A Baffling Kernel Panic in macOS
The problem: it was taking a very long time for my Mac Mini M1 to shutdown. In fact, it wouldn’t shutdown, but rebooted after a long while. The stackshot is below.
I searched for “watchdog timeout: no checkins from watchdogd” and came across this: https://apple.stackexchange.com/questions/412584/m1-mac-kernel-panic-on-reboot-no-checkins-from-watchdogd
Indeed, my Terminal app was listed in the “Developer Tools” section of Security & Privacy settings in macOS. I removed it, and problem solved. Also, the existence of a “Developer Tools” section in the Security & Privacy settings was news to me.
panic(cpu 0 caller 0xfffffe0016745e30): watchdog timeout: no checkins from watchdogd in 305 seconds (511 totalcheckins since monitoring last enabled), shutdown in progress
Debugger message: panic
Memory ID: 0xff
OS release type: User
OS version: 20E241
Kernel version: Darwin Kernel Version 20.4.0: Thu Apr 22 21:46:41 PDT 2021; root:xnu-7195.101.2~1/RELEASE_ARM64_T8101
Fileset Kernelcache UUID: 0B829878C98BF0B6E3AF7BF571B60BF2
Kernel UUID: 1DC99FEF-0771-3229-974C-9B18710700AE
iBoot version: iBoot-6723.101.4
secure boot?: YES
Paniclog version: 13
KernelCache slide: 0x000000000bca4000
KernelCache base: 0xfffffe0012ca8000
Kernel slide: 0x000000000c7e4000
Kernel text base: 0xfffffe00137e8000
Kernel text exec base: 0xfffffe00138b0000
mach_absolute_time: 0x1e61d41f56
Epoch Time: sec usec
Boot : 0x60946d08 0x00015b56
Sleep : 0x00000000 0x00000000
Wake : 0x00000000 0x00000000
Calendar: 0x60948237 0x0002e29d
CORE 0 recently retired instr at 0xfffffe0013a20b18
CORE 1 recently retired instr at 0xfffffe0013a21fcc
CORE 2 recently retired instr at 0xfffffe0013a21fcc
CORE 3 recently retired instr at 0xfffffe0013a21fcc
CORE 4 recently retired instr at 0xfffffe0013a21fd0
CORE 5 recently retired instr at 0xfffffe0013a21fd0
CORE 6 recently retired instr at 0xfffffe0013a21fd0
CORE 7 recently retired instr at 0xfffffe0013a21fd0
Total cpu_usage: 13790411
Thread task pri cpu_usage
0xfffffe1666900660 kernel_task 0 6683008
0xfffffe1666d5e640 kernel_task 0 4159352
0xfffffe1666d5ccc0 kernel_task 0 0
0xfffffe1666c74660 kernel_task 0 19556
0xfffffe1666d5dfe0 kernel_task 0 0
Panicked task 0xfffffe1666834688: 35305 pages, 458 threads: pid 0: kernel_task
Panicked thread: 0xfffffe1666900660, backtrace: 0xfffffe30194578b0, tid: 102
lr: 0xfffffe00138fe920 fp: 0xfffffe3019457920
lr: 0xfffffe00138fe704 fp: 0xfffffe3019457990
lr: 0xfffffe0013a27330 fp: 0xfffffe30194579b0
lr: 0xfffffe0013a18b90 fp: 0xfffffe3019457a60
lr: 0xfffffe00138b77e8 fp: 0xfffffe3019457a70
lr: 0xfffffe00138fe394 fp: 0xfffffe3019457e00
