Big Sur panic when connect/disconnect usb-c dock

+1 on this 16" 2019 MBP 2.4 GHz 8-Core Intel Core i9 32GB 5600M 8 GB System ramps fans for a second then reboots when plugging in any external monitor, via a dock or EGPU. Running Big Sur 11.4 (20F71)

This only started happening after I tried booting hiveos.farm from an external USB stick, is this a zero-day / virus? Have done a clean install and restored from Time Machine, with the problem still persisting.

panic(cpu 5 caller 0xffffff800c49f846): [kext.kalloc.2048]: element modified after free (off:1672, val:0xfffffffe00000000, sz:2048, ptr:0xffffff938453e800, prot:zero) 1672: 0xfffffffe00000000 Backtrace (CPU 5), Frame : Return Address 0xffffffa137a5aac0 : 0xffffff800bc8e0dd 0xffffffa137a5ab10 : 0xffffff800bdd4f33 0xffffffa137a5ab50 : 0xffffff800bdc552a 0xffffffa137a5aba0 : 0xffffff800bc32a2f 0xffffffa137a5abc0 : 0xffffff800bc8d8fd 0xffffffa137a5ace0 : 0xffffff800bc8dbf3 0xffffffa137a5ad50 : 0xffffff800c49d81a 0xffffffa137a5adc0 : 0xffffff800c49f846 0xffffffa137a5b240 : 0xffffff800bcecad6 0xffffffa137a5b2b0 : 0xffffff800bc9d6bc 0xffffffa137a5b300 : 0xffffff800c3ae4f2 0xffffffa137a5b320 : 0xffffff800ed5a41c 0xffffffa137a5b340 : 0xffffff800ed683fc 0xffffffa137a5b3a0 : 0xffffff800ed5ab6e 0xffffffa137a5b440 : 0xffffff800ed5b98c 0xffffffa137a5b5a0 : 0xffffff800ed50377 0xffffffa137a5b600 : 0xffffff800ed502ee 0xffffffa137a5b7d0 : 0xffffff800ed45934 0xffffffa137a5b800 : 0xffffff800ed44abc 0xffffffa137a5b860 : 0xffffff800c48149d 0xffffffa137a5b890 : 0xffffff800bf47aa2 0xffffffa137a5b950 : 0xffffff800bf2d5f8 0xffffffa137a5bba0 : 0xffffff800bf2dffa 0xffffffa137a5bf40 : 0xffffff800c33fc9e 0xffffffa137a5bfa0 : 0xffffff800bc331f6 Kernel Extensions in backtrace: com.apple.security.sandbox(300.0)[C7CC6439-6854-33FB-9E97-F468B75AD280]@0xffffff800ed49000->0xffffff800ed8efff dependency: com.apple.driver.AppleMobileFileIntegrity(1.0.5)[366C7BD4-9502-3D1C-ABBE-DE9749913D0C]@0xffffff800d2c0000->0xffffff800d2d5fff dependency: com.apple.iokit.IOStorageFamily(2.1)[A0D72FE9-649B-316A-8B5C-934E295FF0B5]@0xffffff800e86d000->0xffffff800e87efff dependency: com.apple.kext.AppleMatch(1.0.0d1)[759DEBDE-C844-3703-A01C-4DF5EEA8F4ED]@0xffffff800d2bc000->0xffffff800d2befff com.apple.security.quarantine(4.0)[C9640864-54C2-36A7-A737-F77E9F54159E]@0xffffff800ed40000->0xffffff800ed47fff dependency: com.apple.kext.AppleMatch(1.0.0d1)[759DEBDE-C844-3703-A01C-4DF5EEA8F4ED]@0xffffff800d2bc000->0xffffff800d2befff dependency: com.apple.security.sandbox(300.0)[C7CC6439-6854-33FB-9E97-F468B75AD280]@0xffffff800ed49000->0xffffff800ed8efff

Process name corresponding to current thread: NotificationCenter Boot args: chunklist-security-epoch=0 -chunklist-no-rev2-dev

Mac OS version: 20F71

same here, it started from some versions ago and continue with the last one

Similar problem here. It happens when I connect to my dock, or I play with cable of external monitors. Also when the macbook pro goes to sleep then wake up, it can only detect one monitor. If I plug/unplug the cable of the other monitor, panic happens.

Been getting this since BigSur - seems to happen all the time now w/ 11.5 Beta (20G5023d) as well... frustrating because I opt'd into this to try and solve......

