i386/113406: Page fault in XL0 device driver

[Richard Smith]

>Number:         113406
>Category:       i386
>Synopsis:       Page fault in XL0 device driver
>Confidential:   no
>Severity:       critical
>Priority:       low
>Responsible:    freebsd-i386
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Wed Jun 06 11:20:02 GMT 2007
>Closed-Date:
>Last-Modified:
>Originator:     Richard Smith
>Release:        6.2-RELEASE-p5
>Organization:
Satamatics Ltd
>Environment:
FreeBSD controller.satamatics.net 6.2-RELEASE-p5 FreeBSD 6.2-RELEASE-p5 #0: Fri Jun  1 23:39:24 UTC 2007     rdls@:/usr/obj/usr/src/sys/GENERIC  i386
>Description:
Installed device causing problem:
xl0: <3Com 3c900B-COMBO Etherlink XL> port 0xb800-0xb87f mem 0xefdfff80-0xefdfffff irq 10 at device 6.0 on pci2
xl0: selecting 10baseT transceiver, half duplex
xl0: Ethernet address: 00:50:da:43:bc:b4

Command causing problem:
ifconfig xl0 media 10base2/BNC

Full details of panic copied from the screen:
Fatal trap 12: page fault while in kernel mode
fault virtual address = 0x24
fault code = supervisor read, page not present
instruction pointer = 0x20:0xc0692dde
stack pointer = 0x28:0xd0a04c54
frame pointer = 0x28:0xd0a04c68
code segment = base 0x0, limit 0xfffff, type 0x1b
 = DPL 0, pres 1, def32 1, gran 1
processor eflags = resume, IOPL = 0
current process = 23 (irq10: rl0 xl0+)
trap number = 12
panic: page fault

Problem also appears in:
FreeBSD 6.2-RELEASE

Problem does NOT appear in:
FreeBSD 5.4-RELEASE
>How-To-Repeat:
Install a COMBO NIC (one supporting 10base2/BNC and 10baseT/UTP) for the XL0 device driver and issue the following command:

ifconfig xl0 inet 10.1.1.1 netmask 255.255.255.0
ifconfig xl0 media 10base2/BNC

immediate panic

>Fix:
The only fix we currently have is to use an alternative OS version (e.g. 5.4-R) or an alternative combo card (e.g. we have combo cards using the ed0 device that do not present a problem).


>Release-Note:
>Audit-Trail:
>Unformatted: