@lsedlar I got these by running above commands

$ fedpkg clone fedpkg
Cloning into 'fedpkg'...
remote: Counting objects: 199, done.
remote: Compressing objects: 100% (196/196), done.
remote: Total 199 (delta 75), reused 0 (delta 0)
Receiving objects: 100% (199/199), 28.94 KiB | 0 bytes/s, done.
Resolving deltas: 100% (75/75), done.
Checking connectivity... done.
$ cd fedpkg
$ git remote remove fedpkg
error: Could not remove config section 'remote.fedpkg'
$ fedpkg --dist master verrel
fedpkg-1.25-1.fc26

Is there any other steps needed to reproduce?

Sorry, that's my mistake: it should remove remote origin:

git remote remove origin

Each time when call this method, self._module_name will always be None, and subsequent code will not run.

Before this change, output is

Failed to get module name from Git url or pushurl
Failed to get module name from Git url or pushurl
...
Failed to get module name from Git url or pushurl
Failed to get module name from Git url or pushurl
Exception RuntimeError: RuntimeError('maximum recursion depth exceeded in __instancecheck__',) in  ignored
Exception RuntimeError: RuntimeError('maximum recursion depth exceeded in __instancecheck__',) in  ignored
Exception RuntimeError: RuntimeError('maximum recursion depth exceeded in __instancecheck__',) in  ignored
Failed to get module name from Git url or pushurl
/etc/koji/s390-config
/etc/koji/s390-config
...
/etc/koji/s390-config
/etc/koji/s390-config
libica-2.6.2-1.fc26

With this patch, for example,

fedpkg clone libica
cd libica 
git remote remove origin
fedpkg --dist master verrel

output is

Failed to get module name from Git url or pushurl
libica-2.6.2-1.fc26

Sorry, I'm not sure from your last comment if you would like to see some changes.

@lsedlar Is this still valid?

I guess this is not valid anymore, I can't replicate the issue with current fedpkg.