r0 = openat$tcp_congestion(0xffffffffffffff9c, &(0x7f0000000000), 0x1, 0x0)
r1 = syz_open_procfs(0x0, &(0x7f0000000040)='net/ip6_tables_matches\x00')
sendfile(r0, r1, &(0x7f0000000040)=0x8, 0x38)