panic: Data modified on freelist: word 4 of object 0xffff800001468c00 size 0x38 previous type free (0x0 != 0xdeadbeef)

Starting stack trace...
panic(ffffffff8338747a) at panic+0x1d0 sys/kern/subr_prf.c:229
malloc(38,19,1) at malloc+0xd7c sys/kern/kern_malloc.c:353
checkalias(fffffd806bdbb8a0,1762,ffff800000b49800) at checkalias+0x21c sys/kern/vfs_subr.c:602
ffs_vinit(ffff800000b49800,ffff80003c504550) at ffs_vinit+0x13d
ffs_vget(ffff800000b49800,1e1,ffff80003c504638) at ffs_vget+0x429 sys/ufs/ffs/ffs_vfsops.c:1283
ufs_lookup() at ufs_lookup+0x19f8 sys/ufs/ufs/ufs_lookup.c:478
VOP_LOOKUP(fffffd80658eb460,ffff80003c5048b8,ffff80003c5048e8) at VOP_LOOKUP+0x6e sys/kern/vfs_vops.c:85
vfs_lookup(ffff80003c504888) at vfs_lookup+0x8fa sys/kern/vfs_lookup.c:566
namei(ffff80003c504888) at namei+0x7aa sys/kern/vfs_lookup.c:250
dounlinkat(ffff8000ffff82b0,ffffff9c,400000000200,0) at dounlinkat+0xc1 sys/kern/vfs_syscalls.c:1851
syscall(ffff80003c504a60) at syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff80003c504a60) at syscall+0xb08 sys/arch/amd64/amd64/trap.c:577
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xe92db0b69b0, count: 245
End of stack trace.