iotests failing on gitlab CI check-system-fedora job

[Peter Maydell]

The check-system-fedora job in the gitlab CI seems to have
started reliably failing on iotests 040 041 127 256 267:
 https://gitlab.com/qemu-project/qemu/-/jobs/1106977551

Could somebody have a look at what's happening, please?
(This is probably a regression that's got into master because
I stopped using "did gitlab CI pass" as a gate because gitlab
was running massively too slowly to be usable for that.)

thanks
-- PMM