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Please help me diagnose a freezing issue

Flash SWT

Flash SWT

macrumors 6502
Original poster
Mar 14, 2009
459
23
Houston, TX
Howdy folks, I'm hoping for a little guidance here.

OS X 10.6.8
2009 Mac Pro (4,1)
8 core 2.26
20 GB RAM
Radeon HD 4870, dual monitors
Samsung 840 PRO SSD, 4 spinning hard drives

The most recent hardware changes were an upgrade from 12 to 20 GB of RAM and the SSD boot drive but that was back in December.

In the past I've occasionally had my Mac freeze while playing Team Fortress 2. When this happens the mouse still moves but I can't get anything to change on the screen. I can SSH in and see the WindowServer process is "stuck." I can reboot the machine over SSH.

In the past few weeks my computer has started freezing more frequently. While it has happened in TF2 it has also happened while scrolling webpages and today watching the WWDC stream. Much more light duty "office stuff."

These freezes kill the machine completely. The mouse doesn't move, the screen is frozen. The computer doesn't respond to pings and is dead on the network so I can't even connect via SSH to see what the issue might be. Holding down the power button is the only fix. I've let it sit for 30 minutes and it never unfreezes.

I wondered if it might be the SSD so I've booted off a clone of my boot partition on a spinning HD and un-mounted the SSD. It still froze. I think that is enough to rule out the SSD?

My initial thought is the video card. It always seems to happen when there is motion on the screen and occasionally before it happens scrolling or motion gets really choppy. One time the screens flickered a lot after the hard-restart but only that once. I'm not anxious to spend $500 on a new video card unless I'm pretty sure that is the issue.

So, any thoughts? Any tests to try? Any certain log file I can check after the next freeze/hard restart? I appreciate any and all help.
 
Anybody?

I actually saw the start of the Kernel Panic screen begin to scroll down onto my screen before it froze completely this time. So I rebooted without my normal fsck and got this error log:

Code: 
Interval Since Last Panic Report:  26465602 sec
Panics Since Last Report:          1
Anonymous UUID:                    E5C9E008-3566-44EE-A303-DCB268BF951C

Thu Jun 13 00:09:22 2013
Machine-check capabilities (cpu 2) 0x0000000000001c09:
 family: 6 model: 26 stepping: 5 microcode: 17
 Intel(R) Xeon(R) CPU           E5520  @ 2.27GHz
 9 error-reporting banks
 threshold-based error status present
 extended corrected memory error handling present
Machine-check status 0x0000000000000004:
 machine-check in progress
MCA error-reporting registers:
 IA32_MC0_STATUS(0x401): 0x0000000000000800 invalid
 IA32_MC1_STATUS(0x405): 0x0000000000000800 invalid
 IA32_MC2_STATUS(0x409): 0x0000000000000000 invalid
 IA32_MC3_STATUS(0x40d): 0x0000000000000000 invalid
 IA32_MC4_STATUS(0x411): 0x0000000000000000 invalid
 IA32_MC5_STATUS(0x415): 0x0000000000000000 invalid
 IA32_MC6_STATUS(0x419): 0x0000000000000000 invalid
 IA32_MC7_STATUS(0x41d): 0x0000000000000000 invalid
 Package 0 logged:
 IA32_MC8_STATUS(0x421): 0x0000000000000000 invalid
 Package 1 logged:
 IA32_MC8_STATUS(0x421): 0x0000000000000000 invalid
panic(cpu 2 caller 0x2aaf41): Machine Check at 0x01224893, thread:0x2ef9b000, trapno:0x12, err:0x0,registers:
CR0: 0x80010033, CR2: 0x00709000, CR3: 0x00100000, CR4: 0x00000660
EAX: 0x00000001, EBX: 0x01236da8, ECX: 0x00000001, EDX: 0x01236940
ESP: 0x99f23ab0, EBP: 0x99f23b08, ESI: 0x00000000, EDI: 0x1cf2b800
EFL: 0x00000002, EIP: 0x01224893

