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

[Greg Nitro]

Hi Ceki,

Thanks for the quick response.  Attached is the xml file with the
configuration.

-greg



On Mon, Apr 11, 2016 at 12:48 PM, Ceki Gulcu <ceki at qos.ch> wrote:

>
> 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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