logback / LOGBACK-1548 [Open] Race condition in the AsyncAppenderBase#Worker thread during shutdown ============================== Here's what changed in this issue in the last few minutes. This issue has been created This issue is now assigned to you. View or comment on issue using this link https://jira.qos.ch/browse/LOGBACK-1548 ============================== Issue created ------------------------------ Dmitry Kaukov created this issue on 13/Jan/21 3:11 AM Summary: Race condition in the AsyncAppenderBase#Worker thread during shutdown Issue Type: Bug Affects Versions: 1.2.3 Assignee: Logback dev list Components: logback-core Created: 13/Jan/21 3:11 AM Labels: AsyncAppender Priority: Major Reporter: Dmitry Kaukov Description: The AsyncAppenderBase#Worker thread may not clear interrupt flag here:  [https://github.com/qos-ch/logback/blob/master/logback-core/src/main/java/ch/...] (when it exits loop by parent.isStarted() condition). As a result, in our projects it fails to properly flush queue and properly stop appenders. This is what we can see in the logs: {code} 13:06:59,188 |-INFO in ch.qos.logback.classic.AsyncAppender[ASYNC-KAFKA] - Worker thread will flush remaining events before exiting. 13:06:59,189 |-ERROR in com.opentable.logging.KafkaAppender[KAFKA] - Appender [KAFKA] failed to append. org.apache.kafka.common.errors.InterruptException: java.lang.InterruptedException at org.apache.kafka.common.errors.InterruptException: java.lang.InterruptedException at at org.apache.kafka.clients.producer.KafkaProducer.doSend(KafkaProducer.java:967) at at org.apache.kafka.clients.producer.KafkaProducer.send(KafkaProducer.java:865) at at org.apache.kafka.clients.producer.KafkaProducer.send(KafkaProducer.java:752) at at com.opentable.logging.KafkaAppender.append(KafkaAppender.java:82) at at com.opentable.logging.KafkaAppender.append(KafkaAppender.java:32) at at ch.qos.logback.core.UnsynchronizedAppenderBase.doAppend(UnsynchronizedAppenderBase.java:84) at at ch.qos.logback.core.spi.AppenderAttachableImpl.appendLoopOnAppenders(AppenderAttachableImpl.java:51) at at ch.qos.logback.core.AsyncAppenderBase$Worker.run(AsyncAppenderBase.java:299) {code} ============================== This message was sent by Atlassian Jira (v8.8.0#808000-sha1:e2c7e59)