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.

Reproduced in macOS 12 Monterey 🤦‍♂️

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

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

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.

Not fixed in 11.4, 11.5 beta 1 !

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!!!

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.