Sonarlint plugin unusable due to CPU usage (one full core) due to permanent "Synchronizing projects"

Please provide

  • Operating system: ubuntu 22

  • SonarQube for IntelliJ plugin version: 10.22.0.81244

  • IntelliJ version: IntelliJ IDEA 2025.1.1 (Ultimate Edition)
    Build #IU-251.25410.109, built on May 7, 2025
    Source revision: 1710087d23ac7
    Licensed to Dynatrace Sp. z o.o. / Thomas Klambauer
    Subscription is active until October 31, 2025.
    Runtime version: 21.0.6+9-b895.109 amd64 (JCEF 122.1.9)
    VM: OpenJDK 64-Bit Server VM by JetBrains s.r.o.
    Toolkit: sun.awt.X11.XToolkit
    Linux 6.8.0-59-generic
    Ubuntu 22.04.5 LTS; glibc: 2.35
    Kotlin plugin: K2 mode
    GC: G1 Young Generation, G1 Concurrent GC, G1 Old Generation
    Memory: 13000M
    Cores: 16
    Registry:
    vcs.log.index.enable=true
    ide.experimental.ui=true
    jvm.dfa.analysis.ui.security.analysis.window.was.shown=true
    terminal.new.ui=true
    Non-Bundled Plugins:
    com.dynatrace.intellijplugin.owners (0.5.5)
    org.intellij.plugins.hcl (251.25410.59)
    VisualVMLauncher (1.23.1-IJ2023.3)
    CheckStyle-IDEA (5.105.0)
    org.jetbrains.plugins.github (251.25410.123-IU)
    com.dynatrace.intellij-plugin (1.3.0-251)
    org.sonarlint.idea (10.22.0.81244)
    Kotlin: 251.25410.109-IJ
    Current Desktop: ubuntu:GNOME

  • Programming language you’re coding in: java

  • Is connected mode used: sonarqube server

    • SonarQube Cloud, SonarQube Server, or SonarQube Community Build? (if one of the latter two, which version?): * Community Edition
  • v9.9.8 (build 100196)

And a thorough description of the problem / question:

for ~30 minutes (doesn’t seem to end), I have slow IDE and high CPU usage (like 1 out of 8 cores).

on the verbose output in the log tab I see permanently:

[2025-05-12T16:24:20.775] [sonarlint-branch-matcher] DEBUG sonarlint - Matching Sonar project branch
 [2025-05-12T16:24:20.776] [sonarlint-branch-matcher] DEBUG sonarlint - Matching Sonar project branch

thousands of entries.

and when it’s done, it’s starting right over, looks like this in the log:

