Imac crashes every time i run a scan

[hippyhillary]

twice now I have run a scan and walked away from the PC to come back finding that it had crashed.
Both times, I ran a full system scan and use the PC for some time while the scan was running.  Both times, when I rebooted, there was no log in avast for the scan I was running. 

The first time I started the scan at 1:16 am and went to bed about an hour later with it still scanning.  When I woke up, the screen saver was frozen and the clock was frozen on 3:48 am.  I had to reboot. Since this would have been significantly after the screensaver kicked in, I thought the crash might have happened if the mac tried to put the hard drive to sleep or something (although it shouldn't have if avast was still running a scan) so I turned off that setting and ran another scan.

The second scan, I started around 10:30 and left the PC around 10:45.  When I got home at 1:40, there was a screen saying that I needed to reboot my machine.  I did so.  After I rebooted, it popped up the "you shut your computer down because of a problem" dialog.  I opened details and got this:

Interval Since Last Panic Report:  16518907 sec
Panics Since Last Report:          1
Anonymous UUID:                    18BEE966-681C-4638-9D4D-E081C072748B

Sun Jul  3 13:22:14 2011
panic(cpu 0 caller 0x4ff954): "A kext releasing a(n) AppleAHCIDiskDriver has corrupted the registry."@/SourceCache/xnu/xnu-1504.9.17/libkern/c++/OSObject.cpp:244
Backtrace (CPU 0), Frame : Return Address (4 potential args on stack)
0xf23ed8 : 0x21b50c (0x5d42fc 0xf23f0c 0x223974 0x0)
0xf23f28 : 0x4ff954 (0x5d5830 0x58159c0 0x5a00a04 0x5a00900)
0xf23f68 : 0x4ff5ae (0x5a00a00 0x0 0x1 0xe00002c0)
0xf23f88 : 0x4ff5c9 (0x5a00a00 0x0 0x0 0x5a00900)
0xf23fa8 : 0x15ca10b (0x5a00a00 0x59fa2f4 0x2a147f 0x2278c7)
0xf23fc8 : 0x2a06cc (0x5a00900 0x0 0x10 0x635f284)
      Kernel Extensions in backtrace (with dependencies):
         com.apple.iokit.IOAHCIBlockStorage(1.6.3)@0x15c7000->0x15d9fff
            dependency: com.apple.iokit.IOAHCIFamily(2.0.4)@0x1131000
            dependency: com.apple.iokit.IOStorageFamily(1.6.2)@0x11c5000

BSD process name corresponding to current thread: kernel_task

Mac OS version:
10H574

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: iMac8,1 (Mac-F227BEC8)

