After reverting git-plugin to 1.1.26 everything is back to normal here. The change was introduced in git 1.1.27, 1.1.28 was just a minor bugfix.

Thank you Björn, I did not step back in git-plugin versions so I missed this one, sorry.

The git plugin beats me again

I've managed to fix the incompatibility, and in the process I happened to fix the changelog issue in GT as well.
But that introduced an infinite loop between the git plugin and Mailer in core when the culprits are being calculated at the end of the build.
From the looks of it it does not have to do with my changes, but I need to dive into it more before I let it loose in the wild.

https://wiki.jenkins-ci.org/display/JENKINS/Git+Plugin claims this is fixed in 1.1.29.

I probably need to do some changes in the Gerrit Trigger as well, because the current code assumes that the IGitApi reference is something else (by casting it) so that it can do some log parsing. And with the new git api implementation that assumption is wrong.

The infinite loop could be: https://issues.jenkins-ci.org/browse/JENKINS-16849

Yes that looks very similar.

Code changed in jenkins
User: rsandell
Path:
gerrithudsontrigger/pom.xml
gerrithudsontrigger/src/main/java/com/sonyericsson/hudson/plugins/gerrit/trigger/hudsontrigger/GerritTriggerBuildChooser.java
http://jenkins-ci.org/commit/gerrit-trigger-plugin/65271af7819f62d258ec1cadd70434129bf299c9
Log:
Fix For JENKINS-16851

It is probably fixed in git plugin v. 1.1.29
this commit should remove any use of deprecated APIs.
But when I test this I gen something very similar to
JENKINS-16849 at the end of the build.

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Code changed in jenkins
User: Robert Sandell
Path:
gerrithudsontrigger/pom.xml
gerrithudsontrigger/src/main/java/com/sonyericsson/hudson/plugins/gerrit/trigger/hudsontrigger/GerritTriggerBuildChooser.java
http://jenkins-ci.org/commit/gerrit-trigger-plugin/155ab6790a33b6f0b229976a40f5ee5f64d1ce22
Log:
Removed use of deprecated APIs for git BuildChooser

Followup fix for JENKINS-16851 which is fixed in git plugin v. 1.2.0
this commit should remove any use of deprecated APIs after the
introduction of gitclient plugin.

Change-Id: Ibaa11fe9e06150555af675aae1a32f29cb15aab3

Released in
Git Plugin 1.2.0
Gerrit Trigger Plugin 2.8.0