Panics With My G4 Dual Processor Mirror Door Drive

[manxixe]

Hi, been getting this panic when playing unreal tournament 2004. my machine has a fresh copy of osx 4.2, and no peripherals except for a logitech usb wheel mouse. if more details needed, let me know thanks.
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panic(cpu 1 caller 0x000a4e68): simple lock (0x01b6264c) deadlock detection, pc=0x0003ed5c

latest stack backtrace for cpu 1:
backtrace:
0x00095544 0x00095a5c 0x0002683c 0x000a4e68 0x0003ed5c 0x0003f1f0 0x0003c4d8 0x0003cac0
0x0003d7d0 0x000b4158 0x000adb44 0x000ac0c8
proceeding back via exception chain:
exception state (sv=0x39df5c80)
pc=0x000af2f0; msr=0x00009030; dar=0xe7dd4000; dsisr=0x42000000; lr=0x00033c9c; r1=0x174d3d40; xcp=0x00000024 (0x900 - decrementer)
backtrace:
0x01b58c7c 0x00032b7c 0x0003c7e0 0x000a9694
exception state (sv=0x2ced2c80)
pc=0x00000000; msr=0x0000d030; dar=0x00000000; dsisr=0x00000000; lr=0x00000000; r1=0x00000000; xcp=0x00000000 (unknown)

kernel version:
darwin kernel version 8.2.0: fri jun 24 17:46:54 pdt 2005; root:xnu-792.2.4.obj~3/release_ppc
model: powermac3,6, bootrom 4.4.8f2, 2 processors, powerpc g4 (3.2), 1.25 ghz, 1 gb
graphics: ati radeon 9000 pro, aty,rv250, agp, 64 mb
memory module: dimm0/j21, 512 mb, ddr sdram, pc2600u-25330
memory module: dimm1/j22, 512 mb, ddr sdram, pc2600u-25330
modem: dash2, ucj, v.92, 1.0f, apple version 2.6.6
network service: built-in ethernet, ethernet, en0
parallel ata device: pioneer dvd-rw dvr-104,
parallel ata device: ibm-ic35l120avva07-0, 115.04 gb
usb device: soundsticks, harman/kardon, up to 12 mb/sec, 500 ma
usb device: hub, , up to 12 mb/sec, 500 ma
usb device: usb monitor, lg electronics inc., up to 1.5 mb/sec, 500 ma
usb device: hub in apple pro keyboard, mitsumi electric, up to 12 mb/sec, 500 ma
usb device: apple pro keyboard, mitsumi electric, up to 12 mb/sec, 250 ma
usb device: usb-ps/2 optical mouse, b16_b_02, up to 1.5 mb/sec, 500 ma

[bobw]

Deadlock

"deadlock is a situation in which two computer programs sharing the same resource are effectively preventing each other from accessing the resource, resulting in both programs ceasing to function."

Some info here