Big Sur panic when connect/disconnect usb-c dock

Same issue I am observing on my MBP 16".
Any tips/tricks to resolve this issue?

Same problem here. Started with Big Sur. Crash after crash all day. MacBook Pro (16-inch, 2019)

panic(cpu 2 caller 0xffffff8007c9f6b6): [kext.kalloc.2048]: element modified after free (off:1672, val:0xffffffff00000000, sz:2048, ptr:0xffffff9366c03000, prot:zero)
1672: 0xffffffff00000000
Backtrace (CPU 2), Frame : Return Address
0xffffffb0baf631f0 : 0xffffff800748e02d
0xffffffb0baf63240 : 0xffffff80075d48e3
0xffffffb0baf63280 : 0xffffff80075c4eda
0xffffffb0baf632d0 : 0xffffff8007432a2f
0xffffffb0baf632f0 : 0xffffff800748d84d
0xffffffb0baf63410 : 0xffffff800748db43
0xffffffb0baf63480 : 0xffffff8007c9d68a
0xffffffb0baf634f0 : 0xffffff8007c9f6b6
0xffffffb0baf63970 : 0xffffff80074ec816
0xffffffb0baf639e0 : 0xffffff800749d60c
0xffffffb0baf63a30 : 0xffffff8007baf582
0xffffffb0baf63a50 : 0xffffff80086ebcd5
0xffffffb0baf63a70 : 0xffffff80086ebb70
0xffffffb0baf63b30 : 0xffffff80086724c2
0xffffffb0baf63bf0 : 0xffffff800872227d
0xffffffb0baf63de0 : 0xffffff8007bf54f5
0xffffffb0baf63e50 : 0xffffff8007bf53f6
0xffffffb0baf63e80 : 0xffffff80074d44b5
0xffffffb0baf63ef0 : 0xffffff80074d5424
0xffffffb0baf63fa0 : 0xffffff800743213e
Kernel Extensions in backtrace:
com.apple.driver.AppleBCMWLANCoreMac(1.0)[C29067F6-27FA-3A3A-8DA4-C7AEF8E6AF0C]@0xffffff8008635000->0xffffff80087ebfff
dependency: com.apple.driver.AppleMobileFileIntegrity(1.0.5)[9B4B41D7-B68F-33D5-80A4-2C4C4A649F6D]@0xffffff8008ab8000->0xffffff8008acdfff
dependency: com.apple.driver.IOImageLoader(1.0.0)[ACD7D7B1-169D-3541-8746-4856B308ACB2]@0xffffff8009c89000->0xffffff8009c99fff
dependency: com.apple.driver.corecapture(1.0.4)[4D0B62A8-C973-3B21-9252-4A5E7DF3B885]@0xffffff800a714000->0xffffff800a72afff
dependency: com.apple.driver.mDNSOffloadUserClient(1.0.1b8)[B5B3AA31-2371-332B-82C7-ED3711EABDEF]@0xffffff8009f59000->0xffffff8009f5dfff
dependency: com.apple.iokit.CoreAnalyticsFamily(1)[D5B09BBE-AC6C-341E-A9FE-B37DF7FDCE68]@0xffffff8008d65000->0xffffff8008d6bfff
dependency: com.apple.iokit.IO80211FamilyV2(1200.12.2b1)[A068D9D6-2542-3455-8143-F5BBD4334151]@0xffffff8009895000->0xffffff8009a18fff
dependency: com.apple.iokit.IONetworkingFamily(3.4)[EFF68ECC-483B-3BAC-82B9-09C8F0600009]@0xffffff8009cd2000->0xffffff8009ce8fff
dependency: com.apple.iokit.IOSerialFamily(11)[9787C647-19B8-36EB-BC27-2CD8D028FABF]@0xffffff800a01b000->0xffffff800a020fff
dependency: com.apple.iokit.IOSkywalkFamily(1)[8E95C676-D763-3923-BE43-E8BE08DD3C23]@0xffffff800a02a000->0xffffff800a04bfff
dependency: com.apple.iokit.IOTimeSyncFamily(980.4)[A5FA159E-C468-37EB-92A2-A4B6E527C671]@0xffffff800a1ac000->0xffffff800a1c7fff
dependency: com.apple.kec.corecrypto(11.1)[00A376AB-A0BD-3B83-A12D-A7039E31BD9B]@0xffffff800a736000->0xffffff800a7c7fff

