kernel: protection fault trap, code=0
Stopped at      in6_purgeaddr+0x149:    movq    %rax,0x10(%r13)
ddb> 
ddb> set $lines = 0
ddb> set $maxwidth = 0
ddb> show panic
the kernel did not panic
ddb> trace
in6_purgeaddr(ffff800000b36300) at in6_purgeaddr+0x149 sys/netinet6/in6.c:915
in6_ifdetach(ffff800000af3800) at in6_ifdetach+0x74 sys/netinet6/in6_ifattach.c:422
if_detach(ffff800000af3800) at if_detach+0x155 sys/net/if.c:1110
tun_clone_destroy(ffff800000af3800) at tun_clone_destroy+0x1c0 sys/net/if_tun.c:278
spec_close(ffff800014f0fd30) at spec_close+0x3b0 sys/kern/spec_vnops.c:553
VOP_CLOSE(fffffd803c24bb60,7,fffffd803f7c6a80,ffff8000ffff2ee8) at VOP_CLOSE+0xc0 sys/kern/vfs_vops.c:175
vn_closefile(fffffd802d7b4888,ffff8000ffff2ee8) at vn_closefile+0xd3 vn_close sys/kern/vfs_vnops.c:289 [inline]
vn_closefile(fffffd802d7b4888,ffff8000ffff2ee8) at vn_closefile+0xd3 sys/kern/vfs_vnops.c:601
fdrop(fffffd802d7b4888,ffff8000ffff2ee8) at fdrop+0xc2 sys/kern/kern_descrip.c:1273
closef(fffffd802d7b4888,ffff8000ffff2ee8) at closef+0x118 sys/kern/kern_descrip.c:1257
fdfree(ffff8000ffff2ee8) at fdfree+0x100 sys/kern/kern_descrip.c:1189
exit1(ffff8000ffff2ee8,1,1) at exit1+0x32f sys/kern/kern_exit.c:196
postsig(ffff8000ffff2ee8,1) at postsig+0x4a6 sigexit sys/kern/kern_sig.c:1499 [inline]
postsig(ffff8000ffff2ee8,1) at postsig+0x4a6 sys/kern/kern_sig.c:1431
userret(ffff8000ffff2ee8) at userret+0x159 sys/kern/kern_sig.c:1888
syscall(ffff800014f101b0) at syscall+0x42e mi_syscall_return sys/sys/syscall_mi.h:115 [inline]
syscall(ffff800014f101b0) at syscall+0x42e sys/arch/amd64/amd64/trap.c:577
Xsyscall(6,4,0,5b,6269f,6b267f80000) at Xsyscall+0x128
end of kernel
end trace frame: 0x7f7ffffd4cc0, count: -15
ddb> show registers
rdi                                0
rsi                                0
rbp               0xffff800014f0fb90
rbx                                0
rdx                                0
rcx               0xfffffd802e41e600
rax               0xee96e8f7894c0031
r8                0xffff800000b30200
r9                               0x1
r10               0xbbe2a2e528687606
r11               0xc081cc0a6bb9606e
r12               0xffffffff81df7ec0    bpf_wakeup_cb
r13               0x7c2ee8fe89495641
r14               0xffff800000b36300
r15               0xffff800000af3800
rip               0xffffffff81b92099    in6_purgeaddr+0x149
cs                               0x8
rflags                       0x10246    __ALIGN_SIZE+0xf246
rsp               0xffff800014f0fb20
ss                              0x10
in6_purgeaddr+0x149:    movq    %rax,0x10(%r13)
ddb> serialport: VM disconnected.