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

[wforms at Safe-mail.net]

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

From: wforms at Safe-mail.net
To: bug-followup at freebsd.org
Cc: marius at alchemy.franken.de, "Andy Farkas" <chuzzwassa at gmail.com>
Subject: Re: kern/112654: [pcn] Kernel panic upon if_pcn module load on a Netfinity 5000
Date: Tue, 22 Jan 2008 19:23:17 +0100

 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
 
 Regards,
 Keve