Backtrace (CPU 2), Frame : Return Address (4 potential args on stack)
0x8be36fb8 : 0x21b837 (0x5dd7fc 0x8be36fec 0x223ce1 0x0) 
0x8be37008 : 0x2aaf41 (0x59dfe4 0x59e0d1 0x1224893 0x2ef9b000) 
0x8be370f8 : 0x2a29f2 (0x1 0x6b2f3c65 0x3c3e7965 0x65757274) 
0x99f23b08 : 0x121bee7 (0x8bd7e0a8 0x1 0x1cf2b800 0x0) 
0x99f23be8 : 0x121d850 (0xc97143c 0x3162 0x2 0x0) 
0x99f23ce8 : 0x2ad0c5 (0xffffffff 0x7fffffff 0x99f23df8 0x8bd8d000) 
0x99f23d08 : 0x225bba (0x8bd8d49c 0xc4a7ed6 0x3162 0x8bd8d488) 
0x99f23d68 : 0x22698c (0x1 0x2ef9b000 0x1cf714b0 0x0) 
0x99f23dd8 : 0x2275b0 (0x2ef9b01c 0x3162 0xc476f2d 0x1) 
0x99f23e48 : 0x227654 (0x22a88f 0x0 0x0 0x1e) 
0x99f23e68 : 0x22ac50 (0x22a88f 0x0 0x80 0x2) 
0x99f23ec8 : 0x22aed0 (0x0 0x0 0x0 0x2ab22a) 
0x99f23ef8 : 0x22af12 (0x2303 0x3003 0x2ab22a 0x2) 
0x99f23f18 : 0x295914 (0x99f23f44 0x0 0x0 0x0) 
0x99f23fc8 : 0x2a20f8 (0x2edfde20 0x0 0x10 0x0) 
      Kernel Extensions in backtrace (with dependencies):
         com.apple.driver.AppleIntelCPUPowerManagement(142.6.0)@0x121a000->0x123dfff

BSD process name corresponding to current thread: ts3client_mac

Mac OS version:
10K549

Kernel version:
Darwin Kernel Version 10.8.0: Tue Jun  7 16:33:36 PDT 2011; root:xnu-1504.15.3~1/RELEASE_I386
System model name: MacPro4,1 (Mac-F221BEC8)

