Comment 5 for bug 1893040

I remember we had these "ECDSA verification failure" issues in older QEMU versions, but these were fixed.

I just tired building the go file under Fedora 32 running under latest upstream qemu-system-s390x, and using latest go binaries from https://golang.org/dl/:

[root@atomic-00 hello]# uname -a
Linux atomic-00 5.8.11-200.fc32.s390x #1 SMP Wed Sep 23 13:36:15 UTC 2020 s390x s390x s390x GNU/Linux

[root@atomic-00 hello]# go version
go version go1.15.7 linux/s390x

[root@atomic-00 hello]# go build
go: downloading rsc.io/quote v1.5.2
go: downloading rsc.io/sampler v1.3.0
go: downloading golang.org/x/text v0.0.0-20170915032832-14c0d48ead0c

[root@atomic-00 hello]# ./hello
Hello, world.

Can you double check that you are really using latest upstream QEMU in your more-advanced cross-build?