I have been encountering this problem in my Macbook Pro 16" i7 and it was really frustrating. I would like to share that it never happen again after I upgraded to OSX Monterey. I can now connect my Macbook and it works fine, regardless if it is sleeping or not. Monterey is still not released officially but the beta is beta available for developer & public preview. If you dont want to go unofficial, just hold tight and sooner, this thread will be closed (hopefully).

After reading the thread, I saw someone mentioned that the issue could probably occur when connecting the usb-c dock while the laptop is on sleep. Since yesterday, I open the lid of my macbook and wait for it to wakeup before I connect the cable. I only do this when my macbook is on sleep, usually every morning. I have not encountered the problem again. Hopefully...

I have been encountering this issue for like 3 months already. It's good to see a dedicated thread for this but too bad it's still an issue and we're already in page 7. I am using my 2019 Macbook Pro 16" at Big Sur 11.5 panic(cpu 2 caller 0xffffff801749a9b6): [kext.kalloc.2048]: element modified after free (off:1672, val:0xfffffffe00000000, sz:2048, ptr:0xffffff9373558000, prot:zero) 1672: 0xfffffffe00000000 Backtrace (CPU 2), Frame : Return Address 0xffffffb0e5f4a550 : 0xffffff8016c8915d 0xffffffb0e5f4a5a0 : 0xffffff8016dd0033 0xffffffb0e5f4a5e0 : 0xffffff8016dc062a 0xffffffb0e5f4a630 : 0xffffff8016c2da2f 0xffffffb0e5f4a650 : 0xffffff8016c8897d 0xffffffb0e5f4a770 : 0xffffff8016c88c73 0xffffffb0e5f4a7e0 : 0xffffff801749898a 0xffffffb0e5f4a850 : 0xffffff801749a9b6 0xffffffb0e5f4acd0 : 0xffffff8016ce7b56 0xffffffb0e5f4ad40 : 0xffffff8016c9873c 0xffffffb0e5f4ad90 : 0xffffff80173a95f2 0xffffffb0e5f4adb0 : 0xffffff8019d5a41c 0xffffffb0e5f4add0 : 0xffffff8019d683fc 0xffffffb0e5f4ae30 : 0xffffff8019d5ab6e 0xffffffb0e5f4aed0 : 0xffffff8019d5cce7 0xffffffb0e5f4b180 : 0xffffff8019d60b7d 0xffffffb0e5f4b450 : 0xffffff8019d7023f 0xffffffb0e5f4b640 : 0xffffff8019d560b4 0xffffffb0e5f4b9e0 : 0xffffff8019d56abf 0xffffffb0e5f4ba40 : 0xffffff801747c4a6 0xffffffb0e5f4ba80 : 0xffffff8016f5144e 0xffffffb0e5f4bd50 : 0xffffff8016f32e43 0xffffffb0e5f4bf40 : 0xffffff801733ad9e 0xffffffb0e5f4bfa0 : 0xffffff8016c2e1f6 Kernel Extensions in backtrace: com.apple.security.sandbox(300.0)[1D016FA0-09CF-3D63-A613-57B7A8AA640C]@0xffffff8019d49000->0xffffff8019d8efff dependency: com.apple.driver.AppleMobileFileIntegrity(1.0.5)[F5BC1EC5-40C5-36E6-8F25-BA1DFE57654A]@0xffffff80182c0000->0xffffff80182d5fff dependency: com.apple.iokit.IOStorageFamily(2.1)[3DE94082-367D-3255-9BE7-7F5A87838247]@0xffffff801986e000->0xffffff801987ffff dependency: com.apple.kext.AppleMatch(1.0.0d1)[87BEAD84-D39B-36F5-9703-26D5D48C188D]@0xffffff80182bc000->0xffffff80182befff Process name corresponding to current thread: NotificationCenter 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: 0x0000000016a00000 KernelCache base: 0xffffff8016c00000 Kernel slide: 0x0000000016a10000 Kernel text base: 0xffffff8016c10000 __HIB text base: 0xffffff8016b00000 System model name: MacBookPro16,1 (Mac-E1008331FDC96864) System shutdown begun: NO Hibernation exit count: 11