Im hoping someone out there can help with this issue. We have World Community Grid running on all our lab pcs and recently we got 9 new mac minis with the Nvidia 330m graphics installed. When the screen saver is running the macs constantly freeze and throw kernel panics. I am attaching a system dump hopefully someone else has experienced these issues. Our other minis are using ATI cards and do not have this issue.


Interval Since Last Panic Report: -1353432 sec
Anonymous UUID: AF08D73F-0E41-4CD8-A6F1-DAC31D05631F

Wed May 11 12:53:09 2011
panic(cpu 0 caller 0x4ffa93): "OSObject::refcount: Attempting to retain a freed object"@/SourceCache/xnu/xnu-1504.9.26/libkern/c++/OSObject.cpp:174
Backtrace (CPU 0), Frame : Return Address (4 potential args on stack)
0x59edb3a8 : 0x21b50c (0x5d4438 0x59edb3dc 0x223974 0x0)
0x59edb3f8 : 0x4ffa93 (0x5d5a04 0x5d59e0 0x59edb428 0x220673)
0x59edb428 : 0x4ff6b5 (0x9f4d000 0x0 0x59edb458 0xc8fcc3)
0x59edb448 : 0xc7df55 (0x9f4d000 0x440b3000 0x59edb478 0xc8fd12)
0x59edb478 : 0x9cd8f5 (0x440b3000 0x9f4d000 0xbee60020 0x0)
0x59edb4b8 : 0x96fd3e (0x9088004 0x8be7a44 0x1 0x59edb558)
0x59edb518 : 0xb54a80 (0x9088004 0xc 0x1 0x59edb558)
0x59edb598 : 0xb544b5 (0x9088004 0x8d63c04 0xc 0xffffffff)
0x59edb628 : 0x155ff82 (0x9088004 0x8d63c04 0x6 0x2)
0x59edb6a8 : 0x155d1cc (0x9088004 0x9014004 0x1200 0x59edb93c)
0x59edb708 : 0x155e361 (0x9088004 0x9014004 0x1200 0x59edb93c)
0x59edb828 : 0x1569ff7 (0x9088004 0x9014004 0x1200 0x59edb93c)
0x59edb998 : 0x15adee3 (0x9088004 0x9014004 0x0 0x0)
0x59edbad8 : 0x15b4d72 (0x9088004 0x907e004 0xd58df5aa 0x682c)
0x59edbb38 : 0xb072bd (0x9088004 0x907e004 0x0 0x0)
0x59edbb78 : 0x9d6e63 (0x9088004 0x907e004 0x0 0x0)
0x59edbc18 : 0x9d346f (0x0 0x9 0x0 0x0)
0x59edbdc8 : 0x9d533e (0x0 0x600d600d 0x702a 0x59edbdf8)
0x59edbe98 : 0x969582 (0xc1d00011 0xaa910001 0x20802040 0x59edbee0)
0x59edbef8 : 0xd294eb (0x8e06400 0x59edbf4c 0x0 0x7)
0x59edbf58 : 0xd29696 (0x9199400 0xd30b54 0x59edbf78 0x2a358d)
0x59edbf78 : 0x22fd09 (0x9199400 0x0 0x0 0x1103)
0x59edbfc8 : 0x2a06cc (0x863ea0 0x0 0x10 0xa0acee4)
Kernel Extensions in backtrace (with dependencies):
com.apple.driver.AGPM(100.12.19)@0xd26000->0xd30fff
dependency: com.apple.iokit.IOGraphicsFamily(2.2)@0x938000
dependency: com.apple.iokit.IONDRVSupport(2.2)@0x95a000
dependency: com.apple.iokit.IOPCIFamily(2.6)@0x927000
com.apple.GeForce(6.2.6)@0xc55000->0xd0afff
dependency: com.apple.NVDAResman(6.2.6)@0x967000
dependency: com.apple.iokit.IONDRVSupport(2.2)@0x95a000
dependency: com.apple.iokit.IOPCIFamily(2.6)@0x927000
dependency: com.apple.iokit.IOGraphicsFamily(2.2)@0x938000
com.apple.nvidia.nv50hal(6.2.6)@0x1477000->0x188bfff
dependency: com.apple.NVDAResman(6.2.6)@0x967000
com.apple.NVDAResman(6.2.6)@0x967000->0xc54fff
dependency: com.apple.iokit.IOPCIFamily(2.6)@0x927000
dependency: com.apple.iokit.IONDRVSupport(2.2)@0x95a000
dependency: com.apple.iokit.IOGraphicsFamily(2.2)@0x938000