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:
20E241

Kernel version:
Darwin Kernel Version 20.4.0: Thu Apr 22 21:46:47 PDT 2021; root:xnu-7195.101.2~1/RELEASE_X86_64
Kernel UUID: 068F99A3-1DB3-31C0-87D5-09942F122BB6
KernelCache slide: 0x0000000007200000
KernelCache base: 0xffffff8007400000
Kernel slide: 0x0000000007210000
Kernel text base: 0xffffff8007410000
__HIB text base: 0xffffff8007300000
System model name: MacBookPro16,4 (Mac-A61BADE1FDAD7B05)
System shutdown begun: NO
Hibernation exit count: 0

System uptime in nanoseconds: 18554309350938
Last Sleep: absolute base_tsc base_nano
Uptime : 0x000010e003049a84
Sleep : 0x000001f9d400c38c 0x000004a59de19064 0x000000f61f051360
Wake : 0x000001fa043a6403 0x00000795e257f4dc 0x000001f9e4b7dd41
last started kext at 14610385052928: com.logitech.driver.LogiGamingMouseFilter 1 (addr 0xffffff7fa2628000, size 8192)
last stopped kext at 14680012327057: >!UAudio 405.39 (addr 0xffffff7fa0712000, size 315392)

Same issue with dock station when monitor connected to dock (Display Port). HP USB-C Dock G5. Seems it's only affected MBP 16. Tested on 11 MacBook Pro (16-inch, 2019).
Big Sur 11.3.1 (11.0.1, 11.2.3, 11.3, 11.3.1)

"Glad" to hear I'm not the only one .

Symptoms

1. Having the same issue with my 2 CalDigit USB-C Pro docks (one at home, one at work). When I move my MBP 16, 2019 between locations, my MBP crashes about 10-15 seconds after reconnecting to the dock at the new location.

2. Also, can happen if I power cycle my dock (not consistently thou)

3. Dis/Re/connecting to the same dock seems to be better (only 1 crash during my testing) (in a time period of a couple of minutes)

Causes (possible)

1. The issues started occurring after the BigSur update 2 weeks ago to 11.3.1 from 11.3.0

2. Since I have 2 different docks, the only thing in common is my MBP & BigSur update, I think that was the culprit.

3. Attached is the latest crash report from Monday.

Solution (attempts)

1. Tried resetting NVRAM

2. Tried resetting SMC

Talking to support

1. Contacted CalDigit support - they have no suggestions, other than saying they had no other reports of this issue.

2. I submitted every crash report to Apple, also tried my luck on the community forums, to no avail. The suggestion there was to wipe OS and restore from backup (not sure how that would help if the problem has to do with OS update), but will attempt that next, (over the weekend) just to eliminate it as a possible solution.

P.S.:
Also getting a bit frustrated, with all the crashes.

Just adding another crash report from last Friday

MacBook Pro (16-inch, 2019) + ZMUIPNG dock same problem. Started happening after update to BigSur. I'm currently on 11.3, so based on previous comment likely I'll not get problem resolved on 11.3.1 :( This is my first ever MacBook, guess what is my impression right now

I'm having the exact same problem with no peripherals - MacBook Pro (16-inch 2019), 2.3 processor.