 [2025-05-12T17:01:42.422] [sonarlint-branch-matcher] DEBUG sonarlint - Matching Sonar project branch
 [2025-05-12T17:01:42.56] [SonarLint Local Storage Synchronizer] INFO sonarlint - [SYNC] Synchronizing issues for project 'GROUP:PROJECT' on branch 'master'
 [2025-05-12T17:01:42.783] [SonarLint Local Storage Synchronizer] DEBUG sonarlint - GET 200 https://SERVER_URL/api/issues/pull?projectKey=GROUP%3APROJECT&branchName=master&languages=css,web,java,js,kotlin,php,py,ruby,scala,secrets,swift,ts,xml,yaml,cloudformation,docker,kubernetes,terraform,ansible&changedSince=1747061761676 | response time=223ms
 [2025-05-12T17:01:42.783] [SonarLint Local Storage Synchronizer] DEBUG sonarlint - Pulled issues in 223ms
 [2025-05-12T17:01:42.791] [SonarLint Local Storage Synchronizer] DEBUG sonarlint - Merged 0 issues in store. Closed 0. | took 7ms
 [2025-05-12T17:01:42.791] [SonarLint Local Storage Synchronizer] INFO sonarlint - [SYNC] Synchronizing taint issues for project 'GROUP:PROJECT' on branch 'master'
 [2025-05-12T17:01:42.817] [SonarLint Local Storage Synchronizer] DEBUG sonarlint - GET 200 https://SERVER_URL/api/issues/pull_taint?projectKey=GROUP%3APROJECT&branchName=master&languages=css,web,java,js,kotlin,php,py,ruby,scala,secrets,swift,ts,xml,yaml,cloudformation,docker,kubernetes,terraform,ansible&changedSince=1747061761775 | response time=24ms
 [2025-05-12T17:01:42.817] [SonarLint Local Storage Synchronizer] DEBUG sonarlint - Pulled taint issues in 24ms
 [2025-05-12T17:01:42.818] [SonarLint Local Storage Synchronizer] DEBUG sonarlint - Merged 0 taint issues in store. Closed 0. | took 0ms
 [2025-05-12T17:01:42.818] [SonarLint Local Storage Synchronizer] DEBUG sonarlint - Incremental hotspot sync is not supported. Skipping.
 [2025-05-12T17:01:42.818] [SonarLint Local Storage Synchronizer] DEBUG sonarlint - isReadyForAnalysis(connectionId: https://SERVER_URL, sonarProjectKey: GROUP:PROJECT, plugins: true, analyzer config: true, findings: true) => true
Did synchronize config scopes [PROJECT.server.openpipeline-sdlcevents.slowUnitTest]
 [2025-05-12T17:01:42.818] [SonarLint Local Storage Synchronizer] DEBUG sonarlint - Synchronizing storage of connection 'https://SERVER_URL'
 [2025-05-12T17:01:42.838] [SonarLint Local Storage Synchronizer] DEBUG sonarlint - GET 200 https://SERVER_URL/api/system/status | response time=19ms
 [2025-05-12T17:01:42.838] [SonarLint Local Storage Synchronizer] DEBUG sonarlint - Downloaded server infos in 19ms
 [2025-05-12T17:01:42.859] [SonarLint Local Storage Synchronizer] DEBUG sonarlint - GET 200 https://SERVER_URL/api/system/status | response time=20ms
 [2025-05-12T17:01:42.859] [SonarLint Local Storage Synchronizer] DEBUG sonarlint - Downloaded server infos in 20ms
 [2025-05-12T17:01:42.859] [SonarLint Local Storage Synchronizer] DEBUG sonarlint - Storing server info in /home/thomas/.cache/JetBrains/IntelliJIdea2025.1/sonarlint/storage/68747470733a2f2f636c75737465722d736f6e6172717562652e63692e64796e616c6162732e696f/server_info.pb
 [2025-05-12T17:01:42.859] [SonarLint Local Storage Synchronizer] DEBUG sonarlint - Stored server info
 [2025-05-12T17:01:42.88] [SonarLint Local Storage Synchronizer] DEBUG sonarlint - GET 200 https://SERVER_URL/api/plugins/installed | response time=20ms
 [2025-05-12T17:01:42.88] [SonarLint Local Storage Synchronizer] INFO sonarlint - Downloaded plugin list in 20ms
 [2025-05-12T17:01:42.88] [SonarLint Local Storage Synchronizer] DEBUG sonarlint - [SYNC] Code analyzer 'csharp' does not support SonarLint. Skip downloading it.
