Imac shuts down all by itself preceded by a msg on the screen telling me to power it off then on again. If this happens in the middle of the night it just powers off. It cannot be powered on again unless the power is switched off at the mains.

Question

Imac shuts down all by itself preceded by a msg on the screen telling me to power it off then on again. If this happens in the middle of the night it just powers off. It cannot be powered on again unless the power is switched off at the mains.

My screen goes from normal intensity to sort of grey / see-through colour from top to bottom then the above message is displayed. If I don't do anything then the whole iMac powers off after a certain timeout period. I cannot do anything about it except start it up again. This happens every couple of days or so, no special time period it seems. Could it be a virus or ???

iMac, Mac OS X (10.6.8)

Posted on Jun 16, 2015 10:50 PM

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Answer 1

Kappy

Level 10

361,741 points

Jun 16, 2015 10:54 PM in response to stephenfromgosford

That is a kernel panic: OS X- About kernel panics. Please post the most recent panic log: Mac OS X- How to log a kernel panic.

About "You need to restart your computer" (kernel panic) messages

Visit The XLab FAQs and read the FAQ on diagnosing kernel panics.

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Answer 2

Jun 16, 2015 11:06 PM in response to Kappy

This is the panic log I found for today (also happened yesterday)

Wed Jun 17 14:43:55 2015

panic(cpu 0 caller 0x235410): "zalloc: \"buf.8192\" (788 elements) retry fail 3, kfree_nop_count: 0"@/SourceCache/xnu/xnu-1504.15.3/osfmk/kern/zalloc.c:992

Backtrace (CPU 0), Frame : Return Address (4 potential args on stack)

0x5db33198 : 0x21b837 (0x5dd7fc 0x5db331cc 0x223ce1 0x0)

0x5db331e8 : 0x235410 (0x594ac8 0x5a1ee4 0x314 0x3)

0x5db33288 : 0x235a60 (0x2ec3d4c 0x1 0x0 0x5db332e4)

0x5db332a8 : 0x2cee5c (0x2ec3d4c 0x0 0x5db332d8 0x3)

0x5db332e8 : 0x2cfc00 (0x59789670 0x2000 0x5db33368 0x490daa)

0x5db33388 : 0x2cfe8d (0x979d4d0 0x1516f 0x0 0x2000)

0x5db333c8 : 0x2cff4a (0x2000 0x0 0x0 0x10)

0x5db333e8 : 0x419f76 (0x979d4d0 0x1516f 0x0 0x2000)

0x5db33458 : 0x450d0c (0x979d4d0 0x1516f 0x0 0x5db334bc)

0x5db33478 : 0x452c51 (0x97a7c04 0x1516f 0x0 0x5db334bc)

0x5db334f8 : 0x44f518 (0x97a7c04 0xa90d820 0x5db33524 0x5db335c4)

0x5db335e8 : 0x44cc11 (0x97b8f10 0xa90d804 0x5db3369c 0x5db336ae)

0x5db336c8 : 0x2fc357 (0x5db336e0 0x10c15 0x5db33778 0x448987)

0x5db33718 : 0x2f9500 (0x139c0250 0x5a45c4 0x0 0x5db337ac)

0x5db33768 : 0x2facc0 (0x139c0250 0x5a45c4 0x0 0x5db337ac)

0x5db337c8 : 0x2feafd (0x139c0250 0x5db33960 0x14da5554 0x2d16cd)

0x5db33818 : 0x2e4605 (0x139c0250 0x5db33960 0x14da5554 0x5db3383c)

0x5db33aa8 : 0x46dd05 (0x3561f68c 0x0 0x880 0x14da5554)

0x5db33ae8 : 0x2debb8 (0x7ef9c04 0x3561f68c 0x880 0x14da5554)

0x5db33b38 : 0x2ca32d (0x139c0250 0x0 0x880 0x14da5554)

0x5db33de8 : 0x2cbacc (0x14da5554 0x0 0x0 0x46fb8f)

0x5db33f78 : 0x4f82fb (0x8c04a80 0x9ff8e68 0x14da5494 0x1)

0x5db33fc8 : 0x2a251d (0x9ff8e64 0x0 0x10 0x9b48564)

BSD process name corresponding to current thread: backupd

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: iMac11,2 (Mac-F2238AC8)

System uptime in nanoseconds: 158442388126019

vm objects:13748460

vm object hash entri:1362720

non-kernel map entri:1865952

kernel map entries:5660644

pv_list:1692432

kalloc.16:38322176

kalloc.32:30609408

kalloc.64:192794624

kalloc.128:2363392

kalloc.256:1142784

kalloc.512:3694592

kalloc.8192:2154496

vm pages:44623700

ipc ports:724360896

vnodes:9857540

namecache:3443520

HFS node:14383380

HFS fork:6683824

cluster_write:3494920

buf.8192:6455296

ubc_info zone:2366400

vnode pager structur:1183200

Kernel Stacks:1392640

PageTables:27017216

Kalloc.Large:8755288

unloaded kexts:

