1 SCSI HD 2 GB with ID 6 (nearly 900 MB for FreeBSD /usr)

	1 IDE CD-ROM jumpered as MASTER but not used in my kernel!!!
	(By the way: I compiled the probing for a NE2000 Ethernet-Card
	into the kernel, but at the moment, there is no one in my computer.)

>Description:

	In the case i make some swap-intensive compiles, after a while 
	the following error-message appears:

	Fatal trap 12: page fault while in kernel mode
	fault virtual address = 0x218
	fault code            = supervisor read, page not present
	instruction pointer   = 0x8 : 0xf010f175
	code segment          = base 0x0, limit 0xfffff, type 0x1b
	                      = DPL 0, pres1, def32 1, gran1
	processor eflags      = interrupt enabled, resume, IOPL=0
	current process       = 4(update)
	interrupt mask        = net tty bio
	panic: page fault

	I don't think that this is a hardware problem, because my System
	runs under OS/2 and Linux without any problems. (At the moment :-))

	My last thought was, that it could be a problem with a too little
	Swap-Space, but the *swapinfo* program shows only a usage 
	maximum of 57%.

>How-To-Repeat:

	That's no problem for me to reproduce this error, every time I
	make some swap-intensive compiles, this error comes up. (To 
	reproduce I try to compile *ddd* and *plan* at one time)

>Fix:
	
	

>Release-Note:
>Audit-Trail:
State-Changed-From-To: open->closed 
State-Changed-By: phk 
State-Changed-When: Sat Apr 11 08:43:16 PDT 1998 
State-Changed-Why:  
dead PR 
>Unformatted:
