Reproduced in 11.3, 11.4, 11.5 beta 1 too. Not reproduced in 11.2.3 and early OS builds. Temporary Fix: Downgrade to 11.2.3 with full installer.

Downgrade to 11.2.3 is not workaround anymore: this OS has ZERO DAY vunerabilities (fixed in 11.4). WAIT PATCH FROM APPLE, MACOS CRASHES EVERY DAYS ON HUNDREDS COMPUTERS (MBP162019) IN MY COMPANY!!!

Not fixed in 11.4, 11.5 beta 1 !

Wait for macOS 12? :( Cant use external displays... Working with only the internal display is very disappointing. When you connect an external display, the operating system crashes.

When connect external display via Apple Multiport Adapter, it is not working. Install 11.2.3 – working... But ZERO DAY vunerability.

Same problem on macOS 11.5 beta 2 . Error report: FB9125674 panic(cpu 1 caller 0xffffff801d89e926): [kext.kalloc.2048]: element modified after free (off:1672, val:0xffffffff00000000, sz:2048, ptr:0xffffff93e2aa2000, prot:zero) 1672: 0xffffffff00000000 Backtrace (CPU 1), Frame : Return Address 0xffffffa1dc82abc0 : 0xffffff801d08d04d 0xffffffa1dc82ac10 : 0xffffff801d1d3f63 0xffffffa1dc82ac50 : 0xffffff801d1c455a 0xffffffa1dc82aca0 : 0xffffff801d031a2f 0xffffffa1dc82acc0 : 0xffffff801d08c86d 0xffffffa1dc82ade0 : 0xffffff801d08cb63 0xffffffa1dc82ae50 : 0xffffff801d89c8fa 0xffffffa1dc82aec0 : 0xffffff801d89e926 0xffffffa1dc82b340 : 0xffffff801d0eba86 0xffffffa1dc82b3b0 : 0xffffff801d09c65c 0xffffffa1dc82b400 : 0xffffff801d7ad562 0xffffffa1dc82b420 : 0xffffff802015d250 0xffffffa1dc82b440 : 0xffffff802016b3ec 0xffffffa1dc82b4a0 : 0xffffff802015d9a2 0xffffffa1dc82b540 : 0xffffff8020160d42 0xffffffa1dc82b7f0 : 0xffffff802015dea7 0xffffffa1dc82b950 : 0xffffff8020158325 0xffffffa1dc82bb50 : 0xffffff801d8855ba 0xffffffa1dc82bb90 : 0xffffff801d320b0f 0xffffffa1dc82bbd0 : 0xffffff801d346948 0xffffffa1dc82bc90 : 0xffffff801d32c628 0xffffffa1dc82bee0 : 0xffffff801d32d1d9 0xffffffa1dc82bf40 : 0xffffff801d73ed0e 0xffffffa1dc82bfa0 : 0xffffff801d0321f6 Kernel Extensions in backtrace: com.apple.security.sandbox(300.0)[A7366764-D41E-3A1F-9227-AE0ACB49A507]@0xffffff802014c000->0xffffff8020191fff dependency: com.apple.driver.AppleMobileFileIntegrity(1.0.5)[52E40A68-70FA-3782-9595-8D99527B837C]@0xffffff801e6c0000->0xffffff801e6d5fff dependency: com.apple.iokit.IOStorageFamily(2.1)[3DE94082-367D-3255-9BE7-7F5A87838247]@0xffffff801fc6f000->0xffffff801fc80fff dependency: com.apple.kext.AppleMatch(1.0.0d1)[87BEAD84-D39B-36F5-9703-26D5D48C188D]@0xffffff801e6bc000->0xffffff801e6befff Process name corresponding to current thread: mdworker_shared Boot args: chunklist-security-epoch=0 -chunklist-no-rev2-dev Mac OS version: 20G5033c Kernel version: Darwin Kernel Version 20.6.0: Mon May 24 00:50:08 PDT 2021; root:xnu-7195.140.22~21/RELEASE_X86_64 Kernel UUID: 331AAB1E-6B00-3159-B97F-4AD6FE3D7A31 KernelCache slide: 0x000000001ce00000 KernelCache base: 0xffffff801d000000 Kernel slide: 0x000000001ce10000 Kernel text base: 0xffffff801d010000 __HIB text base: 0xffffff801cf00000 System model name: MacBookPro16,1 (Mac-E1008331FDC96864) System shutdown begun: NO Hibernation exit count: 0 System uptime in nanoseconds: 972707514382 Last Sleep: absolute base_tsc base_nano Uptime : 0x000000e279e2cada Sleep : 0x000000c837ae17ab 0x000001ecbbcc7b4e 0x000000bb96ca5510 Wake : 0x000000c86a3fdd95 0x0000020edd6d08a6 0x000000c84964f113 last started kext at 939651192995: @filesystems.ntfs 3.14.3 (addr 0xffffff7fb88be000, size 401408) last stopped kext at 472063256470: >!ASMBusPCI 1.0.14d1 (addr 0xffffff7fb7b26000, size 4096) loaded kexts: @filesystems.ntfs 3.14.3 AudioAUUC 1.70 usb.realtek8153patcher 5.0.0 |SCSITaskUserClient 436.140.1 usb.!UHostBillboardDevice 1.0 AGPM 122.1 !APlatformEnabler 2.7.0d0 X86PlatformShim 1.0.0 @filesystems.autofs 3.0 @fileutil 20.036.15 !ATopCaseHIDEventDriver 4050.1 !AHIDALSService 1 @kext.AMDRadeonX6000 4.0.6 !AUpstreamUserClient 3.6.8 AGDCBacklightControl 6.3.4 @kext.AMDRadeonServiceManager 4.0.6 !ABridgeAudio!C 140.4 BridgeAudioCommunication 140.4 !A!IKBLGraphics 16.0.5 !AThunderboltIP 4.0.3 !AGFXHDA 100.1.433 !AAVEBridge 6.1 !AMCCSControl 1.14 !AGraphicsDevicePolicy 6.3.4 !AMuxControl2 6.3.4 @AGDCPluginDisplayMetrics 6.3.4 pmtelemetry 1 |IOUserEthernet 1.0.1 usb.!UUserHCI 1 |IO!BSerialManager 8.0.5d7 @Dont_Steal_Mac_OS_X 7.0.0 !AHV 1 !ADiskImages2 1 !A!ISlowAdaptiveClocking 4.0.0 !A!ICFLGraphicsFramebuffer 16.0.5 !A!IPCHPMC 2.0.1 BCMWLANFirmware4378.Hashstore 1 BCMWLANFirmware4377.Hashstore 1 BCMWLANFirmware4364.Hashstore 1 BCMWLANFirmware4355.Hashstore 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 !ABCMWLANBusInterfacePCIeMac 1 @filesystems.apfs 1677.140.1 @private.KextAudit 1.0 !ASmartBatteryManager 161.0.0 !AACPIButtons 6.1 !ASMBIOS 2.1 !AACPIEC 6.1 !AAPIC 1.7 @!ASystemPolicy 2.0.0 @nke.applicationfirewall 311 |IOKitRegistryCompatibility 1 |EndpointSecurity 1 usb.cdc.acm 5.0.0 usb.serial 6.0.0 driverkit.serial 6.0.0 !UAudio 405.39 usb.!UHub 1.2 @kext.triggers 1.0 !AHIDKeyboard 224 !AHS!BDriver 4050.1 IO!BHIDDriver 8.0.5d7 !AActuatorDriver 4440.3 !AMultitouchDriver 4440.3 !AInputDeviceSupport 4400.35 @kext.AMDRadeonX6100HWLibs 1.0 @kext.AMDRadeonX6000HWServices 4.0.6 !ABacklightExpert 1.1.0 @kext.AMDRadeonX6000Framebuffer 4.0.6 !AThunderboltDPOutAdapter 8.1.4 |IOAudio!F 300.6.1 @vecLib.kext 1.2.0 @kext.AMDSupport 4.0.6 !ASMBus!C 1.0.18d1 |IO!BHost!CUARTTransport 8.0.5d7 |IO!BHost!CTransport 8.0.5d7 !AGraphicsControl 6.3.4 !A!ILpssUARTv1 3.0.60 !A!ILpssUARTCommon 3.0.60 !AOnboardSerial 1.0 X86PlatformPlugin 1.0.0 |IONDRVSupport 585.1 |IOAVB!F 940.4 @plugin.IOgPTPPlugin 985.2 |IOEthernetAVB!C 1.1.0 @!AGPUWrangler 6.3.4 |IOSlowAdaptiveClocking!F 1.0.0 |IOAccelerator!F2 442.9 @!AGraphicsDeviceControl 6.3.4 |IOGraphics!F 585.1 IOPlatformPlugin!F 6.0.0d8 usb.IOUSBHostHIDDevice 1.2 usb.cdc.ncm 5.0.0 usb.cdc.ecm 5.0.0 usb.cdc 5.0.0 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 290.8.1 @filesystems.hfs.encodings.kext 1 !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 !AXsanScheme 3 usb.!UVHCIBCE 1.2 usb.!UVHCICommonBCE 1.0 usb.!UVHCI 1.2 usb.!UVHCICommon 1.0 !AEffaceableNOR 1.0 |IOBufferCopy!C 1.1.0 |IOBufferCopyEngine!F 1 |IONVMe!F 2.1.0 !AThunderboltNHI 7.2.8 |IOThunderbolt!F 9.3.2 usb.!UHostPacketFilter 1.0 |IOUSB!F 900.4.2 usb.!UXHCIPCI 1.2 usb.!UXHCI 1.2 !AEFINVRAM 2.1 !AEFIRuntime 2.1 !ASMCRTC 1.0 |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 511.140.1 |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

Reproduced in macOS 12 Monterey 🤦‍♂️

Crash fixed in macOS 12 Monterey beta 2 Little bugs: If I use multiport adapter – I see black screen only on external display (NEC 231WMi). On different external display multiport work ok. If I use non–apple dock and the laptop turns on from sleep mode I see black screen on external display (NEC 231WMi) too, but I can reconnect non–apple dock and I see correct external display working. Apple, please fix this bugs with external display too. Also appeared starting from macos 11.3 to 12 beta 2.