iMac 2017 Big sur 11.4 ( 20F71) keeps crashing

Hi P.Phillips,

I did the following steps:

— Erase the HD

— Re-joined the Fusion drive as you mentioned

— Restore files from Time Machine using the Migration Assistant

— Reinstall most of the software that I need from fresh installers

But I'm still getting a Kernel error. I've uploaded another EtreCheck for you to review if you don't mind?

I'll be *****d if it's a hardware issue, as this iMac (2017, iMac18,3) is only 3 1/2 years old. I'm wondering if its the Little Snitch (Version 5.2.2 (6209)) software causing the error as this was recently updated before the problems just started.?

I'm thinking of reformatting the HD again and installing a fresh OS one more time, but would appreciate any ideas people might have.

Regards

More of the crash report

System Crash Report, below.

panic(cpu 0 caller 0xffffff802018d8aa): "UPSB(iMac18,3): thunderbolt power on failed 0xffffffff\n"@/System/Volumes/Data/SWE/macOS/BuildRoots/e90674e518/Library/Caches/com.apple.xbs/Sources/IOPCIFamily/IOPCIFamily-428.120.4/IOPCIBridge.cpp:1433

Backtrace (CPU 0), Frame : Return Address

0xffffffa1744039e0 : 0xffffff801d68e0dd 

0xffffffa174403a30 : 0xffffff801d7d4f33 

0xffffffa174403a70 : 0xffffff801d7c552a 

0xffffffa174403ac0 : 0xffffff801d632a2f 

0xffffffa174403ae0 : 0xffffff801d68d8fd 

0xffffffa174403c00 : 0xffffff801d68dbf3 

0xffffffa174403c70 : 0xffffff801de9d81a 

0xffffffa174403ce0 : 0xffffff802018d8aa 

0xffffffa174403d00 : 0xffffff8020173521 

0xffffffa174403d60 : 0xffffff8020173a65 

0xffffffa174403d80 : 0xffffff8020171be2 

0xffffffa174403dd0 : 0xffffff802017c9f3 

0xffffffa174403df0 : 0xffffff801ddd3811 

0xffffffa174403e60 : 0xffffff801ddd35aa 

0xffffffa174403e80 : 0xffffff801d6d46c5 

0xffffffa174403ef0 : 0xffffff801d6d5634 

0xffffffa174403fa0 : 0xffffff801d63213e 

     Kernel Extensions in backtrace:

        com.apple.iokit.IOPCIFamily(2.9)[99A70889-A31C-3B25-8E88-ADD3F317E4E4]@0xffffff802016a000->0xffffff8020192fff

Process name corresponding to current thread: kernel_task

Mac OS version:

20F71

Kernel version:

Darwin Kernel Version 20.5.0: Sat May 8 05:10:33 PDT 2021; root:xnu-7195.121.3~9/RELEASE_X86_64

Kernel UUID: 52A1E876-863E-38E3-AC80-09BBAB13B752

KernelCache slide: 0x000000001d400000

KernelCache base: 0xffffff801d600000

Kernel slide:     0x000000001d410000

Kernel text base: 0xffffff801d610000

__HIB text base: 0xffffff801d500000

System model name: iMac18,3 (Mac-BE088AF8C5EB4FA2)

System shutdown begun: NO

Panic diags file available: YES (0x0)

Hibernation exit count: 0

System uptime in nanoseconds: 1703983235740

Last Sleep:          absolute          base_tsc         base_nano

 Uptime : 0x0000018cbd50c4eb

 Sleep  : 0x000001852364e27f 0x00000013742ca7df 0x0000000000000000

 Wake   : 0x000001853d751807 0x00000000bfd6027b 0x000001853c3f437e

last started kext at 1672160944487: >!UAudio  405.39 (addr 0xffffff7fb81a6000, size 315392)

last stopped kext at 231134826316: >!ABacklightExpert  1.1.0 (addr 0xffffff7fb6b77000, size 8192)

loaded kexts:

