Proper way to shutdown a USB ethernet adapter?

LukeD_at_pobox.com
Date: 05/21/04

  • Next message: aekelly: "Limewire Port - Segmentation Fault" 
    Date: Fri, 21 May 2004 00:01:33 -0700 (PDT)
To: freebsd-questions@freebsd.org

    I'm running i386 5.2-CURRENT and using the axe driver to run a Netgear
    FA120 USB ethernet adapter.
    5.2-CURRENT FreeBSD 5.2-CURRENT #0: Tue May 18 16:11:06 PDT 2004

    It works great. I even figured out how to run usbd and modify usbd.conf
    to run ifconfig automatically to give it an ip address when I plug it in
    and take away the ip address when I unplug it.

    When it's up and running, ifconfig shows:
    axe0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
            inet6 fe80::209:5bff:febd:d01a%axe0 prefixlen 64 scopeid 0x1
            inet 192.168.10.100 netmask 0xffffff00 broadcast 192.168.10.255
            ether 00:09:5b:bd:d0:1a
            media: Ethernet autoselect (100baseTX)
            status: active

    The problem is that no matter what I try, every time I try to shut down
    the system, if this device is plugged in, the system will panic with a
    page fault when init terminates.
    I get the same panic whenever I run "ifconfig axe0 down".
    This happens regardless of whether I'm running usbd or not.
    This happens even if I "ifconfig axe0 delete" to remove the IP address
    before I shut down.
    The only way I've found to avoid the panic is to unplug the device before
    shutdown, and that's difficult to do remotely...

    Page faults during shutdowns are usually just a simple matter of memory
    being deallocated in the wrong order. If that's what this is, it may be
    something I could fix. Any suggestions on how I might trace this down?

    The panic looks like this:
    Fatal trap 12: page fault while in kernel mode
    cpuid = 0; apic id = 00
    fault virtual address = 0xdeadc0e1
    fault code = supervisor read, page not present
    instruction pointer = 0x8 : 0xc0487e6e
    stack pointer = 0x10 : 0xc4888acc
    frame pointer = 0x10 : 0xc4888ae0
    code segment = base 0x0, limit 0xfffff, type 0x1b
                   DPL 0, pres 1, def32 1, gran 1
    processor eflags = interrupt enabled, resume, IOPL = 0
    current process = 1 (init)
    kernel: type 12 trap, code = 0
    stopped at usb_transfer_complete+0xba: movzbl 0x3(%eax),%eax
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  • Next message: aekelly: "Limewire Port - Segmentation Fault"

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