2019 iMac random rebooting

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I am a complete novice when it comes to Mac's and my girlfriend has a 2019 27" iMac that has worked just fine until recently. Over the last few weeks, it will sporadically restart, and then upon recovering it will display the below error message. I have tried the Apple recovery tool and no issues were found. Any help or direction would be much appreciated!

panic(cpu 2 caller 0xffffff7fb264c60f): "[IGPU] ERROR: SafeForceWake acknowledgement never received on GLOBAL domain, fFlags.systemInSleep: 0, fFlags.enabled: 1\n"@skl/IntelAccelerator.cpp:7918
Backtrace (CPU 2), Frame : Return Address
0xffffffb0a1c33440 : 0xffffff80128bab4d
0xffffffb0a1c33490 : 0xffffff80129fd7e3
0xffffffb0a1c334d0 : 0xffffff80129ede1a
0xffffffb0a1c33520 : 0xffffff801285fa2f
0xffffffb0a1c33540 : 0xffffff80128ba3ed
0xffffffb0a1c33660 : 0xffffff80128ba6d8
0xffffffb0a1c336d0 : 0xffffff80130bef9a
0xffffffb0a1c33740 : 0xffffff7fb264c60f
0xffffffb0a1c33770 : 0xffffff7fb25d7fb1
0xffffffb0a1c337c0 : 0xffffff7fb25d2c22
0xffffffb0a1c33800 : 0xffffff7fb25c4c45
0xffffffb0a1c33820 : 0xffffff7fb25c7722
0xffffffb0a1c338c0 : 0xffffff7fb25eb600
0xffffffb0a1c338f0 : 0xffffff7fb2617e14
0xffffffb0a1c33920 : 0xffffff7fb25eb45f
0xffffffb0a1c33940 : 0xffffff7fb2626e6d
0xffffffb0a1c339a0 : 0xffffff7fb2626960
0xffffffb0a1c339d0 : 0xffffff7fb25ead09
0xffffffb0a1c33a00 : 0xffffff7fb2f1205c
0xffffffb0a1c33a80 : 0xffffff8013048170
0xffffffb0a1c33ad0 : 0xffffff80130463e7
0xffffffb0a1c33b20 : 0xffffff801305045b
0xffffffb0a1c33c80 : 0xffffff80129a8e51
0xffffffb0a1c33d90 : 0xffffff80128c0147
0xffffffb0a1c33e00 : 0xffffff8012896905
0xffffffb0a1c33e60 : 0xffffff80128ae062
0xffffffb0a1c33ef0 : 0xffffff80129d1fc3
0xffffffb0a1c33fa0 : 0xffffff8012860216
Kernel Extensions in backtrace:
com.apple.iokit.IOAcceleratorFamily2(439.52)[7B467C8D-2528-3663-8024-B09E1DCED75A]@0xffffff7fb2f0b000->0xffffff7fb2f74fff
dependency: com.apple.driver.AppleMobileFileIntegrity(1.0.5)[2A454117-CDAA-301F-B609-BA396742C91A]@0xffffff8013e01000->0xffffff8013e15fff
dependency: com.apple.iokit.IOGraphicsFamily(585)[EF8876FC-C6D6-3D53-9915-762EF4F12870]@0xffffff7fb3063000->0xffffff7fb3091fff
dependency: com.apple.iokit.IOPCIFamily(2.9)[BF2C5E86-1E8F-3FD4-9874-7738178FA73B]@0xffffff801521f000->0xffffff8015246fff
dependency: com.apple.iokit.IOReportFamily(47)[D3C4FAA4-8F06-3C5C-AB36-4BE632CCE051]@0xffffff8015255000->0xffffff8015257fff
dependency: com.apple.iokit.IOSurface(289.3)[22DEF369-CE8F-3ACF-BD1E-4CE16AAB209A]@0xffffff8015366000->0xffffff8015381fff
com.apple.driver.AppleIntelKBLGraphics(16.0.1)[9F686C76-339E-3B4C-91F9-B9A742F8B1CB]@0xffffff7fb25c2000->0xffffff7fb2679fff
dependency: com.apple.iokit.IOAcceleratorFamily2(439.52)[7B467C8D-2528-3663-8024-B09E1DCED75A]@0xffffff7fb2f0b000->0xffffff7fb2f74fff
dependency: com.apple.iokit.IOGraphicsFamily(585)[EF8876FC-C6D6-3D53-9915-762EF4F12870]@0xffffff7fb3063000->0xffffff7fb3091fff
dependency: com.apple.iokit.IOPCIFamily(2.9)[BF2C5E86-1E8F-3FD4-9874-7738178FA73B]@0xffffff801521f000->0xffffff8015246fff
dependency: com.apple.iokit.IOSurface(289.3)[22DEF369-CE8F-3ACF-BD1E-4CE16AAB209A]@0xffffff8015366000->0xffffff8015381fff

