Same problem, each day crash, on iMac (Retina 5K, 27 pouces, fin 2015) on Big Sur 11.1 (20C69) : panic(cpu 2 caller 0xffffff800e56ea25): userspace watchdog timeout: no successful checkins from com.apple.logd in 120 seconds service returned not alive with context : unresponsive dispatch queue(s): com.apple.firehose.io-wl service: com.apple.logd, total successful checkins since load (103421 seconds ago): 10331, last successful checkin: 120 seconds ago service: com.apple.WindowServer, total successful checkins since load (103301 seconds ago): 10321, last successful checkin: 90 seconds ago Backtrace (CPU 2), Frame : Return Address 0xffffffb0b4b53670 : 0xffffff800b2b9aed 0xffffffb0b4b536c0 : 0xffffff800b3fc6e3 0xffffffb0b4b53700 : 0xffffff800b3ecd1a 0xffffffb0b4b53750 : 0xffffff800b25ea2f 0xffffffb0b4b53770 : 0xffffff800b2b938d 0xffffffb0b4b53890 : 0xffffff800b2b9678 0xffffffb0b4b53900 : 0xffffff800****434 0xffffffb0b4b53970 : 0xffffff800e56ea25 0xffffffb0b4b53980 : 0xffffff800e56e678 0xffffffb0b4b539a0 : 0xffffff800ba4569e 0xffffffb0b4b539f0 : 0xffffff800e56dab4 0xffffffb0b4b53b20 : 0xffffff800ba4f86b 0xffffffb0b4b53c80 : 0xffffff800b3a7d81 0xffffffb0b4b53d90 : 0xffffff800b2bf0e7 0xffffffb0b4b53e00 : 0xffffff800b295905 0xffffffb0b4b53e60 : 0xffffff800b2ad012 0xffffffb0b4b53ef0 : 0xffffff800b3d0ec3 0xffffffb0b4b53fa0 : 0xffffff800b25f216 Kernel Extensions in backtrace: com.apple.driver.watchdog(1.0)[7AE04EA4-D026-39A0-B2D5-5C9E4EE72967]@0xffffff800e56d000->0xffffff800e56efff Process name corresponding to current thread: watchdogd Mac OS version: 20C69 Kernel version: Darwin Kernel Version 20.2.0: Wed Dec 2 20:39:59 PST 2020; root:xnu-7195.60.75~1/RELEASEX8664 Kernel UUID: 82E2050C-5936-3D24-AD3B-EC4EC5C09E11 KernelCache slide: 0x000000000b000000 KernelCache base: 0xffffff800b200000 Kernel slide: 0x000000000b010000 Kernel text base: 0xffffff800b210000 _HIB text base: 0xffffff800b100000 System model name: iMac17,1 (Mac-B809C3757DA9BB8D) System shutdown begun: NO Panic diags file available: YES (0x0) Hibernation exit count: 0 System uptime in nanoseconds: 103447162405293 Last Sleep: absolute basetsc basenano Uptime : 0x00005e15ab5e4455 Sleep : 0x0000000000000000 0x0000000000000000 0x0000000000000000 Wake : 0x0000000000000000 0x0000000c8a986a17 0x0000000000000000 last started kext at 80803992767372: >Core!SFsck 554 (addr 0xffffff800cb67000, size 86016) last stopped kext at 103147296967353: >usb.!UHostPacketFilter 1.0 (addr 0xffffff800e05b000, size 8192) loaded kexts: com.Cycling74.driver.Soundflower 2 com.AmbrosiaSW.AudioSupport 4.1.4 @filesystems.afpfs 11.3 @nke.asptcp 8.2 @filesystems.exfat 1.4 AGPM 119!APlatformEnabler 2.7.0d0X86PlatformShim 1.0.0 @filesystems.smbfs 3.4.1OxfordSemi 