PLEASE HELP Apple!!!panic(cpu 8 caller 0xffffff800429a9b6): [kext.kalloc.2048]: element modified after free (off:1584, val:0x0000210100000000, sz:2048, ptr:0xffffff93631ab000, prot:zero) 1584: 0x0000210100000000 1592: 0x0000000b00005400 1600: 0x0000000000000009 1608: 0x0000020300000100 1616: 0x0000015400000154 1624: 0x0000000100000a00 1632: 0x000008340000041a 1640: 0x0000000000001400 Backtrace (CPU 8), Frame : Return Address 0xffffffb0d30eb200 : 0xffffff8003a8915d 0xffffffb0d30eb250 : 0xffffff8003bd0033 0xffffffb0d30eb290 : 0xffffff8003bc062a 0xffffffb0d30eb2e0 : 0xffffff8003a2da2f 0xffffffb0d30eb300 : 0xffffff8003a8897d 0xffffffb0d30eb420 : 0xffffff8003a88c73 0xffffffb0d30eb490 : 0xffffff800429898a 0xffffffb0d30eb500 : 0xffffff800429a9b6 0xffffffb0d30eb980 : 0xffffff8003ae7b56 0xffffffb0d30eb9f0 : 0xffffff8003a9873c 0xffffffb0d30eba40 : 0xffffff800414b4d4 0xffffffb0d30eba60 : 0xffffff7f92584786 0xffffffb0d30eba80 : 0xffffff7f9e7d85f7 0xffffffb0d30ebac0 : 0xffffff7f925a21ba 0xffffffb0d30ebae0 : 0xffffff7f9e7ed6b1 0xffffffb0d30ebb10 : 0xffffff7f9e7dc7ed 0xffffffb0d30ebb30 : 0xffffff7f9e7da0bc 0xffffffb0d30ebb60 : 0xffffff7f9e7ed032 0xffffffb0d30ebc80 : 0xffffff80041b9acb 0xffffffb0d30ebce0 : 0xffffff8004221eb3 0xffffffb0d30ebd40 : 0xffffff8003b7b4ff 0xffffffb0d30ebd90 : 0xffffff8003a8e7dd 0xffffffb0d30ebe00 : 0xffffff8003a64d75 0xffffffb0d30ebe60 : 0xffffff8003a7c392 0xffffffb0d30ebef0 : 0xffffff8003ba492d 0xffffffb0d30ebfa0 : 0xffffff8003a2e216 Kernel Extensions in backtrace: com.apple.iokit.IOAcceleratorFamily2(442.9)[C27F329B-4374-3FDD-A063-1D8839E43359]@0xffffff7f9e7af000->0xffffff7f9e819fff dependency: com.apple.driver.AppleMobileFileIntegrity(1.0.5)[F5BC1EC5-40C5-36E6-8F25-BA1DFE57654A]@0xffffff80050c0000->0xffffff80050d5fff dependency: com.apple.iokit.IOGraphicsFamily(585.1)[F90046E5-498D-3655-8D07-973C91D42972]@0xffffff7f9e930000->0xffffff7f9e95efff dependency: com.apple.iokit.IOPCIFamily(2.9)[80E510F8-4833-3B9E-B610-A9E308DB352E]@0xffffff800656b000->0xffffff8006593fff dependency: com.apple.iokit.IOReportFamily(47)[A5283FFC-0B0C-3409-A86B-0CBFBF53D863]@0xffffff80065a2000->0xffffff80065a4fff dependency: com.apple.iokit.IOSurface(290.8.1)[0C59147A-3B36-3576-81EA-8CFB6632EF09]@0xffffff8006695000->0xffffff80066b1fff com.apple.kext.AMDRadeonX6000(4.0.6)[A3B980AB-1FEE-307B-B1EF-679B54B35892]@0xffffff7f92582000->0xffffff7f926c2fff dependency: com.apple.iokit.IOAcceleratorFamily2(442.9)[C27F329B-4374-3FDD-A063-1D8839E43359]@0xffffff7f9e7af000->0xffffff7f9e819fff dependency: com.apple.iokit.IOGraphicsFamily(585.1)[F90046E5-498D-3655-8D07-973C91D42972]@0xffffff7f9e930000->0xffffff7f9e95efff dependency: com.apple.iokit.IOPCIFamily(2.9)[80E510F8-4833-3B9E-B610-A9E308DB352E]@0xffffff800656b000->0xffffff8006593fff dependency: com.apple.iokit.IOSurface(290.8.1)[0C59147A-3B36-3576-81EA-8CFB6632EF09]@0xffffff8006695000->0xffffff80066b1fff

Process name corresponding to current thread: firefox Boot args: chunklist-security-epoch=0 -chunklist-no-rev2-dev chunklist-security-epoch=0 -chunklist-no-rev2-dev

Mac OS version: 20G5023d

Kernel version: Darwin Kernel Version 20.6.0: Mon May 10 03:15:35 PDT 2021; root:xnu-7195.140.13.0.1~20/RELEASE_X86_64 Kernel UUID: 3893CD5D-E480-3097-A4F4-3F1A6D146AE4 KernelCache slide: 0x0000000003800000 KernelCache base: 0xffffff8003a00000 Kernel slide: 0x0000000003810000 Kernel text base: 0xffffff8003a10000 __HIB text base: 0xffffff8003900000 System model name: MacBookPro16,1 (Mac-E1008331FDC96864) System shutdown begun: NO Hibernation exit count: 10

