Jenkins - Another java.nio.channels.ClosedChannelException error - jenkins

Question

I have a very simple Freestyle Jenkins job running on an agent. The job just runs the following shell code
df -h
dprintout=$(df -h | grep /media/data)
tmp="${dprintout#*T *T *T }"
usage="${tmp%\%*}"
if [ "$usage" -gt "98" ]
then
echo "Disk Usage Too High!"
exit 1
fi
Around 25% of the time, the job fails, with the following error message.
[WS-CLEANUP] Deleting project workspace...
[WS-CLEANUP] Deferred wipeout is used...
FATAL: java.nio.channels.ClosedChannelException
java.nio.channels.ClosedChannelException
Also: hudson.remoting.Channel$CallSiteStackTrace: Remote call to JNLP4-connect connection from 19-49-169-6.prometheus-stack-prometheus-node-exporter.monitoring.svc.cluster.local/19.49.169.6:3929
at hudson.remoting.Channel.attachCallSiteStackTrace(Channel.java:1784)
at hudson.remoting.Request.call(Request.java:199)
at hudson.remoting.Channel.call(Channel.java:999)
at hudson.FilePath.act(FilePath.java:1186)
at hudson.FilePath.act(FilePath.java:1175)
at hudson.FilePath.exists(FilePath.java:1740)
at hudson.plugins.ws_cleanup.PreBuildCleanup.preCheckout(PreBuildCleanup.java:103)
at jenkins.scm.SCMCheckoutStrategy.preCheckout(SCMCheckoutStrategy.java:75)
at hudson.model.AbstractBuild$AbstractBuildExecution.run(AbstractBuild.java:518)
at hudson.model.Run.execute(Run.java:1899)
at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:44)
at hudson.model.ResourceController.execute(ResourceController.java:107)
at hudson.model.Executor.run(Executor.java:449)
Caused: hudson.remoting.RequestAbortedException
at hudson.remoting.Request.abort(Request.java:345)
at hudson.remoting.Channel.terminate(Channel.java:1080)
at org.jenkinsci.remoting.protocol.impl.ChannelApplicationLayer.onReadClosed(ChannelApplicationLayer.java:241)
at org.jenkinsci.remoting.protocol.ApplicationLayer.onRecvClosed(ApplicationLayer.java:221)
at org.jenkinsci.remoting.protocol.ProtocolStack$Ptr.onRecvClosed(ProtocolStack.java:825)
at org.jenkinsci.remoting.protocol.FilterLayer.onRecvClosed(FilterLayer.java:289)
at org.jenkinsci.remoting.protocol.impl.SSLEngineFilterLayer.onRecvClosed(SSLEngineFilterLayer.java:177)
at org.jenkinsci.remoting.protocol.impl.SSLEngineFilterLayer.switchToNoSecure(SSLEngineFilterLayer.java:279)
at org.jenkinsci.remoting.protocol.impl.SSLEngineFilterLayer.processWrite(SSLEngineFilterLayer.java:501)
at org.jenkinsci.remoting.protocol.impl.SSLEngineFilterLayer.processQueuedWrites(SSLEngineFilterLayer.java:244)
at org.jenkinsci.remoting.protocol.impl.SSLEngineFilterLayer.doSend(SSLEngineFilterLayer.java:196)
at org.jenkinsci.remoting.protocol.impl.SSLEngineFilterLayer.doCloseSend(SSLEngineFilterLayer.java:209)
at org.jenkinsci.remoting.protocol.ProtocolStack$Ptr.doCloseSend(ProtocolStack.java:793)
at org.jenkinsci.remoting.protocol.ApplicationLayer.doCloseWrite(ApplicationLayer.java:172)
at org.jenkinsci.remoting.protocol.impl.ChannelApplicationLayer$ByteBufferCommandTransport.closeWrite(ChannelApplicationLayer.java:343)
at hudson.remoting.Channel.close(Channel.java:1494)
at hudson.remoting.Channel.close(Channel.java:1447)
at hudson.slaves.SlaveComputer.closeChannel(SlaveComputer.java:923)
at hudson.slaves.SlaveComputer$2.run(SlaveComputer.java:803)
at jenkins.util.ContextResettingExecutorService$1.run(ContextResettingExecutorService.java:30)
at jenkins.security.ImpersonatingExecutorService$1.run(ImpersonatingExecutorService.java:70)
at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515)
at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
at java.base/java.lang.Thread.run(Thread.java:829)
Looking at the other SO tickets with the same error message, it looks like none of them applies to my situation.