I'm unable to build using the GIT SCM. The error is:
started
Checkout (update)
Fetching upstream changes
[workspace] $ git fetch
[workspace] $ git tag -l
FATAL: Error performing git rev-parse
hudson.plugins.git.GitException: Error performing git rev-parse
at hudson.plugins.git.GitAPI.getTags(GitAPI.java:275)
at hudson.plugins.git.GitSCM.branchesThatNeedBuilding(GitSCM.java:259)
at hudson.plugins.git.GitSCM.checkout(GitSCM.java:147)
at hudson.model.AbstractProject.checkout(AbstractProject.java:666)
at hudson.model.AbstractBuild$AbstractRunner.checkout(AbstractBuild.java:261)
at hudson.model.AbstractBuild$AbstractRunner.run(AbstractBuild.java:235)
at hudson.model.Run.run(Run.java:817)
at hudson.model.Build.run(Build.java:88)
at hudson.model.ResourceController.execute(ResourceController.java:70)
at hudson.model.Executor.run(Executor.java:90)
Caused by: hudson.plugins.git.GitException: Error launching git rev-parse
at hudson.plugins.git.GitAPI.getTags(GitAPI.java:258)
... 9 more

With the tomcat user I can execute git rev-parse :

-sh-3.2$ git rev-parse --verify HEAD
c50f6f367a49ca48131ac95a97496690f9aa1584