just got a deadlock inside HSQLDB code, in JunitTest_dbaccess_complex with few days old master. probably it's pretty obscure so not sure if it's worth fixing... jstack says: 2015-12-10 14:34:34 Full thread dump OpenJDK 64-Bit Server VM (25.65-b01 mixed mode): "Attach Listener" #278239 daemon prio=9 os_prio=0 tid=0x00000000024ac800 nid=0x2061 waiting on condition [0x0000000000000000] java.lang.Thread.State: RUNNABLE "Thread-278228" #278238 prio=5 os_prio=0 tid=0x0000000002364000 nid=0x6203 waiting for monitor entry [0x00002b2ddf2ba000] java.lang.Thread.State: BLOCKED (on object monitor) at org.hsqldb.lib.HsqlTimer$TaskQueue.signalTaskCancelled(HsqlTimer.java:926) - waiting to lock <0x00000005c9e11e98> (a org.hsqldb.lib.HsqlTimer$TaskQueue) at org.hsqldb.lib.HsqlTimer$Task.cancel(HsqlTimer.java:728) at org.hsqldb.lib.HsqlTimer$Task.setPeriod(HsqlTimer.java:803) - locked <0x000000077ebd9d78> (a org.hsqldb.lib.HsqlTimer$Task) at org.hsqldb.lib.HsqlTimer.setPeriod(HsqlTimer.java:428) at org.hsqldb.scriptio.ScriptWriterBase.setWriteDelay(ScriptWriterBase.java:418) at org.hsqldb.persist.Log.setWriteDelay(Log.java:529) at org.hsqldb.persist.Logger.setWriteDelay(Logger.java:386) - locked <0x00000005ca892608> (a org.hsqldb.persist.Logger) at org.hsqldb.DatabaseCommandInterpreter.processSet(DatabaseCommandInterpreter.java:2361) at org.hsqldb.DatabaseCommandInterpreter.executePart(DatabaseCommandInterpreter.java:308) at org.hsqldb.DatabaseCommandInterpreter.execute(DatabaseCommandInterpreter.java:170) at org.hsqldb.Session.sqlExecuteDirectNoPreChecks(Session.java:1037) - locked <0x00000005ca845200> (a org.hsqldb.Database) at org.hsqldb.Session.execute(Session.java:899) - locked <0x00000005ca845200> (a org.hsqldb.Database) at org.hsqldb.jdbc.jdbcStatement.fetchResult(jdbcStatement.java:1581) at org.hsqldb.jdbc.jdbcStatement.execute(jdbcStatement.java:628) "HSQLDB Timer @287caa38" #11 daemon prio=5 os_prio=0 tid=0x0000000002295000 nid=0x6237 waiting for monitor entry [0x00002b2e08b61000] java.lang.Thread.State: BLOCKED (on object monitor) at org.hsqldb.lib.HsqlTimer$Task.getNextScheduled(HsqlTimer.java:763) - waiting to lock <0x000000077ebd9d78> (a org.hsqldb.lib.HsqlTimer$Task) at org.hsqldb.lib.HsqlTimer.compare(HsqlTimer.java:108) at org.hsqldb.lib.HsqlArrayHeap.add(HsqlArrayHeap.java:122) - locked <0x00000005c9e11e98> (a org.hsqldb.lib.HsqlTimer$TaskQueue) at org.hsqldb.lib.HsqlTimer$TaskQueue.addTask(HsqlTimer.java:841) at org.hsqldb.lib.HsqlTimer.nextTask(HsqlTimer.java:558) at org.hsqldb.lib.HsqlTimer$TaskRunner.run(HsqlTimer.java:610) at java.lang.Thread.run(Thread.java:745) "Service Thread" #9 daemon prio=9 os_prio=0 tid=0x00000000020ac000 nid=0x6232 runnable [0x0000000000000000] java.lang.Thread.State: RUNNABLE "C1 CompilerThread3" #8 daemon prio=9 os_prio=0 tid=0x0000000002056000 nid=0x6231 waiting on condition [0x0000000000000000] java.lang.Thread.State: RUNNABLE "C2 CompilerThread2" #7 daemon prio=9 os_prio=0 tid=0x0000000002053800 nid=0x6230 waiting on condition [0x0000000000000000] java.lang.Thread.State: RUNNABLE "C2 CompilerThread1" #6 daemon prio=9 os_prio=0 tid=0x0000000002051000 nid=0x622f waiting on condition [0x0000000000000000] java.lang.Thread.State: RUNNABLE "C2 CompilerThread0" #5 daemon prio=9 os_prio=0 tid=0x0000000002043800 nid=0x622e waiting on condition [0x0000000000000000] java.lang.Thread.State: RUNNABLE "Signal Dispatcher" #4 daemon prio=9 os_prio=0 tid=0x0000000002041800 nid=0x622d runnable [0x0000000000000000] java.lang.Thread.State: RUNNABLE "Finalizer" #3 daemon prio=8 os_prio=0 tid=0x000000000200f000 nid=0x622b in Object.wait() [0x00002b2e06e41000] java.lang.Thread.State: WAITING (on object monitor) at java.lang.Object.wait(Native Method) - waiting on <0x00000005c9e3b998> (a java.lang.ref.ReferenceQueue$Lock) at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:143) - locked <0x00000005c9e3b998> (a java.lang.ref.ReferenceQueue$Lock) at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:164) at java.lang.ref.Finalizer$FinalizerThread.run(Finalizer.java:209) "Reference Handler" #2 