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Bug
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Resolution: Unresolved
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Major
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None
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CentOS 7.4 host
java-8-openjdk-amd64
jenkins/jenkins:lts docker image
JENKINS_VERSION 2.121.2
lockable-resources 2.3
full plugin list:
ace-editor 1.1 true
ant 1.8 true
antisamy-markup-formatter 1.5 true
apache-httpcomponents-client-4-api 4.5.5-3.0 true
authentication-tokens 1.3 true
bouncycastle-api 2.16.3 true
branch-api 2.0.20 true
build-timeout 1.19 true
cloudbees-folder 6.5.1 true
command-launcher 1.2 true
credentials 2.1.17 true
credentials-binding 1.16 true
display-url-api 2.2.0 true
docker-commons 1.13 true
docker-workflow 1.17 true
durable-task 1.22 true
email-ext 2.62 true
git 3.9.1 true
git-client 2.7.2 true
git-server 1.7 true
github 1.29.2 true
github-api 1.92 true
github-branch-source 2.3.6 true
gradle 1.29 true
handlebars 1.1.1 true
jackson2-api 2.8.11.3 true
jdk-tool 1.1 true
jquery-detached 1.2.1 true
jsch 0.1.54.2 true
junit 1.24 true
ldap 1.20 true
lockable-resources 2.3 true
mailer 1.21 true
mapdb-api 1.0.9.0 true
matrix-auth 2.3 true
matrix-project 1.13 true
momentjs 1.1.1 true
pam-auth 1.3 true
pipeline-build-step 2.7 true
pipeline-github-lib 1.0 true
pipeline-graph-analysis 1.7 true
pipeline-input-step 2.8 true
pipeline-milestone-step 1.3.1 true
pipeline-model-api 1.3.1 true
pipeline-model-declarative-agent 1.1.1 true
pipeline-model-definition 1.3.1 true
pipeline-model-extensions 1.3.1 true
pipeline-rest-api 2.10 true
pipeline-stage-step 2.3 true
pipeline-stage-tags-metadata 1.3.1 true
pipeline-stage-view 2.10 true
plain-credentials 1.4 true
resource-disposer 0.11 true
scm-api 2.2.7 true
script-security 1.44 true
ssh-credentials 1.14 true
ssh-slaves 1.26 true
structs 1.14 true
subversion 2.11.1 true
throttle-concurrents 2.0.1 true
timestamper 1.8.10 true
token-macro 2.5 true
workflow-aggregator 2.5 true
workflow-api 2.28 true
workflow-basic-steps 2.9 true
workflow-cps 2.54 true
workflow-cps-global-lib 2.9 true
workflow-durable-task-step 2.19 true
workflow-job 2.23 true
workflow-multibranch 2.20 true
workflow-scm-step 2.6 true
workflow-step-api 2.16 true
workflow-support 2.19 true
ws-cleanup 0.34 true
CentOS 7.4 host java-8-openjdk-amd64 jenkins/jenkins:lts docker image JENKINS_VERSION 2.121.2 lockable-resources 2.3 full plugin list: ace-editor 1.1 true ant 1.8 true antisamy-markup-formatter 1.5 true apache-httpcomponents-client-4-api 4.5.5-3.0 true authentication-tokens 1.3 true bouncycastle-api 2.16.3 true branch-api 2.0.20 true build-timeout 1.19 true cloudbees-folder 6.5.1 true command-launcher 1.2 true credentials 2.1.17 true credentials-binding 1.16 true display-url-api 2.2.0 true docker-commons 1.13 true docker-workflow 1.17 true durable-task 1.22 true email-ext 2.62 true git 3.9.1 true git-client 2.7.2 true git-server 1.7 true github 1.29.2 true github-api 1.92 true github-branch-source 2.3.6 true gradle 1.29 true handlebars 1.1.1 true jackson2-api 2.8.11.3 true jdk-tool 1.1 true jquery-detached 1.2.1 true jsch 0.1.54.2 true junit 1.24 true ldap 1.20 true lockable-resources 2.3 true mailer 1.21 true mapdb-api 1.0.9.0 true matrix-auth 2.3 true matrix-project 1.13 true momentjs 1.1.1 true pam-auth 1.3 true pipeline-build-step 2.7 true pipeline-github-lib 1.0 true pipeline-graph-analysis 1.7 true pipeline-input-step 2.8 true pipeline-milestone-step 1.3.1 true pipeline-model-api 1.3.1 true pipeline-model-declarative-agent 1.1.1 true pipeline-model-definition 1.3.1 true pipeline-model-extensions 1.3.1 true pipeline-rest-api 2.10 true pipeline-stage-step 2.3 true pipeline-stage-tags-metadata 1.3.1 true pipeline-stage-view 2.10 true plain-credentials 1.4 true resource-disposer 0.11 true scm-api 2.2.7 true script-security 1.44 true ssh-credentials 1.14 true ssh-slaves 1.26 true structs 1.14 true subversion 2.11.1 true throttle-concurrents 2.0.1 true timestamper 1.8.10 true token-macro 2.5 true workflow-aggregator 2.5 true workflow-api 2.28 true workflow-basic-steps 2.9 true workflow-cps 2.54 true workflow-cps-global-lib 2.9 true workflow-durable-task-step 2.19 true workflow-job 2.23 true workflow-multibranch 2.20 true workflow-scm-step 2.6 true workflow-step-api 2.16 true workflow-support 2.19 true ws-cleanup 0.34 true
The lock step can obtain a null resource after saving a global system configuration by clicking on "Manage Jenkins" -> "Configure System" -> "Save". The bug occurs irregardless of any actual changes has been made.
steps to reproduce
setup
- 4 jobs with the following configuration:
node { boolean retry = true; while (retry) { lock(label: 'res1', quantity: 1, variable: 'RES_NAME') { println env.RES_NAME if ("${env.RES_NAME}" != "null") { retry = false; sleep(100) } } } } - 2 resources configured "r1" and "r2", both with label "res1"
- 4 executors.
Steps
- Activate a build for each of the jobs simultaneously. 2 of the builds will obtain a lock and then proceed to sleep. 2 of the builds will be blocked waiting for a resource.
- Update the system configuration by clicking on "Manage Jenkins" -> "Configure System" -> "Save"
- One of the blocked build will obtain a "null" resource and re-trying a lock will obtain a resource that is already being used by one of the sleeping build. Demonstrated by the following snippet of the console output:
Running on Jenkins in /var/jenkins_home/workspace/test4@2
[Pipeline] {
[Pipeline] lock
Trying to acquire lock on [Label: res1, Quantity: 1]
Found 0 available resource(s). Waiting for correct amount: 1.
[Label: res1, Quantity: 1] is locked, waiting...
Lock acquired on [Label: res1, Quantity: 1]
[Pipeline] {
[Pipeline] echo
null
[Pipeline] }
Lock released on resource [Label: res1, Quantity: 1]
[Pipeline] // lock
[Pipeline] lock
Trying to acquire lock on [Label: res1, Quantity: 1]
Lock acquired on [Label: res1, Quantity: 1]
[Pipeline] {
[Pipeline] echo
r1
[Pipeline] sleep
Sleeping for 1 min 40 sec[Pipeline] }
Lock released on resource [Label: res1, Quantity: 1]
[Pipeline] // lock
[Pipeline] }
[Pipeline] // node
[Pipeline] End of Pipeline