r0 = openat$tcp_mem(0xffffffffffffff9c, &(0x7f0000000080)='/proc/sys/net/ipv4/tcp_rmem\x00', 0x1, 0x0)
stat(&(0x7f0000001cc0)='.\x00', &(0x7f0000000140)={0x0, 0x0, 0x0, 0x0, <r1=>0x0})
setresuid(0xffffffffffffffff, r1, 0x0)
write$tcp_mem(r0, 0x0, 0x0)