After upgrading to Jenkins 2.60.2 (with git client plugin 2.5.0 and git-plugin from 3.5.1), we noticed a JGit issue whith multibranch pipeline trying to fetch the git reference matching the latest Pull Request from Bitbucket, here is the stacktrace:
[Bitbucket] Build result notified
org.eclipse.jgit.errors.MissingObjectException: Missing unknown 448a6f19a4cf288969715abf248eddd174db63a7
at org.eclipse.jgit.internal.storage.file.WindowCursor.open(WindowCursor.java:158)
at org.eclipse.jgit.lib.ObjectReader.open(ObjectReader.java:227)
at org.eclipse.jgit.revwalk.RevWalk.parseAny(RevWalk.java:859)
at org.eclipse.jgit.revwalk.RevWalk.parseCommit(RevWalk.java:772)
at hudson.plugins.git.util.RevCommitRepositoryCallback.invoke(RevCommitRepositoryCallback.java:25)
at hudson.plugins.git.util.RevCommitRepositoryCallback.invoke(RevCommitRepositoryCallback.java:13)
at org.jenkinsci.plugins.gitclient.AbstractGitAPIImpl.withRepository(AbstractGitAPIImpl.java:29)
at org.jenkinsci.plugins.gitclient.CliGitAPIImpl.withRepository(CliGitAPIImpl.java:71)
at hudson.plugins.git.GitSCM.printCommitMessageToLog(GitSCM.java:1195)
at hudson.plugins.git.GitSCM.checkout(GitSCM.java:1159)
at org.jenkinsci.plugins.workflow.steps.scm.SCMStep.checkout(SCMStep.java:113)
at org.jenkinsci.plugins.workflow.cps.CpsScmFlowDefinition.create(CpsScmFlowDefinition.java:130)
at org.jenkinsci.plugins.workflow.multibranch.SCMBinder.create(SCMBinder.java:120)
at org.jenkinsci.plugins.workflow.job.WorkflowRun.run(WorkflowRun.java:263)
at hudson.model.ResourceController.execute(ResourceController.java:97)
at hudson.model.Executor.run(Executor.java:405)
In the other and, the mentionned sha1 exists and git fsck does not report any corruption symptoms. Moreover, C-git (installed on the agent) is able to fetch this sha1.
The issue and the stacktrace we've got are too close to what was reported in the link below:
However, the fix provided right there is more for another problem with git submodules rather than PRs.