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Type: Bug
Resolution: Unresolved
Priority: Major
Component/s: git-plugin
Labels:
None
Environment:
jenkins 2.7.4
git-plugin 2.6.0

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We have a simple pipeline job that checks out source from git (stash) and builds it. This uses "Stash Webhook to Jenkins" commit notifications which should include a SHA1 hash. It generally works fine but occasionally the server will return http code 503 (log below) when checking out. After this, the job stops responding to commit notifications. While we have multiple nodes, this job is only running on one specific node (for performance reasons).

Running the job manually gets it out of this state but this should not be necessary. I believe that Jenkins should be resilient to transient failures like this.

> git -c core.askpass=true fetch --tags --progress https://stash/product.git +refs/heads/*:refs/remotes/origin/* # timeout=30
 > git config --local --remove-section credential # timeout=10
ERROR: Error fetching remote repo 'origin'
hudson.plugins.git.GitException: Failed to fetch from https://stash/product.git
	at hudson.plugins.git.GitSCM.fetchFrom(GitSCM.java:799)
	at hudson.plugins.git.GitSCM.retrieveChanges(GitSCM.java:1055)
	at hudson.plugins.git.GitSCM.checkout(GitSCM.java:1086)
	at org.jenkinsci.plugins.workflow.steps.scm.SCMStep.checkout(SCMStep.java:109)
	at org.jenkinsci.plugins.workflow.steps.scm.SCMStep$StepExecutionImpl.run(SCMStep.java:83)
	at org.jenkinsci.plugins.workflow.steps.scm.SCMStep$StepExecutionImpl.run(SCMStep.java:73)
	at org.jenkinsci.plugins.workflow.steps.AbstractSynchronousNonBlockingStepExecution$1$1.call(AbstractSynchronousNonBlockingStepExecution.java:52)
	at hudson.security.ACL.impersonate(ACL.java:213)
	at org.jenkinsci.plugins.workflow.steps.AbstractSynchronousNonBlockingStepExecution$1.run(AbstractSynchronousNonBlockingStepExecution.java:49)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
	at java.util.concurrent.FutureTask.run(FutureTask.java:262)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
	at java.lang.Thread.run(Thread.java:745)
Caused by: hudson.plugins.git.GitException: Command "git -c core.askpass=true fetch --tags --progress https://stash/product.git +refs/heads/*:refs/remotes/origin/*" returned status code 128:
stdout: 
stderr: fatal: unable to access 'https://stash/product.git/': Received HTTP code 503 from proxy after CONNECT

	at org.jenkinsci.plugins.gitclient.CliGitAPIImpl.launchCommandIn(CliGitAPIImpl.java:1740)
	at org.jenkinsci.plugins.gitclient.CliGitAPIImpl.launchCommandWithCredentials(CliGitAPIImpl.java:1476)
	at org.jenkinsci.plugins.gitclient.CliGitAPIImpl.access$300(CliGitAPIImpl.java:63)
	at org.jenkinsci.plugins.gitclient.CliGitAPIImpl$1.execute(CliGitAPIImpl.java:314)
	at org.jenkinsci.plugins.gitclient.RemoteGitImpl$CommandInvocationHandler$1.call(RemoteGitImpl.java:152)
	at org.jenkinsci.plugins.gitclient.RemoteGitImpl$CommandInvocationHandler$1.call(RemoteGitImpl.java:145)
	at hudson.remoting.UserRequest.perform(UserRequest.java:153)
	at hudson.remoting.UserRequest.perform(UserRequest.java:50)
	at hudson.remoting.Request$2.run(Request.java:332)
	at hudson.remoting.InterceptingExecutorService$1.call(InterceptingExecutorService.java:68)
	at java.util.concurrent.FutureTask.run(FutureTask.java:262)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
	at hudson.remoting.Engine$1$1.run(Engine.java:85)
	at java.lang.Thread.run(Thread.java:745)
	at ......remote call to jagent-lin6(Native Method)
	at hudson.remoting.Channel.attachCallSiteStackTrace(Channel.java:1416)
	at hudson.remoting.UserResponse.retrieve(UserRequest.java:253)
	at hudson.remoting.Channel.call(Channel.java:781)
	at org.jenkinsci.plugins.gitclient.RemoteGitImpl$CommandInvocationHandler.execute(RemoteGitImpl.java:145)
	at sun.reflect.GeneratedMethodAccessor572.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:606)
	at org.jenkinsci.plugins.gitclient.RemoteGitImpl$CommandInvocationHandler.invoke(RemoteGitImpl.java:131)
	at com.sun.proxy.$Proxy85.execute(Unknown Source)
	at hudson.plugins.git.GitSCM.fetchFrom(GitSCM.java:797)
	... 13 more

Our pipeline script looks something like this...:

node('specific_node') {
    stage('Check out') {
        checkout scm: [$class: 'GitSCM',
                  branches: [[name: "*/master"]],
                  doGenerateSubmoduleConfigurations: false,
                  extensions: [
                      [$class: 'CleanCheckout'],
                      [$class: 'CloneOption', reference: '', shallow: false, timeout: 30]
                  ],
                  submoduleCfg: [],
                  userRemoteConfigs: [[credentialsId: 'abcd1234',
                      url: 'https://git/product.git']]
            ]
    }
}

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