I attempted to duplicate this problem with various mixes of slave agents (Windows, Debian, Red Hat, CentOS) and many jobs running concurrently with a very short time to complete the job. With the current released Git plugin, there is no report of a stack trace in the user interface or in the jenkins.log file on the master.
I ran both with no other jobs on the server and with multiple high demand jobs on the server.
I ran 105 (7*15) configurations across those various platforms and load conditions.
I assume the issue is resolved and can be closed.