r0 = openat(0xffffffffffffff9c, &(0x7f0000000000)='./file1\x00', 0x882c2, 0x0)
mmap(&(0x7f0000000000/0xc00000)=nil, 0xc00000, 0x0, 0x1f012, r0, 0x0)
r1 = socket$inet6_udp(0xa, 0x2, 0x0)
r2 = fcntl$dupfd(r1, 0x0, r1)
setsockopt$inet_mreqn(r2, 0x0, 0x4, &(0x7f0000000f40)={@multicast2, @loopback}, 0xc)