panic: Data modified on freelist: word 4 of object 0xffff800000ea5500 size 0x88 previous type free (0x0 != 0xdeafbead)

Starting stack trace...
panic(ffffffff828bb014) at panic+0x16f sys/kern/subr_prf.c:229
malloc(88,7b,1) at malloc+0xa4b sys/kern/kern_malloc.c:348
ip6_pcbopt(2e,fffffd806884db20,14,fffffd807acc1a60,80,6) at ip6_pcbopt+0x69 sys/netinet6/ip6_output.c:1676
sosetopt(ffff800000ea6270,29,2e,fffffd806884db00) at sosetopt+0xe1
sys_setsockopt(ffff80002a20dc50,ffff80002d6980e0,ffff80002d698030) at sys_setsockopt+0x1d7 sys/kern/uipc_syscalls.c:1231
syscall(ffff80002d6980e0) at syscall+0x8cf mi_syscall sys/sys/syscall_mi.h:180 [inline]
syscall(ffff80002d6980e0) at syscall+0x8cf sys/arch/amd64/amd64/trap.c:577
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x47af2612af0, count: 250
End of stack trace.