[logback-user] Logback Lock causing the app to lock up

[Ceki Gulcu]

Can you please post your configuration file as well?

On 4/11/2016 19:59, Greg Nitro wrote:
> Hi,
>
> We are using Logback 1.1.3, and observed through jstack that quite a few
> threads were blocked in OutputStreamAppender.subAppend waiting to obtain
> the lock.
>
> This is a Play Framework app running in a dockerized environment,
> configured to log to STDOUT and papertrail.
>
> Stack trace:
>
> "New I/O worker #23" #75 prio=5 os_prio=0 tid=0x00007f6fc9764000
> nid=0xaa waiting for monitor entry [0x00007f6edd3e7000]
>     java.lang.Thread.State: BLOCKED (on object monitor)
> at
> ch.qos.logback.core.OutputStreamAppender.subAppend(OutputStreamAppender.java:211)
> - waiting to lock <0x00000000ab0f8f50> (a
> ch.qos.logback.core.spi.LogbackLock)
> at
> ch.qos.logback.core.OutputStreamAppender.append(OutputStreamAppender.java:103)
> at
> ch.qos.logback.core.UnsynchronizedAppenderBase.doAppend(UnsynchronizedAppenderBase.java:88)
> at
> ch.qos.logback.core.spi.AppenderAttachableImpl.appendLoopOnAppenders(AppenderAttachableImpl.java:48)
> at ch.qos.logback.classic.Logger.appendLoopOnAppenders(Logger.java:273)
> at ch.qos.logback.classic.Logger.callAppenders(Logger.java:260)
> at ch.qos.logback.classic.Logger.buildLoggingEventAndAppend(Logger.java:442)
> at ch.qos.logback.classic.Logger.filterAndLog_0_Or3Plus(Logger.java:396)
> at ch.qos.logback.classic.Logger.info
> <http://ch.qos.logback.classic.Logger.info>(Logger.java:600)
> at play.api.LoggerLike$class.info <http://class.info>(Logger.scala:93)
> at play.api.Logger$.info(Logger.scala:167)
>
> Any suggestions on what may be going on here?
>
> Thanks
> -greg
>
>
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