BSD process name corresponding to current thread: kernel_task

Mac OS version:
10J567

Kernel version:
Darwin Kernel Version 10.6.0: Wed Nov 10 18:13:17 PST 2010; root:xnu-1504.9.26~3/RELEASE_I386
System model name: Macmini4,1 (Mac-F2208EC8)

System uptime in nanoseconds: 114567417661868
unloaded kexts:
com.apple.driver.AppleMCP89RootPortPM 1.11 (addr 0x124f000, size 0x20480) - last unloaded 99894902684
loaded kexts:
com.mcafee.kext.Virex 1.0.0d1 - last loaded 25189221106
com.faronics.driver.DFXDriver_10_4 4.6.1f98
com.faronics.driver.DFXDriver 4.6.1f98
com.apple.driver.AppleHWSensor 1.9.3d0
com.apple.filesystems.autofs 2.1.0
com.apple.driver.ApplePlatformEnabler 2.0.2d1
com.apple.driver.AGPM 100.12.19
com.apple.driver.AppleMikeyHIDDriver 1.2.0
com.apple.driver.AppleHDA 1.9.9f12
com.apple.driver.AudioAUUC 1.13
com.apple.driver.AppleMikeyDriver 1.9.9f12
com.apple.driver.AppleLPC 1.4.12
com.apple.Dont_Steal_Mac_OS_X 7.0.0
com.apple.iokit.CHUDUtils 364
com.apple.iokit.CHUDProf 366
com.apple.driver.AudioIPCDriver 1.1.6
com.apple.driver.AppleIntelPenrynProfile 17.1
com.apple.driver.ACPI_SMC_PlatformPlugin 4.5.0d5
com.apple.driver.AppleUpstreamUserClient 3.4.5
com.apple.driver.AppleMCCSControl 1.0.17
com.apple.GeForce 6.2.6
com.apple.driver.AppleIRController 303.8
com.apple.iokit.SCSITaskUserClient 2.6.5
com.apple.iokit.IOAHCIBlockStorage 1.6.3
com.apple.driver.AppleFWOHCI 4.7.1
com.apple.driver.AppleAHCIPort 2.1.5
com.apple.driver.AppleUSBOHCI 4.1.5
com.apple.driver.AppleHPET 1.5
com.apple.BootCache 31
com.apple.AppleFSCompression.AppleFSCompressionTypeZlib 1.0.0d1
com.apple.driver.AppleSDXC 1.0.1
com.apple.iokit.AppleBCM5701Ethernet 2.3.9b6
com.apple.driver.AirPortBrcm43224 426.36.1
com.apple.driver.AppleUSBHub 4.1.7
com.apple.driver.AppleUSBEHCI 4.1.7
com.apple.driver.AppleEFINVRAM 1.4.0
com.apple.driver.AppleRTC 1.3.1
com.apple.driver.AppleACPIButtons 1.3.5
com.apple.driver.AppleSMBIOS 1.6
com.apple.driver.AppleACPIEC 1.3.5
com.apple.driver.AppleAPIC 1.4
com.apple.driver.AppleIntelCPUPowerManagementClient 105.13.0
com.apple.security.sandbox 1
com.apple.security.quarantine 0
com.apple.nke.applicationfirewall 2.1.11
com.apple.driver.AppleIntelCPUPowerManagement 105.13.0
com.apple.driver.AppleProfileReadCounterAction 17
com.apple.driver.DspFuncLib 1.9.9f12
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.iokit.IOSurface 74.2
com.apple.iokit.IOBluetoothSerialManager 2.3.8f7
com.apple.iokit.IOSerialFamily 10.0.3
