Fabian Polkosnik created JENA-1873:
--------------------------------------
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$682/0x0000000801117840.apply(Unknown
Source) at
java.util.concurrent.ConcurrentHashMap.computeIfAbsent([email protected]/ConcurrentHashMap.java:1737)
- locked <0x00000006a5cdc880> (a java.util.concurrent.ConcurrentHashMap$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([email protected]/ConcurrentHashMap.java:1122)
- waiting to lock <0x00000006a5cdc880> (a
java.util.concurrent.ConcurrentHashMap$Node) at
java.util.concurrent.ConcurrentHashMap.remove([email protected]/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}
--
This message was sent by Atlassian Jira
(v8.3.4#803005)