511.60.2 @filesystems.autofs 3.0!AUpstreamUserClient 3.6.8 @kext.AMDFramebuffer 4.0.2 @fileutil 20.036.15 @kext.AMDRadeonServiceManager 4.0.2AudioAUUC 1.70!AMikeyHIDDriver 131 @kext.AMDRadeonX4000 4.0.2!AGraphicsDevicePolicy 6.2.2 @AGDCPluginDisplayMetrics 6.2.2pmtelemetry 1LuaHardwareAccess 1.0.16 |IOUserEthernet 1.0.1!AHDA 283.15!AMikeyDriver 283.15 |IO!BSerialManager 8.0.2f9!A!IPCHPMC 2.0.1 @DontStealMacOS_X 7.0.0!AHV 1!ADiskImages2 1!A!ISKLGraphics 16.0.1!A!ISlowAdaptiveClocking 4.0.0 |Broadcom!B20703USBTransport 8.0.2f9!ASMCLMU 212eficheck 1!AMCCSControl 1.14!AThunderboltIP 4.0.3 @kext.AMD9000!C 4.0.2!AFWOHCI 5.7.4!A!ISKLGraphicsFramebuffer 16.0.1 @filesystems.tmpfs 1 @filesystems.hfs.kext 556.60.1 @BootCache 40 @!AFSCompression.!AFSCompressionTypeZlib 1.0.0 @!AFSCompression.!AFSCompressionTypeDataless 1.0.0d1 @filesystems.apfs 1677.60.23 |!ABCM5701Ethernet 11.0.0!ASDXC 1.9.0AirPort.BrcmNIC 1400.1.1!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 1Core!S 554 $SecureRemotePassword 1.0 |IOFireWireSerialBusProtocolTransport 2.5.1 |IOFireWireSBP2 4.4.2!AHIDKeyboard 222 @kext.triggers 1.0 @kext.AMDRadeonX4070HWLibs 1.0 @kext.AMDRadeonX4000HWServices 4.0.2!AGraphicsControl 6.2.2DspFuncLib 283.15 @kext.OSvKernDSPLib 529 |IOSerial!F 11 @!AGPUWrangler 6.2.2 |IOSlowAdaptiveClocking!F 1.0.0 |Broadcom!BHost!CUSBTransport 8.0.2f9 |IO!BHost!CUSBTransport 8.0.2f9 |IO!BHost!CTransport 8.0.2f9!AHDA!C 283.15 |IOHDA!F 283.15X86PlatformPlugin 1.0.0IOPlatformPlugin!F 6.0.0d8 |IOAVB!F 900.12 @plugin.IOgPTPPlugin 900.11 |IOEthernetAVB!C 1.1.0 |IONDRVSupport 585!ASMBusPCI 1.0.14d1!ASMBus!C 1.0.18d1!AThunderboltEDMSink 5.0.3 @kext.AMDSupport 4.0.2 @plugin.IOAVBDiscoveryPlugin 900.12 |IOAudio!F 300.6.1 @vecLib.kext 1.2.0 |IOFireWire!F 4.8.3 |IOAccelerator!F2 439.52 @!AGraphicsDeviceControl 6.2.2 |IOGraphics!F 585usb.networking 5.0.0usb.!UHostCompositeDevice 1.2usb.!UHub 1.2!AThunderboltDPInAdapter 8.1.4!AThunderboltPCIUpAdapter 4.1.1!AThunderboltDPOutAdapter 8.1.4!AThunderboltDPAdapter!F 8.1.4!AThunderboltPCIDownAdapter 4.1.1!ABSDKextStarter 3 |IOSurface 289.3 @filesystems.hfs.encodings.kext 1!AThunderboltNHI 7.2.8 |IOThunderbolt!F 9.3.2 |IOAHCIBlock!S 332 |IO80211!F 1200.12.2b1 |IOSkywalk!F 1mDNSOffloadUserClient 1.0.1b8corecapture 1.0.4 |IOAHCI!F 294usb.!UXHCIPCI 1.2usb.!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 3.4DiskImages 493.0.0 |IO!B!F 8.0.2f9 |IOReport!F 47 |IO!BPacketLogger 8.0.2f9 $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 1.0KernelRelayHost 1 |IOUSBHost!F 1.2!UHostMergeProperties 1.2usb.!UCommon 1.0!ABusPower!C 1.0!ASEPManager 1.0.1IOSlaveProcessor 1!AACPIPlatform 6.1!ASMC 3.1.9 |IOPCI!F 2.9 |IOACPI!F 1.4watchdog 1 @kec.pthread 1 @kec.corecrypto 11.1 @kec.Libm 1