com.apple.iokit.CHUDKernLib 365
com.apple.iokit.IOAudioFamily 1.8.0fc1
com.apple.kext.OSvKernDSPLib 1.3
com.apple.driver.AppleHDAController 1.9.9f12
com.apple.iokit.IOHDAFamily 1.9.9f12
com.apple.driver.AppleSMBusController 1.0.8d0
com.apple.iokit.AppleProfileFamily 41.4
com.apple.driver.AppleSMC 3.1.0d3
com.apple.driver.IOPlatformPluginFamily 4.5.0d5
com.apple.driver.AppleSMBusPCI 1.0.8d0
com.apple.iokit.IOFireWireIP 2.0.3
com.apple.nvidia.nv50hal 6.2.6
com.apple.NVDAResman 6.2.6
com.apple.iokit.IONDRVSupport 2.2
com.apple.iokit.IOGraphicsFamily 2.2
com.apple.driver.BroadcomUSBBluetoothHCIController 2.3.8f7
com.apple.driver.AppleUSBBluetoothHCIController 2.3.8f7
com.apple.iokit.IOBluetoothFamily 2.3.8f7
com.apple.iokit.IOUSBHIDDriver 4.1.5
com.apple.driver.AppleUSBComposite 3.9.0
com.apple.iokit.IOSCSIMultimediaCommandsDevice 2.6.5
com.apple.iokit.IOBDStorageFamily 1.6
com.apple.iokit.IODVDStorageFamily 1.6
com.apple.iokit.IOCDStorageFamily 1.6
com.apple.iokit.IOAHCISerialATAPI 1.2.5
com.apple.iokit.IOSCSIArchitectureModelFamily 2.6.5
com.apple.driver.XsanFilter 402.1
com.apple.iokit.IOFireWireFamily 4.2.6
com.apple.iokit.IOAHCIFamily 2.0.4
com.apple.iokit.IO80211Family 312
com.apple.iokit.IONetworkingFamily 1.9
com.apple.iokit.IOUSBUserClient 4.1.5
com.apple.iokit.IOUSBFamily 4.1.7
com.apple.driver.NVSMU 2.2.7
com.apple.driver.AppleEFIRuntime 1.4.0
com.apple.iokit.IOHIDFamily 1.6.5
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 1.6.2
com.apple.driver.AppleACPIPlatform 1.3.5
com.apple.iokit.IOPCIFamily 2.6
com.apple.iokit.IOACPIFamily 1.3.0
Model: Macmini4,1, BootROM MM41.0042.B00, 2 processors, Intel Core 2 Duo, 2.4 GHz, 4 GB, SMC 1.65f2
Graphics: NVIDIA GeForce 320M, NVIDIA GeForce 320M, PCI, 256 MB
Memory Module: global_name
AirPort: spairport_wireless_card_type_airport_extreme (0x14E4, 0x93), Broadcom BCM43xx 1.0 (5.10.131.36.1)
Bluetooth: Version 2.3.8f7, 2 service, 19 devices, 1 incoming serial ports
Network Service: Ethernet, Ethernet, en1
Serial ATA Device: Hitachi HTS545032B9SA02, 298.09 GB
Serial ATA Device: HL-DT-STDVDRW GA32N
USB Device: BRCM2070 Hub, 0x0a5c (Broadcom Corp.), 0x4500, 0x06600000
USB Device: Bluetooth USB Host Controller, 0x05ac (Apple Inc.), 0x8218, 0x06630000
USB Device: IR Receiver, 0x05ac (Apple Inc.), 0x8242, 0x06500000
USB Device: Hub, 0x0557 (ATEN International Co. Ltd.), 0x8021, 0x04400000
USB Device: USB NETVISTA FULL WIDTH KEYBOARD, 0x0461 (Primax Electronics), 0x4e04, 0x04410000