System uptime in nanoseconds: 54297183168698
unloaded kexts:
com.apple.iokit.IOFireWireSBP2	4.0.6 (addr 0x8b872000, size 0x69632) - last unloaded 46812884678386
loaded kexts:
org.virtualbox.kext.VBoxNetAdp	4.2.10 - last loaded 46653969325468
org.virtualbox.kext.VBoxNetFlt	4.2.10
org.virtualbox.kext.VBoxUSB	4.2.10
com.vmware.kext.vmnet	2.0.4
org.virtualbox.kext.VBoxDrv	4.2.10
com.vmware.kext.vmioplug	2.0.4
com.vmware.kext.vmci	2.0.4
com.vmware.kext.vmx86	2.0.4
com.razer.driver.RazerDeathAdderDriver	3.0.0
com.apple.filesystems.autofs	2.1.0
com.apple.filesystems.msdosfs	1.6.3
com.apple.driver.AppleHWSensor	1.9.3d0
com.apple.driver.AppleTyMCEDriver	1.0.2d2
com.apple.driver.AGPM	100.12.31
com.apple.driver.AppleMikeyHIDDriver	1.2.0
com.apple.filesystems.ntfs	3.4
com.apple.driver.AppleHDA	2.0.5f14
com.apple.driver.AppleUpstreamUserClient	3.5.7
com.apple.driver.AppleMCCSControl	1.0.20
com.apple.driver.AppleMikeyDriver	2.0.5f14
com.apple.driver.AudioAUUC	1.57
com.apple.kext.ATIFramebuffer	6.3.6
com.apple.Dont_Steal_Mac_OS_X	7.0.0
com.apple.driver.AudioIPCDriver	1.1.6
com.apple.driver.AppleIntelNehalemProfile	11
com.apple.driver.ACPI_SMC_PlatformPlugin	4.7.0a1
com.apple.driver.AppleLPC	1.5.1
com.apple.ATIRadeonX2000	6.3.6
com.apple.driver.AppleRAID	4.0.6
com.apple.iokit.SCSITaskUserClient	2.6.8
com.apple.BootCache	31.1
com.apple.AppleFSCompression.AppleFSCompressionTypeZlib	1.0.0d1
com.apple.driver.AppleFWOHCI	4.7.3
com.apple.iokit.IOAHCIBlockStorage	1.6.4
com.apple.driver.AirPortBrcm43224	428.42.4
com.apple.driver.Intel82574L	2.1.8b1
com.apple.driver.AppleUSBHub	4.2.4
com.apple.driver.AppleAHCIPort	2.1.7
com.apple.driver.AppleUSBEHCI	4.2.4
com.apple.driver.AppleUSBUHCI	4.2.0
com.apple.driver.AppleEFINVRAM	1.4.0
com.apple.driver.AppleRTC	1.3.1
com.apple.driver.AppleHPET	1.5
com.apple.driver.AppleACPIButtons	1.3.6
com.apple.driver.AppleSMBIOS	1.7
com.apple.driver.AppleACPIEC	1.3.6
com.apple.driver.AppleAPIC	1.4
com.apple.driver.AppleIntelCPUPowerManagementClient	142.6.0
com.apple.security.sandbox	1
com.apple.security.quarantine	0
com.apple.nke.applicationfirewall	2.1.14
com.apple.driver.AppleIntelCPUPowerManagement	142.6.0
com.apple.driver.AppleProfileReadCounterAction	17
com.apple.driver.DspFuncLib	2.0.5f14
com.apple.driver.AppleProfileTimestampAction	10
com.apple.driver.AppleProfileThreadInfoAction	14
com.apple.driver.AppleProfileRegisterStateAction	10
com.apple.driver.AppleProfileKEventAction	10
com.apple.driver.AppleProfileCallstackAction	20
com.apple.driver.AppleSMBusController	1.0.10d0
com.apple.iokit.IOFireWireIP	2.0.3
com.apple.driver.AppleUSBAudio	2.7.6f6
com.apple.iokit.IOSurface	74.2
com.apple.iokit.IOBluetoothSerialManager	2.4.5f3
com.apple.iokit.IOSerialFamily	10.0.3
com.apple.iokit.IOAudioFamily	1.8.3fc2
com.apple.kext.OSvKernDSPLib	1.3
com.apple.driver.AppleHDAController	2.0.5f14
com.apple.iokit.IOHDAFamily	2.0.5f14
com.apple.iokit.AppleProfileFamily	41
com.apple.driver.AppleSMC	3.1.0d5
com.apple.driver.IOPlatformPluginFamily	4.7.0a1
com.apple.driver.AppleSMBusPCI	1.0.10d0
com.apple.iokit.IONDRVSupport	2.2.1
com.apple.kext.ATI4800Controller	6.3.6
com.apple.kext.ATISupport	6.3.6
com.apple.iokit.IOGraphicsFamily	2.2.1
com.apple.driver.BroadcomUSBBluetoothHCIController	2.4.5f3
com.apple.driver.AppleUSBBluetoothHCIController	2.4.5f3
com.apple.iokit.IOBluetoothFamily	2.4.5f3
com.apple.driver.AppleUSBHIDKeyboard	141.5
com.apple.driver.AppleHIDKeyboard	141.5
com.apple.iokit.IOUSBHIDDriver	4.2.0
com.apple.driver.AppleUSBMergeNub	4.2.4
com.apple.driver.AppleUSBComposite	3.9.0
com.apple.iokit.IOSCSIMultimediaCommandsDevice	2.6.8
com.apple.iokit.IOBDStorageFamily	1.6
com.apple.iokit.IODVDStorageFamily	1.6
com.apple.iokit.IOCDStorageFamily	1.6.1
com.apple.driver.XsanFilter	402.1
com.apple.iokit.IOFireWireFamily	4.2.6
com.apple.iokit.IOAHCISerialATAPI	1.2.6
com.apple.iokit.IOSCSIArchitectureModelFamily	2.6.8
com.apple.iokit.IO80211Family	320.1
com.apple.iokit.IONetworkingFamily	1.10
com.apple.iokit.IOUSBUserClient	4.2.4
com.apple.iokit.IOAHCIFamily	2.0.6
com.apple.iokit.IOUSBFamily	4.2.4
com.apple.driver.AppleEFIRuntime	1.4.0
com.apple.iokit.IOHIDFamily	1.6.6
com.apple.iokit.IOSMBusFamily	1.1
com.apple.kext.AppleMatch	1.0.0d1
com.apple.security.TMSafetyNet	6
com.apple.driver.DiskImages	289
com.apple.iokit.IOStorageFamily	1.6.3
com.apple.driver.AppleACPIPlatform	1.3.6
com.apple.iokit.IOPCIFamily	2.6.5
com.apple.iokit.IOACPIFamily	1.3.0

