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Bug
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Resolution: Fixed
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Major
A stack trace from a Jenkins instance running this plugin contained a thread blocked like this:
"Running CpsFlowExecution[Owner[...]]" #... daemon ... in Object.wait() [...]
java.lang.Thread.State: TIMED_WAITING (on object monitor)
at java.lang.Object.wait(Native Method)
at hudson.remoting.FastPipedInputStream.read(FastPipedInputStream.java:175)
- locked <...> (a [B)
at hudson.util.HeadBufferingStream.read(HeadBufferingStream.java:61)
at com.jcraft.jzlib.InflaterInputStream.fill(InflaterInputStream.java:175)
at com.jcraft.jzlib.InflaterInputStream.read(InflaterInputStream.java:106)
at org.apache.commons.compress.archivers.tar.TarArchiveInputStream.read(TarArchiveInputStream.java:614)
at java.io.InputStream.read(InputStream.java:101)
at org.apache.commons.io.IOUtils.copyLarge(IOUtils.java:1792)
at org.apache.commons.io.IOUtils.copyLarge(IOUtils.java:1769)
at org.apache.commons.io.IOUtils.copy(IOUtils.java:1744)
at hudson.util.IOUtils.copy(IOUtils.java:40)
at hudson.FilePath.readFromTar(FilePath.java:2318)
at hudson.FilePath.copyRecursiveTo(FilePath.java:2237)
at hudson.FilePath.copyRecursiveTo(FilePath.java:2141)
at hudson.FilePath.copyRecursiveTo(FilePath.java:2124)
at htmlpublisher.HtmlPublisher.publishReports(HtmlPublisher.java:258)
at htmlpublisher.workflow.PublishHTMLStepExecution.run(PublishHTMLStepExecution.java:67)
at htmlpublisher.workflow.PublishHTMLStepExecution.run(PublishHTMLStepExecution.java:43)
at org.jenkinsci.plugins.workflow.steps.AbstractSynchronousStepExecution.start(AbstractSynchronousStepExecution.java:40)
at org.jenkinsci.plugins.workflow.cps.DSL.invokeStep(DSL.java:184)
at org.jenkinsci.plugins.workflow.cps.DSL.invokeMethod(DSL.java:126)
at org.jenkinsci.plugins.workflow.cps.CpsScript.invokeMethod(CpsScript.java:108)
at ...
Steps which make network calls or do I/O or otherwise might block must not run in the CPS thread.
- links to
[JENKINS-40447] PublishHTMLStepExecution.run can block CPS thread
Ryan Campbell
added a comment - Released as htmlpublisher-1.12 
Richard Bywater
added a comment - jglick rather than try and recreate to confirm this is actually fixed, are you able to confirm that this is indeed resolved? Just tidying up old issues and want to close out any which I can.
Richard Bywater
added a comment - jglick rather than try and recreate to confirm this is actually fixed, are you able to confirm that this is indeed resolved? Just tidying up old issues and want to close out any which I can. I never attempted to reproduce. Just saw something incorrect in the code with a straightforward fix, and wrote the patch accordingly.
Richard Bywater
added a comment - In that case closing the issue - thanks! 
Code changed in jenkins
User: Jesse Glick
Path:
pom.xml
src/main/java/htmlpublisher/HtmlPublisher.java
src/main/java/htmlpublisher/HtmlPublisherTarget.java
src/main/java/htmlpublisher/workflow/PublishHTMLStepExecution.java
src/main/resources/htmlpublisher/HtmlPublisher/config.jelly
src/main/resources/htmlpublisher/HtmlPublisherTarget/HTMLAction/sidepanel.jelly
src/main/resources/htmlpublisher/HtmlPublisherTarget/HTMLBuildAction/sidepanel.jelly
src/main/resources/index.jelly
http://jenkins-ci.org/commit/htmlpublisher-plugin/f2a4519bc47a4b1f9cedc37affb9d5be65122213
Log:
[FIXED JENKINS-40447] Use AbstractSynchronousNonBlockingStepExecution, which requires updating to 1.609.x.