Same problem on macOS 11.5 beta 2 . Error report: FB9125674

panic(cpu 1 caller 0xffffff801d89e926): [kext.kalloc.204😎 : element modified after free (off:1672, val😮 xffffffff00000000, sz:2048, ptr😮 xffffff93e2aa2000, prot😒 ero) 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😮 -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

I'm having the same issue when connecting one of my usb-c docks (CalDigit USB-C Pro Dock and StarTech.com Thunderbolt 3 Dock). MacBook Pro (16-inch, 2019) - macOS 11.4

0xffffffa12b02bfa0 : 0xffffff80014331f6
      Kernel Extensions in backtrace:
         com.apple.security.sandbox(300.0)[C7CC6439-6854-33FB-9E97-F468B75AD280]@0xffffff8004549000->0xffffff800458efff
            dependency: com.apple.driver.AppleMobileFileIntegrity(1.0.5)[366C7BD4-9502-3D1C-ABBE-DE9749913D0C]@0xffffff8002ac0000->0xffffff8002ad5fff
            dependency: com.apple.iokit.IOStorageFamily(2.1)[A0D72FE9-649B-316A-8B5C-934E295FF0B5]@0xffffff800406d000->0xffffff800407efff
            dependency: com.apple.kext.AppleMatch(1.0.0d1)[759DEBDE-C844-3703-A01C-4DF5EEA8F4ED]@0xffffff8002abc000->0xffffff8002abefff

Process name corresponding to current thread: lghub_agent

0xffffffa12af6bfa0 : 0xffffff8015033216
      Kernel Extensions in backtrace:
         com.apple.iokit.IOAcceleratorFamily2(442.9)[5523A2B9-D179-3560-9738-E720033965D7]@0xffffff7fae51a000->0xffffff7fae584fff
            dependency: com.apple.driver.AppleMobileFileIntegrity(1.0.5)[9B4B41D7-B68F-33D5-80A4-2C4C4A649F6D]@0xffffff80166b8000->0xffffff80166cdfff
            dependency: com.apple.iokit.IOGraphicsFamily(585.1)[CC341A35-707F-3C8B-8EFD-925F742166A1]@0xffffff7fae69b000->0xffffff7fae6c9fff
            dependency: com.apple.iokit.IOPCIFamily(2.9)[B99B3B05-71B8-3178-8C27-E0A0ACA9F16E]@0xffffff8017b5f000->0xffffff8017b87fff
            dependency: com.apple.iokit.IOReportFamily(47)[3F7604AB-EA65-3904-A1F4-AFEB25D288A7]@0xffffff8017b96000->0xffffff8017b98fff
            dependency: com.apple.iokit.IOSurface(290.7)[6AE0FD31-9444-350A-88A6-620DF634FF78]@0xffffff8017c89000->0xffffff8017ca5fff
         com.apple.kext.AMDRadeonX6000(4.0.4)[F9A8D4D1-CA26-3CD7-B8B5-0D9C0AF929A1]@0xffffff7fa3b7d000->0xffffff7fa3cb1fff
            dependency: com.apple.iokit.IOAcceleratorFamily2(442.9)[5523A2B9-D179-3560-9738-E720033965D7]@0xffffff7fae51a000->0xffffff7fae584fff
            dependency: com.apple.iokit.IOGraphicsFamily(585.1)[CC341A35-707F-3C8B-8EFD-925F742166A1]@0xffffff7fae69b000->0xffffff7fae6c9fff
            dependency: com.apple.iokit.IOPCIFamily(2.9)[B99B3B05-71B8-3178-8C27-E0A0ACA9F16E]@0xffffff8017b5f000->0xffffff8017b87fff
            dependency: com.apple.iokit.IOSurface(290.7)[6AE0FD31-9444-350A-88A6-620DF634FF78]@0xffffff8017c89000->0xffffff8017ca5fff

Process name corresponding to current thread: Google Chrome Helper (GPU)

