r0 = socket$inet6_udp(0xa, 0x2, 0x0)
setsockopt$inet6_IPV6_ADDRFORM(r0, 0x29, 0x4e, &(0x7f0000000340), 0x4)
r1 = socket$inet6_icmp_raw(0xa, 0x3, 0x3a)
ioctl$sock_SIOCGIFINDEX(r1, 0x8933, &(0x7f0000000140)={'syz_tun\x00', <r2=>0x0})
sendmsg$inet6(r0, &(0x7f0000000300)={&(0x7f0000000040)={0xa, 0x4e24, 0x0, @loopback={0x0, 0x300}}, 0x1c, 0x0, 0x0, &(0x7f0000000580)=[@pktinfo={{0x24, 0x29, 0x32, {@mcast2, r2}}}], 0x28}, 0x0)