test-stress fails sometimes

• jsonrpc-glib 3.28.0
• Debian

I am running the build tests without parallel building as you suggested, but I'm still having problems with test-stress not passing 100% on some architectures.

Build logs are at https://buildd.debian.org/status/package.php?p=jsonrpc-glib

You can see the individual logs by clicking the text in the Status column.

I at least need all the builds in the top white area (s390x and above) to succeed since those are Debian release architectures.