Date: Fri, 21 Sep 2001 02:37:53 -0700 (PDT) From: Boris Staeblow <balu@dva.in-berlin.de> To: freebsd-gnats-submit@FreeBSD.org Subject: kern/30704: 4.4R and I4B: loaded NETGRAPH and ifconfig iprX down -> page fault! Message-ID: <200109210937.f8L9brf78981@freefall.freebsd.org>
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>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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