0xffffffa12dd23fa0 : 0xffffff8001433216
      Kernel Extensions in backtrace:
         com.apple.iokit.IOAcceleratorFamily2(442.9)[5523A2B9-D179-3560-9738-E720033965D7]@0xffffff7f9a91a000->0xffffff7f9a984fff
            dependency: com.apple.driver.AppleMobileFileIntegrity(1.0.5)[9B4B41D7-B68F-33D5-80A4-2C4C4A649F6D]@0xffffff8002ab8000->0xffffff8002acdfff
            dependency: com.apple.iokit.IOGraphicsFamily(585.1)[CC341A35-707F-3C8B-8EFD-925F742166A1]@0xffffff7f9aa9b000->0xffffff7f9aac9fff
            dependency: com.apple.iokit.IOPCIFamily(2.9)[B99B3B05-71B8-3178-8C27-E0A0ACA9F16E]@0xffffff8003f5f000->0xffffff8003f87fff
            dependency: com.apple.iokit.IOReportFamily(47)[3F7604AB-EA65-3904-A1F4-AFEB25D288A7]@0xffffff8003f96000->0xffffff8003f98fff
            dependency: com.apple.iokit.IOSurface(290.7)[6AE0FD31-9444-350A-88A6-620DF634FF78]@0xffffff8004089000->0xffffff80040a5fff
         com.apple.kext.AMDRadeonX6000(4.0.4)[F9A8D4D1-CA26-3CD7-B8B5-0D9C0AF929A1]@0xffffff7f8ff7d000->0xffffff7f900b1fff
            dependency: com.apple.iokit.IOAcceleratorFamily2(442.9)[5523A2B9-D179-3560-9738-E720033965D7]@0xffffff7f9a91a000->0xffffff7f9a984fff
            dependency: com.apple.iokit.IOGraphicsFamily(585.1)[CC341A35-707F-3C8B-8EFD-925F742166A1]@0xffffff7f9aa9b000->0xffffff7f9aac9fff
            dependency: com.apple.iokit.IOPCIFamily(2.9)[B99B3B05-71B8-3178-8C27-E0A0ACA9F16E]@0xffffff8003f5f000->0xffffff8003f87fff
            dependency: com.apple.iokit.IOSurface(290.7)[6AE0FD31-9444-350A-88A6-620DF634FF78]@0xffffff8004089000->0xffffff80040a5fff

Process name corresponding to current thread: idea

still nothing fixed with 11.5 beta 2, whether Apple simply has no more priority on it or they can just add new bugs and not fix any more because missing knowledge on this topic.

I have the same problem on my MacBook Pro (16-inch, 2019), with the CalDigit USB-C Pro Dock (which is confusingly actually Thunderbolt 3). I have a 4K screen attached to the Dock over HDMI. I get the kernel panic with "modified after free" when I plug in the dock.

I'm pretty sure the kernel panics started with the Big Sur 11.3.1 update for me. The 11.4 update didn't fix it.

My wife is using the same dock with her M1 MacBook Air and does not see the issue.

I have had this happening for months now. This is becoming a daily pain to deal with at office now given how often I have to undock my MBP and move around. I finally got frustrated enough to reset my NVRAM/erase disk/reinstall Big Sur and it happened again immediately before I even starting reinstalling software.

It was bad enough having to unplug/replug the dock to just get my second monitor active again in the past. The kernel panics have made this so much worse.

I am using a CalDigit USB-C Pro Dock at work and a CalDigit TS3 Plus Thunderbolt 3 Dock at home, both cause the issue.

 1672: 0xfffffffe00000000
Backtrace (CPU 3), Frame : Return Address
0xffffffb0e409ac10 : 0xffffff801c48e0dd 
0xffffffb0e409ac60 : 0xffffff801c5d4f33 
0xffffffb0e409aca0 : 0xffffff801c5c552a 
0xffffffb0e409acf0 : 0xffffff801c432a2f 
0xffffffb0e409ad10 : 0xffffff801c48d8fd 
0xffffffb0e409ae30 : 0xffffff801c48dbf3 
0xffffffb0e409aea0 : 0xffffff801cc9d81a 
0xffffffb0e409af10 : 0xffffff801cc9f846 
0xffffffb0e409b390 : 0xffffff801c4ecad6 
0xffffffb0e409b400 : 0xffffff801c49d6bc 
0xffffffb0e409b450 : 0xffffff801cbae4f2 
0xffffffb0e409b470 : 0xffffff801f55a41c 
0xffffffb0e409b490 : 0xffffff801f5683fc 
0xffffffb0e409b4f0 : 0xffffff801f55ab6e 
0xffffffb0e409b590 : 0xffffff801f55cce7 
0xffffffb0e409b840 : 0xffffff801f55b073 
0xffffffb0e409b9a0 : 0xffffff801f56b882 
0xffffffb0e409bbb0 : 0xffffff801f56b564 
0xffffffb0e409bed0 : 0xffffff801cc79f5e 
0xffffffb0e409bf40 : 0xffffff801cb3fc9e 
0xffffffb0e409bfa0 : 0xffffff801c4331f6 
      Kernel Extensions in backtrace:
         com.apple.security.sandbox(300.0)[C7CC6439-6854-33FB-9E97-F468B75AD280]@0xffffff801f549000->0xffffff801f58efff
            dependency: com.apple.driver.AppleMobileFileIntegrity(1.0.5)[366C7BD4-9502-3D1C-ABBE-DE9749913D0C]@0xffffff801dac0000->0xffffff801dad5fff
            dependency: com.apple.iokit.IOStorageFamily(2.1)[A0D72FE9-649B-316A-8B5C-934E295FF0B5]@0xffffff801f06d000->0xffffff801f07efff
            dependency: com.apple.kext.AppleMatch(1.0.0d1)[759DEBDE-C844-3703-A01C-4DF5EEA8F4ED]@0xffffff801dabc000->0xffffff801dabefff

