[JIRA] (JENKINS-62181) Remoting deadlock when launching remote agent

['bart.heup...@gmail.com (JIRA)' via Jenkins Issues]

Title: Message Title

Bart Heupers created an issue   Jenkins / JENKINS-62181 Remoting deadlock when launching remote agent Issue Type: Bug Assignee: Jeff Thompson Attachments: jenkins-remoting-deadlock.log Components: remoting Created: 2020-05-06 18:42 Environment: Jenkins 2.231 Remoting version 4.3 Manifest-Version: 1.0 Application-Name: Jenkins Remoting Agent Permissions: all-permissions Codebase: * Trusted-Library: true Build-Jdk-Spec: 1.8 Version: 4.3 Created-By: Maven Jar Plugin 3.2.0 Main-Class: hudson.remoting.Launcher Labels: deadlock Priority: Critical Reporter: Bart Heupers After launching an agent it keeps hangin with the follwing text :   [05/06/20 20:34:24] [SSH] Starting agent process: cd "/var/lib/jenkins" && java -jar remoting.jar -workDir /var/lib/jenkins May 06, 2020 8:34:25 PM org.jenkinsci.remoting.engine.WorkDirManager initializeWorkDir INFO: Using /var/lib/jenkins/remoting as a remoting work directory May 06, 2020 8:34:25 PM org.jenkinsci.remoting.engine.WorkDirManager setupLogging INFO: Both error and output logs will be printed to /var/lib/jenkins/remoting <===[JENKINS REMOTING CAPACITY]===>channel started Remoting version: 4.3 This is a Unix agent   jstack reports a deadlock in attachment :   Found one Java-level deadlock: ============================= "pool-1-thread-4 for channel id=17236": waiting to lock monitor 0x00007fbd8c015bc8 (object 0x000000076e658428, a hudson.slaves.SlaveComputer$SlaveInitializer$1), which is held by "Channel reader thread: channel" "Channel reader thread: channel": waiting to lock monitor 0x00007fbd9401aed8 (object 0x000000076ded1cc8, a hudson.remoting.RemoteClassLoader), which is held by "pool-1-thread-4 for channel id=17236"   On april 3 2020 in commit https://github.com/jenkinsci/jenkins/commit/3262d8b7cfbdd1a2e026ad34644e0f9607f5724d   a new synchronized  method was added that is partly the cause of this deadlock .See line 1026 in main/java/hudson/slaves/SlaveComputer.java        Add Comment   This message was sent by Atlassian Jira (v7.13.12#713012-sha1:6e07c38) -- You received this message because you are subscribed to the Google Groups "Jenkins Issues" group. To unsubscribe from this group and stop receiving emails from it, send an email to jenkinsci-issues+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/jenkinsci-issues/JIRA.206113.1588790553000.22820.1588790580211%40Atlassian.JIRA.