lr: 0xfffffe00138fe394 fp: 0xfffffe3019457e70
lr: 0xfffffe00140ae96c fp: 0xfffffe3019457e90
lr: 0xfffffe0016745e30 fp: 0xfffffe3019457ec0
lr: 0xfffffe00167455c8 fp: 0xfffffe3019457f00
lr: 0xfffffe0014ca1668 fp: 0xfffffe3019457f20
lr: 0xfffffe0014a1a8c8 fp: 0xfffffe3019457fb0
lr: 0xfffffe0014003548 fp: 0xfffffe3019457fc0
lr: 0xfffffe0013a1b5b8 fp: 0xfffffe3019457fe0
lr: 0xfffffe00138b785c fp: 0xfffffe3019457ff0
lr: 0xfffffe00139297a4 fp: 0xfffffe3f630b3ee0
lr: 0xfffffe00139299b0 fp: 0xfffffe3f630b3f00
lr: 0xfffffe00138c0c38 fp: 0x0000000000000000
Kernel Extensions in backtrace:
com.apple.driver.AppleInterruptController(1.0d1)[1903B10D-E35E-3864-9842-4EE73CE97CD2]@0xfffffe0014a18000->0xfffffe0014a1bfff
dependency: com.apple.driver.AppleARMPlatform(1.0.2)[58B65D99-A7B7-316F-8E28-CEDEE98BBC3E]@0xfffffe001420c000->0xfffffe001425bfff
com.apple.driver.watchdog(1.0)[BEE7A0FC-B21D-32F4-8632-C669EA683887]@0xfffffe0016744000->0xfffffe0016747fff
com.apple.driver.AppleS5L8960XWatchDogTimer(1.0)[2B2069CC-0C2D-3A5A-B4FA-D10F4C2D8371]@0xfffffe0014ca0000->0xfffffe0014ca3fff
dependency: com.apple.driver.AppleARMPlatform(1.0.2)[58B65D99-A7B7-316F-8E28-CEDEE98BBC3E]@0xfffffe001420c000->0xfffffe001425bfff
dependency: com.apple.driver.watchdog(1)[BEE7A0FC-B21D-32F4-8632-C669EA683887]@0xfffffe0016744000->0xfffffe0016747fff
dependency: com.apple.iokit.IOReportFamily(47)[789544EB-168A-39BF-9FAB-1D8E60EDF2EE]@0xfffffe0015d18000->0xfffffe0015d1bfff
last started kext at 1049340046: com.apple.filesystems.autofs 3.0 (addr 0xfffffe0013760000, size 16384)
loaded kexts:
com.apple.filesystems.autofs 3.0
com.apple.fileutil 20.036.15
com.apple.driver.AppleTopCaseHIDEventDriver 4040.11
com.apple.iokit.IOBluetoothSerialManager 8.0.4d18
com.apple.driver.AppleBiometricServices 1
com.apple.driver.BCMWLANFirmware4378.Hashstore 1
com.apple.driver.AppleAOPVoiceTrigger 11.5
com.apple.iokit.AppleBCM5701Ethernet 11.0.0
com.apple.driver.AppleThunderboltIP 4.0.3
com.apple.driver.CoreKDL 1
com.apple.driver.SEPHibernation 1
com.apple.driver.AppleUSBDeviceNCM 5.0.0
com.apple.driver.DiskImages.ReadWriteDiskImage 493.0.0
com.apple.driver.DiskImages.UDIFDiskImage 493.0.0
com.apple.driver.DiskImages.RAMBackingStore 493.0.0
com.apple.driver.DiskImages.FileBackingStore 493.0.0
com.apple.driver.AppleSmartBatteryManager 161.0.0
com.apple.filesystems.apfs 1677.100.114
com.apple.driver.AppleFileSystemDriver 3.0.1
com.apple.nke.l2tp 1.9
com.apple.filesystems.tmpfs 1
com.apple.driver.AppleSmartIO2 1
com.apple.driver.ApplePMP 1
com.apple.IOTextEncryptionFamily 1.0.0
com.apple.filesystems.hfs.kext 556.100.11
