DEBRAJ MANNA created LOGBACK-1421:
-------------------------------------
Summary: Logback 1.2.3 threads getting deadlocked at
CachingDateFormatter
Key: LOGBACK-1421
URL: https://jira.qos.ch/browse/LOGBACK-1421
Project: logback
Issue Type: Bug
Components: logback-core
Affects Versions: 1.2.3
Environment: I am observing logback 1.2.3 getting stuck with
stacktrace like below
{code:java}
Schedule_CISCON9K_10.22.8.7_config_OpMgr-0" #874742 prio=5 os_prio=0
tid=0x00007fff54789000 nid=0x31f0 waiting for monitor entry [0x00007fff0e323000]
java.lang.Thread.State: BLOCKED (on object monitor)
at
ch.qos.logback.core.util.CachingDateFormatter.format(CachingDateFormatter.java:45)
- waiting to lock <0x00000006488ca358> (a
ch.qos.logback.core.util.CachingDateFormatter)
at
ch.qos.logback.classic.pattern.DateConverter.convert(DateConverter.java:61)
at
ch.qos.logback.classic.pattern.DateConverter.convert(DateConverter.java:23)
at
ch.qos.logback.core.pattern.FormattingConverter.write(FormattingConverter.java:36)
at
ch.qos.logback.core.pattern.PatternLayoutBase.writeLoopOnConverters(PatternLayoutBase.java:115)
at ch.qos.logback.classic.PatternLayout.doLayout(PatternLayout.java:141)
at ch.qos.logback.classic.PatternLayout.doLayout(PatternLayout.java:39)
at
ch.qos.logback.core.encoder.LayoutWrappingEncoder.encode(LayoutWrappingEncoder.java:115)
at
ch.qos.logback.core.OutputStreamAppender.subAppend(OutputStreamAppender.java:230)
at
ch.qos.logback.core.OutputStreamAppender.append(OutputStreamAppender.java:102)
at
ch.qos.logback.core.UnsynchronizedAppenderBase.doAppend(UnsynchronizedAppenderBase.java:84)
at
ch.qos.logback.core.spi.AppenderAttachableImpl.appendLoopOnAppenders(AppenderAttachableImpl.java:51)
at ch.qos.logback.classic.Logger.appendLoopOnAppenders(Logger.java:270)
at ch.qos.logback.classic.Logger.callAppenders(Logger.java:257)
at
ch.qos.logback.classic.Logger.buildLoggingEventAndAppend(Logger.java:421)
at ch.qos.logback.classic.Logger.filterAndLog_0_Or3Plus(Logger.java:383)
at ch.qos.logback.classic.Logger.info(Logger.java:579)
at
com.van.dataproviders.core.impl.cas.n5k.tasks.N5KSynchronousTask.doRun(N5KSynchronousTask.java:63)
at
com.van.dataproviders.core.common.impl.dataprovider.tasks.AbstractTask.run(AbstractTask.java:104)
at
com.van.dataproviders.tasker.Tasker$ScheduledTaskWrapper.run(Tasker.java:359)
at
com.google.common.util.concurrent.MoreExecutors$ScheduledListeningDecorator$NeverSuccessfulListenableFutureTask.run(MoreExecutors.java:678)
at
java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308)
at
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180)
at
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
{code}
Most thread trying to write to log are blocked on a {{synchronize(this)}} lock
in {{CachingDateFormatter}} of logback.
But another thread, which actually has the above lock (thus blocking the other
threads) is itself blocked as follows:
{code:java}
"Schedule_CISCON9K_10.22.8.149_metric_OpMgr-0" #871618 prio=5 os_prio=0
tid=0x00007fff54740800 nid=0x7e56 waiting for monitor entry [0x00007fff15f1a000]
java.lang.Thread.State: BLOCKED (on object monitor)
at java.util.ResourceBundle.getBundleImpl(ResourceBundle.java:1333)
at java.util.ResourceBundle.getBundle(ResourceBundle.java:899)
at sun.util.resources.LocaleData$1.run(LocaleData.java:167)
at sun.util.resources.LocaleData$1.run(LocaleData.java:163)
at java.security.AccessController.doPrivileged(Native Method)
at sun.util.resources.LocaleData.getBundle(LocaleData.java:163)
at sun.util.resources.LocaleData.getDateFormatData(LocaleData.java:127)
at java.text.DateFormatSymbols.initializeData(DateFormatSymbols.java:710)
at java.text.DateFormatSymbols.<init>(DateFormatSymbols.java:145)
at
sun.util.locale.provider.DateFormatSymbolsProviderImpl.getInstance(DateFormatSymbolsProviderImpl.java:85)
at
java.text.DateFormatSymbols.getProviderInstance(DateFormatSymbols.java:364)
at java.text.DateFormatSymbols.getInstance(DateFormatSymbols.java:340)
at java.util.Calendar.getDisplayName(Calendar.java:2110)
at java.text.SimpleDateFormat.subFormat(SimpleDateFormat.java:1125)
at java.text.SimpleDateFormat.format(SimpleDateFormat.java:966)
at java.text.SimpleDateFormat.format(SimpleDateFormat.java:936)
at java.text.DateFormat.format(DateFormat.java:345)
at
ch.qos.logback.core.util.CachingDateFormatter.format(CachingDateFormatter.java:48)
- locked <0x00000006488ca358> (a
ch.qos.logback.core.util.CachingDateFormatter)
at
ch.qos.logback.classic.pattern.DateConverter.convert(DateConverter.java:61)
{code}
{{logback.xml}}
{code:java}
<configuration scan="true" debug="true">
<appender name="CONSOLE" class="ch.qos.logback.core.ConsoleAppender">
<Target>System.out</Target>
<encoder>
<pattern>%p [%d{yyyy-MM-dd HH:mm:ss,SSS}] %c{3}:[%C{1}:%M:%L] -
[%t] -
%replace(%.-20480m){'[^A-Za-z0-9=<>:@/.,"\'\-\[\]\{\}\(\)\n\s!|]','_'}%n</pattern>
</encoder>
</appender>
<root level="INFO">
<appender-ref ref="CONSOLE"/>
</root>
</configuration>
{code}
Java 8
Reporter: DEBRAJ MANNA
Assignee: Logback dev list
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