FreeBSD 8.0 amd64 with 8GB RAM (deadlock)

Howdy,

I played a bit with the 64bit driver under FreeBD-8.0 (RELENG_8).
RELEASE works perfect, after updating to RELENG_8 I get a hang, which
means, i can't start xorg with nvidia driver. Hang means that machine
stops responding completely, not reacting to keyboard input or network
pings.

 I have added all kernel debug stuff to my kernel [1] in hope to get
any more information.  As that didn't really help I then downgraded
day by day to find out which src/sys commit breaks it seems I found
it:
http://svn.freebsd.org/viewvc/base?view=revision&revision=200443
I wrote a mail to Konstantin (kib@) and explained him my problem,
he told me that he need more infomation. 
And he also said that he think that this commit is not related to
this problem but he liked to know more about this problem.

We attempted to debug the hung machine using kgdb over firewire. We
were able to successfully attach over firewire with kgdb before
starting X, but firewire host lost connection to the target upon start
of the X. It looks like whole machine become dead.

Upon detailed reading of the dmesg, the nvidia card appeared to share
the interrupt with on-board network controller. Disabling the
controller from the BIOS temporary (until next reboot) enabled the X
to start. Unfortunately, after the reboot, one of the USB controllers
was assigned IRQ18, used by the nvidia card, attempt to start X killed
the machine. We disabled USB in BIOS, and again, were able to start X
once until the reboot.

We were unable to found the way to force card to use MSI to confirm
the natural theory of interrupt sharing causing the hang.

Another test was to disable smp support. i've set kern.smp.disabled=1
in loader.conf nvidia started here and works fine.

About my Hardware:
I've a Asus M4A78T-E with 8 GB ram, the onboard gfx card
is disabled via BIOS. 
Nvidia card is a: GeForce 7300 GS


here my dmesg where nvidia failed: [3]
http://nopaste.unixfreunde.de/1130

here my dmesg where nvidia works:
http://miwi.homeunix.com/nvidia/dmesg.31.12_11_22.txt
http://miwi.homeunix.com/nvidia/vmstat_31_12_11_22.txt

pciconf -lv 
http://nopaste.unixfreunde.de/1131




# Debugging for use in -current
options 	KDB			# Enable kernel debugger support.
options 	DDB			# Support DDB.
options 	GDB			# Support remote GDB.
options 	INVARIANTS		# Enable calls of extra sanity checking
options 	INVARIANT_SUPPORT	# Extra sanity checks of internal structures, required by INVARIANTS
options 	WITNESS			# Enable checks to detect deadlocks and cycles
options 	WITNESS_SKIPSPIN	# Don't run witness on spinlocks for speed
options		DEBUG_LOCKS
options		DEBUG_VFS_LOCKS
options		DIAGNOSTIC
options		SW_WATCHDOG
#options		MP_WATCHDOG
options		KSTACK_PAGES=7
options		KDB_UNATTENDED
#options		BREAK_TO_DEBUGGER
options		ALT_BREAK_TO_DEBUGGER