yangxin created LOG4J2-1895:
-------------------------------
Summary: Potential data race about ArrayList
Key: LOG4J2-1895
URL: https://issues.apache.org/jira/browse/LOG4J2-1895
Project: Log4j 2
Issue Type: Bug
Components: Core
Affects Versions: 2.8.1
Environment: Window10, JDK8
Reporter: yangxin
I'm doing some concurrency test about Log4j2.
Maybe there are some potential data race :
{code:xml}
Data race on field java.util.ArrayList.$state: {
Concurrent read in thread T1 (locks held: {})
at
org.apache.logging.log4j.core.appender.SyslogAppenderTestBase.checkTheNumberOfSentAndReceivedMessages(SyslogAppenderTestBase.java:111)
T1 is the main thread
Concurrent write in thread T19 (locks held: {})
at
org.apache.logging.log4j.core.net.mock.MockUdpSyslogServer.run(MockUdpSyslogServer.java:51)
T19 is created by T1
at
org.apache.logging.log4j.core.appender.SyslogAppenderTest.initUDPTestEnvironment(SyslogAppenderTest.java:95)
}
{code}
Related documents are as follows:
{code:title=SyslogAppenderTestBase.java|borderStyle=solid}
protected void checkTheNumberOfSentAndReceivedMessages() throws
InterruptedException {
assertEquals("The number of received messages should be equal with the
number of sent messages",
sentMessages.size(),
getReceivedMessages(DEFAULT_TIMEOUT_IN_MS).size());
}
{code}
{code:title=MockUdpSyslogServer.java|borderStyle=solid}
public void run() {
this.thread = Thread.currentThread();
final byte[] bytes = new byte[4096];
final DatagramPacket packet = new DatagramPacket(bytes, bytes.length);
try {
while (!shutdown) {
socket.receive(packet);
final String str = new String(packet.getData(), 0,
packet.getLength());
messageList.add(str);
}
} catch (final Exception e) {
if (!shutdown) {
Throwables.rethrow(e);
}
}
}
{code}
The following is some similar report :
{code:xml}
Data race on field java.util.ArrayList.$state: {
Concurrent read in thread T1 (locks held: {})
at
org.apache.logging.log4j.core.appender.SyslogAppenderTestBase.checkTheNumberOfSentAndReceivedMessages(SyslogAppenderTestBase.java:111)
T1 is the main thread
Concurrent write in thread T17 (locks held: {})
at
org.apache.logging.log4j.core.net.mock.MockTcpSyslogServer.run(MockTcpSyslogServer.java:59)
T17 is created by T1
at
org.apache.logging.log4j.core.appender.SyslogAppenderTest.initTCPTestEnvironment(SyslogAppenderTest.java:101)
}
{code}
{code:xml}
Data race on field java.util.ArrayList.$state: {
Concurrent read in thread T1 (locks held: {})
at
org.apache.logging.log4j.core.appender.SyslogAppenderTestBase.checkTheEqualityOfSentAndReceivedMessages(SyslogAppenderTestBase.java:118)
T1 is the main thread
Concurrent write in thread T19 (locks held: {})
at
org.apache.logging.log4j.core.net.mock.MockUdpSyslogServer.run(MockUdpSyslogServer.java:51)
T19 is created by T1
at
org.apache.logging.log4j.core.appender.SyslogAppenderTest.initUDPTestEnvironment(SyslogAppenderTest.java:95)
}
{code}
{code:xml}
Data race on field java.util.ArrayList.$state: {
Concurrent read in thread T1 (locks held: {})
at
org.apache.logging.log4j.core.appender.SyslogAppenderTestBase.checkTheEqualityOfSentAndReceivedMessages(SyslogAppenderTestBase.java:118)
T1 is the main thread
Concurrent write in thread T17 (locks held: {})
at
org.apache.logging.log4j.core.net.mock.MockTcpSyslogServer.run(MockTcpSyslogServer.java:59)
T17 is created by T1
at
org.apache.logging.log4j.core.appender.SyslogAppenderTest.initTCPTestEnvironment(SyslogAppenderTest.java:101)
}
{code}
{code:xml}
Data race on field java.util.ArrayList.$state: {
Concurrent read in thread T1 (locks held: {})
at
org.apache.logging.log4j.core.appender.SyslogAppenderTestBase.checkTheEqualityOfSentAndReceivedMessages(SyslogAppenderTestBase.java:119)
T1 is the main thread
Concurrent write in thread T19 (locks held: {})
at
org.apache.logging.log4j.core.net.mock.MockUdpSyslogServer.run(MockUdpSyslogServer.java:51)
T19 is created by T1
at
org.apache.logging.log4j.core.appender.SyslogAppenderTest.initUDPTestEnvironment(SyslogAppenderTest.java:95)
}
{code}
{code:xml}
Data race on field java.util.ArrayList.$state: {
Concurrent read in thread T1 (locks held: {})
at
org.apache.logging.log4j.core.appender.SyslogAppenderTestBase.checkTheEqualityOfSentAndReceivedMessages(SyslogAppenderTestBase.java:119)
T1 is the main thread
Concurrent write in thread T17 (locks held: {})
at
org.apache.logging.log4j.core.net.mock.MockTcpSyslogServer.run(MockTcpSyslogServer.java:59)
T17 is created by T1
at
org.apache.logging.log4j.core.appender.SyslogAppenderTest.initTCPTestEnvironment(SyslogAppenderTest.java:101)
}
{code}
{code:xml}
Data race on field java.util.ArrayList.$state: {
Concurrent read in thread T1 (locks held: {})
at
org.apache.logging.log4j.test.appender.ListAppender.getMessages(ListAppender.java:213)
T1 is the main thread
Concurrent write in thread T17 (locks held: {Monitor@63b1d4fa})
at
org.apache.logging.log4j.test.appender.ListAppender.write(ListAppender.java:173)
T17 is created by T1
at
org.apache.logging.log4j.core.appender.AsyncAppender.start(AsyncAppender.java:124)
}
{code}
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