https://buildd.debian.org/status/logs.php?pkg=gcc-mingw-w64&ver=26.1&arch=s390x&suite=sid
The way the logs are cut might indicate that zani has 37 GB diskspace that are exhausted? I've failed the package for now, please verify whether this is really a diskspace issue and then either fix it on the buildd or submit an RC bug against the package. Thanks Adrian