I'm having the exact same problem as described above - multiple crashes a day, occurring after the latest upgrade to 11.3.1. The crashes occur at random times - everywhere from restarting Docker to visiting target.com or even waking up my machine from sleep. I rarely have any notice, but during a handful of times, I lose Internet/VPN connection for a second or two before fully crashing. I've seen so many different error messages that I have a separate text file with a number of them:

"Possible memory corruption: pmap_pv_remove(0xffffff8745b18b40,0x7f805f265000,0x1000, 0x10000001000000, 0xffffffa151a33334, 0xffffffa151a332f8): null pv_list, priors: 2"@/AppleInternal/BuildRoot/Library/Caches/com.apple.xbs/Sources/xnu/xnu-7195.81.3/osfmk/i386/pmap_internal.h:903

Kernel trap at 0xffffff80037ba3df, type 14=page fault, registers:

"Bad list head 0xffffffa1b62ee160 first->prev != head @2320"@/System/Volumes/Data/SWE/macOS/BuildRoots/2288acc43c/Library/Caches/com.apple.xbs/Sources/xnu/xnu-7195.101.2/bsd/vfs/vfs_cache.c:2320

[data.kalloc.4096]: element modified after free (off:1184, val:0x0000000008000000, sz:4096, ptr:0xffffff93cb553000, prot:zero)

I've run various diagnostics tools, booted in Safe Mode, reset NVRAM, no luck for anything. Earlier this week, I made it 28 hours without a crash, but now I'm back to multiple crashes a day.

Same Problem here "panic(cpu 0 caller 0xffffff8013a9f6b6): [kext.kalloc.2048]: element modified after free "

MacBook Pro (16 Zoll, 2019)
2,3 GHz 8-Core Intel Core i9
Display 27-Zoll (1920 × 1080) via DP over CalDigit 3 Station.
It seems like if the Laptop goes into sleep / Screensaver... If i wake up, or nearly EVERY morning = it reboots because it crashed somewhere in Night.

I'm getting the same problem. Macbook Pro 16 (2019). Seemed to start occurring after a recent Big Sur update:

panic(cpu 9 caller 0xffffff800669f6b6): [kext.kalloc.2048]: element modified after free (off:1672, val:0xfffffffe00000000, sz:2048, ptr:0xffffff937da7c800, prot:zero)
1672: 0xfffffffe00000000
Backtrace (CPU 9), Frame : Return Address
0xffffffa132adaa80 : 0xffffff8005e8e02d
0xffffffa132adaad0 : 0xffffff8005fd48e3
0xffffffa132adab10 : 0xffffff8005fc4eda
0xffffffa132adab60 : 0xffffff8005e32a2f
0xffffffa132adab80 : 0xffffff8005e8d84d
0xffffffa132adaca0 : 0xffffff8005e8db43
0xffffffa132adad10 : 0xffffff800669d68a
0xffffffa132adad80 : 0xffffff800669f6b6
0xffffffa132adb200 : 0xffffff8005eec816
0xffffffa132adb270 : 0xffffff8005e9d60c
0xffffffa132adb2c0 : 0xffffff80065af582
0xffffffa132adb2e0 : 0xffffff8008f4d73c
0xffffffa132adb300 : 0xffffff8008f5b71c
0xffffffa132adb360 : 0xffffff8008f4de8e
0xffffffa132adb400 : 0xffffff8008f50007
0xffffffa132adb6b0 : 0xffffff8008f4e393
0xffffffa132adb810 : 0xffffff8008f479e5
0xffffffa132adba10 : 0xffffff8006682f9a
0xffffffa132adba50 : 0xffffff80060f19dc
0xffffffa132adbc20 : 0xffffff80060f41a9
0xffffffa132adbd20 : 0xffffff80060f70e0
0xffffffa132adbf40 : 0xffffff8006540dae
0xffffffa132adbfa0 : 0xffffff8005e331f6
Kernel Extensions in backtrace:
com.apple.security.sandbox(300.0)[A8EB8B72-CF6C-313B-96B9-B5BDA3C48E03]@0xffffff8008f3c000->0xffffff8008f81fff
dependency: com.apple.driver.AppleMobileFileIntegrity(1.0.5)[9B4B41D7-B68F-33D5-80A4-2C4C4A649F6D]@0xffffff80074b8000->0xffffff80074cdfff
dependency: com.apple.iokit.IOStorageFamily(2.1)[58EA4506-4E6B-3AC3-A70D-ED35EE2C381D]@0xffffff8008a62000->0xffffff8008a73fff
dependency: com.apple.kext.AppleMatch(1.0.0d1)[47674A56-91B7-3A68-835F-A96648461333]@0xffffff80074b4000->0xffffff80074b6fff

