zhhyu7 opened a new pull request, #17668:
URL: https://github.com/apache/nuttx/pull/17668
## Summary
avoid crashes caused by four-byte alignment issues.
## Impact
mm/iob and net
## Testing
sim:matter with ping and iperf
test log:
```
NuttShell (NSH) NuttX-12.11.0
MOTD: username=admin password=Administrator
nsh> ifconfig eth0 10.0.1.2/24
nsh> ifconfig
eth0 Link encap:Ethernet HWaddr 42:e1:c4:3f:48:dd at RUNNING mtu 1500
inet addr:10.0.1.2 DRaddr:10.0.1.1 Mask:255.255.255.0
inet6 addr: fe80::40e1:c4ff:fe3f:48dd/64
inet6 DRaddr: ::
IPv4 IPv6 TCP UDP ICMP ICMPv6 CAN
Received 0010 0012 0000 0019 0000 0006 0000
Dropped 0000 0003 0000 0000 0000 0006 0000
IPv4 VHL: 0000 Frg: 0000
IPv6 VHL: 0000
Checksum 0000 ---- 0000 0000 ---- ---- ----
TCP ACK: 0000 SYN: 0000
RST: 0000 0000
Type 0000 0000 ---- ---- 0000 0000 ----
Sent 0000 000b 0000 0000 0000 000b 0000
Rexmit ---- ---- 0000 ---- ---- ---- ----
nsh> ping -c 3 10.0.1.1
PING 10.0.1.1 56 bytes of data
56 bytes from 10.0.1.1: icmp_seq=0 time=0.0 ms
56 bytes from 10.0.1.1: icmp_seq=1 time=0.0 ms
56 bytes from 10.0.1.1: icmp_seq=2 time=0.0 ms
3 packets transmitted, 3 received, 0% packet loss, time 3030 ms
rtt min/avg/max/mdev = 0.000/0.000/0.000/0.000 ms
nsh> iperf -c 10.0.1.1 -B 10.0.1.2
IP: 10.0.1.2
mode=tcp-client sip=10.0.1.2:5001,dip=10.0.1.1:5001, interval=3, time=30
Interval Transfer Bandwidth
0.00- 3.18 sec 207699968 Bytes 522.52 Mbits/sec
3.18- 7.50 sec 281968640 Bytes 522.16 Mbits/sec
7.50- 11.30 sec 249856000 Bytes 526.01 Mbits/sec
11.30- 17.96 sec 438517760 Bytes 526.75 Mbits/sec
17.96- 32.37 sec 940507136 Bytes 522.14 Mbits/sec
0.00- 32.37 sec 2297282560 Bytes 567.76 Mbits/sec
iperf exit
nsh> iperf -s -B 10.0.1.2
IP: 10.0.1.2
mode=tcp-server sip=10.0.1.2:5001,dip=0.0.0.0:5001, interval=3, time=0
accept: 10.0.1.1:57610
Interval Transfer Bandwidth
0.00- 3.22 sec 247189740 Bytes 614.14 Mbits/sec
3.22- 6.36 sec 230052200 Bytes 586.12 Mbits/sec
6.36- 9.77 sec 267815100 Bytes 628.31 Mbits/sec
closed by the peer: 10.0.1.1:57610
iperf exit
nsh>
```
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