Panic: Use-after-free in bfe

Hi!

I have been suggested to escalate my problem to this list. I have this
problem both on -STABLE and -CURRENT.
On stable_at_ the thread is titled 'if_bfe/uhci: storm interrupt Fatal trap
12'

Here is a description of the problem:
I have a new laptop: a DELL Inspiron 9100 with a builtin "Broadcom
BCM4401 Fast Ethernet" which is attached to the bfe driver.
As soon as I give this NIC an adress, the system panic.
The laptop has a Pentium 4HT 3.2Ghz and 1.5Gb of memory.

Here is a handwritten typescript of the panic while using february
CURRENT-SNAP in Fixit-mode.

 1- I boot with the snapshot miniinst
 2- Selecting keymap (french accent)
 3- Fixit mode
 4- Emergency shell
 5- using Alt-F4 to go to the terminal
 6- typing: "ifconfig bfe0 192.168.1.1" => the shell freeze
 7- using Alt-F1 to go back to the 1st terminal where there is a panic
    message:
    <<<<<<< handwritten typescript
 cpuid = 0
 KDB: enter: panic
 [thread pid 29 tid 100030 ]
 Stopped at      kdb_enter+0x2b: nop
 db> where  -- command entered
 Tracing pid 29 tid 100030 td 0xc2ff1000
 kdb_enter(c0823108) at kdb_enter+0x2b
 panic(c083ca28,deadc000,c07c9462,0,80000000) at panic+0x127
 vm_fault(c1459000,deadc000,1,0,c2ff1000) at vm_fault+0x1e1
 trap_pfault(e5e61c50,0,deadc0ee) at trap_pfault+0x13b
 trap(c0830018,10,10,c3105000,c3102400) at trap+0x335
 calltrap() at calltrap+0x5
 --- trap 0xc, eip = 0xc07a810, esp = 0xe5e61c90, ebp = 0xe5e61c98 ---
 _bus_dmamap_unload(c3102400,c3104540) at _bus_dmamap_unload+0x16
 bfe_rx_ring_free(c3105000,c3105000,c3105000,e5e61cd8,c04dd0a3) at
    bfe_rx_ring_free+0x50
 bfe_stop(c3105000,400,c3105000,e5e61cf4,c04dcae7) at bfe_stop+0x45
 bfe_init_locked(c3105000) at bfe_init_locked+0x33
 bfe_intr(c3105000) at bfe_intr+0x9f
 ithread_loop(c2fe9500,e5e61d48,c2fe9500,c0601a54,0) at
    ithread_loop+0x120
 fork_exit(c0601a54,c2fe9500,e5e61d48) at fork_exit+0xa4
 fork_trampoline() at fork_trampoline+0x8
 --- trap 0x1, eip = 0, esp = 0xe5e61d7c, ebp = 0 ---
 db>
     >>>>>>

On -STABLE the panic is preceded by a "storm interrupt" on "irq18: bfe0
uhci2" and dmesg reports:

bfe0: <Broadcom BCM4401 Fast Ethernet> mem 0xfaffe000-0xfaffffff irq 18 at device 0.0 on pci2
bfe0: Ethernet address: 00:11:43:65:ab:d1
miibus0: <MII bus> on bfe0
bmtphy0: <BCM4401 10/100baseTX PHY> on miibus0
bmtphy0:  10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, auto


For the moment, I use NDISulator to have this NIC working and I am
compiling a new STABLE kernel with DDB and KDB.

Do not hesitate to ask me more information as long as I can provide them
using the fixit terminal on the miniinst SNAP.

Thanks

Phil.