I get crashes like this every morning since I updated to Big Sur, any time that I’m not at my machine and actively using it for a few hours (or less). Happens regardless of whether I have no apps open at all, lots of apps open, active tasks running / processing data, or even while actively listening to music on my ps4 from mac’s media server. Note that I upgraded my system from High Sierra to Big Sur a few weeks ago, and had anticipated issues... but OS back to back crashing & rebooting all by itself whenever left unattended is quite the headache. A reboot may re-open all your apps and windows, but CPU intensive tasks/jobs are aborted and have to be restarted all over again -- days of progress lost at times; I migrated to Apple from PC's over 25 years ago because I needed a stable system... Crash report after reboot: panic(cpu 2 caller 0xffffff800ddfea25): userspace watchdog timeout: no successful checkins from com.apple.WindowServer in 120 seconds service: com.apple.logd, total successful checkins since load (51320 seconds ago): 5133, last successful checkin: 0 seconds ago service: com.apple.WindowServer, total successful checkins since load (51290 seconds ago): 5117, last successful checkin: 120 seconds ago Backtrace (CPU 2), Frame : Return Address 0xffffffa1b0bcb670 : 0xffffff800aa8cfdd 0xffffffa1b0bcb6c0 : 0xffffff800abd3fd3 0xffffffa1b0bcb700 : 0xffffff800abc45ca 0xffffffa1b0bcb750 : 0xffffff800aa31a2f 0xffffffa1b0bcb770 : 0xffffff800aa8c7fd 0xffffffa1b0bcb890 : 0xffffff800aa8caf3 0xffffffa1b0bcb900 : 0xffffff800b29ce34 0xffffffa1b0bcb970 : 0xffffff800ddfea25 0xffffffa1b0bcb980 : 0xffffff800ddfe660 0xffffffa1b0bcb9a0 : 0xffffff800b21d67e 0xffffffa1b0bcb9f0 : 0xffffff800ddfda34 0xffffffa1b0bcbb20 : 0xffffff800b22792b 0xffffffa1b0bcbc80 : 0xffffff800ab7f7d1 0xffffffa1b0bcbd90 : 0xffffff800aa9265d 0xffffffa1b0bcbe00 : 0xffffff800aa68cd5 0xffffffa1b0bcbe60 : 0xffffff800aa801e2 0xffffffa1b0bcbef0 : 0xffffff800aba869d 0xffffffa1b0bcbfa0 : 0xffffff800aa32216 Kernel Extensions in backtrace: com.apple.driver.watchdog(1.0)[4CFADD2A-613E-320D-AD14-9C9379E87CB7]@0xffffff800ddfc000->0xffffff800ddfefff Process name corresponding to current thread: watchdogd Mac OS version: 20G165 Kernel version: Darwin Kernel Version 20.6.0: Mon Aug 30 06:12:21 PDT 2021; root:xnu-7195.141.6~3/RELEASE_X86_64 Kernel UUID: C2591F4E-EE82-33CC-8C59-DB81D9AD80DD KernelCache slide: 0x000000000a800000 KernelCache base: 0xffffff800aa00000 Kernel slide: 0x000000000a810000 Kernel text base: 0xffffff800aa10000 __HIB text base: 0xffffff800a900000 System model name: MacPro6,1 (Mac-F60DEB81FF30ACF6) System shutdown begun: NO Panic diags file available: YES (0x0) Hibernation exit count: 0 System uptime in nanoseconds: 51353920517105 Last Sleep: absolute base_tsc base_nano Uptime : 0x00002eb4c430bfe5 Sleep : 0x0000000000000000 0x0000000000000000 0x0000000000000000 Wake : 0x0000000000000000 0x0000000ce2d1888f 0x0000000000000000 last started kext at 