I had upgraded my i686 systems to f27, so I could not test on f26, but
I decided to give it a try on my Athlon.
I upgraded from kernel-4.13.9-300.fc27.i686 to
kernel-4.13.5-300.fc27.i686, dnf-2.7.3-1.fc27.noarch to
dnf-2.7.5-1.fc27.noarch and rpm-4.14.0-0.rc2.3.fc27.i686 to
rpm-4.14.0-2.fc27.i686. There was no crash at any point and rpm
doesn't misbehave in any way.
In the mirrors my systems connect to, f26 is on rpm-4.13.0.2-1, while
rpm-4.13.0.1-7 was the previous version and it had been at that
version since August.
I also checked the upstream tracker and I could not find any similar
bug report - either open or closed.
Can anyone else take a look?