panic in RELENG_5 em(4) driver

Hi,

I know this list should not be used for RELENG_5 related problems, but
given this seems to be a panic introduced in recent em(4) driver changes
(my previous 5.3 kernel worked like a charm), I thought this would be
more judicious to post on -current_at_.

%%%
    Fatal trap 12: page fault while in kernel mode
    fault virtual address   = 0xbfec52b0
    fault code              = supervisor read, page not present
    instruction pointer     = 0x8:0xc06db6c0
    stack pointer           = 0x10:0xd3fe9bc0
    frame pointer           = 0x10:0xd3fe9c24
    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         = 22 (irq11: pcm0 xl1, em0)
    [thread pid 22 tid 100016 ]
    Stopped at      bus_dmamap_load+0x377:  movl     PTmap(,%eax,4),%edx
    db> trace
    Tracing pid 22 tid 100016 td 0xc1997900
    bus_dmamap_load(c1c59780,0,b14ace22,7fe,c04a17ab) at bus_dmamap_load+0x377
    em_get_buf(55,c1a5b000,0,c199be20,d3fe9cc8) at em_get_buf+0xe5
    em_process_receive_interrupts(c1a5b000,fffffffe,0,c0852318,916) at em_process_receive_interrupts+0x1a7
    em_intr(c1a5b000,0,0,0,0) at em_intr+0x143
    ithread_loop(c1991880,d3fe9d38,0,0,0) at ithread_loop+0x19f
    fork_exit(c0556558a,c1991880,d3fe9d38) at fork_exit+0x7f
    fork_trampoline() at fork_trampoline+0x8
    --- trap 0x1, eip = 0, esp = 0xd3fe9d6c, ebp = 0 ---
%%%

Unfortunately, I have not been able to get a kernel dump.

Regards,
-- 
Jeremie Le Hen
< jeremie at le-hen dot org >< ttz at chchile dot org >