com.apple.security.BootPolicy 1
com.apple.BootCache 40
com.apple.AppleFSCompression.AppleFSCompressionTypeZlib 1.0.0
com.apple.AppleFSCompression.AppleFSCompressionTypeDataless 1.0.0d1
com.apple.driver.ApplePMPFirmware 1
com.apple.AppleEmbeddedSimpleSPINORFlasher 1
com.apple.driver.AppleSPMIPMU 1.0.1
com.apple.driver.AppleCS42L83Audio 442.26
com.apple.driver.AppleTAS5770LAmp 442.26
com.apple.driver.AppleJPEGDriver 4.6.0
com.apple.driver.AppleMobileDispH13G-DCP 140.0
com.apple.driver.AppleAVD 380
com.apple.driver.AppleAVE2 401.73.2
com.apple.AGXG13G 173.22.1
com.apple.driver.usb.AppleUSBHostT8103 1
com.apple.driver.AudioDMAController-T8103 1.60.5
com.apple.driver.AppleT8020SOCTuner 1
com.apple.driver.AppleT8103CLPCv3 1
com.apple.driver.AppleSPIMC 1
com.apple.driver.AppleS5L8960XNCO 1
com.apple.driver.AppleT8103PMGR 1
com.apple.driver.AppleS8000AES 1
com.apple.driver.AppleS5L8920XPWM 1.0.0d1
com.apple.driver.AppleS8000DWI 1.0.0d1
com.apple.driver.AppleS5L8960XWatchDogTimer 1
com.apple.driver.AppleInterruptController 1.0.0d1
com.apple.driver.AppleBluetoothModule 1
com.apple.driver.AppleSamsungSerial 1.0.0d1
com.apple.driver.AppleBCMWLANBusInterfacePCIe 1
com.apple.driver.AppleMCDP29XXUpdateSupport 1
com.apple.driver.AppleT8020DART 1
com.apple.driver.AppleS5L8940XI2C 1.0.0d2
com.apple.driver.AppleT8101 1
com.apple.driver.AppleM68Buttons 1.0.0d1
com.apple.iokit.IOUserEthernet 1.0.1
com.apple.driver.usb.AppleUSBUserHCI 1
com.apple.iokit.IOKitRegistryCompatibility 1
com.apple.iokit.EndpointSecurity 1
com.apple.driver.AppleDiskImages2 1
com.apple.AppleSystemPolicy 2.0.0
com.apple.nke.applicationfirewall 311
com.apple.kec.InvalidateHmac 1
com.apple.kext.triggers 1.0
com.apple.driver.AppleActuatorDriver 4440.3
com.apple.driver.AppleMultitouchDriver 4440.3
com.apple.driver.AppleInputDeviceSupport 4400.35
com.apple.driver.AppleHSBluetoothDriver 4040.11
com.apple.driver.IOBluetoothHIDDriver 8.0.4d18
com.apple.iokit.IOAVBFamily 940.4
com.apple.plugin.IOgPTPPlugin 980.4
com.apple.iokit.IOEthernetAVBController 1.1.0
com.apple.driver.AppleMesaSEPDriver 100.99
com.apple.iokit.IOBiometricFamily 1
com.apple.driver.usb.IOUSBHostHIDDevice 1.2
com.apple.driver.usb.cdc 5.0.0
com.apple.driver.AppleUSBAudio 405.39
com.apple.iokit.IOAudioFamily 300.6.1
com.apple.vecLib.kext 1.2.0
com.apple.driver.AppleAOPAudio 16.2
com.apple.driver.IOBluetoothHostControllerPCIeTransport 8.0.4d18
com.apple.iokit.IOBluetoothHostControllerTransport 8.0.4d18
com.apple.driver.AppleConvergedIPCOLYBTControl 1
com.apple.driver.AppleConvergedPCI 1
com.apple.driver.AppleBluetoothDebug 1
com.apple.driver.usb.AppleEmbeddedUSBXHCIPCI 1
