[rubygems/rubygems] Add naive infinite loop detection when fixing lockfile dependencies

rubygems/rubygems@5e933968a2

Author: deivid-rodriguez

lib/bundler/definition.rb

@@ -587,10 +587,18 @@ def filter_specs(specs, deps)
     end
 
     def materialize(dependencies)
+      # Tracks potential endless loops trying to re-resolve.
+      # TODO: Remove as dead code if not reports are received in a while
+      incorrect_spec = nil
+
       specs = begin
         resolve.materialize(dependencies)
       rescue IncorrectLockfileDependencies => e
-        reresolve_without([e.spec])
+        spec = e.spec
+        raise "Infinite loop while fixing lockfile dependencies" if incorrect_spec == spec
+
+        incorrect_spec = spec
+        reresolve_without([spec])
         retry
       end