Under certain circumstances, downloads performed by dnf running in a Fedora guest connected via passt will stall.
It's not entirely clear what circumstances are needed to trigger this, but it seems to have several timing dependent factors:
* Happens much more often with TCG guests than KVM guests
* Seems to require multiple concurrent download streams
* Only seems to occur with certain Fedora mirrors (possibly due to the particular bandwidth / latency to those mirrors)
I haven't seen this recently. It might well have been fixed by one of the subtle ack issues we've already fixed. Closing.