com.apple.driver.usb.AppleUSBXHCIPCI 1.2
com.apple.driver.AppleEmbeddedUSB 1
com.apple.driver.AppleTrustedAccessory 1
com.apple.driver.AppleSEPHDCPManager 1.0.1
com.apple.iokit.AppleSEPGenericTransfer 1
com.apple.driver.usb.networking 5.0.0
com.apple.driver.DiskImages.KernelBacked 493.0.0
com.apple.driver.AppleThunderboltDPInAdapter 8.1.4
com.apple.driver.AppleThunderboltDPAdapterFamily 8.1.4
com.apple.driver.AppleThunderboltUSBDownAdapter 1.0.4
com.apple.driver.AppleThunderboltPCIDownAdapter 4.1.1
com.apple.driver.AppleBTM 1.0.1
com.apple.driver.AppleXsanScheme 3
com.apple.driver.AppleDCPDPTXProxy 1.0.0
com.apple.driver.DCPDPFamilyProxy 1
com.apple.nke.ppp 1.9
com.apple.driver.AppleSPU 1
com.apple.driver.AppleBSDKextStarter 3
com.apple.filesystems.hfs.encodings.kext 1
com.apple.AGXFirmwareKextG13GRTBuddy 173.22.1
com.apple.AGXFirmwareKextRTBuddy64 173.22.1
com.apple.driver.AppleDiagnosticDataAccessReadOnly 1.0.0
com.apple.driver.AppleHPM 3.4.4
com.apple.iokit.IONVMeFamily 2.1.0
com.apple.driver.AppleNANDConfigAccess 1.0.0
com.apple.driver.AppleStockholmControl 1.0.0
com.apple.driver.AppleDialogPMU 1.0.1
com.apple.driver.AppleCSEmbeddedAudio 442.26
com.apple.driver.AppleEmbeddedAudio 442.26
com.apple.iokit.AppleARMIISAudio 80.34.1
com.apple.driver.DCPAVFamilyProxy 1
com.apple.driver.AppleH11ANEInterface 4.75.0
com.apple.driver.AppleMCA2-T8103 540.10
com.apple.iokit.IOMobileGraphicsFamily-DCP 343.0.0
com.apple.driver.AppleDCP 1
com.apple.driver.AppleFirmwareKit 1
com.apple.iokit.IOMobileGraphicsFamily 343.0.0
com.apple.iokit.IOGPUFamily 21.5
com.apple.driver.AppleSPMI 1.0.1
com.apple.driver.AppleT8103TypeCPhy 1
com.apple.driver.AppleUSBXDCIARM 1.0
com.apple.driver.AppleUSBXDCI 1.0
com.apple.iokit.IOUSBDeviceFamily 2.0.0
com.apple.driver.usb.AppleUSBXHCIARM 1
com.apple.driver.usb.AppleUSBXHCI 1.2
com.apple.driver.AppleEmbeddedUSBHost 1
com.apple.driver.usb.AppleUSBHub 1.2
com.apple.driver.usb.AppleUSBHostCompositeDevice 1.2
com.apple.driver.ApplePassthroughPPM 3.0
com.apple.driver.AppleSART 1
com.apple.driver.ApplePMGR 1
com.apple.driver.watchdog 1
com.apple.driver.usb.AppleUSBHostPacketFilter 1.0
com.apple.driver.AppleDisplayCrossbar 1.0.0
com.apple.driver.AppleTypeCPhy 1
com.apple.driver.AppleThunderboltNHI 7.2.8
com.apple.driver.AppleT8103PCIeC 1
com.apple.iokit.IOThunderboltFamily 9.3.2
com.apple.driver.ApplePIODMA 1
com.apple.driver.AppleT8103PCIe 1
com.apple.driver.AppleMultiFunctionManager 1
com.apple.driver.AppleEmbeddedPCIE 1
com.apple.driver.AppleBluetoothDebugService 1
com.apple.driver.AppleBCMWLANCore 1.0.0
com.apple.iokit.IO80211FamilyV2 1200.12.2b1
