Please help interpreting kernel panic message

Question

Hello.
Could anyone please help me to interpret the kernel panic message (below) I received today. I have had several such events recently, and I have already read and implemented the suggestions regarding resolving kernel panics listed on the X-Lab's X-FAQs website. I have run all the repair and diagnostic stuff that is usually recommended to other people posting questions about resolving kernel panics. I don't have anything plugged into my Mac except the keyboard and mouse, and I know that I could take my computer to a shop and have someone look it over.
My specific question is this: Can anyone interpret the actual content of this particular kernel panic message and give me any clue as to the likely source or cause of the problem, or what is happening?
I hope that no one is offended by my posting since I am not an expert who regularly uses this forum.
Thank you very much!
Unresolved kernel trap(cpu 0): 0x300 - Data access DAR=0x000000000000000C PC=0x00000000000A41A4
Latest crash info for cpu 0:
Exception state (sv=0x2763D280)
PC=0x000A41A4; MSR=0x00009030; DAR=0x0000000C; DSISR=0x40000000; LR=0x0001DB70; R1=0x1754B5A0; XCP=0x0000000C (0x300 - Data access)
Backtrace:
0x02485E00 0x0001A5D4 0x0001D668 0x0001ED70 0x0001FD70 0x00021604
0x00038180 0x002667B0 0x0027322C 0x000252AC 0x000ABDB8 0x00026D50 0x000A87BC 0x000A857C
0x000AB980
backtrace terminated - frame not mapped or invalid: 0xF0E0C410
Proceeding back via exception chain:
Exception state (sv=0x2763D280)
previously dumped as "Latest" state. skipping...
Exception state (sv=0x2FC69280)
PC=0x065E61B8; MSR=0x0008D030; DAR=0xE00F9000; DSISR=0x42000000; LR=0x065E61B8; R1=0xF0E0C410; XCP=0x00000007 (0x100 - System reset)
Kernel version:
Darwin Kernel Version 8.10.0: Wed May 23 16:50:59 PDT 2007; root:xnu-792.21.3~1/RELEASE_PPC
panic(cpu 0 caller 0xFFFF0003): 0x300 - Data access
Latest stack backtrace for cpu 0:
Backtrace:
0x000952D8 0x000957F0 0x00026898 0x000A8004 0x000AB980
Proceeding back via exception chain:
Exception state (sv=0x2763D280)
PC=0x000A41A4; MSR=0x00009030; DAR=0x0000000C; DSISR=0x40000000; LR=0x0001DB70; R1=0x1754B5A0; XCP=0x0000000C (0x300 - Data access)
Backtrace:
0x02485E00 0x0001A5D4 0x0001D668 0x0001ED70 0x0001FD70 0x00021604
0x00038180 0x002667B0 0x0027322C 0x000252AC 0x000ABDB8 0x00026D50 0x000A87BC 0x000A857C
0x000AB980
backtrace terminated - frame not mapped or invalid: 0xF0E0C410
Exception state (sv=0x2FC69280)
PC=0x065E61B8; MSR=0x0008D030; DAR=0xE00F9000; DSISR=0x42000000; LR=0x065E61B8; R1=0xF0E0C410; XCP=0x00000007 (0x100 - System reset)
Kernel version:
Darwin Kernel Version 8.10.0: Wed May 23 16:50:59 PDT 2007; root:xnu-792.21.3~1/RELEASE_PPCModel: PowerMac7,3, BootROM 5.1.8f7, 2 processors, PowerPC G5 (2.2), 2 GHz, 1 GB
Graphics: GeForce FX 5200, GeForce FX 5200, AGP, 64 MB
Memory Module: DIMM0/J11, 512 MB, DDR SDRAM, PC3200U-30330
Memory Module: DIMM1/J12, 512 MB, DDR SDRAM, PC3200U-30330
Modem: Jump, V.92, Version 1.0
Network Service: Built-in Ethernet, Ethernet, en0
Serial ATA Device: ST3160023AS, 149.05 GB
Parallel ATA Device: PIONEER DVD-RW DVR-107D
USB Device: Hub in Apple Pro Keyboard, Mitsumi Electric, Up to 12 Mb/sec, 500 mA
USB Device: Macally Optical iceMouse, Macally Peripherals, Up to 1.5 Mb/sec, 100 mA
USB Device: Apple Pro Keyboard, Mitsumi Electric, Up to 12 Mb/sec, 250 mA
USB Device: Hub, Up to 12 Mb/sec, 500 mA
USB Device: Studio Display, Up to 1.5 Mb/sec, 500 mA

Answer 1

Hi, Chris and Maxit —
Was this a one-time problem?
I claim no particular expertise, but I don't see much in the panic.log that helps to isolate a specific underlying cause.
That is, except for Maxit's rationale. Because the backtrace indicates that the exception occurred upon loading the IOAudioFamily .kext (driver, or extension "family"), related hardware &/or driver compatibility would typically be worth exploring. Please check to be sure that you've disconnected all non-critical peripherals & disabled login items and any "system enhancers" while you're troubleshooting this problem.
The 0x300 DAR (data access register) trap is probably the most common type of exception that causes kernel panics. It simply indicates that the processor couldn't perform a data memory access. This could be due to a programming issue or a hardware problem (e.g., "bad" RAM, HD corruption).
If the problem recurs without any more specific indication from a panic.log or, e.g., console.log entr(ies), I suggest you diligently work through the course of action presented in Resolving kernel panics.
Sorry I can't offer anything more magically insightful.
Good luck!
Dean
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