Process name corresponding to current thread: mds
Boot args: chunklist-security-epoch=0 -chunklist-no-rev2-dev

Mac OS version:
20F71

Kernel version:
Darwin Kernel Version 20.5.0: Sat May  8 05:10:33 PDT 2021; root:xnu-7195.121.3~9/RELEASE_X86_64
Kernel UUID: 52A1E876-863E-38E3-AC80-09BBAB13B752
KernelCache slide: 0x000000001c200000
KernelCache base:  0xffffff801c400000
Kernel slide:      0x000000001c210000
Kernel text base:  0xffffff801c410000
__HIB  text base: 0xffffff801c300000
System model name: MacBookPro16,1 (Mac-E1008331FDC96864)
System shutdown begun: NO
Hibernation exit count: 0

System uptime in nanoseconds: 5557308287228
Last Sleep:           absolute           base_tsc          base_nano
  Uptime  : 0x0000050de962eb77
  Sleep   : 0x00000360d7e59ac6 0x0000819188b511fa 0x0000035e0cc98a3f
  Wake    : 0x000003610ac134ae 0x000081dd606e7b8c 0x00000360e9e6e12e
last started kext at 5485587191614: >usb.cdc.acm	5.0.0 (addr 0xffffff7fb6fa2000, size 8192)
last stopped kext at 4030580153044: >usb.serial	6.0.0 (addr 0xffffff7fb700c000, size 20480)

I'm also seeing constant kernel panics when connecting/disconnecting my monitors. I have a 2021 16" MacBook Pro (2019 model, 2.3 GHz 8-Core Intel Core i9, 32 GB 2667 MHz DDR4, Intel UHD Graphics 630 1536 M😎 and am running Big Sur 11.3.1. The machine is only a couple of weeks old and I can easily reproduce the problem by simply connecting and disconnecting the monitor cable 2 or 3 times.

I initially thought the problem was my CalDigit TS3 Plus but I started to remove all peripherals to see what was causing the problem and eventually got to a single monitor (Dell U2415) and a single USB-C to DisplayPort cable - no dock or hub involved. I disconnected keyboard, trackpad, headphones, yubi key, etc etc. I even booted in safe mode but issue persists.

My crash report is the same as reported by most folks in this thread: panic(cpu 0 caller 0xffffff801d69f6b6): [kext.kalloc.2048]: element modified after free (off:1672, val:0xfffffffe00000000, sz:2048, ptr:0xffffff93926d4000, prot:zero)

The interesting bit I found was that everything works fine if I connect my monitors via HDMI rather than DisplayPort. So at the moment I have 2 external monitor connected via USB-C to HDMI cables (1 using the TS3 dock, and 1 using a cheap USB hub).

Reproduced in macOS 12 Monterey 🤦‍♂️

Every day this machine crashes, a top of the line 16" MBP. Now in Monterey?? 

Mine still crashes aswell, everyday after waking up, high fan, dead. restart with Errors.

I called Belkin Support, they told me they are aware of that Problem and it only appears on Big Sur. They can't do anything as the Device has no Firmware. It's totally up to Apple.

Same issue here for months, same two monitors or mostly after other monitors connected, eg TV in mtg room. Sometime just turning monitors on/off or unplugging/plugin the cable again. Also in 11.4 😦

Belkin has official Announcement about Macbook Pros 2019 - 2020: https://www.belkin.com/de/support-article?articleNum=318353

I have had the same problem on Big Sur using a Dell WD19TB Thunderbolt Docking Station.

