https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=250363
Bug ID: 250363
Summary: [tcp] data in syn_ack should be ignored
Product: Base System
Version: Unspecified
Hardware: Any
OS: Any
Status: New
Severity: Affects Some People
Priority: ---
Component: kern
Assignee: [email protected]
Reporter: [email protected]
data in syn_ack should be ignored as the following packetdrill script shows:
```
0.000 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3
0.000 fcntl(3, F_GETFL) = 0x2 (flags O_RDWR)
0.000 fcntl(3, F_SETFL, O_RDWR|O_NONBLOCK) = 0
// Establish connection and verify that there was no error.
0.100 connect(3, ..., ...) = -1
0.100 > S 0:0(0) <...>
+0.1 < S. 1:513(512) ack 1 win 19712
// f-stack/FreeBSD ack 513, Linux ack 1
+0.1 > . 1:1(0) ack 1
```
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