I get the same issue on Dell WD19TB docking station on Macbook pro 16 inch running Big Sur 11.4 No workaround so far panic(cpu 2 caller 0xffffff8016a9f846): [kext.kalloc.2048]: element modified after free (off:1672, val:0xfffffffe00000000, sz:2048, ptr:0xffffff937493b800, prot:zero) 1672: 0xfffffffe00000000 Backtrace (CPU 2), Frame : Return Address 0xffffffb0e1c5acf0 : 0xffffff801628e0dd 0xffffffb0e1c5ad40 : 0xffffff80163d4f33 0xffffffb0e1c5ad80 : 0xffffff80163c552a 0xffffffb0e1c5add0 : 0xffffff8016232a2f 0xffffffb0e1c5adf0 : 0xffffff801628d8fd 0xffffffb0e1c5af10 : 0xffffff801628dbf3 0xffffffb0e1c5af80 : 0xffffff8016a9d81a 0xffffffb0e1c5aff0 : 0xffffff8016a9f846 0xffffffb0e1c5b470 : 0xffffff80162ecad6 0xffffffb0e1c5b4e0 : 0xffffff801629d6bc 0xffffffb0e1c5b530 : 0xffffff80169ae4f2 0xffffffb0e1c5b550 : 0xffffff7fb06f8fce 0xffffffb0e1c5b600 : 0xffffff7fb06f965e 0xffffffb0e1c5b640 : 0xffffff7fb06b9d86 0xffffffb0e1c5b660 : 0xffffff7fb0ff3e78 0xffffffb0e1c5b900 : 0xffffff7fb06ba924 0xffffffb0e1c5b930 : 0xffffff7fb0ff5074 0xffffffb0e1c5b9c0 : 0xffffff7fb0ff30f7 0xffffffb0e1c5ba10 : 0xffffff7fb0ff2ee7 0xffffffb0e1c5ba60 : 0xffffff7fb0ff1f99 0xffffffb0e1c5baa0 : 0xffffff8016a1e13e 0xffffffb0e1c5baf0 : 0xffffff7fb06ba5e2 0xffffffb0e1c5bb20 : 0xffffff8016a2837b 0xffffffb0e1c5bc80 : 0xffffff8016380961 0xffffffb0e1c5bd90 : 0xffffff801629375d 0xffffffb0e1c5be00 : 0xffffff8016269cf5 0xffffffb0e1c5be60 : 0xffffff8016281312 0xffffffb0e1c5bef0 : 0xffffff80163a982d 0xffffffb0e1c5bfa0 : 0xffffff8016233216 Kernel Extensions in backtrace: com.apple.iokit.IOAcceleratorFamily2(442.9)[BDA1401D-563F-3650-B616-C8073E90475B]@0xffffff7fb0fae000->0xffffff7fb1018fff dependency: com.apple.driver.AppleMobileFileIntegrity(1.0.5)[366C7BD4-9502-3D1C-ABBE-DE9749913D0C]@0xffffff80178c0000->0xffffff80178d5fff dependency: com.apple.iokit.IOGraphicsFamily(585.1)[2C81B74F-C771-3643-82EC-12CD4AC5EFDB]@0xffffff7fb112f000->0xffffff7fb115dfff dependency: com.apple.iokit.IOPCIFamily(2.9)[99A70889-A31C-3B25-8E88-ADD3F317E4E4]@0xffffff8018d6a000->0xffffff8018d92fff dependency: com.apple.iokit.IOReportFamily(47)[367CCAE7-DAB4-3424-B191-44044619D5CB]@0xffffff8018da1000->0xffffff8018da3fff dependency: com.apple.iokit.IOSurface(290.8.1)[8FA218E4-361C-3C8B-94F0-48434AA535A0]@0xffffff8018e94000->0xffffff8018eb0fff com.apple.driver.AppleIntelKBLGraphics(16.0.4)[F7BCF586-AF08-3277-9C66-04F439E684B4]@0xffffff7fb06a3000->0xffffff7fb075afff dependency: com.apple.iokit.IOAcceleratorFamily2(442.9)[BDA1401D-563F-3650-B616-C8073E90475B]@0xffffff7fb0fae000->0xffffff7fb1018fff dependency: com.apple.iokit.IOGraphicsFamily(585.1)[2C81B74F-C771-3643-82EC-12CD4AC5EFDB]@0xffffff7fb112f000->0xffffff7fb115dfff dependency: com.apple.iokit.IOPCIFamily(2.9)[99A70889-A31C-3B25-8E88-ADD3F317E4E4]@0xffffff8018d6a000->0xffffff8018d92fff dependency: com.apple.iokit.IOSurface(290.8.1)[8FA218E4-361C-3C8B-94F0-48434AA535A0]@0xffffff8018e94000->0xffffff8018eb0fff Process name corresponding to current thread: TouchBarServer 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: 0x0000000016000000 KernelCache base: 0xffffff8016200000 Kernel slide: 0x0000000016010000 Kernel text base: 0xffffff8016210000 __HIB text base: 0xffffff8016100000 System model name: MacBookPro16,1 (Mac-E1008331FDC96864) System shutdown begun: NO Hibernation exit count: 20 System uptime in nanoseconds: 73757520514384 Last Sleep: absolute base_tsc base_nano Uptime : 0x0000431502cf50a0 Sleep : 0x000040654b0930dd 0x0000570283f01b4a 0x00004058bc1cc29a Wake : 0x0000406587fda601 0x00005f776a0abd50 0x00004065674dd451 last started kext at 70335722390424: >!AWWANSupport1 4.0.0 (addr 0xffffff7fb11c2000, size 20480) last stopped kext at 71105444164574: >AudioAUUC 1.70 (addr 0xffffff7fb0e20000, size 12288)