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

Ditto after beta.