 1584: 0x0000210100000000
 1592: 0x0000000b00005400
 1600: 0x0000000000000009
 1608: 0x0000020300000100
 1616: 0x0000015400000154
 1624: 0x0000000100000a00
 1632: 0x000008340000041a
 1640: 0x0000000000001400
Backtrace (CPU 10), Frame : Return Address
0xffffffa0d3562cf0 : 0xffffff8009a8e0dd 
0xffffffa0d3562d40 : 0xffffff8009bd4f33 
0xffffffa0d3562d80 : 0xffffff8009bc552a 
0xffffffa0d3562dd0 : 0xffffff8009a32a2f 
0xffffffa0d3562df0 : 0xffffff8009a8d8fd 
0xffffffa0d3562f10 : 0xffffff8009a8dbf3 
0xffffffa0d3562f80 : 0xffffff800a29d81a 
0xffffffa0d3562ff0 : 0xffffff800a29f846 
0xffffffa0d3563470 : 0xffffff8009aecad6 
0xffffffa0d35634e0 : 0xffffff8009a9d6bc 
0xffffffa0d3563530 : 0xffffff800a1ae4f2 
0xffffffa0d3563550 : 0xffffff7fa3ef8fce 
0xffffffa0d3563600 : 0xffffff7fa3ef965e 
0xffffffa0d3563640 : 0xffffff7fa3eb9d86 
0xffffffa0d3563660 : 0xffffff7fa47f3e78 
0xffffffa0d3563900 : 0xffffff7fa3eba924 
0xffffffa0d3563930 : 0xffffff7fa47f5074 
0xffffffa0d35639c0 : 0xffffff7fa47f30f7 
0xffffffa0d3563a10 : 0xffffff7fa47f2ee7 
0xffffffa0d3563a60 : 0xffffff7fa47f1f99 
0xffffffa0d3563aa0 : 0xffffff800a21e13e 
0xffffffa0d3563af0 : 0xffffff7fa3eba5e2 
0xffffffa0d3563b20 : 0xffffff800a22837b 
0xffffffa0d3563c80 : 0xffffff8009b80961 
0xffffffa0d3563d90 : 0xffffff8009a9375d 
0xffffffa0d3563e00 : 0xffffff8009a69cf5 
0xffffffa0d3563e60 : 0xffffff8009a81312 
0xffffffa0d3563ef0 : 0xffffff8009ba982d 
0xffffffa0d3563fa0 : 0xffffff8009a33216 
      Kernel Extensions in backtrace:
         com.apple.iokit.IOAcceleratorFamily2(442.9)[BDA1401D-563F-3650-B616-C8073E90475B]@0xffffff7fa47ae000->0xffffff7fa4818fff
            dependency: com.apple.driver.AppleMobileFileIntegrity(1.0.5)[366C7BD4-9502-3D1C-ABBE-DE9749913D0C]@0xffffff800b0c0000->0xffffff800b0d5fff
            dependency: com.apple.iokit.IOGraphicsFamily(585.1)[2C81B74F-C771-3643-82EC-12CD4AC5EFDB]@0xffffff7fa492f000->0xffffff7fa495dfff
            dependency: com.apple.iokit.IOPCIFamily(2.9)[99A70889-A31C-3B25-8E88-ADD3F317E4E4]@0xffffff800c56a000->0xffffff800c592fff
            dependency: com.apple.iokit.IOReportFamily(47)[367CCAE7-DAB4-3424-B191-44044619D5CB]@0xffffff800c5a1000->0xffffff800c5a3fff
            dependency: com.apple.iokit.IOSurface(290.8.1)[8FA218E4-361C-3C8B-94F0-48434AA535A0]@0xffffff800c694000->0xffffff800c6b0fff
         com.apple.driver.AppleIntelKBLGraphics(16.0.4)[F7BCF586-AF08-3277-9C66-04F439E684B4]@0xffffff7fa3ea3000->0xffffff7fa3f5afff
            dependency: com.apple.iokit.IOAcceleratorFamily2(442.9)[BDA1401D-563F-3650-B616-C8073E90475B]@0xffffff7fa47ae000->0xffffff7fa4818fff
            dependency: com.apple.iokit.IOGraphicsFamily(585.1)[2C81B74F-C771-3643-82EC-12CD4AC5EFDB]@0xffffff7fa492f000->0xffffff7fa495dfff
            dependency: com.apple.iokit.IOPCIFamily(2.9)[99A70889-A31C-3B25-8E88-ADD3F317E4E4]@0xffffff800c56a000->0xffffff800c592fff
            dependency: com.apple.iokit.IOSurface(290.8.1)[8FA218E4-361C-3C8B-94F0-48434AA535A0]@0xffffff800c694000->0xffffff800c6b0fff

Process name corresponding to current thread: TouchBarServer
Boot args: chunklist-security-epoch=0 -chunklist-no-rev2-dev chunklist-security-epoch=0 -chunklist-no-rev2-dev

Mac OS version:
20F71

Kernel version:
Darwin Kernel Version 20.5.0: Sat May  8 05:10:33 PDT 2021; root:xnu-7195.121.3~9/RELEASE_X86_64
Kernel UUID: 52A1E876-863E-38E3-AC80-09BBAB13B752
KernelCache slide: 0x0000000009800000
KernelCache base:  0xffffff8009a00000
Kernel slide:      0x0000000009810000
Kernel text base:  0xffffff8009a10000
__HIB  text base: 0xffffff8009900000
System model name: MacBookPro16,1 (Mac-E1008331FDC96864)
System shutdown begun: NO
Hibernation exit count: 12

System uptime in nanoseconds: 44120622946291
Last Sleep:           absolute           base_tsc          base_nano
  Uptime  : 0x00002820a20edafc
  Sleep   : 0x0000281a9b5f8e9a 0x0000000201beb7d4 0x0000280af830fca7
  Wake    : 0x0000281abf2d9789 0x0000000200a50fbc 0x0000281aaa3beba3
last started kext at 14175647796: >AGPM	122.1 (addr 0xffffff7fa31a3000, size 118784)
loaded kexts:

Dear Apple Support & Engineers

The is simply unacceptable. I get 2 crashes per day!!!

I first reported this 2 months ago, after the first crash, right after the update to Big Sur 11.3 Then updated to 11.4 hoping it would fix it? Of course, it didn't.

