failed to apply patch:
checking file net/ipv4/tcp.c
Hunk #1 FAILED at 4581.
1 out of 1 hunk FAILED
checking file net/ipv4/tcp_ipv4.c
Hunk #1 succeeded at 1246 (offset -7 lines).
Hunk #2 succeeded at 1272 (offset -7 lines).
Hunk #3 succeeded at 1294 (offset -7 lines).
Hunk #4 succeeded at 1312 (offset -7 lines).
Hunk #5 succeeded at 2315 (offset -7 lines).
checking file net/ipv4/tcp_output.c
Hunk #1 succeeded at 1091 (offset -10 lines).