(none)

loaded kexts:

com.smithmicro.nke.NetBlockade 4.0

com.apple.filesystems.udf 2.1.1 - last loaded 39063977037

com.apple.filesystems.msdosfs 1.6.3

com.apple.filesystems.autofs 2.1.0

com.apple.driver.AppleHWSensor 1.9.3d0

com.apple.driver.AppleMikeyHIDDriver 1.2.0

com.apple.driver.AppleUpstreamUserClient 3.5.7

com.apple.driver.AppleMCCSControl 1.0.20

com.apple.driver.AppleTyMCEDriver 1.0.2d2

com.apple.driver.AGPM 100.12.31

com.apple.driver.InternalModemSupport 2.6.2

com.apple.driver.AppleHDA 2.0.5f14

com.apple.kext.ATIFramebuffer 6.3.6

com.apple.driver.AppleMikeyDriver 2.0.5f14

com.apple.driver.AudioAUUC 1.57

com.apple.ATIRadeonX2000 6.3.6

com.apple.driver.AppleUSBOpticalMouse 3.7.5

com.apple.Dont_Steal_Mac_OS_X 7.0.0

com.apple.driver.AudioIPCDriver 1.1.6

com.apple.driver.AppleIntelYonahProfile 14

com.apple.driver.AppleIntelPenrynProfile 17

com.apple.driver.AirPort.Atheros21 425.14.7

com.apple.driver.AppleIntelNehalemProfile 11

com.apple.driver.AppleIntelMeromProfile 19

com.apple.driver.ACPI_SMC_PlatformPlugin 4.7.0a1

com.apple.driver.AppleLPC 1.5.1

com.apple.driver.AppleGraphicsControl 2.10.6

com.apple.driver.AppleBacklight 170.0.46

com.apple.driver.AppleIRController 303.8

com.apple.driver.AppleUSBCardReader 2.6.1

com.apple.iokit.SCSITaskUserClient 2.6.8

com.apple.BootCache 31.1

com.apple.AppleFSCompression.AppleFSCompressionTypeZlib 1.0.0d1

com.apple.iokit.IOAHCIBlockStorage 1.6.4

com.apple.driver.AppleFWOHCI 4.7.3

com.apple.driver.AppleUSBHub 4.2.4

com.apple.iokit.AppleBCM5701Ethernet 3.0.5b8

com.apple.driver.AppleEFINVRAM 1.4.0

com.apple.driver.AppleAHCIPort 2.1.7

com.apple.driver.AppleUSBEHCI 4.2.4

com.apple.driver.AppleUSBUHCI 4.2.0

com.apple.driver.AppleACPIButtons 1.3.6

com.apple.driver.AppleRTC 1.3.1

com.apple.driver.AppleHPET 1.5

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.AppleHDAHardwareConfigDriver 2.0.5f14

com.apple.driver.DspFuncLib 2.0.5f14

com.apple.driver.AppleProfileReadCounterAction 17

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.kext.ATI4600Controller 6.3.6

com.apple.kext.ATISupport 6.3.6

com.apple.iokit.IOFireWireIP 2.0.3

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.IO80211Family 320.1

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.driver.AppleBacklightExpert 1.0.1

com.apple.iokit.IONDRVSupport 2.2.1

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.iokit.IOUSBHIDDriver 4.2.0

com.apple.iokit.IOSCSIBlockCommandsDevice 2.6.8

com.apple.iokit.IOUSBMassStorageClass 2.6.7

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.AppleFileSystemDriver 2.0

com.apple.driver.XsanFilter 402.1

com.apple.iokit.IOAHCISerialATAPI 1.2.6

com.apple.iokit.IOSCSIArchitectureModelFamily 2.6.8

com.apple.iokit.IOFireWireFamily 4.2.6

com.apple.iokit.IOUSBUserClient 4.2.4

com.apple.iokit.IONetworkingFamily 1.10

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

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Answer 3

Kappy

Level 10

361,741 points

Jun 16, 2015 11:24 PM in response to stephenfromgosford

The panic is related to a Time Machine backup, but there isn't anything else related to that in the log. I did notice that you have a SmithMicro software installed. I suggest you uninstall any AV or Security software you have installed. Such software is not required for OS X. After you remove it and restart the computer see if you continue having kernel panics.

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Answer 4

Jun 16, 2015 11:40 PM in response to Kappy

Thanks for the tip Kappy, appreciated !

Oh, I checked the application list and don't see any Smith Micro. It doesn't ring any bells either i.e.

I wouldn't have installed it. How did you determine that from the panic log ?

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Answer 5

Eric Root

Level 10

684,033 points

Jun 17, 2015 7:57 AM in response to stephenfromgosford

Look for NetBlockade 4.0 and remove it as Kappy suggested.

Uninstall using the Developer's uninstall instructions.

Look at the top of the com.apple.xxxxx list. It appears there.

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