r0 = openat$tcp_congestion(0xffffffffffffff9c, &(0x7f0000000000), 0x1, 0x0)
r1 = openat$procfs(0xffffffffffffff9c, &(0x7f0000000040)='/proc/cgroups\x00', 0x0, 0x0)
sendfile(r0, r1, 0x0, 0x62c)