Hangs with nvidia-driver.

[arrowdodger]

I've started experiencing hangs after 9.1-RC2 update. These hangs are
caused by indefinitly looping somewhere inside nvidia_drv.so. As time
passes, X server figures it out somehow and escapes from loop, but after
short time everything hangs again.

I've tried downgrading to RC1 and upgrading to RC3, downgrading NVIDIA
driver to 295 and upgrading to the latest, downgrading Xorg and friends to
1.7.7 and upgrading to the latest with WITHOUT_NOUVEAU set. Nothing helped.

Interesting lines from dmesg:

NVRM: Xid (0000:01:00): 8, Channel 00000000
NVRM: Xid (0000:01:00): 8, Channel 00000000
NVRM: Xid (0000:01:00): 8, Channel 00000000
NVRM: Xid (0000:01:00): 13, 0000 e0014a00 0000004a 00000100 ffffffff
00000010
NVRM: Xid (0000:01:00): 12, COCOD 00000000 e0013900 00000039 00000300
00000006

Xorg.0.log:

(WW) Nov 05 10:54:18 NVIDIA(0): WAIT (1, 6, 0x8000, 0x0000f7a0, 0x0000fb54)
(WW) Nov 05 10:54:26 NVIDIA(0): WAIT (0, 6, 0x8000, 0x000006e8, 0x000006e8)
(WW) Nov 05 10:54:29 NVIDIA(0): WAIT (2, 6, 0x8000, 0x000006e8, 0x00000814)
(WW) Nov 05 10:54:37 NVIDIA(0): WAIT (2, 6, 0x8000, 0x0000bc38, 0x0000c520)
(WW) Nov 05 10:55:10 NVIDIA(0): WAIT (0, 7, 0x8000, 0x00005c30, 0x00005c30)
(WW) Nov 05 10:55:13 NVIDIA(0): WAIT (0, 7, 0x8000, 0x00005c54, 0x00005c54)
(WW) Nov 05 10:55:16 NVIDIA(0): WAIT (0, 7, 0x8000, 0x00005c78, 0x00005c78)
[mi] EQ overflowing. The server is probably stuck in an infinite loop.
(WW) Nov 05 10:55:41 NVIDIA(0): WAIT (2, 6, 0x8000, 0x0000d100, 0x0000e444)
(WW) Nov 05 10:55:48 NVIDIA(0): WAIT (1, 6, 0x8000, 0x0000d100, 0x0000e444)
(WW) Nov 05 10:55:51 NVIDIA(0): WAIT (2, 6, 0x8000, 0x0000d100, 0x0000f8c0)
(WW) Nov 05 10:56:04 NVIDIA(0): WAIT (2, 6, 0x8000, 0x0000c340, 0x0000d534)
(WW) Nov 05 10:56:18 NVIDIA(0): WAIT (2, 6, 0x8000, 0x0000eb10, 0x0000eee4)
[mi] EQ overflowing. The server is probably stuck in an infinite loop.

uname -a:

FreeBSD alore 9.1-RC1 FreeBSD 9.1-RC1 #0: Tue Aug 14 03:56:40 UTC 2012
root at obrian.cse.buffalo.edu:/usr/obj/usr/src/sys/GENERIC i386

My video card is GeForce 6600.
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