boot hangs with acpi enabled?

[Roman Pavlik]

> Could anyone who is experiencing a boot-time hang on 7-current with acpi
> enabled send some information?  First, be sure your system works with
> acpi disabled (hint.acpi.0.disabled="1"), otherwise it's something else.
> 
> Then, compile your kernel with:
> options DDB
> options KDB
> 
> Reboot with the new kernel and hit CTRL-ALT-ESC when the boot hangs.
> Type "trace" to get a stack trace as to what's hung.  Copy down those
> lines or take a small photo and send it back.

Sorry for _very_ late answer. Partially because docs.freebsd.org kiding
about chunk size it sends (http://www.freebsd.org/cgi/query-pr.cgi?pr=116660)
and our firewall really does not like it... 

I hit CTRL-ALT-ESC when the boot hangs, the result is:
KDB: enter: manual escape to debugger
[thread pid 18 tid 100008 ]
Stopped at      kdb_enter+0x32: leave
db> trace
Tracing pid 18 tid 100008 td 0xc50f4420
kdb_enter(c0a87315,4,1,0,1,...) at kdb_enter+0x32
scgetc(e3c9ec60,c07846fc,c50f4420,c0bfaae8,c50f44b8,...) at scgetc+0x54f
sckbdevent(c50f7c00,0,c0c1f060,c50ed680,e3c9ec88,...) at sckbdevent+0x204
kdbmux_intr(c50f7c00,0,c50ed698,e3c9ecb8,c077e12b,...) at kdbmux_intr+0x2b
kbdmux_kbd_intr(c50f7c00,1,c0a9c9bd,52,c51e5a1c,...) at kbdmux_kbd_intr+0x25
taskqueue_run(c51e5a00,e3c9ecf8,c0732445,0,0,...) at taskqueue_run+0x10b
taskqueue_swi_giant_run(0,0,c0a959fa,40b,c51e59e4,...) at taskqueue_swi_giant_run+0x13
ithread_loop(c51e6170,e3c9ed38,c0a95776,314,c50f3550,...) at ithread_loop+0x1b5
fork_exit(c0732290,c51e6170,e3c9ed38) at fork_exit+0xb8
fork_trampoline() at fork_trampoline+0x8
--- trap 0, eip = 0, esp = 0xe3c9ed70, ebp = 0 ---
db>

Regards,
--
Roman