[LUCENE-10665] Deadlock in AnalysisSPILoader

• Type: Bug
• Status: Patch Available
• Priority: Critical
• Resolution: Unresolved
• Lucene Fields: Patch Available
• Assignee: Unassigned
• Reporter: Jasir KT
• Created: 28/Jul/22 10:37
• Updated: 06/Dec/22 18:25

Description

Loading different TokenFilter/Tokenizer/CharFilter from different threads is causing deadlock. To reproduce use the below code:

public static void main(String[] args)

{ Thread thread1 = new Thread(UpperCaseFilterFactory::new); Thread thread2 = new Thread(LowerCaseFilterFactory::new); thread1.start(); thread2.start(); }

Took the thread dump, and found that thread1 gets stuck while calling ensureClassInitialized(LowerCaseFilterFactory) possibly because thread2 is holding some lock on the same class.