daemon prio=10 os_prio=0 tid=0x0000000002007800 nid=0x622a in Object.wait() [0x00002b2e06640000] java.lang.Thread.State: WAITING (on object monitor) at java.lang.Object.wait(Native Method) at java.lang.Object.wait(Object.java:502) at java.lang.ref.Reference$ReferenceHandler.run(Reference.java:157) - locked <0x00000005c9e3bbb0> (a java.lang.ref.Reference$Lock) "VM Thread" os_prio=0 tid=0x0000000002002000 nid=0x6229 runnable "GC task thread#0 (ParallelGC)" os_prio=0 tid=0x0000000001f8e000 nid=0x621f runnable "GC task thread#1 (ParallelGC)" os_prio=0 tid=0x0000000001f8f800 nid=0x6220 runnable "GC task thread#2 (ParallelGC)" os_prio=0 tid=0x0000000001f91800 nid=0x6221 runnable "GC task thread#3 (ParallelGC)" os_prio=0 tid=0x0000000001f93000 nid=0x6222 runnable "GC task thread#4 (ParallelGC)" os_prio=0 tid=0x0000000001f95000 nid=0x6223 runnable "GC task thread#5 (ParallelGC)" os_prio=0 tid=0x0000000001f96800 nid=0x6224 runnable "GC task thread#6 (ParallelGC)" os_prio=0 tid=0x0000000001f98800 nid=0x6225 runnable "GC task thread#7 (ParallelGC)" os_prio=0 tid=0x0000000001f9a800 nid=0x6226 runnable "GC task thread#8 (ParallelGC)" os_prio=0 tid=0x0000000001f9c000 nid=0x6227 runnable "GC task thread#9 (ParallelGC)" os_prio=0 tid=0x0000000001f9e000 nid=0x6228 runnable "VM Periodic Task Thread" os_prio=0 tid=0x00000000020ae800 nid=0x6233 waiting on condition JNI global references: 184 Found one Java-level deadlock: ============================= "Thread-278228": waiting to lock monitor 0x000000000200d448 (object 0x00000005c9e11e98, a org.hsqldb.lib.HsqlTimer$TaskQueue), which is held by "HSQLDB Timer @287caa38" "HSQLDB Timer @287caa38": waiting to lock monitor 0x000000000200dc88 (object 0x000000077ebd9d78, a org.hsqldb.lib.HsqlTimer$Task), which is held by "Thread-278228" Java stack information for the threads listed above: =================================================== "Thread-278228": at org.hsqldb.lib.HsqlTimer$TaskQueue.signalTaskCancelled(HsqlTimer.java:926) - waiting to lock <0x00000005c9e11e98> (a org.hsqldb.lib.HsqlTimer$TaskQueue) at org.hsqldb.lib.HsqlTimer$Task.cancel(HsqlTimer.java:728) at org.hsqldb.lib.HsqlTimer$Task.setPeriod(HsqlTimer.java:803) - locked <0x000000077ebd9d78> (a org.hsqldb.lib.HsqlTimer$Task) at org.hsqldb.lib.HsqlTimer.setPeriod(HsqlTimer.java:428) at org.hsqldb.scriptio.ScriptWriterBase.setWriteDelay(ScriptWriterBase.java:418) at org.hsqldb.persist.Log.setWriteDelay(Log.java:529) at org.hsqldb.persist.Logger.setWriteDelay(Logger.java:386) - locked <0x00000005ca892608> (a org.hsqldb.persist.Logger) at org.hsqldb.DatabaseCommandInterpreter.processSet(DatabaseCommandInterpreter.java:2361) at org.hsqldb.DatabaseCommandInterpreter.executePart(DatabaseCommandInterpreter.java:308) at org.hsqldb.DatabaseCommandInterpreter.execute(DatabaseCommandInterpreter.java:170) at org.hsqldb.Session.sqlExecuteDirectNoPreChecks(Session.java:1037) - locked <0x00000005ca845200> (a org.hsqldb.Database) at org.hsqldb.Session.execute(Session.java:899) - locked <0x00000005ca845200> (a org.hsqldb.Database) at org.hsqldb.jdbc.jdbcStatement.fetchResult(jdbcStatement.java:1581) at org.hsqldb.jdbc.jdbcStatement.execute(jdbcStatement.java:628) "HSQLDB Timer @287caa38": at org.hsqldb.lib.HsqlTimer$Task.getNextScheduled(HsqlTimer.java:763) - waiting to lock <0x000000077ebd9d78> (a org.hsqldb.lib.HsqlTimer$Task) at org.hsqldb.lib.HsqlTimer.compare(HsqlTimer.java:108) at org.hsqldb.lib.HsqlArrayHeap.add(HsqlArrayHeap.java:122) - locked <0x00000005c9e11e98> (a org.hsqldb.lib.HsqlTimer$TaskQueue) at org.hsqldb.lib.HsqlTimer$TaskQueue.addTask(HsqlTimer.java:841) at org.hsqldb.lib.HsqlTimer.nextTask(HsqlTimer.java:558) at org.hsqldb.lib.HsqlTimer$TaskRunner.run(HsqlTimer.java:610) at java.lang.Thread.run(Thread.java:745) Found 1 deadlock.
Ran into that same problem during JunitTest_dbaccess_complex on <https://wiki.documentfoundation.org/Development/Tinderbox#14> now, too; <http://tinderbox.libreoffice.org/cgi-bin/gunzip.cgi?tree=MASTER&full-log=1479724201.29823>.
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