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Date: Fri, 21 Sep 2001 17:10:01 -0700 (PDT)
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From: Boris Staeblow <balu@dva.in-berlin.de>
Subject: kern/30704: 4.4R and I4B: loaded NETGRAPH and ifconfig iprX down -> page fault!
Reply-To: Boris Staeblow <balu@dva.in-berlin.de>
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The following reply was made to PR kern/30704; it has been noted by GNATS.

From: Boris Staeblow <balu@dva.in-berlin.de>
To: freebsd-gnats-submit@FreeBSD.org
Cc:  
Subject: kern/30704: 4.4R and I4B: loaded NETGRAPH and ifconfig iprX down -> page fault!
Date: Fri, 21 Sep 2001 02:37:53 -0700 (PDT)

 >Number:         30704
 >Category:       kern
 >Synopsis:       4.4R and I4B: loaded NETGRAPH and ifconfig iprX down -> page fault!
 >Confidential:   no
 >Severity:       serious
 >Priority:       medium
 >Responsible:    freebsd-bugs
 >State:          open
 >Quarter:        
 >Keywords:       
 >Date-Required:
 >Class:          sw-bug
 >Submitter-Id:   current-users
 >Arrival-Date:   Fri Sep 21 02:40:00 PDT 2001
 >Closed-Date:
 >Last-Modified:
 >Originator:     Boris Staeblow
 >Release:        4.4-RELEASE
 >Organization:
 private
 >Environment:
 FreeBSD 4.4-RELEASE
 
 >Description:
 If NETGRAPH is loaded and you 'ifconfig iprX down' an interface
 the system will crash always with:
 
 
 Fatal Trap 12: page fault while in kernel mode
 fault virtual address   = 0x31727079
 fault code              = supervisor read, page not present
 instruction pointer     = 0x8:0xc017323d
 stack pointer           = 0x10:0xd1a58df4
 frame pointer           = 0x10:0xd1a58e00
 code segment            = base 0x0, limit 0xfffff, type 0x1b
                         = DPL 0, pres 1, def32 1, gran 1
 precessor eflags        = interrupt enabled, resume, IOPL = 0
 current process         = 32457 (ifconfig)
 interrupt mask          = net tty
 trap number             = 12
 panic: page fault
 
 syncing disks...
 done
 
 This is reproduceable. The crash will not occur when netgraph is not
 loaded / defined in kernel (but I need it for pppoed!).
 
 The system will crash too when the iprX-connection establishes
 (to old an current I4B-Versions and Suse-Linux).
 
 The system will always crash if you enter "ifconfig iprX ether x:x:x:x:x:x..."
 (it doesn't matter if netgraph is loaded or not in this case).
 
 These bugs where reproduced on a totally different 4.4R machine.
 These bugs didn't occur on 4.3R _or_ with the previous i4b-Release in -STABLE.
 
 >How-To-Repeat:
 - Install 4.4-Release
 - configure i4b
 - configure a ipr device in i4b
 - load netgraph (netgraph, netgraph-socket, netgraph-ether, netgraph-pppoe)
 - ifconfig iprX down to reproduce the crash
 - ifconfig iprX ether 1:2:3:4:5:6 to reproduce the crash
 >Fix:
 workaround: disable or unload netgraph
 
 >Release-Note:
 >Audit-Trail:
 >Unformatted:
 
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