System uptime in nanoseconds: 8544437639963
unloaded kexts:
com.apple.driver.AirPortBrcm43xx   423.91.27 (addr 0xed6000, size 0x1900544) - last unloaded 91096824983
loaded kexts:
com.avast.AvastFileShield   1.0.0d1
com.apple.driver.AppleHWSensor   1.9.3d0 - last loaded 27686364519
com.apple.filesystems.ntfs   3.3
com.apple.filesystems.autofs   2.1.0
com.apple.driver.AudioAUUC   1.13
com.apple.driver.AppleHDA   1.9.9f12
com.apple.driver.AppleUpstreamUserClient   3.4.5
com.apple.driver.AppleMCCSControl   1.0.17
com.apple.driver.AppleBacklight   170.0.34
com.apple.driver.AppleLPC   1.4.12
com.apple.GeForce   6.2.4
com.apple.Dont_Steal_Mac_OS_X   7.0.0
com.apple.driver.AudioIPCDriver   1.1.6
com.apple.driver.AppleIntelPenrynProfile   17
com.apple.driver.ACPI_SMC_PlatformPlugin   4.5.0d5
com.apple.driver.AppleIRController   303.8
com.apple.iokit.SCSITaskUserClient   2.6.5
com.apple.BootCache   31
com.apple.AppleFSCompression.AppleFSCompressionTypeZlib   1.0.0d1
com.apple.iokit.IOAHCIBlockStorage   1.6.3
com.apple.driver.AppleUSBHub   4.1.7
com.apple.iokit.AppleYukon2   3.2.1b1
com.apple.driver.AirPortBrcm43224   426.36.1
com.apple.driver.AppleFWOHCI   4.7.1
com.apple.driver.AppleAHCIPort   2.1.5
com.apple.driver.AppleIntelPIIXATA   2.5.1
com.apple.driver.AppleUSBEHCI   4.1.7
com.apple.driver.AppleUSBUHCI   4.1.5
com.apple.driver.AppleHPET   1.5
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.nvidia.nv50hal   6.2.4
com.apple.NVDAResman   6.2.4
com.apple.iokit.IONDRVSupport   2.2
com.apple.driver.AppleHDAController   1.9.9f12
com.apple.iokit.IOHDAFamily   1.9.9f12
com.apple.iokit.IOSurface   74.2
com.apple.iokit.IOGraphicsFamily   2.2
com.apple.iokit.IOBluetoothSerialManager   2.3.8f7
com.apple.iokit.IOSerialFamily   10.0.3
com.apple.iokit.IOAudioFamily   1.7.9fc4
com.apple.kext.OSvKernDSPLib   1.3
com.apple.iokit.AppleProfileFamily   41
com.apple.driver.IOPlatformPluginFamily   4.5.0d5
com.apple.iokit.IOFireWireIP   2.0.3
com.apple.driver.AppleSMC   3.1.0d3
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.AppleUSBMergeNub   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.driver.XsanFilter   402.1
com.apple.iokit.IOATAPIProtocolTransport   2.5.1
com.apple.iokit.IOSCSIArchitectureModelFamily   2.6.5
com.apple.iokit.IOUSBUserClient   4.1.5
com.apple.iokit.IO80211Family   312
com.apple.iokit.IONetworkingFamily   1.9
com.apple.iokit.IOFireWireFamily   4.2.6
com.apple.iokit.IOAHCIFamily   2.0.4
com.apple.iokit.IOATAFamily   2.5.1
com.apple.iokit.IOUSBFamily   4.1.7
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: iMac8,1, BootROM IM81.00C1.B00, 2 processors, Intel Core 2 Duo, 2.8 GHz, 2 GB, SMC 1.30f1
Graphics: NVIDIA GeForce 8800 GS, NVIDIA GeForce 8800 GS, PCIe, 512 MB
Memory Module: global_name
AirPort: spairport_wireless_card_type_airport_extreme (0x14E4, 0x8C), 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, en0
Serial ATA Device: WDC WD3200AAJS-40VWA1, 298.09 GB
Parallel ATA Device: MATSHITADVD-R   UJ-875, 7.42 GB
USB Device: Built-in iSight, 0x05ac  (Apple Inc.), 0x8502, 0xfd400000
USB Device: IR Receiver, 0x05ac  (Apple Inc.), 0x8242, 0x5d100000
USB Device: Comfort Curve Keyboard 2000, 0x045e  (Microsoft Corporation), 0x00dd, 0x1a200000
USB Device: BRCM2046 Hub, 0x0a5c  (Broadcom Corp.), 0x4500, 0x1a100000
USB Device: Bluetooth USB Host Controller, 0x05ac  (Apple Inc.), 0x820f, 0x1a110000
USB Device: USB-PS/2 Optical Mouse, 0x046d  (Logitech Inc.), 0xc01b, 0x3a200000

I have not had this type of issue before.  In fact, I think I have had one or two crashes in the entire 4 year life of the mac (other than these 2) and the system is almost always on.

System Specs:
I am running OSX version 10.6.5 on an iMac8,1 with an Intel Core 2 Duo 2.8 GHz processor.  I have one bootcamp/windows partition installed.

[mity]

Hi hippyhillary.

Thanks for the report. We are investigating the issue.

Regards,
mity

[mity]

hippyhillary,

we were so far unable to reproduce the crash. We will continue trying to do so, but in the mean time it would be very helpful if you could kindly follow instructions below. It could point us to the source of the issue:

(1) Disable Filesystem Shield:
 -- In the main GUI go to SHIELDS >> File System Shield, unlock the lock on the bottom of the window and move the slider to the OFF position).
 -- [OPTIONAL] Enter the following command in Terminal (note this step requires administrative rights):
    sudo kextunload  "/Library/Application Support/Avast/AvastFileShield.kext"
    (It would be better if you do this, but feel free to skip this if you really are not familiar with command line at all.)

Then run the Full System Scan and report if it keeps crashing.

(2) If still crashing, then please also disable sleep of the Mac in System Preferences and run the Full System Scan once again and report if still crashing.

Thanks
Mity

[mity]

It would be also helpful if you can provide the following log files:

/var/log/daemon.log
/var/log/fileshield.log
/var/log/kernel.log
/var/log/system.log

Note they can be quite big (the beta is logging quite a log), so consider compressing them before uploading. You can upload to ftp://ftp.avast.com (login as "anonymous", password is any e-mail address), go to "incoming" folder and upload there. (Please note that 'anonymous' cannot see what the folder contains but can upload anyway).