Updated from 1.280 to 1.285. Now, always get this error on all builds that run
on slaves that have Findbugs enabled:

[FINDBUGS] Collecting findbugs analysis files...
[FINDBUGS] A total of 101 annotations have been found for priority HIGH
[FINDBUGS] A total of 1602 annotations have been found for priority NORMAL
[FINDBUGS] A total of 0 annotations have been found for priority LOW
FATAL: Bad file descriptor
java.io.IOException: Bad file descriptor
at java.io.FileOutputStream.writeBytes(Native Method)
at java.io.FileOutputStream.write(FileOutputStream.java:247)
at org.apache.commons.io.IOUtils.write(IOUtils.java:784)
at
hudson.plugins.findbugs.util.HealthAwarePublisher.copyFilesFromSlaveToMaster(HealthAwarePublisher.java:231)
at
hudson.plugins.findbugs.util.HealthAwarePublisher.perform(HealthAwarePublisher.java:182)
at
hudson.model.AbstractBuild$AbstractRunner.performAllBuildStep(AbstractBuild.java:365)
at
hudson.model.AbstractBuild$AbstractRunner.performAllBuildStep(AbstractBuild.java:353)
at hudson.model.Build$RunnerImpl.post2(Build.java:169)
at hudson.model.AbstractBuild$AbstractRunner.post(AbstractBuild.java:338)
at hudson.model.Run.run(Run.java:914)
at hudson.model.Build.run(Build.java:112)
at hudson.model.ResourceController.execute(ResourceController.java:93)
at hudson.model.Executor.run(Executor.java:119)

Have had to back level to 1.280 for now