[logback-user] Logback 1.2.3 threads getting deadlocked

[Debraj Manna]

Filed https://jira.qos.ch/browse/LOGBACK-1421

On Wed, Sep 12, 2018 at 10:44 PM ceki <ceki at qos.ch> wrote:

> Hi Debraj,
>
> Can you please create a JiRA issue for the deadlock you describe?
> --
> Ceki Gülcü
>
>
>
> Sent from my Samsung Galaxy smartphone.
> -------- Original message --------
> From: Debraj Manna <subharaj.manna at gmail.com>
> Date: 9/12/2018 18:21 (GMT+01:00)
> To: logback-user at qos.ch
> Subject: [logback-user] Logback 1.2.3 threads getting deadlocked
>
> I am observing logback 1.2.3 getting stuck with stacktrace like below . In
> case the email gets truncated I am also placing the above logs in the below
> gist
> <https://gist.github.com/debraj-manna/d3b8de557ae3514368ab66b947d0ed14> .
>
> https://gist.github.com/debraj-manna/d3b8de557ae3514368ab66b947d0ed14
>
> I am using java 8
>
> 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)
>
> 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:
>
> "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)
>
> Loback.xml
> <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>
>
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