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This has nothing to do with the infrastructure. The serial console gets debug output from the journal. If you don't expect this on the serial console, I guess this is a product bug (if not configured this way in some earlier test)

coolo wrote:

If you don't expect this on the serial console, I guess this is a product bug

The problem here is that the actual output of the command doesn't contain this character at all. See output here: https://openqa.suse.de/tests/5754960#step/yast2_system_settings/50

The output of the command not, but the serial console at the same time - see /49

Ok, but isn't script_output designed to return only the command output?

Not really. it returns whatever the script outputs to the serial console - and everything else the serial console captures at the time.

And why 9 out of 10 times it doesn't capture anything out of the command output for aarch64 and 10/10 for the other architectures. This doesn't seem right to me. There is a function that is not acting in a predictable way. How should I make sure for my test that it will return only the command output?

It's not acting in a predictable way because the system in the background is not predictably generating debug output on the console.