I see a reference in there to the Team Speak 3 client, but this is the first time I've used it in months so it can't be the common cause.
 
Nobody is willing to help me try to fix this problem?

I got another report after a freeze just now:

Code: 
Interval Since Last Panic Report:  419755 sec
Panics Since Last Report:          1
Anonymous UUID:                    E5C9E008-3566-44EE-A303-DCB268BF951C

Tue Jun 25 10:47:03 2013
Machine-check capabilities (cpu 0) 0x0000000000001c09:
 family: 6 model: 26 stepping: 5 microcode: 17
 Intel(R) Xeon(R) CPU           E5520  @ 2.27GHz
 9 error-reporting banks
 threshold-based error status present
 extended corrected memory error handling present
Machine-check status 0x0000000000000004:
 machine-check in progress
MCA error-reporting registers:
 IA32_MC0_STATUS(0x401): 0x0000000000000800 invalid
 IA32_MC1_STATUS(0x405): 0x0000000000000800 invalid
 IA32_MC2_STATUS(0x409): 0x0000000000000000 invalid
 IA32_MC3_STATUS(0x40d): 0x0000000000000000 invalid
 IA32_MC4_STATUS(0x411): 0x0000000000000000 invalid
 IA32_MC5_STATUS(0x415): 0x0000000000000000 invalid
 IA32_MC6_STATUS(0x419): 0x0000000000000000 invalid
 IA32_MC7_STATUS(0x41d): 0x0000000000000000 invalid
 Package 0 logged:
 IA32_MC8_STATUS(0x421): 0x0000000000000000 invalid
 Package 1 logged:
 IA32_MC8_STATUS(0x421): 0x0000000000000000 invalid
panic(cpu 0 caller 0x2aaf41): Machine Check at 0x0121c94c, thread:0x1d0193d4, trapno:0x12, err:0x0,registers:
CR0: 0x8001003b, CR2: 0x8c900000, CR3: 0x00100000, CR4: 0x00000668
EAX: 0x2fff3b6e, EBX: 0x00000a81, ECX: 0x2b8d5b5e, EDX: 0x00000a61
ESP: 0x0010bd00, EBP: 0x0010bd48, ESI: 0x1cf20000, EDI: 0x00000001
EFL: 0x00000006, EIP: 0x0121c94c

