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Jaywalker 12-18-2010 07:31 PM

Kernel Panic with ProTools - Please Help
Hey, I've look around the whole of the internet for help and I couldn't find a fix for this problem. So sorry if this has already been covered.

Basically when I run Avid - ProTools 8 on my iMac and the music session gets quite heavy for the mac to run it drops to the "you need to restart your computer" screen. I've tried repairing the mac files with the Snow Leopard disk and it still crashes.

Any ideas on how to fix this problem?


Model Name: iMac
Model Identifier: iMac9,1
Processor Name: Intel Core 2 Duo
Processor Speed: 2.66 GHz
Number Of Processors: 1
Total Number Of Cores: 2
L2 Cache: 6 MB
Memory: 4 GB
Bus Speed: 1.07 GHz
Boot ROM Version: IM91.008D.B08
SMC Version (system): 1.44f0


Interval Since Last Panic Report: 25402 sec
Panics Since Last Report: 3
Anonymous UUID: 00EE7907-8796-4F14-92CA-211484403090

Sat Dec 18 23:48:43 2010
panic(cpu 1 caller 0x557f1d): "complete() while dma active"@/SourceCache/xnu/xnu-1504.9.17/iokit/Kernel/IOMemoryDescriptor.cpp:2273
Backtrace (CPU 1), Frame : Return Address (4 potential args on stack)
0x6cda3b78 : 0x21b50c (0x5d42fc 0x6cda3bac 0x223974 0x0)
0x6cda3bc8 : 0x557f1d (0x5dd808 0x0 0x6cda3c38 0x13ebc0a)
0x6cda3c08 : 0x5592bb (0xabb8000 0x0 0x984d 0x5e80)
0x6cda3c98 : 0x1afad34 (0xabb8000 0x6cda3cf4 0x1 0x0)
0x6cda3d28 : 0x1afaefb (0x9e0b000 0x120 0x320 0x8f00940)
0x6cda3d88 : 0x1afb09a (0x9e0b000 0x9f50000 0x966 0x960)
0x6cda3da8 : 0x1af6531 (0x9e0b000 0x9f50000 0x190 0x191)
0x6cda3e08 : 0x128b7d8 (0xaaf8600 0x6cf1d000 0x6ce66000 0x191)
0x6cda3e58 : 0x128b9fe (0xaaf8600 0x191 0x800 0x1)
0x6cda3e88 : 0x128c06b (0xaaf8600 0x52d1d000 0x6cda3ef8 0x224fc1)
0x6cda3ef8 : 0x1288a48 (0xaaf8600 0xf44e788 0x191 0x181d)
0x6cda3f48 : 0x1287086 (0x89b0600 0x8ef6680 0xe20e 0x29f54e)
0x6cda3f78 : 0x22fd09 (0x8ef6680 0xe20e 0x6cda3fc8 0x227966)
0x6cda3fc8 : 0x2a06cc (0x863ea0 0x0 0x10 0x0)
Kernel Extensions in backtrace (with dependencies):

BSD process name corresponding to current thread: kernel_task

Mac OS version:

Kernel version:
Darwin Kernel Version 10.5.0: Fri Nov 5 23:20:39 PDT 2010; root:xnu-1504.9.17~1/RELEASE_I386
System model name: iMac9,1 (Mac-F2218EA9)