@filesystems.smbfs  3.6

AudioAUUC  1.70

X86PlatformShim  1.0.0

AGPM  122.1

!APlatformEnabler  2.7.0d0

@fileutil  20.036.15

@filesystems.autofs  3.0

!AUpstreamUserClient  3.6.8

@kext.AMDFramebuffer  4.0.5

@kext.AMDRadeonX4000  4.0.5

@kext.AMDRadeonServiceManager  4.0.5

!AGraphicsDevicePolicy  6.3.3

@AGDCPluginDisplayMetrics  6.3.3

pmtelemetry  1

!AHDA  283.15

|IOUserEthernet  1.0.1

usb.!UUserHCI  1

|IO!BSerialManager  8.0.5d7

|Broadcom!B20703USBTransport  8.0.5d7

!A!IKBLGraphics  16.0.4

@Dont_Steal_Mac_OS_X  7.0.0

!AHV  1

!ADiskImages2  1

eficheck  1

!A!IPCHPMC  2.0.1

!A!ISlowAdaptiveClocking  4.0.0

@kext.AMD9500!C  4.0.5

!AGFXHDA  100.1.433

!ASMCLMU  212

!AThunderboltIP  4.0.3

!A!IKBLGraphicsFramebuffer  16.0.4

!AMCCSControl  1.14

!ATopCaseHIDEventDriver  4050.1

!UTopCaseDriver  4050.1

|IO!BUSBDFU  8.0.5d7

!AFileSystemDriver  3.0.1

@filesystems.tmpfs  1

@filesystems.hfs.kext  556.100.11

@BootCache  40

@!AFSCompression.!AFSCompressionTypeZlib  1.0.0

@!AFSCompression.!AFSCompressionTypeDataless  1.0.0d1

@filesystems.apfs  1677.120.9

|!ABCM5701Ethernet  11.0.0

!ASDXC  1.9.0

AirPort.BrcmNIC  1400.1.1

!AAHCIPort  346.100.2

@private.KextAudit  1.0

!AACPIButtons  6.1

!ARTC  2.0

!ASMBIOS  2.1

!AACPIEC  6.1

!AAPIC  1.7

@!ASystemPolicy  2.0.0

@nke.applicationfirewall  311

|IOKitRegistryCompatibility  1

|EndpointSecurity  1

!UAudio  405.39

@kext.triggers  1.0

@kext.AMDRadeonX4200HWLibs  1.0

@kext.AMDRadeonX4000HWServices  4.0.5

!AGraphicsControl  6.3.3

DspFuncLib  283.15

@kext.OSvKernDSPLib  529

|IOSerial!F  11

|Broadcom!BHost!CUSBTransport  8.0.5d7

|IO!BHost!CUSBTransport  8.0.5d7

|IO!BHost!CTransport  8.0.5d7

|IOAVB!F  940.4

|IOEthernetAVB!C  1.1.0

@!AGPUWrangler  6.3.3

|IOSlowAdaptiveClocking!F  1.0.0

@kext.AMDSupport  4.0.5

!AHDA!C  283.15

|IOHDA!F  283.15

|IOAudio!F  300.6.1

@vecLib.kext  1.2.0

!ASMBusPCI  1.0.14d1

!AThunderboltDPOutAdapter  8.1.4

X86PlatformPlugin  1.0.0

IOPlatformPlugin!F  6.0.0d8

@plugin.IOgPTPPlugin  985.2

|IOAccelerator!F2  442.9

@!AGraphicsDeviceControl  6.3.3

|IONDRVSupport  585.1

|IOGraphics!F  585.1

!ASMBus!C  1.0.18d1

!AHS!BDriver  4050.1

IO!BHIDDriver  8.0.5d7

!AMultitouchDriver  4440.3

!AInputDeviceSupport  4400.35

!AHIDKeyboard  224

usb.IOUSBHostHIDDevice  1.2

usb.cdc  5.0.0

usb.networking  5.0.0

usb.!UHostCompositeDevice  1.2

!AThunderboltDPInAdapter  8.1.4

!AThunderboltDPAdapter!F  8.1.4

!AThunderboltPCIDownAdapter  4.1.1

!AHPM  3.4.4

!A!ILpssI2C!C  3.0.60

!A!ILpssDmac  3.0.60

!ABSDKextStarter  3

Final part of crash report

|IOSurface  290.8.1

@filesystems.hfs.encodings.kext  1

!AXsanScheme  3

|IOAHCIBlock!S  332

!AThunderboltNHI  7.2.8

|IOThunderbolt!F  9.3.2

|IO80211!F  1200.12.2b1

|IOSkywalk!F  1

mDNSOffloadUserClient  1.0.1b8

corecapture  1.0.4

|IONVMe!F  2.1.0

!A!ILpssI2C  3.0.60

usb.!UHostPacketFilter  1.0

|IOAHCI!F  294.100.1

!A!ILpssGspi  3.0.60

|IOUSB!F  900.4.2

usb.!UXHCIPCI  1.2

usb.!UXHCI  1.2

!AEFINVRAM  2.1

!AEFIRuntime  2.1

|IOSMBus!F  1.1

|IOHID!F  2.0.0

$!AImage4  3.0.0

|IOTimeSync!F  985.2

|IONetworking!F  3.4

DiskImages  493.0.0

|IO!B!F  8.0.5d7

|IOReport!F  47

|IO!BPacketLogger  8.0.5d7

$quarantine  4

$sandbox  300.0

@kext.!AMatch  1.0.0d1

|CoreAnalytics!F  1

!ASSE  1.0

!AKeyStore  2

!UTDM  511.120.2

|IOUSBMass!SDriver  184.121.1

|IOSCSIBlockCommandsDevice  436.121.1

|IO!S!F  2.1

|IOSCSIArchitectureModel!F  436.121.1

!AMobileFileIntegrity  1.0.5

@kext.CoreTrust  1

!AFDEKeyStore  28.30

!AEffaceable!S  1.0

!ACredentialManager  1.0

KernelRelayHost  1

|IOUSBHost!F  1.2

!UHostMergeProperties  1.2

usb.!UCommon  1.0

!ABusPower!C  1.0

!ASEPManager  1.0.1

IOSlaveProcessor  1

!AACPIPlatform  6.1

!ASMC  3.1.9

|IOPCI!F  2.9

|IOACPI!F  1.4

watchdog  1

@kec.pthread  1

@kec.corecrypto  11.1

@kec.Libm  1

The report added and I appreciate your help here!

Ok, thanks for advice, I was prepared to do a clean install. Unlcky i have a fairly recent time machine backup which i can restore files from. Any other wisdom to share before I wipe the machine?