The issue is with osX. I tried 5 different docks, my CalDigit and 4 that I borrowed from colleagues at the office (CalDigit, HP, StartTech, some no-name from Amazon & Microsoft one), all having the same problem with I connect my MacBook Pro 16 (it's less than 9 month old!!) - it crashes within 10 seconds of connecting to dock. I have to reboot it.

The crash report is different every time too? See attached samples from the past few weeks

RIDICULOUS!!

1. crash_report_202106220852.txt
2. crash_report_202106161018.txt
3. crash_report_202106160010.txt
4. crash_report_202005101310.txt
5. crash_report_202005061010.txt

This is getting ridiculous, I keep getting interrupted in my work because of this. Apple what are you doing ? You still have to support the intel based hardware !!

@apple can you please take this seriously.

This has been going for months - many threads in apple developer, reddit, news articles, etc but still no fix. I'm on big sur 11.4, this problem always happens when connecting to dock.

Submitted to APPLE so many times.

Details:

MacBook Pro (16-inch, 2019) 2.6 GHz 6-Core Intel Core i7 AMD Radeon Pro 5300M 4 GB Intel UHD Graphics 630 1536 MB

panic(cpu 4 caller 0xffffff8013a9f846): [kext.kalloc.2048]: element modified after free (off:1672, val:0xffffffff00000000, sz:2048, ptr:0xffffff9372beb000, prot:zero) 1672: 0xffffffff00000000 Backtrace (CPU 4), Frame : Return Address 0xffffffa0c6882c10 : 0xffffff801328e0dd .... Kernel Extensions in backtrace: com.apple.kext.AMDRadeonX6000Framebuffer(4.0.5)[57D9B457-0E07-3304-B3E5-2D05A3E6FB13]@0xffffff7fa1ef6000->0xffffff7fa2170fff dependency: com.apple.AppleGraphicsDeviceControl(6.3.3)[6E0CE02A-0480-3500-9A25-9CD277522DF9]@0xffffff7fac94a000->0xffffff7fac94dfff dependency: com.apple.iokit.IOACPIFamily(1.4) .... Process name corresponding to current thread: kernel_task Boot args: chunklist-security-epoch=0 -chunklist-no-rev2-dev chunklist-security-epoch=0 -chunklist-no-rev2-dev

Mac OS version: 20F71

Kernel version: Darwin Kernel Version 20.5.0: Sat May 8 05:10:33 PDT 2021; root:xnu-7195.121.3~9/RELEASE_X86_64

Hi all, found this thread by googling the first line of my crash report.

I am getting the exact same issue (16", 11.4) only I am using the Pluggable TBT3-UDZ TB3 dock.

The issue seemed to be related often to one of my external monitors turning on/off or the cables being plugged in or out. I'd get the fan whir and a crash out to restart. It sometime happened when the dock itself was plugged in or out (which would of course include the monitors disconnecting). The only time it happened when I left the dock connected was when the monitors were doing something.

Switching to the HDMI ports on the dock from DP (this dock offers the choice of DP or HDMI for both of it's outputs thankfully) seems to have fixed the issue. My guess is that it is related to the signal that Display port sends back to the computer (called EDID?) to tell it whether the monitor is switched on or not. On DP, if I turned a monitor off it would blank out the other displays for a moment and rejig the arrangement in settings. With HDMI, turning the monitor off doesn't do this and the monitor is still listed in settings.

Hopefully that helps someone else out until apple pull their socks up!

Richard.

Unfortunately no answer here, just here to tell that I'm experiencing the same and know how to reproduce it without even using a dock. I need to connect my Dell monitor via USB-C on one of the 2 DisplayPort connections on the monitor. Then I need to turn the display on and off and then it will crash (not all the time, but quite soon).

I've raised a call with Apple Support about this. But apple claims it's a problem with my hardware and not with their software. So now I need to visit a service center to proof that it's their software and not my hardware that is causing the issue.

I am also seeing exactly same thing. Not sure if this is hardware issue/software issue ..or what. Here is crash report, seeing every time laptop goes to sleep. I have thinkvision monitor connected via USB C cable to macbook pro 16" 2019.

====== panic(cpu 10 caller 0xffffff8013c9f846): [kext.kalloc.2048]: element modified after free (off:1672, val:0xfffffffe00000000, sz:2048, ptr:0xffffff9372fb4000, prot:zero)