Process name corresponding to current thread: VTDecoderXPCService

Mac OS version:
20D91

Kernel version:
Darwin Kernel Version 20.3.0: Thu Jan 21 00:07:06 PST 2021; root:xnu-7195.81.3~1/RELEASE_X86_64
Kernel UUID: C86236B2-4976-3542-80CA-74A6B8B4BA03
KernelCache slide: 0x0000000012600000
KernelCache base: 0xffffff8012800000
Kernel slide: 0x0000000012610000
Kernel text base: 0xffffff8012810000
__HIB text base: 0xffffff8012700000
System model name: iMac19,1 (Mac-AA95B1DDAB278B95)
System shutdown begun: NO
Panic diags file available: YES (0x0)
Hibernation exit count: 0

System uptime in nanoseconds: 71328020885579
Last Sleep: absolute base_tsc base_nano
Uptime : 0x000040df5958f26d
Sleep : 0x00003a212346b7af 0x00000000b4e20904 0x00003a145d5f1bbc
Wake : 0x00003a212927b1b7 0x00000000b4e964a6 0x00003a2126fb68b4
last started kext at 16375320831962: >usb.IOUSBHostHIDDevice 1.2 (addr 0xffffff80157a2000, size 40960)
last stopped kext at 445807386841: >!ASMCRTC 1.0 (addr 0xffffff8013eb1000, size 16384)
loaded kexts:
usb.!UUserHCI 1
!ATopCaseHIDEventDriver 4030.5
AudioAUUC 1.70
!APlatformEnabler 2.7.0d0
AGPM 119
X86PlatformShim 1.0.0
!AUpstreamUserClient 3.6.8

@filesystems.autofs 3.0
@kext.AMDFramebuffer 4.0.2
@fileutil 20.036.15
@kext.AMDRadeonX4000 4.0.2
@kext.AMDRadeonServiceManager 4.0.2
!AGraphicsDevicePolicy 6.2.2

@AGDCPluginDisplayMetrics 6.2.2
pmtelemetry 1
LuaHardwareAccess 1.0.16

|IOUserEthernet 1.0.1
|IO!BSerialManager 8.0.3d9
@kext.AMD9500!C 4.0.2
@Dont_Steal_Mac_OS_X 7.0.0
!AHV 1
!ADiskImages2 1
!A!ISlowAdaptiveClocking 4.0.0
!AHDA 283.15
!A!IKBLGraphics 16.0.1
!ASMCLMU 212
!AThunderboltIP 4.0.3
!A!ICFLGraphicsFramebuffer 16.0.1
!AGFXHDA 100.1.431
eficheck 1
!AMCCSControl 1.14
!A!IPCHPMC 2.0.1
BCMWLANFirmware4378.Hashstore 1
BCMWLANFirmware4377.Hashstore 1
BCMWLANFirmware4364.Hashstore 1
BCMWLANFirmware4355.Hashstore 1

@filesystems.tmpfs 1
@filesystems.hfs.kext 556.60.1
@BootCache 40
@!AFSCompression.!AFSCompressionTypeZlib 1.0.0
@!AFSCompression.!AFSCompressionTypeDataless 1.0.0d1
@filesystems.apfs 1677.81.1
!ASDXC 1.9.0

|!ABCM5701Ethernet 11.0.0
!ABCMWLANBusInterfacePCIeMac 1
!AAHCIPort 346

@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 310
|IOKitRegistryCompatibility 1
|EndpointSecurity 1
usb.IOUSBHostHIDDevice 1.2
usb.cdc.acm 5.0.0
usb.serial 6.0.0
usb.cdc.ecm 5.0.0
usb.cdc.ncm 5.0.0
!UMergeNub 900.4.2
!UAudio 401.4
usb.cdc 5.0.0
!AHIDKeyboard 223
!AMultitouchDriver 4400.28
!AInputDeviceSupport 4400.35
!AHS!BDriver 4030.5
IO!BHIDDriver 8.0.3d9

@kext.triggers 1.0
@kext.AMDRadeonX4400HWLibs 1.0
@kext.AMDRadeonX4000HWServices 4.0.2
!AGraphicsControl 6.2.2

|IOAVB!F 930.1
@kext.AMDSupport 4.0.2
@!AGPUWrangler 6.2.2
|IOSlowAdaptiveClocking!F 1.0.0
DspFuncLib 283.15

