Created attachment 128471 [details]
Output from journalctl when the crash happened
I'm on Fedora 25 and can't install anything with PackageKit. E. g.
$ pkcon install pidgin
Loading cache [=========================]
Testing changes [= ] (5%) The daemon crashed mid-transaction!
I've attached the crash dump that I can see in journalctl.
This seems like the same thing I'm seeing in https://bugzilla.redhat.com/show_bug.cgi?id=1398085
I can confirm that the same thing happens to me when I use pkcon to try to install anything on the CLI:
$ pkcon install Thunar
Testing changes [ ] (0%) The daemon crashed mid-transaction!
So probably your gnome-software is busted, too.
I'm getting the same thing, here's the gdb of the crash on Fedora 25:
Created attachment 129154 [details]
GDB session of pkcon segfaulting
Please let me know if you need anything else.
Most of the action for this issue is now over at https://bugzilla.redhat.com/show_bug.cgi?id=1398085. We should close this to centralize the information there.