124826600974: @filesystems.exfat 1.4 (addr 0xffffff7fa6299000, size 53248) last stopped kext at 426920050127: >!AThunderboltEDMSink 5.0.3 (addr 0xffffff7fa5555000, size 32768) loaded kexts: @filesystems.exfat 1.4 @filesystems.smbfs 3.6.1 @filesystems.autofs 3.0 @fileutil 20.036.15 >!ATopCaseHIDEventDriver 4050.1 >!A!BMultitouch 99 @fsplaceholder 1.14.0 |IO!BSerialManager 8.0.5d7 >AudioAUUC 1.70 >!AUpstreamUserClient 3.6.8 >!AMCCSControl 1.14 >X86PlatformShim 1.0.0 >AGPM 122.1 >!APlatformEnabler 2.7.0d0 @kext.AMDFramebuffer 4.0.6 @kext.AMDRadeonX4000 4.0.6 @kext.AMDRadeonServiceManager 4.0.6 >!AGraphicsDevicePolicy 6.3.5 @AGDCPluginDisplayMetrics 6.3.5 >pmtelemetry 1 |IOUserEthernet 1.0.1 >!AHDA 283.15 >usb.!UUserHCI 1 @Dont_Steal_Mac_OS_X 7.0.0 >!AHV 1 >!ADiskImages2 1 >!A!ISlowAdaptiveClocking 4.0.0 >eficheck 1 >!ALPC 3.1 >!AThunderboltIP 4.0.3 @kext.AMD7000!C 4.0.6 >!A!IMCEReporter 115 >!AMGPUPowerControl 6.3.5 |IO!BUSBDFU 8.0.5d7 |SCSITaskUserClient 436.140.1 >!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 1677.141.2 >AirPort.BrcmNIC 1400.1.1 >!AAHCIPort 346.100.2 |!ABCM5701Ethernet 11.0.0 @private.KextAudit 1.0 >!AACPIButtons 6.1 >!AACPIEC 6.1 >!ARTC 2.0 >!AHPET 1.8 >!ASMBIOS 2.1 >!AAPIC 1.7 >!A!ICPUPowerManagementClient 222.0.0 @!ASystemPolicy 2.0.0 @nke.applicationfirewall 311 |IOKitRegistryCompatibility 1 |EndpointSecurity 1 >!A!ICPUPowerManagement 222.0.0 @kext.triggers 1.0 >!AHIDKeyboard 224 >!AHS!BDriver 4050.1 >IO!BHIDDriver 8.0.5d7 >!AMultitouchDriver 4440.3 >!AInputDeviceSupport 4400.35 |IOSerial!F 11 >!ASMBus!C 1.0.18d1 @kext.AMDRadeonX4030HWLibs 1.0 |IOAccelerator!F2 442.9 @kext.AMDRadeonX4000HWServices 4.0.6 >DspFuncLib 283.15 @kext.OSvKernDSPLib 529 |IOAVB!F 940.4 |IOEthernetAVB!C 1.1.0 @!AGPUWrangler 6.3.5 |IOSlowAdaptiveClocking!F 1.0.0 @plugin.IOgPTPPlugin 985.2 >X86PlatformPlugin 1.0.0 >IOPlatformPlugin!F 6.0.0d8 >!UMergeNub 900.4.2 >!UAudio 405.39 @kext.AMDSupport 4.0.6 @!AGraphicsDeviceControl 6.3.5 >!AThunderboltDPOutAdapter 8.1.4 >!AHDA!C 283.15 |IOHDA!F 283.15 |IOAudio!F 300.6.1 @vecLib.kext 1.2.0 >!AGraphicsControl 6.3.5 >!ABacklightExpert 1.1.0 |IONDRVSupport 585.1 |IOGraphics!F 585.1 |Broadcom!BHost!CUSBTransport 8.0.5d7 |IO!BHost!CUSBTransport 8.0.5d7 |IO!BHost!CTransport 8.0.5d7 >usb.IOUSBHostHIDDevice 1.2 >usb.!UHub 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 >!ABSDKextStarter 3 |IOSurface 290.8.1 @filesystems.hfs.encodings.kext 1 >!AXsanScheme 3 |IOAHCIBlock!S 332 >!AThunderboltNHI 7.2.8 |IOThunderbolt!F 9.3.2 >usb.!UHostPacketFilter 1.0 >usb.!UXHCIPCI 1.2 >usb.!UXHCI 1.2 |IO80211!F 1200.12.2b1 |IOSkywalk!F 1 >corecapture 1.0.4 |IOUSB!F 900.4.2 |IOAHCI!F 294.100.1 >mDNSOffloadUserClient 1.0.1b8 >usb.!UEHCIPCI 1.2 >usb.!UEHCI 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 511.141.1 |IOUSBMass!SDriver 184.140.2 |IOSCSIBlockCommandsDevice 436.140.1 |IO!S!F 2.1 |IOSCSIArchitectureModel!F 436.140.1 >!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