panic: Data modified on freelist: word 4 of object 0xffff800000e18200 size 0x177 previous type free (0x6563 != 0xdeadbeef)

Starting stack trace...
panic(ffffffff82875831) at panic+0x159 sys/kern/subr_prf.c:229
malloc(177,7f,1) at malloc+0xa85 sys/kern/kern_malloc.c:348
ktrgenio(ffff80002a5c7548,7,0,ffff800000e1dec0,16f) at ktrgenio+0x12e sys/kern/kern_ktrace.c:243
dofilereadv(ffff80002a5c7548,7,ffff80002a5f79f8,0,ffff80002a5f7ab0) at dofilereadv+0x2e4 sys/kern/sys_generic.c:263
sys_read(ffff80002a5c7548,ffff80002a5f7b60,ffff80002a5f7ab0) at sys_read+0x87 sys/kern/sys_generic.c:167
syscall(ffff80002a5f7b60) at syscall+0x751 sys/arch/amd64/amd64/trap.c:577
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x7d2a20c2c6a0, count: 250
End of stack trace.