Install a plugin "convert job to pipeline" with option "download and install later" that throws error "CompositeIOException" while downloading and after restart all the repos under our organization is gone... And also few of the already installed plugins like "github branch source" somehow moved to "available" tab of plugin manager indicating that it got uninstalled on its own... Also when tried to re install we get same "CompositeIOException" error stating the directory cannot be removed .

 
One more point -
This error "CompositeIOException" was also observed in job's publish html report step ( we don't archive for each build) since 2.157 release on January 6th.
 
[htmlpublisher] Archiving HTML reports...
[htmlpublisher] Archiving at PROJECT level /var/lib/jenkins/workspace/WORKSPACE_NAME/reports to /var/lib/jenkins/jobs/JOB_NAME/htmlreports/*****
FATAL: HTML Publisher failure
java.io.IOException: Unable to delete '/var/lib/jenkins/jobs/JOB_NAME/htmlreports/REPORT_NAME'. Tried 3 times (of a maximum of 3) waiting 0.1 sec between attempts.
at jenkins.util.io.PathRemover.forceRemoveFile(PathRemover.java:75)
at hudson.Util.deleteFile(Util.java:255)
at hudson.FilePath.deleteRecursive(FilePath.java:1305)
at hudson.FilePath.access$1600(FilePath.java:213)
at hudson.FilePath$DeleteRecursive.invoke(FilePath.java:1274)
at hudson.FilePath$DeleteRecursive.invoke(FilePath.java:1270)
at hudson.FilePath.act(FilePath.java:1078)
at hudson.FilePath.act(FilePath.java:1061)
at hudson.FilePath.deleteRecursive(FilePath.java:1268)
at htmlpublisher.HtmlPublisher.publishReports(HtmlPublisher.java:285)
at htmlpublisher.HtmlPublisher.perform(HtmlPublisher.java:193)
at hudson.tasks.BuildStepMonitor$1.perform(BuildStepMonitor.java:20)
at hudson.model.AbstractBuild$AbstractBuildExecution.perform(AbstractBuild.java:744)
at hudson.model.AbstractBuild$AbstractBuildExecution.performAllBuildSteps(AbstractBuild.java:690)
at hudson.model.Build$BuildExecution.post2(Build.java:186)
at hudson.model.AbstractBuild$AbstractBuildExecution.post(AbstractBuild.java:635)
at hudson.model.Run.execute(Run.java:1835)
at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:43)
at hudson.model.ResourceController.execute(ResourceController.java:97)
at hudson.model.Executor.run(Executor.java:429)
Caused by: jenkins.util.io.CompositeIOException: Unable to remove directory