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

Mac OS version:
20E241

Kernel version:
Darwin Kernel Version 20.4.0: Thu Apr 22 21:46:47 PDT 2021; root:xnu-7195.101.2~1/RELEASE_X86_64
Kernel UUID: 068F99A3-1DB3-31C0-87D5-09942F122BB6
KernelCache slide: 0x0000000005c00000
KernelCache base: 0xffffff8005e00000
Kernel slide: 0x0000000005c10000
Kernel text base: 0xffffff8005e10000
__HIB text base: 0xffffff8005d00000
System model name: MacBookPro16,1 (Mac-E1008331FDC96864)
System shutdown begun: NO
Hibernation exit count: 44

System uptime in nanoseconds: 161940436870002
Last Sleep: absolute base_tsc base_nano
Uptime : 0x00009348b236ebe4
Sleep : 0x00006922e12f9603 0x00009f11c7dab7ea 0x00006916f2c4258e
Wake : 0x0000692313e0179e 0x00009f49a8fbd090 0x00006922f30d5d5e
last started kext at 97018319064226: >AudioAUUC 1.70 (addr 0xffffff7f9f18c000, size 12288)
last stopped kext at 94784630241352: >!UAudio 405.39 (addr 0xffffff7f9f112000, size 315392)
loaded kexts:
com.box.filesystems.osxfuse 403.11.2

AudioAUUC 1.70
@filesystems.smbfs 3.5
AGPM 122
!APlatformEnabler 2.7.0d0
X86PlatformShim 1.0.0
@filesystems.autofs 3.0
@fileutil 20.036.15
!ATopCaseHIDEventDriver 4040.11
!AHIDALSService 1
@kext.AMDRadeonX6000 4.0.4
!AUpstreamUserClient 3.6.8
@kext.AMDRadeonServiceManager 4.0.4
!A!IKBLGraphics 16.0.2
!A!ICFLGraphicsFramebuffer 16.0.2
!AGraphicsDevicePolicy 6.2.9
BridgeAudioCommunication 140.4
!AAVEBridge 6.1
!AThunderboltIP 4.0.3
@AGDCPluginDisplayMetrics 6.2.9
pmtelemetry 1
|IOUserEthernet 1.0.1
usb.!UUserHCI 1
|IO!BSerialManager 8.0.4d18
@Dont_Steal_Mac_OS_X 7.0.0
!AHV 1
!ADiskImages2 1
!A!ISlowAdaptiveClocking 4.0.0
!A!IPCHPMC 2.0.1
!ABridgeAudio!C 140.4
AGDCBacklightControl 6.2.9
!AMCCSControl 1.14
!AGFXHDA 100.1.433
!AMuxControl2 6.2.9
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 1677.100.114
@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
!UAudio 405.39
@kext.triggers 1.0
!AHS!BDriver 4040.11
IO!BHIDDriver 8.0.4d18
!AActuatorDriver 4440.3
!AMultitouchDriver 4440.3
!AInputDeviceSupport 4400.35
!AHIDKeyboard 224
@kext.AMDRadeonX6100HWLibs 1.0
@kext.AMDRadeonX6000HWServices 4.0.4
X86PlatformPlugin 1.0.0
|IOAccelerator!F2 442.9
|IO!BHost!CUARTTransport 8.0.4d18
|IO!BHost!CTransport 8.0.4d18
!A!ILpssUARTv1 3.0.60
!A!ILpssUARTCommon 3.0.60
!AOnboardSerial 1.0
!AThunderboltDPOutAdapter 8.1.4
|IOAVB!F 940.4
|IOEthernetAVB!C 1.1.0
@!AGPUWrangler 6.2.9
|IOSlowAdaptiveClocking!F 1.0.0
IOPlatformPlugin!F 6.0.0d8
!ABacklightExpert 1.1.0
!ASMBus!C 1.0.18d1
|IONDRVSupport 585.1
|IOAudio!F 300.6.1
@vecLib.kext 1.2.0
@kext.AMDRadeonX6000Framebuffer 4.0.4
@kext.AMDSupport 4.0.4
!AGraphicsControl 6.2.9
@!AGraphicsDeviceControl 6.2.9
|IOGraphics!F 585.1
@plugin.IOgPTPPlugin 980.4
usb.IOUSBHostHIDDevice 1.2
usb.cdc.ncm 5.0.0
usb.cdc.ecm 5.0.0
usb.!UHub 1.2
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 290.7
@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 980.4
|IONetworking!F 3.4
DiskImages 493.0.0
|IO!B!F 8.0.4d18
|IOReport!F 47
|IO!BPacketLogger 8.0.4d18
$quarantine 4
$sandbox 300.0
@kext.!AMatch 1.0.0d1
|CoreAnalytics!F 1
!ASSE 1.0
!AKeyStore 2
!UTDM 511.101.1
|IOUSBMass!SDriver 184.101.1
|IOSCSIBlockCommandsDevice 436.100.4
|IO!S!F 2.1
|IOSCSIArchitectureModel!F 436.100.4
!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