 1672: 0xfffffffe00000000

Backtrace (CPU 10), Frame : Return Address

0xffffffb0db5aacf0 : 0xffffff801348e0dd

0xffffffb0db5aad40 : 0xffffff80135d4f33

0xffffffb0db5aad80 : 0xffffff80135c552a

0xffffffb0db5aadd0 : 0xffffff8013432a2f

0xffffffb0db5aadf0 : 0xffffff801348d8fd

0xffffffb0db5aaf10 : 0xffffff801348dbf3

0xffffffb0db5aaf80 : 0xffffff8013c9d81a

0xffffffb0db5aaff0 : 0xffffff8013c9f846

0xffffffb0db5ab470 : 0xffffff80134ecad6

0xffffffb0db5ab4e0 : 0xffffff801349d6bc

0xffffffb0db5ab530 : 0xffffff8013bae4f2

0xffffffb0db5ab550 : 0xffffff7fad8f8fce

0xffffffb0db5ab600 : 0xffffff7fad8f965e

0xffffffb0db5ab640 : 0xffffff7fad8b9d86

0xffffffb0db5ab660 : 0xffffff7fae1f3e78

0xffffffb0db5ab900 : 0xffffff7fad8ba924

0xffffffb0db5ab930 : 0xffffff7fae1f5074

0xffffffb0db5ab9c0 : 0xffffff7fae1f30f7

0xffffffb0db5aba10 : 0xffffff7fae1f2ee7

0xffffffb0db5aba60 : 0xffffff7fae1f1f99

0xffffffb0db5abaa0 : 0xffffff8013c1e13e

0xffffffb0db5abaf0 : 0xffffff7fad8ba5e2

0xffffffb0db5abb20 : 0xffffff8013c2837b

0xffffffb0db5abc80 : 0xffffff8013580961

0xffffffb0db5abd90 : 0xffffff801349375d

0xffffffb0db5abe00 : 0xffffff8013469cf5

0xffffffb0db5abe60 : 0xffffff8013481312

0xffffffb0db5abef0 : 0xffffff80135a982d

0xffffffb0db5abfa0 : 0xffffff8013433216

      Kernel Extensions in backtrace:

         com.apple.iokit.IOAcceleratorFamily2(442.9)[BDA1401D-563F-3650-B616-C8073E90475B]@0xffffff7fae1ae000->0xffffff7fae218fff

            dependency: com.apple.driver.AppleMobileFileIntegrity(1.0.5)[366C7BD4-9502-3D1C-ABBE-DE9749913D0C]@0xffffff8014ac0000->0xffffff8014ad5fff

            dependency: com.apple.iokit.IOGraphicsFamily(585.1)[2C81B74F-C771-3643-82EC-12CD4AC5EFDB]@0xffffff7fae32f000->0xffffff7fae35dfff

            dependency: com.apple.iokit.IOPCIFamily(2.9)[99A70889-A31C-3B25-8E88-ADD3F317E4E4]@0xffffff8015f6a000->0xffffff8015f92fff

            dependency: com.apple.iokit.IOReportFamily(47)[367CCAE7-DAB4-3424-B191-44044619D5CB]@0xffffff8015fa1000->0xffffff8015fa3fff

            dependency: com.apple.iokit.IOSurface(290.8.1)[8FA218E4-361C-3C8B-94F0-48434AA535A0]@0xffffff8016094000->0xffffff80160b0fff

         com.apple.driver.AppleIntelKBLGraphics(16.0.4)[F7BCF586-AF08-3277-9C66-04F439E684B4]@0xffffff7fad8a3000->0xffffff7fad95afff

            dependency: com.apple.iokit.IOAcceleratorFamily2(442.9)[BDA1401D-563F-3650-B616-C8073E90475B]@0xffffff7fae1ae000->0xffffff7fae218fff

            dependency: com.apple.iokit.IOGraphicsFamily(585.1)[2C81B74F-C771-3643-82EC-12CD4AC5EFDB]@0xffffff7fae32f000->0xffffff7fae35dfff

            dependency: com.apple.iokit.IOPCIFamily(2.9)[99A70889-A31C-3B25-8E88-ADD3F317E4E4]@0xffffff8015f6a000->0xffffff8015f92fff

            dependency: com.apple.iokit.IOSurface(290.8.1)[8FA218E4-361C-3C8B-94F0-48434AA535A0]@0xffffff8016094000->0xffffff80160b0fff

Process name corresponding to current thread: WindowServer

Boot args: chunklist-security-epoch=0 -chunklist-no-rev2-dev chunklist-security-epoch=0 -chunklist-no-rev2-dev

Mac OS version:

20F71

I had this problem too I removed my ethernet cable from the belkin hub and now its working.

Question to all who have this issue: does your macbook pro have the extra AMD video card in it? Since I went to an apple support center today, assuming I would be able to crash one of their systems as well. Unfortunately I was not able to. But they didn’t have a model with the AMD Radeon Pro in it.

I’m going to an Apple Store next Monday to see if I’ll be able to crash one of their systems, with an AMD onboard. I assume it will be a success, seeing so many here and on reddit having the same issue. But if you have this issue also on macbooks without the AMD in it, then I’m less confident that I’ve isolated the causing factors.

Are you connecting your monitor via DisplayPort? Try using HDMI instead - my laptop only crashes with DisplayPort, never with HDMI. Also, try connecting your monitor without the dock (get a USB-C to HDMI cable) to rule out a problem with dock