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From "Dan K (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LOG4NET-551) LockRecursionException when using File Appenders
Date Tue, 07 Mar 2017 20:13:38 GMT

    [ https://issues.apache.org/jira/browse/LOG4NET-551?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15900067#comment-15900067

Dan K commented on LOG4NET-551:

Hi Stefan, 

This is awesome news and thank you/your team for staying on top of this effort! You have our
vote! Also, we now have 3 different test systems with v2.0.8 (locally built version) still
running full throttle and no exceptions. This is the results we we were looking for and hopefully
our findings can help others as well. We will be glad to test the "official" release v2.0.8
when it comes out. I will post feedback/results after that's done. Thanks again! :)

> LockRecursionException when using File Appenders
> ------------------------------------------------
>                 Key: LOG4NET-551
>                 URL: https://issues.apache.org/jira/browse/LOG4NET-551
>             Project: Log4net
>          Issue Type: Bug
>    Affects Versions: 2.0.7
>            Reporter: Matthew Lefoster
>            Priority: Minor
>             Fix For: 2.0.8
> I have been getting the following exception on the console:
> {quote}
> log4net:ERROR Exception while logging
> System.Threading.LockRecursionException: Recursive read lock acquisitions not allowed
in this mode.
>    at System.Threading.ReaderWriterLockSlim.TryEnterReadLockCore(TimeoutTracker timeout)
>    at System.Threading.ReaderWriterLockSlim.TryEnterReadLock(TimeoutTracker timeout)
>    at System.Threading.ReaderWriterLockSlim.EnterReadLock()
>    at log4net.Util.ReaderWriterLock.AcquireReaderLock()
>    at log4net.Repository.Hierarchy.Logger.CallAppenders(LoggingEvent loggingEvent)
>    at log4net.Repository.Hierarchy.Logger.ForcedLog(Type callerStackBoundaryDeclaringType,
Level level, Object message, Exception exception)
>    at log4net.Repository.Hierarchy.Logger.Log(Type callerStackBoundaryDeclaringType,
Level level, Object message, Exception exception)
> {quote}
> I have a number of different appenders, but this only happens when I am using `log4net.Appender.FileAppender`.
> Using a debugger, I was able to narrow it down to this line (I replaced curly brackets
with square brackets because otherwise JIRA interprets them as macros):
> {quote}
> Logger.DebugFormat("[1] Executing SQL: [0][2][0]With parameters: [3]",
>                 Environment.NewLine, methodName, sql, new ToStringWrapper(parameters));
> {quote}
> My first thought was that ToStringWrapper() was throwing an exception or generating another
logging call. But If I put breakpoints at the log call and at the first line of ToStringWrapper.ToString,
the exception will show up in the console between those two points.
> Oddly enough, if I "step into" the logging call instead of just "continuing" and letting
the breakpoints handle it, no exception happens.

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