r0 = openat$tcp_mem(0xffffffffffffff9c, &(0x7f00000000c0)='/proc/sys/net/ipv4/tcp_rmem\x00', 0x1, 0x0)
ioctl$FS_IOC_RESVSP(r0, 0x40305828, &(0x7f0000000400)={0x0, 0x0, 0x0, 0x8})