System uptime in nanoseconds: 8673773173480
unloaded kexts: 423.91.27 (addr 0xee1000, size 0x1900544) - last unloaded 217770631808
loaded kexts:
com.digidesign.mbox2.driver 8.0.3f1 - last loaded 22644058221
com.paceap.kext.pacesupport.snowleopard 5.7.2
com.caiaq.driver.NIUSBMaschineControllerDriver 2.4.12
com.digidesign.iokit.DigiIO 8.0.3f1
com.digidesign.iokit.DigiDal 8.0.3f1
com.digidesign.mbox2.boot.driver 8.0.3f1 1.9.3d0 2.1.0 100.12.19 1.2.0 3.4.5 1.0.17 1.9.9f12 1.9.9f12 1.13 7.0.0 1.1.6 17 4.5.0d5 1.4.12 170.0.34 6.2.4 303.8 2.6.5 31 eZlib 1.0.0d1 1.6.3 1.5 4.7.1 4.1.7 426.36.1 2.1.5 2.0.15 4.1.7 4.1.5 1.4.0 1.3.1 1.3.5 1.6 1.3.5 1.4 t 105.13.0 1 0 2.1.11 105.13.0 141 162 162 2.3.8f7 1.9.9f12 17 10 14 10 10 20 1.0.8d0 6.2.4 2.7.6f4 2.0.3 74.2 2.3.8f7 10.0.3 1.7.9fc4 1.3 1.9.9f12 1.9.9f12 41 3.1.0d3 4.5.0d5 1.0.8d0 6.2.4 2.2 2.2 2.3.8f7 2.3.8f7 2.3.8f7 4.1.5 4.1.5 3.9.0 2.6.5 1.6 1.6 1.6 402.1 1.2.5 2.6.5 4.2.6 4.1.5 312 2.0.4 1.9 4.1.7 2.2.7 1.4.0 1.6.5 1.1 1.0.0d1 6 289 1.6.2 1.3.5 2.6 1.3.0
Model: iMac9,1, BootROM IM91.008D.B08, 2 processors, Intel Core 2 Duo, 2.66 GHz, 4 GB, SMC 1.44f0
Graphics: NVIDIA GeForce 9400, NVIDIA GeForce 9400, PCI, 256 MB
Memory Module: global_name
AirPort: spairport_wireless_card_type_airport_extreme (0x14E4, 0x8E), Broadcom BCM43xx 1.0 (
Bluetooth: Version 2.3.8f7, 2 service, 19 devices, 1 incoming serial ports
Network Service: Ethernet, Ethernet, en0
Serial ATA Device: WDC WD3200AAJS-40H3A0, 298.09 GB
Serial ATA Device: HL-DT-ST DVDRW GA11N
USB Device: Built-in iSight, 0x05ac (Apple Inc.), 0x8502, 0x24400000
USB Device: USB2.0 Hub, 0x05e3 (Genesys Logic, Inc.), 0x0608, 0x24300000
USB Device: Maschine Controller, 0x17cc, 0x0808, 0x24310000
USB Device: USB Keystation 49e, 0x0a4d, 0x0090, 0x24320000
USB Device: Mbox 2, 0x0dba, 0x3000, 0x04100000
USB Device: IR Receiver, 0x05ac (Apple Inc.), 0x8242, 0x04500000
USB Device: iLok, 0x088e, 0x5036, 0x06400000
USB Device: BRCM2046 Hub, 0x0a5c (Broadcom Corp.), 0x4500, 0x06100000
USB Device: Bluetooth USB Host Controller, 0x05ac (Apple Inc.), 0x8215, 0x06110000

chscag 12-18-2010 08:54 PM

It looks like a memory fault. Use your Snow Leopard startup DVD to perform the Apple Hardware Test. Run the extended tests. Post any errors it reports back. See this LINK.

You might also want to run Memtest OS X. It's free, download from here.

Jaywalker 12-23-2010 01:18 PM

I've done the test and it said that there was no trouble??

So its not the hardware. Is there any way of testing if there are any corrupt files?

Got any other ideas?

chscag 12-23-2010 01:57 PM

You can check for corrupt files by using Disk Utility after booting from your startup DVD. "Verify and Repair" However, I don't think it's a corrupt file that's causing the KP.


Sat Dec 18 23:48:43 2010
panic(cpu 1 caller 0x557f1d): "complete() while dma active"@/SourceCache/xnu/xnu-1504.9.17/iokit/Kernel/IOMemoryDescriptor.cpp:2273
If you notice above in bold it says "while dma active". That means the fault has occurred while direct memory access (dma) is active. Something is causing that to happen and it could be intermittent. You might try pulling the memory modules and re-seating them to see if that helps.

Jaywalker 12-24-2010 03:17 PM


Originally Posted by chscag (Post 1157481)
You might try pulling the memory modules and re-seating them to see if that helps.

Sorry, what do you mean by this? do you mean taking out the ram and putting it back in again?

bobtomay 12-24-2010 03:35 PM


Note: I do not use Pro Tools.

However, after not much research, I'd suggest updating ProTools. It appears it is having issues with either/both the USB and audio drivers causing the memory errors. ProTools has put out multiple updates pertaining to these two.

Also, looks like you have version 8.0.3 and running Snow Leopard. Best I could tell, the oldest version they're showing as compatible with SL is 8.0.4. I'd also be looking to their forums for info and recommendations.

Jaywalker 12-24-2010 04:22 PM

Yeah! I've just found out there is an update which I need to get. I had the 8.0.3 and the 8.0.4 has an update saying - - - -

"Kernel Panic when shutting down Mac if Mbox 2 was disconnected previously (Item #PTSW-56617)
OS/Platform: Mac/LE Area: Mbox 2 Family (USB) Mac computers would kernel panic (crash) on shut down if the computer was started with an Mbox 2 USB device (Mbox 2, Mbox 2 Mini, or Mbox 2 Micro) attached, and the Mbox 2 is disconnected prior to shutdown.

Core Audio Manager crashes when launching some 3rd party applications with Mbox 2 devices (Item #PTSW-125131) OS/Platform: Mac/LE Area: Core Audio
Core Audio Manager crashes when launching applications such as FM8, Massive, or Absynth 5 when an Mbox 2 device is connected. This would occur if Core Audio Manager was installed and Digi CoreAudio Device was selected in System Preferences>Sound>Output. The crash has been resolved. However, because Mbox 2 devices are full Core Audio clients, it is not necessary to use Core Audio Manager with them (this is only necessary with Digi 002, 003, and Pro Tools HD). With Mbox 2 family devices, you can simply select Mbox 2 in System Preferences>Sound>Output."

So this update might fix it.

I'll let you know if its truly fixed.

Thank you both very much for your help!

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