[jira] [Created] (JENA-1873) Deadlock issue

["Fabian Polkosnik (Jira)" <ji...@apache.org>]

Fabian Polkosnik created JENA-1873:
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             Summary: Deadlock issue
                 Key: JENA-1873
                 URL: https://issues.apache.org/jira/browse/JENA-1873
             Project: Apache Jena
          Issue Type: Bug
          Components: Jena, TDB
    Affects Versions: Jena 3.14.0
            Reporter: Fabian Polkosnik


It is possible to face a deadlock issue when 3 threads are running in parallel.It is possible to face a deadlock issue when 3 threads are running in parallel.


One of the threads is creating a new TDB dataset. The other two are deleting existing ones. It's resulting in the 3 thread cycle deadlock.

Here are the stacktraces of 3 threads that are causing the problem.
{code:java}
"qtp1726434078-492": at org.apache.jena.tdb.sys.TDBInternal.releaseDSG(TDBInternal.java:194) - waiting to lock <0x000000069a6524a0> (a java.lang.Class for org.apache.jena.tdb.sys.TDBInternal) at org.apache.jena.tdb.StoreConnection.expel(StoreConnection.java:214) - locked <0x000000069a4568c0> (a java.lang.Class for org.apache.jena.tdb.StoreConnection) at org.apache.jena.tdb.StoreConnection.release(StoreConnection.java:202) - locked <0x000000069a4568c0> (a java.lang.Class for org.apache.jena.tdb.StoreConnection) at org.topbraid.tdb.TDBGraphs.removeSingleTDB(TDBGraphs.java:167) at org.topbraid.tdb.TDBGraphs.lambda$5(TDBGraphs.java:152) at org.topbraid.tdb.TDBGraphs$$Lambda$677/0x00000008010e2840.run(Unknown Source) at org.topbraid.tdb.TDBGraphs.destroy(TDBGraphs.java:92){code}
{code:java}
"qtp1726434078-151": at org.apache.jena.tdb.StoreConnection.make(StoreConnection.java:240) - waiting to lock <0x000000069a4568c0> (a java.lang.Class for org.apache.jena.tdb.StoreConnection) at org.apache.jena.tdb.StoreConnection.make(StoreConnection.java:258) at org.apache.jena.tdb.transaction.DatasetGraphTransaction.<init>(DatasetGraphTransaction.java:69) at org.apache.jena.tdb.sys.TDBMaker.createDirect(TDBMaker.java:126) at org.apache.jena.tdb.sys.TDBMaker$$Lambda$682/0x0000000801117840.apply(Unknown Source) at java.util.concurrent.ConcurrentHashMap.computeIfAbsent(java.base@11.0.4/ConcurrentHashMap.java:1737) - locked <0x00000006a5cdc880> (a java.util.concurrent.ConcurrentHashMap$Node) at org.apache.jena.tdb.sys.TDBMaker._create(TDBMaker.java:112) at org.apache.jena.tdb.sys.TDBMaker.createDatasetGraphTransaction(TDBMaker.java:43){code}
{code:java}
"qtp1726434078-95": at java.util.concurrent.ConcurrentHashMap.replaceNode(java.base@11.0.4/ConcurrentHashMap.java:1122) - waiting to lock <0x00000006a5cdc880> (a java.util.concurrent.ConcurrentHashMap$Node) at java.util.concurrent.ConcurrentHashMap.remove(java.base@11.0.4/ConcurrentHashMap.java:1102) at org.apache.jena.tdb.sys.TDBMaker.uncache(TDBMaker.java:88) at org.apache.jena.tdb.sys.TDBInternal.releaseDSG(TDBInternal.java:194) - locked <0x000000069a6524a0> (a java.lang.Class for org.apache.jena.tdb.sys.TDBInternal) at org.topbraid.tdb.TDBGraphs.removeSingleTDB(TDBGraphs.java:166) at org.topbraid.tdb.TDBGraphs.lambda$5(TDBGraphs.java:152) at org.topbraid.tdb.TDBGraphs$$Lambda$677/0x00000008010e2840.run(Unknown Source) at org.topbraid.tdb.TDBGraphs.destroy(TDBGraphs.java:92){code}



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