 [2025-05-12T17:01:42.88] [SonarLint Local Storage Synchronizer] DEBUG sonarlint - [SYNC] Code analyzer 'cxx' does not support SonarLint. Skip downloading it.
 [2025-05-12T17:01:42.88] [SonarLint Local Storage Synchronizer] DEBUG sonarlint - [SYNC] Code analyzer 'communityBranchPlugin' does not support SonarLint. Skip downloading it.
 [2025-05-12T17:01:42.88] [SonarLint Local Storage Synchronizer] DEBUG sonarlint - [SYNC] Code analyzer 'config' does not support SonarLint. Skip downloading it.
 [2025-05-12T17:01:42.88] [SonarLint Local Storage Synchronizer] DEBUG sonarlint - [SYNC] Code analyzer 'flex' does not support SonarLint. Skip downloading it.
 [2025-05-12T17:01:42.88] [SonarLint Local Storage Synchronizer] DEBUG sonarlint - [SYNC] Code analyzer 'go' is embedded in SonarLint. Skip downloading it.
 [2025-05-12T17:01:42.88] [SonarLint Local Storage Synchronizer] DEBUG sonarlint - [SYNC] Code analyzer 'web' is embedded in SonarLint. Skip downloading it.
 [2025-05-12T17:01:42.88] [SonarLint Local Storage Synchronizer] DEBUG sonarlint - [SYNC] Code analyzer 'iac' is embedded in SonarLint. Skip downloading it.
 [2025-05-12T17:01:42.88] [SonarLint Local Storage Synchronizer] DEBUG sonarlint - [SYNC] Code analyzer 'jacoco' does not support SonarLint. Skip downloading it.
 [2025-05-12T17:01:42.88] [SonarLint Local Storage Synchronizer] DEBUG sonarlint - [SYNC] Code analyzer 'java' is up-to-date. Skip downloading it.
 [2025-05-12T17:01:42.88] [SonarLint Local Storage Synchronizer] DEBUG sonarlint - [SYNC] Code analyzer 'javascript' is embedded in SonarLint. Skip downloading it.
 [2025-05-12T17:01:42.88] [SonarLint Local Storage Synchronizer] DEBUG sonarlint - [SYNC] Code analyzer 'kotlin' is embedded in SonarLint. Skip downloading it.
 [2025-05-12T17:01:42.88] [SonarLint Local Storage Synchronizer] DEBUG sonarlint - [SYNC] Code analyzer 'php' is up-to-date. Skip downloading it.
 [2025-05-12T17:01:42.88] [SonarLint Local Storage Synchronizer] DEBUG sonarlint - [SYNC] Code analyzer 'python' is up-to-date. Skip downloading it.
 [2025-05-12T17:01:42.88] [SonarLint Local Storage Synchronizer] DEBUG sonarlint - [SYNC] Code analyzer 'ruby' is embedded in SonarLint. Skip downloading it.
 [2025-05-12T17:01:42.88] [SonarLint Local Storage Synchronizer] DEBUG sonarlint - [SYNC] Code analyzer 'sonarscala' is up-to-date. Skip downloading it.
 [2025-05-12T17:01:42.88] [SonarLint Local Storage Synchronizer] DEBUG sonarlint - [SYNC] Code analyzer 'text' is embedded in SonarLint. Skip downloading it.
 [2025-05-12T17:01:42.88] [SonarLint Local Storage Synchronizer] DEBUG sonarlint - [SYNC] Code analyzer 'vbnet' does not support SonarLint. Skip downloading it.
 [2025-05-12T17:01:42.88] [SonarLint Local Storage Synchronizer] DEBUG sonarlint - [SYNC] Code analyzer 'xml' is embedded in SonarLint. Skip downloading it.
 [2025-05-12T17:01:42.88] [SonarLint Local Storage Synchronizer] DEBUG sonarlint - Known plugin paths: [/home/thomas/.cache/JetBrains/IntelliJIdea2025.1/sonarlint/storage/68747470733a2f2f636c75737465722d736f6e6172717562652e63692e64796e616c6162732e696f/plugins/sonar-php-plugin-3.27.1.9352.jar, /home/thomas/.cache/JetBrains/IntelliJIdea2025.1/sonarlint/storage/68747470733a2f2f636c75737465722d736f6e6172717562652e63692e64796e616c6162732e696f/plugins/sonar-scala-plugin-1.11.0.3905.jar, /home/thomas/.cache/JetBrains/IntelliJIdea2025.1/sonarlint/storage/68747470733a2f2f636c75737465722d736f6e6172717562652e63692e64796e616c6162732e696f/plugins/sonar-java-plugin-7.16.0.30901.jar, /home/thomas/.cache/JetBrains/IntelliJIdea2025.1/sonarlint/storage/68747470733a2f2f636c75737465722d736f6e6172717562652e63692e64796e616c6162732e696f/plugins/sonar-python-plugin-3.24.1.11916.jar]
