Actually, ever since Big Sur came along, Kernel panics have been back. I have several iMacPros that have been crashing, and my new M1 Macbook also crashes regularly. Strangely, only my Xeon based and M1 based machines appear to be affected.
As you can see from the trace, this is happening in the core crypto libraries. I asked a contact at Apple what do do about this and got the advice "to turn off Time Machine for the time being.". Ugh.
So yes, Apple's software has gone shoddier and shoddier over the past several years where we are now at the point that they have kernel bugs that just crash machines on a daily basis...
panic(cpu 3 caller 0xfffffe001bb88be0): "Zone element 0xfffffe232bb31e00 was modified after free for zone kext.kalloc.512: " "Expected element to be cleared"
Debugger message: panic
Memory ID: 0x6
OS release type: User
OS version: 20D91
Kernel version: Darwin Kernel Version 20.3.0: Thu Jan 21 00:06:51 PST 2021; root:xnu-7195.81.3~1/RELEASE_ARM64_T8101
Fileset Kernelcache UUID:
Kernel UUID:
iBoot version: iBoot-6723.81.1
secure boot?: YES
Paniclog version: 13
KernelCache slide: 0x00000000137a0000
KernelCache base: 0xfffffe001a7a4000
Kernel slide: 0x00000000142d4000
Kernel text base: 0xfffffe001b2d8000
Kernel text exec base: 0xfffffe001b3a0000
mach_absolute_time: 0x4ab49caf16b
Epoch Time: sec usec
Boot : 0x605062bd 0x00065f29
Sleep : 0x00000000 0x00000000
Wake : 0x00000000 0x00000000
Calendar: 0x6053a645 0x00001281
CORE 0 recently retired instr at 0xfffffe001b50ac0c
CORE 1 recently retired instr at 0xfffffe001b50ac0c
CORE 2 recently retired instr at 0xfffffe001b50ac0c
CORE 3 recently retired instr at 0xfffffe001b509748
CORE 4 recently retired instr at 0xfffffe001b50ac10
CORE 5 recently retired instr at 0xfffffe001b50ac10
CORE 6 recently retired instr at 0xfffffe001b50ac10
CORE 7 recently retired instr at 0xfffffe001b50ac10
Panicked task 0xfffffe168cf558e0: 1937 pages, 4 threads: pid 6349: diskimages-helpe
Panicked thread: 0xfffffe1690d2ccb0, backtrace: 0xfffffe3fed74ab10, tid: 2507239
lr: 0xfffffe001b3edfd0 fp: 0xfffffe3fed74ab80
lr: 0xfffffe001b3edd9c fp: 0xfffffe3fed74abf0
lr: 0xfffffe001b50ff0c fp: 0xfffffe3fed74ac10
lr: 0xfffffe001b5018b8 fp: 0xfffffe3fed74acc0
lr: 0xfffffe001b3a77e8 fp: 0xfffffe3fed74acd0
lr: 0xfffffe001b3eda2c fp: 0xfffffe3fed74b060
lr: 0xfffffe001b3eda2c fp: 0xfffffe3fed74b0d0
lr: 0xfffffe001bb8865c fp: 0xfffffe3fed74b0f0
lr: 0xfffffe001bb88be0 fp: 0xfffffe3fed74b120
lr: 0xfffffe001b4459f4 fp: 0xfffffe3fed74b160
lr: 0xfffffe001b448a38 fp: 0xfffffe3fed74b1a0
lr: 0xfffffe001b446c44 fp: 0xfffffe3fed74b200
lr: 0xfffffe001b3fc788 fp: 0xfffffe3fed74b250
lr: 0xfffffe001b8de6d0 fp: 0xfffffe3fed74b280
lr: 0xfffffe001e16cc98 fp: 0xfffffe3fed74b350
lr: 0xfffffe001e175cbc fp: 0xfffffe3fed74b410
lr: 0xfffffe001e174c6c fp: 0xfffffe3fed74bab0
lr: 0xfffffe001e174a58 fp: 0xfffffe3fed74bb10
lr: 0xfffffe001e176000 fp: 0xfffffe3fed74bb60
lr: 0xfffffe001e14b44c fp: 0xfffffe3fed74bbe0
lr: 0xfffffe001b65a470 fp: 0xfffffe3fed74bca0
lr: 0xfffffe001b90e8b4 fp: 0xfffffe3fed74bd50
lr: 0xfffffe001b90ea28 fp: 0xfffffe3fed74bdb0
lr: 0xfffffe001b9ea7ac fp: 0xfffffe3fed74be40
lr: 0xfffffe001b50159c fp: 0xfffffe3fed74bef0
lr: 0xfffffe001b3a77e8 fp: 0xfffffe3fed74bf00
Kernel Extensions in backtrace:
com.apple.filesystems.smbfs(3.4.1)[BED81F26-6A18-34A4-A477-51B1AFF95D32]@0xfffffe001e12c000->0xfffffe001e187fff
dependency: com.apple.kec.corecrypto(11.1)[E7263606-770E-3C0F-B5A1-F10042B34365]@0xfffffe001e074000->0xfffffe001e0bffff
dependency: com.apple.kext.triggers(1.0)[47F2D40F-1C2E-3C3A-AC5C-4DED90380B6D]@0xfffffe001e194000->0xfffffe001e197fff