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c34c9bdb62
Using this method used to result in a deadlock, as shown by these two threads "main" #1 prio=5 os_prio=0 cpu=926.39ms elapsed=21.00s tid=0x00007f463802c800 nid=0x5a691 in Object.wait() [0x00007f463f323000] java.lang.Thread.State: TIMED_WAITING (on object monitor) at java.lang.Object.wait(java.base@11.0.23/Native Method) - waiting on <0x0000000622e82fd8> (a org.jivesoftware.smack.StanzaCollector) at org.jivesoftware.smack.StanzaCollector.nextResult(StanzaCollector.java:206) - waiting to re-lock in wait() <0x0000000622e82fd8> (a org.jivesoftware.smack.StanzaCollector) at org.jivesoftware.smack.StanzaCollector.nextResultOrThrow(StanzaCollector.java:270) at org.jivesoftware.smack.StanzaCollector.nextResultOrThrow(StanzaCollector.java:228) at org.jivesoftware.smackx.muc.MultiUserChat.changeNickname(MultiUserChat.java:1314) - locked <0x0000000622e19700> (a org.jivesoftware.smackx.muc.MultiUserChat) at org.jivesoftware.smackx.muc.MultiUserChatOccupantIntegrationTest.mucChangeNicknameInformationTest(MultiUserChatOccupantIntegrationTest.java:981) at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(java.base@11.0.23/Native Method) at jdk.internal.reflect.NativeMethodAccessorImpl.invoke(java.base@11.0.23/NativeMethodAccessorImpl.java:62) at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(java.base@11.0.23/DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(java.base@11.0.23/Method.java:566) at org.igniterealtime.smack.inttest.SmackIntegrationTestFramework.lambda$runTests$0(SmackIntegrationTestFramework.java:476) at org.igniterealtime.smack.inttest.SmackIntegrationTestFramework$$Lambda$141/0x000000084026e040.execute(Unknown Source) at org.igniterealtime.smack.inttest.SmackIntegrationTestFramework.runConcreteTest(SmackIntegrationTestFramework.java:551) at org.igniterealtime.smack.inttest.SmackIntegrationTestFramework$PreparedTest.run(SmackIntegrationTestFramework.java:759) at org.igniterealtime.smack.inttest.SmackIntegrationTestFramework.runTests(SmackIntegrationTestFramework.java:539) at org.igniterealtime.smack.inttest.SmackIntegrationTestFramework.run(SmackIntegrationTestFramework.java:277) - locked <0x000000062d191318> (a org.igniterealtime.smack.inttest.SmackIntegrationTestFramework) at org.igniterealtime.smack.inttest.SmackIntegrationTestFramework.main(SmackIntegrationTestFramework.java:115) "Smack Cached Executor" #19 daemon prio=5 os_prio=0 cpu=7.85ms elapsed=20.48s tid=0x00007f4638a42800 nid=0x5a6b2 waiting for monitor entry [0x00007f46023fe000] java.lang.Thread.State: BLOCKED (on object monitor) at org.jivesoftware.smackx.muc.MultiUserChat.userHasLeft(MultiUserChat.java:2281) - waiting to lock <0x0000000622e19700> (a org.jivesoftware.smackx.muc.MultiUserChat) at org.jivesoftware.smackx.muc.MultiUserChat.access$800(MultiUserChat.java:117) at org.jivesoftware.smackx.muc.MultiUserChat$3.processStanza(MultiUserChat.java:263) at org.jivesoftware.smack.AbstractXMPPConnection.lambda$invokeStanzaCollectorsAndNotifyRecvListeners$8(AbstractXMPPConnection.java:1654) at org.jivesoftware.smack.AbstractXMPPConnection$$Lambda$127/0x000000084022f440.run(Unknown Source) at org.jivesoftware.smack.AbstractXMPPConnection$10.run(AbstractXMPPConnection.java:2213) at java.util.concurrent.ThreadPoolExecutor.runWorker(java.base@11.0.23/ThreadPoolExecutor.java:1128) at java.util.concurrent.ThreadPoolExecutor$Worker.run(java.base@11.0.23/ThreadPoolExecutor.java:628) at java.lang.Thread.run(java.base@11.0.23/Thread.java:829) The changeNickname() method was synchronized and is userHasLeft(), this caused a deadlock since changeNickname() awaits the presence that is send as result of the nickname change. But this presence is also processed in a listener which invokes userHasLeft(). However, this invocation blocks as userHasLeft() is waiting on the montior currently hold by the thread invoking changeNickname(). To fix this, we change changeNickname() to not take the MultiUserChat monitor, but instead use a dedicate lock. Fixes SMACK-942. |
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