There is a bug in my code which can be easily reproduced since a test fails.

Up to now I used git-bisect in such cases, but it is only useful if there is only one git repo.

In my case there are 7.

Is there a way to do something like git-bisect but for N git repositories?

Update

There is one "container" Repo this contains mostly config. It is related to a particular customer.

Then there is one repo for the core-application.

Then where are N repos for plugins for this core-application.

Git submodules are not used in this context.

Update2

Up to now I don't use the google repo tool. AFAIK it can't bisect, too.