Backtrace (CPU 0), Frame : Return Address (4 potential args on stack)
0x819e18 : 0x21b837 (0x5dd7fc 0x819e4c 0x223ce1 0x0) 
0x819e68 : 0x2aaf41 (0x59dfe4 0x59e0d1 0x121c94c 0x1d0193d4) 
0x819f58 : 0x2a29f2 (0x1 0x0 0x0 0x0) 
0x10bd48 : 0x2b39af (0x8bdae0a8 0x21b10787 0x10bdb8 0x37d7b7bd) 
0x10bd68 : 0x22611b (0xc 0x0 0x0 0x1d049b7c) 
0x10bdb8 : 0x22620d (0x1d049b7c 0x0 0x10be48 0x0) 
0x10bdd8 : 0x232b01 (0x1d049b7c 0x0 0x147 0x2a0577) 
0x10be18 : 0x226b39 (0x84a84130 0x1d102b1c 0x0 0x552626) 
0x10be48 : 0x55268c (0x1d102b1c 0x1 0x0 0x0) 
0x10be68 : 0xff1194 (0x1d102b00 0x0 0x10bea8 0x0) 
0x10be98 : 0x56ac20 (0x1d0ba400 0x0 0x1cffd900 0x0) 
0x10bee8 : 0x10045bb (0x1d0e3a80 0x0 0x1d0e3a80 0x0) 
0x10bf18 : 0xf9b213 (0x1cf7cf00 0x0 0x0 0x51) 
0x10bf38 : 0xfa6911 (0x51 0x0 0x10bf78 0x0) 
0x10bf58 : 0x580d96 (0x1cf59180 0x0 0x1cf6ba00 0x51) 
0x10bf78 : 0x2ab432 (0x51 0x8c15bd80 0x24d8 0x1) 
0x10bfd8 : 0x2a1c2e (0x8c15bd80 0x2a2a00 0x0 0x2a2a5b) 
0x8c15be18 : 0x225bba (0x0 0x37bd5d38 0x490 0x84bf28) 
0x8c15be78 : 0x22698c (0x1 0x1d0193d4 0x1cda5c58 0x5526cf) 
0x8c15bee8 : 0x2275b0 (0x1d0193f0 0x0 0xffffffff 0x0) 
0x8c15bf58 : 0x227631 (0x23014c 0x863ea0 0x0 0x2a45c9) 
0x8c15bf78 : 0x2302e6 (0x23014c 0x863ea0 0x0 0x0) 
0x8c15bfc8 : 0x2a179c (0x863ea0 0x0 0x10 0x0) 
      Kernel Extensions in backtrace (with dependencies):
         com.apple.driver.AppleAHCIPort(2.1.7)@0xfef000->0x1002fff
            dependency: com.apple.iokit.IOAHCIFamily(2.0.6)@0xfe9000
            dependency: com.apple.iokit.IOPCIFamily(2.6.5)@0x909000
         com.apple.driver.AppleAPIC(1.4)@0x1003000->0x1005fff
         com.apple.driver.AppleACPIPlatform(1.3.6)@0xf99000->0xfdbfff
            dependency: com.apple.iokit.IOACPIFamily(1.3.0)@0xba1000
            dependency: com.apple.iokit.IOPCIFamily(2.6.5)@0x909000

BSD process name corresponding to current thread: kernel_task

Mac OS version:
10K549

Kernel version:
Darwin Kernel Version 10.8.0: Tue Jun  7 16:33:36 PDT 2011; root:xnu-1504.15.3~1/RELEASE_I386
System model name: MacPro4,1 (Mac-F221BEC8)

