Post build task recently started to generate exception, while it was working great before (upgrade to jenkins 1.449 or 1.450).

Here is the exception trace. It occurs right after "Archiving artifacts"

FATAL: Java heap space
09:36:53 java.lang.OutOfMemoryError: Java heap space
09:36:53 at java.lang.AbstractStringBuilder.<init>(AbstractStringBuilder.java:62)
09:36:53 at java.lang.StringBuilder.<init>(StringBuilder.java:97)
09:36:53 at hudson.Util.loadFile(Util.java:171)
09:36:53 at hudson.model.Run.getLog(Run.java:1562)
09:36:53 at hudson.plugins.postbuildtask.PostbuildTask.perform(PostbuildTask.java:99)
09:36:53 at hudson.tasks.BuildStepMonitor$1.perform(BuildStepMonitor.java:19)
09:36:53 at hudson.model.AbstractBuild$AbstractRunner.perform(AbstractBuild.java:700)
09:36:53 at hudson.model.AbstractBuild$AbstractRunner.performAllBuildSteps(AbstractBuild.java:675)
09:36:53 at hudson.model.AbstractBuild$AbstractRunner.performAllBuildSteps(AbstractBuild.java:653)
09:36:53 at hudson.model.Build$RunnerImpl.post2(Build.java:162)
09:36:53 at hudson.model.AbstractBuild$AbstractRunner.post(AbstractBuild.java:622)
09:36:53 at hudson.model.Run.run(Run.java:1434)
09:36:53 at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:46)
09:36:53 at hudson.model.ResourceController.execute(ResourceController.java:88)
09:36:53 at hudson.model.Executor.run(Executor.java:238)