com.apple.driver.IOImageLoader 1.0.0
com.apple.driver.corecapture 1.0.4
com.apple.iokit.IODisplayPortFamily 1.0.0
com.apple.driver.AppleGPIOICController 1.0.2
com.apple.driver.AppleFireStormErrorHandler 1
com.apple.driver.AppleMobileApNonce 1
com.apple.iokit.IOTimeSyncFamily 980.4
com.apple.driver.DiskImages 493.0.0
com.apple.iokit.IOGraphicsFamily 585.1
com.apple.iokit.IOBluetoothFamily 8.0.4d18
com.apple.iokit.IOBluetoothPacketLogger 8.0.4d18
com.apple.driver.FairPlayIOKit 68.7.0
com.apple.iokit.CoreAnalyticsFamily 1
com.apple.driver.AppleSSE 1.0
com.apple.driver.AppleSEPKeyStore 2
com.apple.driver.AppleUSBTDM 511.101.1
com.apple.iokit.IOUSBMassStorageDriver 184.101.1
com.apple.iokit.IOPCIFamily 2.9
com.apple.iokit.IOSCSIBlockCommandsDevice 436.100.4
com.apple.iokit.IOSCSIArchitectureModelFamily 436.100.4
com.apple.driver.AppleIPAppender 1.0
com.apple.driver.AppleFDEKeyStore 28.30
com.apple.driver.AppleEffaceableStorage 1.0
com.apple.driver.AppleCredentialManager 1.0
com.apple.driver.KernelRelayHost 1
com.apple.iokit.IOUSBHostFamily 1.2
com.apple.driver.AppleUSBHostMergeProperties 1.2
com.apple.driver.usb.AppleUSBCommon 1.0
com.apple.driver.AppleSMC 3.1.9
com.apple.driver.RTBuddy 1.0.0
com.apple.driver.AppleEmbeddedTempSensor 1.0.0
com.apple.driver.AppleARMPMU 1.0
com.apple.iokit.IOAccessoryManager 1.0.0
com.apple.driver.AppleOnboardSerial 1.0
com.apple.iokit.IOSkywalkFamily 1
com.apple.driver.mDNSOffloadUserClient 1.0.1b8
com.apple.iokit.IONetworkingFamily 3.4
com.apple.iokit.IOSerialFamily 11
com.apple.driver.AppleSEPManager 1.0.1
com.apple.driver.AppleA7IOP 1.0.2
com.apple.driver.IOSlaveProcessor 1
com.apple.driver.AppleBiometricSensor 2
com.apple.iokit.IOHIDFamily 2.0.0
com.apple.AUC 1.0
com.apple.iokit.IOAVFamily 1.0.0
com.apple.iokit.IOHDCPFamily 1.0.0
com.apple.iokit.IOCECFamily 1
com.apple.iokit.IOAudio2Family 1.0
com.apple.driver.AppleEmbeddedAudioLibs 1.17
com.apple.driver.AppleFirmwareUpdateKext 1
com.apple.driver.AppleM2ScalerCSCDriver 265.0.0
com.apple.iokit.IOSurface 290.7
com.apple.driver.IODARTFamily 1
com.apple.security.quarantine 4
com.apple.security.sandbox 300.0
com.apple.kext.AppleMatch 1.0.0d1
com.apple.driver.AppleMobileFileIntegrity 1.0.5
com.apple.kext.CoreTrust 1
com.apple.security.AppleImage4 3.0.0
com.apple.iokit.IOCryptoAcceleratorFamily 1.0.1
com.apple.driver.AppleARMPlatform 1.0.2
com.apple.iokit.IOStorageFamily 2.1
com.apple.iokit.IOSlowAdaptiveClockingFamily 1.0.0
com.apple.iokit.IOReportFamily 47
com.apple.kec.pthread 1
com.apple.kec.corecrypto 11.1
com.apple.kec.Libm 1
** Stackshot Succeeded ** Bytes Traced 42744 (Uncompressed 149952) **