Description:

After upgrading the Jenkins P4 plugin from 1.17.2 to 1.17.3, sync operations fail on large binary files with the following error:
 
 
 P4JAVA: Error(s): file <path>.psd operating system write error: invalid stored block lengths
Steps to reproduce:

1. Install P4 Jenkins plugin 1.17.3
2. Configure a job with Forced clean and sync
3. Sync a depot containing large binary+l files (PSD files, ~47MB-576MB)
4. Build fails consistently on the same files across multiple agents

Findings:

• p4 verify -q on affected files returns clean — depot is not corrupt
• p4 sync via native command line client succeeds on the same files with no errors
• Downgrading to plugin 1.17.2 resolves the issue immediately
• Problem is isolated to P4Java's decompression handling of binary+l files
• Parallel sync was disabled — issue persists regardless

Conclusion:

The P4Java upgrade to 2025.2.2917314 introduced a regression in decompression of large binary files. Native p4 handles these files correctly, confirming the issue is specific to P4Java.

Workaround: Downgrade to P4 Jenkins plugin 1.17.2