All it takes to run into this issue is turn monitor off then on, don't even need to disconnect any cables

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.

I'm having the same issue every day since last OS update. Macbook Pro 16 with ZMUIPNG USB dock.

"panicFlags" : "0x902",
"panicString" : "panic(cpu 1 caller 0xfffffff013a03448): macOS panic detected\nDebugger message: panic\nMemory ID: 0x6\nOS release type: User\nOS version: 18P4556\nmacOS version: 20E241\nKernel version: Darwin Kernel Version 20.4.0: Thu Mar 4 23:34:36 PST 2021; root:xnu-7195.101.1~1\/RELEASE_ARM64_T8010\nKernel UUID: 3FA744A7-0F34-36DA-AA6D-F6503A3176ED\niBoot version: iBoot-6723.101.4\nsecure boot?: YES\nx86 EFI Boot State: 0xd\nx86 System State: 0x0\nx86 Power State: 0x0\nx86 Shutdown Cause: 0x5\nx86 Previous Power Transitions: 0x304050400\nPCIeUp link state: 0x89271614\nPaniclog version: 13\nKernel slide: 0x000000000bab8000\nKernel text base: 0xfffffff012abc000\nmach_absolute_time: 0x265f479332\nEpoch Time: sec usec\n Boot : 0x60a8eb5e 0x000d6cba\n Sleep : 0x60a9f55a 0x00040aa1\n Wake : 0x60a9f85c 0x0004b7ab\n Calendar: 0x60a9f87e 0x000d8d82\n\nPanicked task 0xffffffe19a150630: 3384 pages, 227 threads: pid 0: kernel_task\nPanicked thread: 0xffffffe19a416a00, backtrace: 0xffffffe804743700, tid: 393\n\t\t lr: 0xfffffff0131ff42c fp: 0xffffffe804743750\n\t\t lr: 0xfffffff0131ff284 fp: 0xffffffe8047437c0\n\t\t lr: 0xfffffff01332a938 fp: 0xffffffe804743890\n\t\t lr: 0xfffffff0138215fc fp: 0xffffffe8047438a0\n\t\t lr: 0xfffffff0131fefb8 fp: 0xffffffe804743c20\n\t\t lr: 0xfffffff0131fefb8 fp: 0xffffffe804743c80\n\t\t lr: 0xfffffff01421f200 fp: 0xffffffe804743ca0\n\t\t lr: 0xfffffff013a03448 fp: 0xffffffe804743cd0\n\t\t lr: 0xfffffff0139f17d8 fp: 0xffffffe804743d30\n\t\t lr: 0xfffffff0139f36d4 fp: 0xffffffe804743dc0\n\t\t lr: 0xfffffff0139f0e7c fp: 0xffffffe804743e50\n\t\t lr: 0xfffffff0138f64c4 fp: 0xffffffe804743e80\n\t\t lr: 0xfffffff01377890c fp: 0xffffffe804743ec0\n\t\t lr: 0xfffffff01377818c fp: 0xffffffe804743f00\n\t\t lr: 0xfffffff01382c5a0 fp: 0x0000000000000000\n\n"