 [2025-05-12T17:01:42.88] [SonarLint Local Storage Synchronizer] DEBUG sonarlint - Paths in dir: [/home/thomas/.cache/JetBrains/IntelliJIdea2025.1/sonarlint/storage/68747470733a2f2f636c75737465722d736f6e6172717562652e63692e64796e616c6162732e696f/plugins/sonar-python-plugin-3.24.1.11916.jar, /home/thomas/.cache/JetBrains/IntelliJIdea2025.1/sonarlint/storage/68747470733a2f2f636c75737465722d736f6e6172717562652e63692e64796e616c6162732e696f/plugins/plugin_references.pb, /home/thomas/.cache/JetBrains/IntelliJIdea2025.1/sonarlint/storage/68747470733a2f2f636c75737465722d736f6e6172717562652e63692e64796e616c6162732e696f/plugins/sonar-scala-plugin-1.11.0.3905.jar, /home/thomas/.cache/JetBrains/IntelliJIdea2025.1/sonarlint/storage/68747470733a2f2f636c75737465722d736f6e6172717562652e63692e64796e616c6162732e696f/plugins/sonar-java-plugin-7.16.0.30901.jar, /home/thomas/.cache/JetBrains/IntelliJIdea2025.1/sonarlint/storage/68747470733a2f2f636c75737465722d736f6e6172717562652e63692e64796e616c6162732e696f/plugins/sonar-php-plugin-3.27.1.9352.jar]
 [2025-05-12T17:01:42.88] [SonarLint Local Storage Synchronizer] DEBUG sonarlint - Unknown files: []
 [2025-05-12T17:01:42.88] [SonarLint Local Storage Synchronizer] DEBUG sonarlint - Synchronizing storage of Sonar project 'GROUP:PROJECT' for connection 'https://SERVER_URL'
 [2025-05-12T17:01:42.88] [SonarLint Local Storage Synchronizer] INFO sonarlint - [SYNC] Synchronizing analyzer configuration for project 'GROUP:PROJECT'
 [2025-05-12T17:01:42.88] [SonarLint Local Storage Synchronizer] INFO sonarlint - [SYNC] Languages enabled for synchronization: [kubernetes, css, scala, kotlin, js, py, secrets, ruby, docker, ansible, java, web, xml, php, terraform, cloudformation, swift, ts, yaml]
 [2025-05-12T17:01:42.921] [SonarLint Local Storage Synchronizer] DEBUG sonarlint - GET 200 https://SERVER_URL/api/settings/values.protobuf?component=GROUP%3APROJECT | response time=40ms
 [2025-05-12T17:01:42.922] [SonarLint Local Storage Synchronizer] INFO sonarlint - Downloaded settings in 40ms
 [2025-05-12T17:01:42.979] [SonarLint Local Storage Synchronizer] DEBUG sonarlint - GET 200 https://SERVER_URL/api/qualityprofiles/search.protobuf?project=GROUP%3APROJECT | response time=57ms
 [2025-05-12T17:01:42.979] [SonarLint Local Storage Synchronizer] DEBUG sonarlint - Downloaded project quality profiles in 57ms
 [2025-05-12T17:01:42.979] [SonarLint Local Storage Synchronizer] INFO sonarlint - [SYNC] Active rules for 'cloudformation' are up-to-date
 [2025-05-12T17:01:42.979] [SonarLint Local Storage Synchronizer] INFO sonarlint - [SYNC] Active rules for 'css' are up-to-date
 [2025-05-12T17:01:42.979] [SonarLint Local Storage Synchronizer] INFO sonarlint - [SYNC] Active rules for 'docker' are up-to-date
 [2025-05-12T17:01:42.979] [SonarLint Local Storage Synchronizer] INFO sonarlint - [SYNC] Active rules for 'java' are up-to-date

UI mini status shows permanent “Synchronizing projects”.

we have a huge project with >500 gradles modules with multiple configurations.

with intellij CPU profiling, the plugin seems to run thousands of instances of “org.sonarlint.intellij.git.GitRepo.electBestMatchingServerBranchForCurrentHead(String, Set)” (per gradle module?) when indeed all the gradle modules are only in one repo and one git server and one branch.


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