System uptime in nanoseconds: 5017491382522
unloaded kexts:
com.apple.driver.AppleIntel8254XEthernet	2.1.3b1 (addr 0x11fd000, size 0x118784) - last unloaded 120883140220
loaded kexts:
org.virtualbox.kext.VBoxNetAdp	4.2.10
org.virtualbox.kext.VBoxNetFlt	4.2.10
org.virtualbox.kext.VBoxUSB	4.2.10
org.virtualbox.kext.VBoxDrv	4.2.10
com.vmware.kext.vmnet	2.0.4
com.vmware.kext.vmioplug	2.0.4
com.vmware.kext.vmci	2.0.4
com.vmware.kext.vmx86	2.0.4
com.razer.driver.RazerDeathAdderDriver	3.0.0
com.apple.filesystems.afpfs	9.7.1 - last loaded 4869448769785
com.apple.nke.asp_tcp	5.0
com.apple.nke.pptp	1.5
com.apple.filesystems.autofs	2.1.0
com.apple.filesystems.msdosfs	1.6.3
com.apple.driver.AppleHWSensor	1.9.3d0
com.apple.driver.AppleTyMCEDriver	1.0.2d2
com.apple.driver.AGPM	100.12.31
com.apple.driver.AppleMikeyHIDDriver	1.2.0
com.apple.filesystems.ntfs	3.4
com.apple.driver.AppleHDA	2.0.5f14
com.apple.driver.AppleMikeyDriver	2.0.5f14
com.apple.driver.AudioAUUC	1.57
com.apple.driver.AppleUpstreamUserClient	3.5.7
com.apple.driver.AppleMCCSControl	1.0.20
com.apple.kext.ATIFramebuffer	6.3.6
com.apple.Dont_Steal_Mac_OS_X	7.0.0
com.apple.driver.AudioIPCDriver	1.1.6
com.apple.driver.AppleIntelNehalemProfile	11
com.apple.driver.ACPI_SMC_PlatformPlugin	4.7.0a1
com.apple.driver.AppleLPC	1.5.1
com.apple.ATIRadeonX2000	6.3.6
com.apple.iokit.SCSITaskUserClient	2.6.8
com.apple.driver.AppleRAID	4.0.6
com.apple.BootCache	31.1
com.apple.AppleFSCompression.AppleFSCompressionTypeZ
Model: MacPro4,1, BootROM MP41.0081.B07, 8 processors, Quad-Core Intel Xeon, 2.26 GHz, 20 GB, SMC 1.39f5
Graphics: ATI Radeon HD 4870, ATI Radeon HD 4870, PCIe, 512 MB
Memory Module: global_name
AirPort: spairport_wireless_card_type_airport_extreme (0x14E4, 0x8E), Broadcom BCM43xx 1.0 (5.10.131.42.4)
Bluetooth: Version 2.4.5f3, 2 service, 12 devices, 1 incoming serial ports
Network Service: Ethernet 1, Ethernet, en0
PCI Card: ATI Radeon HD 4870, sppci_displaycontroller, Slot-1
Serial ATA Device: HL-DT-ST DVD-RW GH41N
Serial ATA Device: Samsung SSD 840 PRO Series, 238.47 GB
Serial ATA Device: WDC WD6400AAKS-41H2B0, 596.17 GB
Serial ATA Device: ST3750330NS, 698.64 GB
Serial ATA Device: WDC WD15EADS-00H7B0, 1.36 TB
Serial ATA Device: ST3750330NS, 698.64 GB
USB Device: Keyboard Hub, 0x05ac  (Apple Inc.), 0x1006, 0xfa200000 / 2
USB Device: Apple Keyboard, 0x05ac  (Apple Inc.), 0x0220, 0xfa220000 / 3
USB Device: USB 2.0 Hub [MTT], 0x1a40  (TERMINUS TECHNOLOGY INC.), 0x0201, 0xfd300000 / 2
USB Device: USB 2.0 Hub, 0x1a40  (TERMINUS TECHNOLOGY INC.), 0x0101, 0xfd370000 / 5
USB Device: USB <-> Radio Scanner Cable, 0x0403  (Future Technology Devices International Limited), 0x6001, 0xfd374000 / 7
USB Device: USB-Serial Controller, 0x067b  (Prolific Technology, Inc.), 0x2303, 0xfd373000 / 6
USB Device: Back-UPS RS 1500G FW:865.L3 .D USB FW:L3, 0x051d  (American Power Conversion), 0x0002, 0xfd310000 / 4
USB Device: Composite Device, 0x047f  (Plantronics, Inc.), 0xad01, 0xfd350000 / 3
USB Device: BRCM2046 Hub, 0x0a5c  (Broadcom Corp.), 0x4500, 0x5a100000 / 2
USB Device: Bluetooth USB Host Controller, 0x05ac  (Apple Inc.), 0x8215, 0x5a110000 / 4
USB Device: Razer DeathAdder, 0x1532, 0x0016, 0x1d100000 / 2
FireWire Device: built-in_hub, Up to 800 Mb/sec
FireWire Device: unknown_device, Unknown
 