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!!!

panic(cpu 4 caller 0xffffff801b09f6b6): [kext.kalloc.2048]: element modified after free (off:1584, val:0x0000210100000000, sz:2048, ptr:0xffffff93931dd800, prot:zero)
 1584: 0x0000210100000000
 1592: 0x0000000b00005400
 1600: 0x0000000000000009
 1608: 0x0000020300000100
 1616: 0x0000015400000154
 1624: 0x0000000100000a00
 1632: 0x000008340000041a
 1640: 0x0000000000001400
Backtrace (CPU 4), Frame : Return Address
0xffffffc14497acf0 : 0xffffff801a88e02d 
0xffffffc14497ad40 : 0xffffff801a9d48e3 
0xffffffc14497ad80 : 0xffffff801a9c4eda 
0xffffffc14497add0 : 0xffffff801a832a2f 
0xffffffc14497adf0 : 0xffffff801a88d84d 
0xffffffc14497af10 : 0xffffff801a88db43 
0xffffffc14497af80 : 0xffffff801b09d68a 

Check the updates. Apple release macOS 11.4, this issue should be fixed

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.

The problem still exists with macOS 11.4, when connect with my CalDigit USB-C Pro Dock.

panic(cpu 6 caller 0xffffff800509f846): [kext.kalloc.2048]: element modified after free (off:1672, val:0xfffffffe00000000, sz:2048, ptr:0xffffff9363ace800, prot:zero) 1672: 0xfffffffe00000000 Backtrace (CPU 6), Frame : Return Address 0xffffffb0cfbdacf0 : 0xffffff800488e0dd 0xffffffb0cfbdad40 : 0xffffff80049d4f33 0xffffffb0cfbdad80 : 0xffffff80049c552a 0xffffffb0cfbdadd0 : 0xffffff8004832a2f 0xffffffb0cfbdadf0 : 0xffffff800488d8fd 0xffffffb0cfbdaf10 : 0xffffff800488dbf3 0xffffffb0cfbdaf80 : 0xffffff800509d81a 0xffffffb0cfbdaff0 : 0xffffff800509f846 0xffffffb0cfbdb470 : 0xffffff80048ecad6 0xffffffb0cfbdb4e0 : 0xffffff800489d6bc 0xffffffb0cfbdb530 : 0xffffff8004fae4f2 0xffffffb0cfbdb550 : 0xffffff7f9ecf8fce 0xffffffb0cfbdb600 : 0xffffff7f9ecf965e 0xffffffb0cfbdb640 : 0xffffff7f9ecb9d86 0xffffffb0cfbdb660 : 0xffffff7f9f5f3e78 0xffffffb0cfbdb900 : 0xffffff7f9ecba924 0xffffffb0cfbdb930 : 0xffffff7f9f5f5074 0xffffffb0cfbdb9c0 : 0xffffff7f9f5f30f7 0xffffffb0cfbdba10 : 0xffffff7f9f5f2ee7 0xffffffb0cfbdba60 : 0xffffff7f9f5f1f99 0xffffffb0cfbdbaa0 : 0xffffff800501e13e 0xffffffb0cfbdbaf0 : 0xffffff7f9ecba5e2 0xffffffb0cfbdbb20 : 0xffffff800502837b 0xffffffb0cfbdbc80 : 0xffffff8004980961 0xffffffb0cfbdbd90 : 0xffffff800489375d 0xffffffb0cfbdbe00 : 0xffffff8004869cf5 0xffffffb0cfbdbe60 : 0xffffff8004881312 0xffffffb0cfbdbef0 : 0xffffff80049a982d 0xffffffb0cfbdbfa0 : 0xffffff8004833216 Kernel Extensions in backtrace: com.apple.iokit.IOAcceleratorFamily2(442.9)[BDA1401D-563F-3650-B616-C8073E90475B]@0xffffff7f9f5ae000->0xffffff7f9f618fff dependency: com.apple.driver.AppleMobileFileIntegrity(1.0.5)[366C7BD4-9502-3D1C-ABBE-DE9749913D0C]@0xffffff8005ec0000->0xffffff8005ed5fff dependency: com.apple.iokit.IOGraphicsFamily(585.1)[2C81B74F-C771-3643-82EC-12CD4AC5EFDB]@0xffffff7f9f72f000->0xffffff7f9f75dfff dependency: com.apple.iokit.IOPCIFamily(2.9)[99A70889-A31C-3B25-8E88-ADD3F317E4E4]@0xffffff800736a000->0xffffff8007392fff dependency: com.apple.iokit.IOReportFamily(47)[367CCAE7-DAB4-3424-B191-44044619D5CB]@0xffffff80073a1000->0xffffff80073a3fff dependency: com.apple.iokit.IOSurface(290.8.1)[8FA218E4-361C-3C8B-94F0-48434AA535A0]@0xffffff8007494000->0xffffff80074b0fff com.apple.driver.AppleIntelKBLGraphics(16.0.4)[F7BCF586-AF08-3277-9C66-04F439E684B4]@0xffffff7f9eca3000->0xffffff7f9ed5afff dependency: com.apple.iokit.IOAcceleratorFamily2(442.9)[BDA1401D-563F-3650-B616-C8073E90475B]@0xffffff7f9f5ae000->0xffffff7f9f618fff dependency: com.apple.iokit.IOGraphicsFamily(585.1)[2C81B74F-C771-3643-82EC-12CD4AC5EFDB]@0xffffff7f9f72f000->0xffffff7f9f75dfff dependency: com.apple.iokit.IOPCIFamily(2.9)[99A70889-A31C-3B25-8E88-ADD3F317E4E4]@0xffffff800736a000->0xffffff8007392fff dependency: com.apple.iokit.IOSurface(290.8.1)[8FA218E4-361C-3C8B-94F0-48434AA535A0]@0xffffff8007494000->0xffffff80074b0fff

