kern/112654: [pcn] Kernel panic upon if_pcn module load on a Netfinity 5000

[Marius Strobl]

The following reply was made to PR kern/112654; it has been noted by GNATS.

From: Marius Strobl <marius at alchemy.franken.de>
To: bug-followup at freebsd.org
Cc: Andy Farkas <chuzzwassa at gmail.com>, wforms at Safe-mail.net
Subject: Re: kern/112654: [pcn] Kernel panic upon if_pcn module load on a Netfinity 5000
Date: Tue, 22 Jan 2008 20:43:48 +0100

 On Tue, Jan 22, 2008 at 07:23:17PM +0100, wforms at Safe-mail.net wrote:
 > New test was carried out today using Marius' patch (and not using Andy's patch at the same time).
 > The new kernel re-introduces the original problem, loading the if_pcn driver while the RJ45 cable is connected results in a kernel panic and the system reboots. While the cable is disconnected the if_pcn module loads fine, after which the cable can be plugged back and the card can be used as expected.
 > 
 > ### Here is what shows up upon "kldload if_pcn" while the cable is unplugged ###
 > pcn0: <AMD PCnet/PCI 10/100BaseTX> port 0x2180-0x219f mem 0xfebff800-0xfebff81f
 > irq 17 at device 9.0 on pci0
 > pcn0: Chip ID 2624 (Am79C972)
 > miibus5: <MII bus> on pcn0
 > nsphyter0: <DP83843 10/100 media interface> on miibus5
 > nsphyter0:  10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, auto
 > ukphy0: <Generic IEEE 802.3u media interface> on miibus5
 > ukphy0:  10baseT, 10baseT-FDX, auto
 > pcn0: Ethernet address: 00:06:29:50:d9:9e
 > 
 > ### At that point ifconfig says: ###
 > root at netfinity ~# ifconfig pcn0
 > pcn0: flags=8802<BROADCAST,SIMPLEX,MULTICAST> mtu 1500
 >         ether 00:06:29:50:d9:9e
 >         media: Ethernet autoselect (none)
 >         status: no carrier
 > ### Then I connect the RJ45 cable coming from the switch and: ###
 > root at netfinity ~# ifconfig pcn0
 > pcn0: flags=8802<BROADCAST,SIMPLEX,MULTICAST> mtu 1500
 >         ether 00:06:29:50:d9:9e
 >         media: Ethernet autoselect (100baseTX <full-duplex>)
 >         status: active
 > root at netfinity ~#
 > 
 > 
 > ### Now here is what "kldload if_pcn" does while the cable is connected: ###
 > pcn0: <AMD PCnet/PCI 10/100BaseTX> port 0x2180-0x219f mem 0xfebff800-0xfebff81f
 > irq 17 at device 9.0 on pci0
 > pcn0: Chip ID 2624 (Am79C972)
 > miibus5: <MII bus> on pcn0
 > nsphyter0: <DP83843 10/100 media interface> on miibus5
 > nsphyter0: no media present
 > ifmedia_set: no match for 0x0/0xfffffff
 > panic: ifmedia_set
 > 
 
 Could you please:
 1) try again with the nsphyter patch already in place and
    http://people.freebsd.org/~marius/nsphyter.c
    copied on top of the existing src/sys/dev/mii/nsphyter.c?
    The new one uses the reset function from nsphy(4), which is about
    the only thing I can think of making the difference that a nsphy(4)
    hacked to attach to the DP83843 doesn't panic.
 2) In case it also panics with the nsphyter.c provide a backtrace.
 
 Thanks,
 Marius