666sheep said:
All three panic logs point on RAM without a doubt.
Click to expand...

Thank you for taking the time to reply.

I ran Rember and it says everything is OK (log below). Any other suggestions on what to try? 4 of the sticks are Apple OEM, the other 4 are OWC so if I can pinpoint a problem with one of them I should be able to get a replacement.

Code: 
Memtest version 4.22 (64-bit)
Copyright (C) 2004 Charles Cazabon
Copyright (C) 2004-2008 Tony Scaminaci (Macintosh port)
Licensed under the GNU General Public License version 2 only

Mac OS X 10.6.8 (10K549) running in multiuser mode
Memory Page Size: 4096
System has 16 Intel core(s) with SSE
Requested memory: 18761MB (19672952832 bytes)
Available memory: 18761MB (19672952832 bytes)
Allocated memory: 18761MB (19672952832 bytes) at local address 0x0000000101000000
Attempting memory lock... WARNING: Testing with unlocked memory may be slower and less reliable

ERROR: Memory lock failed - reason unknown.

Partitioning memory into 2 comparison buffers...
Buffer A: 9380MB (9836476416 bytes) starts at local address 0x0000000101000000
Buffer B: 9380MB (9836476416 bytes) starts at local address 0x000000034b4cb800

Running 1 test sequence... (CTRL-C to quit)

Test sequence 1 of 1:

Running tests on full 18761MB region...
  Stuck Address       :                 setting  1 of 16setting  4 of 16testing  4 of 16                ok
  Linear PRN          :    setting  1 of 16                ok
Running comparison tests using 9380MB buffers...
  Random Value        :     ok
  Compare XOR         :       ok
  Compare SUB         :       ok
  Compare MUL         :       ok
  Compare DIV         :       ok
  Compare OR          :       ok
  Compare AND         :       ok
  Sequential Increment:       ok
  Solid Bits          :                 setting  1 of 64                ok
  Block Sequential    :                   setting   1 of 256                    ok
  Checkerboard        :                 setting  1 of 64                ok
  Bit Spread          :                   setting   1 of 128                  ok
  Bit Flip            :                   setting   1 of 512ok
  Walking Ones        :                   setting   1 of 128                  ok
  Walking Zeroes      :                   setting   1 of 128                  ok

All tests passed!  Execution time: 7981 seconds.
 
Thanks again for your help Sheep. I ran a ton of RAM tests with no consistent results. I did have a single 4GB DIMM (in Slot 1) become undetectable by the systems more than once after a kernel panic.

I pulled this DIMM and ran with just 7 sticks (leaving Slot 4 empty as recommended by RAM Utility) for a couple weeks without any freezes. Seemed like that one DIMM which had previously been in Slot 1 was the issue so I RMA'ed it.

However I just got another Kernel Panic. Could RAM Slot 4 be the issue and not one particular DIMM?