Process name corresponding to current thread: TouchBarServer

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: 0x0000000004600000 KernelCache base: 0xffffff8004800000 Kernel slide: 0x0000000004610000 Kernel text base: 0xffffff8004810000 __HIB text base: 0xffffff8004700000 System model name: MacBookPro16,1 (Mac-E1008331FDC96864) System shutdown begun: NO Hibernation exit count: 0

Same problem for me for the last 6 months. Connecting a Dell or Belkin USB-C hub with a Dell U2718Q monitor attached (and on) make my MBP 16 2019 crash. Even switching on the Dell sometimes makes the MBP crash. I wasted hours with the Apple support. They even asked me to do a fresh install which I did and again wasted hours. Update to 11.4 didn't solve the problem.

same here. Support asked me to do a fresh install, no change. I also have a belkin USBC Thunderbold Station. Mostly will DP Cable to Monitor connected

I have a 16" 2019 MBP running Big Sur 11.4 and I'm use an HP Thunderbolt Dock G2 with my monitors connected via USB-C.

I get this all the time. Sometimes it can be all of a sudden in the middle of a session, but it is much more prevalent when I am plugging in/out of the dock. It also occurs when the laptop wakes up after being in sleep mode. I get the quick sound of the fans blowing and then it reboots. It happens way too many times. I have no other option in terms of trying other docks.

I report the error every time I get it. It has been going on since the Big Sur upgrade.

Apple, where is our support? When this issue will be resolved? The panic crash happens each day!

same issue in 11.4. well this is frustrating? Hope this can be resolved ASAP. It is crashing also every day for me..

Apple obviously doesn't fix bugs anymore but introduces new ones (like HDR video playback shows white windows on external displays). And doesn't care about it. The devices are obviously not meant to be used anymore, WLAN, Bluetooth, keyboard, screen, these are all things that should better not be used. Just like the sleep mode.

The software is too unstable, so that there are constantly problems, errors up to daily multiple kernel panics.

And instead of fixing them or at least transparently telling you that they are working on it, they just recommend you to buy new hardware or waste your life to reinstall broken software, which only frustrates you even more, because it doesn't solve any bug in Apple's software.