Thank you for your input so far. All the alternatives seem to work-around the issue but not fulfill our needs.

We have debugged a little using gdb. We noticed that the value of msg->rcv->bind_address->address_str is correct before calling do_action. Afterwards, it is wrong.

Before:

s = "172.20.21.3"
len = 11

After:

s = "217.116.120.247"
len = 11 (sic!)

We took a closer look (step by step) and the problem seems to be using ip_addr2a. It returns a pointer to a local static char[]. This is assigned to the original struct of address_str inside of parsing_hepv3_message.

Later, when ip_addr2a is called again for xlog, then the same address is used again and hence the value of address_str.s is overwriten.

A quick look at the git history for the functions did not show any relevant changes to my untrained eyes.

As the jump from 5.1/5.4 (debian jessie) to 5.5/5.8 (debian bookworm) is kind of huge, maybe this is related to changes in the compiler?

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