@kext.OSvKernDSPLib 529
|IO!BHost!CUARTTransport 8.0.3d9
|IO!BHost!CTransport 8.0.3d9
!ASMBusPCI 1.0.14d1

@plugin.IOgPTPPlugin 900.11
|IOEthernetAVB!C 1.1.0
!A!ILpssUARTv1 3.0.60
!A!ILpssUARTCommon 3.0.60
!AOnboardSerial 1.0

|IOAccelerator!F2 439.52
!AHDA!C 283.15

|IOHDA!F 283.15
|IOAudio!F 300.6.1
@vecLib.kext 1.2.0
X86PlatformPlugin 1.0.0

@!AGraphicsDeviceControl 6.2.2
|IONDRVSupport 585
|IOGraphics!F 585
!ASMBus!C 1.0.18d1
IOPlatformPlugin!F 6.0.0d8
usb.networking 5.0.0
usb.!UHostCompositeDevice 1.2
!AThunderboltPCIDownAdapter 4.1.1
!AThunderboltDPInAdapter 8.1.4
!AThunderboltDPAdapter!F 8.1.4
!AHPM 3.4.4
!A!ILpssI2C!C 3.0.60
!A!ILpssI2C 3.0.60
!A!ILpssDmac 3.0.60
!ABSDKextStarter 3

|IOSurface 289.3
@filesystems.hfs.encodings.kext 1
!AThunderboltNHI 7.2.8

|IOThunderbolt!F 9.3.2
!ABCMWLANCoreMac 1.0.0

|IOSerial!F 11
|IO80211!FV2 1200.12.2b1
|IOSkywalk!F 1
mDNSOffloadUserClient 1.0.1b8
IOImageLoader 1.0.0
corecapture 1.0.4

|IOAHCIBlock!S 332
|IONVMe!F 2.1.0
|IOAHCI!F 294
usb.!UXHCIPCI 1.2
usb.!UXHCI 1.2

|IOUSB!F 900.4.2
!AEFINVRAM 2.1
!AEFIRuntime 2.1

|IOSMBus!F 1.1
|IOHID!F 2.0.0
$!AImage4 3.0.0
|IOTimeSync!F 900.11
|IONetworking!F 3.4
DiskImages 493.0.0

|IO!B!F 8.0.3d9
|IOReport!F 47
|IO!BPacketLogger 8.0.3d9
$quarantine 4
$sandbox 300.0
@kext.!AMatch 1.0.0d1
|CoreAnalytics!F 1
!ASSE 1.0
!AKeyStore 2
!UTDM 511.60.2

|IOUSBMass!SDriver 184.40.6
|IOSCSIBlockCommandsDevice 436.40.6
|IO!S!F 2.1
|IOSCSIArchitectureModel!F 436.40.6
!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
 

Cory Cooper

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Hello and welcome.

That is an iMac (Retina 5K, 27-inch, 2019) running macOS 11.2.3 Big Sur, correct?

First thing I would try would be: Use Apple Diagnostics to test your Mac

The VTDecoderXPCService listed in the kernel panic log is related to playing video content. Does this happen when running Safari/Chrome/Firefox mainly?

C
 
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C
Hello and welcome.

That is an iMac (Retina 5K, 27-inch, 2019) running macOS 11.2.3 Big Sur, correct?

First thing I would try would be: Use Apple Diagnostics to test your Mac

The VTDecoderXPCService listed in the kernel panic log is related to playing video content. Does this happen when running Safari/Chrome/Firefox mainly?

C
Thank you! I ran the diagnostics and it came back displaying no issues. I apologize, yes it is running Big Sur and has the most recent updates. Chrome is used pretty much exclusively. On my PC, i would dig into making sure the drivers were all up to date, but it seems Mac has solved that with their OS updates. Most of what i have read is that it might be a bad video card, and I wanted to make sure i cover all my bases before I take it in and try to get a new one installed.

Thank you again!
 

Cory Cooper

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Joined
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Messages
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No worries.

If it happens a lot on Chrome, you could try disabling Chrome > Preferences > System > Use hardware acceleration when available. Also, try disabling/uninstalling and Chrome Extensions.

Yes, it could be the beginning of a hardware failure of the graphics chip/logic board. It could also be a thermal issue, if the vents are blocked by dust - check above the power cord slot on the back, behind the foot.

C
 

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