r0 = syz_open_procfs(0x0, &(0x7f0000000140)='projid_map\x00')
r1 = openat$tcp_mem(0xffffffffffffff9c, &(0x7f0000000000)='/proc/sys/net/ipv4/tcp_rmem\x00', 0x1, 0x0)
sendfile(r1, r0, &(0x7f0000000040)=0x100000001, 0x0)