Code: 
Interval Since Last Panic Report:  1243122 sec
Panics Since Last Report:          1
Anonymous UUID:                    E5C9E008-3566-44EE-A303-DCB268BF951C

Thu Aug  8 14:28:32 2013
Machine-check capabilities (cpu 0) 0x0000000000001c09:
 family: 6 model: 26 stepping: 5 microcode: 17
 Intel(R) Xeon(R) CPU           E5520  @ 2.27GHz
 9 error-reporting banks
 threshold-based error status present
 extended corrected memory error handling present
Machine-check status 0x0000000000000004:
 machine-check in progress
MCA error-reporting registers:
 IA32_MC0_STATUS(0x401): 0x0000000000000800 invalid
 IA32_MC1_STATUS(0x405): 0x0000000000000800 invalid
 IA32_MC2_STATUS(0x409): 0x0000000000000000 invalid
 IA32_MC3_STATUS(0x40d): 0x0000000000000000 invalid
 IA32_MC4_STATUS(0x411): 0x0000000000000000 invalid
 IA32_MC5_STATUS(0x415): 0x0000000000000000 invalid
 IA32_MC6_STATUS(0x419): 0x0000000000000000 invalid
 IA32_MC7_STATUS(0x41d): 0x0000000000000000 invalid
 Package 0 logged:
 IA32_MC8_STATUS(0x421): 0x0000000000000000 invalid
 Package 1 logged:
 IA32_MC
Model: MacPro4,1, BootROM MP41.0081.B07, 8 processors, Quad-Core Intel Xeon, 2.26 GHz, 20 GB, SMC 1.39f5
Graphics: ATI Radeon HD 4870, ATI Radeon HD 4870, PCIe, 512 MB
Memory Module: global_name
AirPort: spairport_wireless_card_type_airport_extreme (0x14E4, 0x8E), Broadcom BCM43xx 1.0 (5.10.131.42.4)
Bluetooth: Version 2.4.5f3, 2 service, 12 devices, 1 incoming serial ports
Network Service: Ethernet 1, Ethernet, en0
PCI Card: ATI Radeon HD 4870, sppci_displaycontroller, Slot-1
Serial ATA Device: HL-DT-ST DVD-RW GH41N
Serial ATA Device: Samsung SSD 840 PRO Series, 238.47 GB
Serial ATA Device: WDC WD6400AAKS-41H2B0, 596.17 GB
Serial ATA Device: ST3750330NS, 698.64 GB
Serial ATA Device: WDC WD15EADS-00H7B0, 1.36 TB
Serial ATA Device: ST3750330NS, 698.64 GB
USB Device: USB 2.0 Hub [MTT], 0x1a40  (TERMINUS TECHNOLOGY INC.), 0x0201, 0xfa200000 / 2
USB Device: Composite Device, 0x047f  (Plantronics, Inc.), 0xad01, 0xfa250000 / 5
USB Device: USB 2.0 Hub, 0x1a40  (TERMINUS TECHNOLOGY INC.), 0x0101, 0xfa270000 / 4
USB Device: USB-Serial Controller, 0x067b  (Prolific Technology, Inc.), 0x2303, 0xfa272000 / 7
USB Device: USB <-> Radio Scanner Cable, 0x0403  (Future Technology Devices International Limited), 0x6001, 0xfa271000 / 6
USB Device: Back-UPS RS 1500G FW:865.L3 .D USB FW:L3, 0x051d  (American Power Conversion), 0x0002, 0xfa210000 / 3
USB Device: Keyboard Hub, 0x05ac  (Apple Inc.), 0x1006, 0xfd300000 / 2
USB Device: Apple Keyboard, 0x05ac  (Apple Inc.), 0x0220, 0xfd320000 / 3
USB Device: BRCM2046 Hub, 0x0a5c  (Broadcom Corp.), 0x4500, 0x5a100000 / 2
USB Device: Bluetooth USB Host Controller, 0x05ac  (Apple Inc.), 0x8215, 0x5a110000 / 3
USB Device: Razer DeathAdder, 0x1532, 0x0016, 0x1d100000 / 2
FireWire Device: built-in_hub, Up to 800 Mb/sec
FireWire Device: unknown_device, Unknown
 
this is just my guess but it sounds to me like you have mismatched DIMMs. They will often test out fine but under load cause kernel panic and other anomalies. I would un-do the last memory upgrade and see what happens.
 
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