Branch indexing was observed to hang in several threads:
"Executor #-1 for master : executing BranchIndexing[...] / waiting for ... state=TIMED_WAITING ...
- waiting on <...> (a hudson.remoting.UserRequest)
- locked <...> (a hudson.remoting.UserRequest)
at java.lang.Object.wait(Native Method)
at hudson.remoting.Request.call(Request.java:147)
at hudson.remoting.Channel.call(Channel.java:829)
at hudson.FilePath.act(FilePath.java:985)
at hudson.FilePath.act(FilePath.java:974)
at hudson.FilePath.isDirectory(FilePath.java:1507)
at jenkins.branch.WorkspaceLocatorImpl$Deleter.cleanUp(WorkspaceLocatorImpl.java:133)
at jenkins.branch.WorkspaceLocatorImpl$Deleter.onDeleted(WorkspaceLocatorImpl.java:125)
at hudson.model.listeners.ItemListener$4.apply(ItemListener.java:205)
at hudson.model.listeners.ItemListener$4.apply(ItemListener.java:203)
at hudson.model.listeners.ItemListener.forAll(ItemListener.java:167)
at hudson.model.listeners.ItemListener.fireOnDeleted(ItemListener.java:203)
at com.cloudbees.hudson.plugins.folder.AbstractFolder.onDeleted(AbstractFolder.java:1195)
at com.cloudbees.hudson.plugins.folder.AbstractFolder.onDeleted(AbstractFolder.java:149)
at hudson.model.AbstractItem.delete(AbstractItem.java:575)
at hudson.model.Job.delete(Job.java:683)
at com.cloudbees.hudson.plugins.folder.computed.ComputedFolder.updateChildren(ComputedFolder.java:277)
at com.cloudbees.hudson.plugins.folder.computed.FolderComputation.run(FolderComputation.java:162)
at jenkins.branch.MultiBranchProject$BranchIndexing.run(MultiBranchProject.java:967)
at hudson.model.ResourceController.execute(ResourceController.java:98)
at hudson.model.Executor.run(Executor.java:405)
Apparently the agent connection had gone sour, which may indicate a bug in Remoting. Regardless, I have observed cases where, say, FilePath.isDirectory just hangs indefinitely for no reason I have been able to diagnose or reproduce. The Timeout utility in Pipeline tries to work around this for specific cases, introduced for JENKINS-32986. The fix of JENKINS-34564 should be amended to perform workspace cleanup asynchronously; there is no reason to block the thread calling Job.delete (usually branch indexing; for dead branches, could potentially be an HTTP request).
Bug
Major
JENKINS-34564 Give the ability to choose how the multibranch subprojects will be named.
JENKINS-44785 Add Built-in Request timeout support in Remoting
