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Date: Tue, 25 Sep 2001 16:49:17 +0200 (CEST)
From: Andreas Haakh <ah@Haakh.de>
To: Boris Staeblow <bs@dva.in-berlin.de>
Cc: <freebsd-isdn@FreeBSD.ORG>
Subject: Re: 4.4R: loaded NETGRAPH and ifconfig iprX down -> page fault!
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Hi,

same problem here. netgraph is loaded by /boot/loader and any ifconfig
iprX down causes a crash.

Even more. The system will not run stable if you don't touch it. It will
crash randomly, several times a day.

Andreas

On Fri, 21 Sep 2001, Boris Staeblow wrote:

> Hello,
>
> There seems to be a serious bug in I4B:
> 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.
>
>
> My enviroment:
>
> - FreeBSD 4.4-RELEASE
> - I4B 01.00.1
>
>
>
> Is this reproduceable on other machines? Are there any fixes?
>
> Boris
>
>
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--
Ingenieurbüro für Baustatik *  Dipl.-Ing. Andreas Haakh
Mollerstraße 7  *  64289 Darmstadt  *  Andreas@Haakh.de
Tel. 06151-788361 Fax. 06151-788362 Mobil 0173-361.6884


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