netsnmp: unexpected header length in /proc/net/snmp. 237 != 224

Check-list

• I did not find the issue in the existing issues
• I can reproduce the issue with unmodified Buildroot from this repository, not from a fork somewhere else
• I can reproduce the issue on the latest commit of the branch I'm using:
  • LTS (i.e. 2025.02)
• I can reproduce the issue after running make clean; make

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What happens

The version of the netsnmp package is unable to read from /pron/net/snmp after it was updated in more recent versions of the Linux kernel. The error that is produced shows systemstats_linux: unexpected header length in /proc/net/snmp. 237 != 224.

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What was expected

Proper loading of the /proc/net/snmp information without error.

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Extra information

This was a known netsnmp issue which was resolved by 786. Creating a patch and applying it resolves this for newer versions of the kernel. The latest release (5.9.4) does not contain the fix and it is currently targeted at the 5.10 release.