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<a class="user-hover" rel="gunnar" id="email_gunnar" href="http://jira.qos.ch/secure/ViewProfile.jspa?name=gunnar" style="color:#326ca6;">Gunnar Wagenknecht</a>
created <img src="http://jira.qos.ch/images/icons/bug.gif" height="16" width="16" border="0" align="absmiddle" alt="Bug"> <a style='color:#326ca6;text-decoration:none;' href='http://jira.qos.ch/browse/LBCLASSIC-331'>LBCLASSIC-331</a>
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<a style='color:#326ca6;text-decoration:none;' href='http://jira.qos.ch/browse/LBCLASSIC-331'><strong>Console appender may deadlock when System.out is hijacked</strong></a>
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<strong style="font-weight:normal;color:#505050;">Issue Type:</strong>
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<img src="http://jira.qos.ch/images/icons/bug.gif" height="16" width="16" border="0" align="absmiddle" alt="Bug"> Bug
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<strong style="font-weight:normal;color:#505050;">Affects Versions:</strong>
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1.0.0 </td>
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<strong style="font-weight:normal;color:#505050;">Assignee:</strong>
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<a class="user-hover" rel="logback-dev@qos.ch" id="email_logback-dev@qos.ch" href="http://jira.qos.ch/secure/ViewProfile.jspa?name=logback-dev%40qos.ch" style="color:#326ca6;">Logback dev list</a>
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<strong style="font-weight:normal;color:#505050;">Components:</strong>
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appender </td>
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<strong style="font-weight:normal;color:#505050;">Created:</strong>
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22/May/12 1:43 PM
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<strong style="font-weight:normal;color:#505050;">Description:</strong>
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<td style="color:#000000;font-family:Arial,FreeSans,Helvetica,sans-serif;font-size:12px;padding:0 0 10px 0;width:100%;">
The issue is weird and may be a special case. However, I wonder if anything can be implemented in Logback to detect and workaround such issues.
<br/>
<br/>
>From <a href="https://issues.apache.org/jira/browse/SSHD-152:">https://issues.apache.org/jira/browse/SSHD-152:</a>
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<br/>
I'm not really sure what I did but I think I somehow managed to deadlock my system using SSHD in combination with Logback console appender.
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<br/>
Thread 1
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{noformat}
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Thread [Thread-21] (Suspended)
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owns: ChannelOutputStream (id=481)
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owns: ConsoleOutputStream (id=482)
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owns: PrintStream (id=483)
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owns: Object (id=202)
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waited by: Thread [...] (Suspended)
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waited by: Thread [...] (Suspended)
<br/>
waited by: Thread [...] (Suspended)
<br/>
waited by: Thread [NioProcessor-2] (Suspended)
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waited by: Thread [...] (Suspended)
<br/>
waited by: Thread [...] (Suspended)
<br/>
waited by: Thread [...] (Suspended)
<br/>
waited by: Thread [...] (Suspended)
<br/>
waited by: Thread [...] (Suspended)
<br/>
waited by: Thread [...] (Suspended)
<br/>
owns: OutputStreamWriter (id=484)
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waiting for: Window (id=485)
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Object.wait(long) line: not available [native method]
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Window(Object).wait() line: 503
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Window.waitForSpace() line: 146
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ChannelOutputStream.flush() line: 104
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ConsoleOutputStream.flush() line: 97
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ConsoleOutputStream.write(int) line: 83
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ConsoleOutputStream(OutputStream).write(byte[], int, int) line: 116
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PrintStream.write(byte[], int, int) line: 480
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PrintStream(FilterOutputStream).write(byte[]) line: 97
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ThreadPrintStream.write(byte[]) line: 245
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ConsoleTarget$1.write(byte[]) line: 36
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PatternLayoutEncoder(LayoutWrappingEncoder<E>).doEncode(E) line: 103
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ConsoleAppender<E>(OutputStreamAppender<E>).writeOut(E) line: 193
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ConsoleAppender<E>(OutputStreamAppender<E>).subAppend(E) line: 217
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ConsoleAppender<E>(OutputStreamAppender<E>).append(E) line: 108
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ConsoleAppender<E>(UnsynchronizedAppenderBase<E>).doAppend(E) line: 88
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AppenderAttachableImpl<E>.appendLoopOnAppenders(E) line: 64
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Logger.appendLoopOnAppenders(ILoggingEvent) line: 285
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Logger.callAppenders(ILoggingEvent) line: 272
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Logger.buildLoggingEventAndAppend(String, Marker, Level, String, Object[], Throwable) line: 473
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Logger.filterAndLog_2(String, Marker, Level, String, Object, Object, Throwable) line: 464
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Logger.debug(String, Object, Object) line: 542
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ChannelOutputStream.flush() line: 119
<br/>
...
<br/>
{noformat}
<br/>
<br/>
Thread 2
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{noformat}
<br/>
<br/>
Thread [NioProcessor-2] (Suspended)
<br/>
owns: Object (id=150)
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waiting for: Object (id=202)
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owned by: Thread [Thread-21] (Suspended)
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waiting for: Window (id=485)
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ConsoleAppender<E>(OutputStreamAppender<E>).subAppend(E) line: 217
<br/>
ConsoleAppender<E>(OutputStreamAppender<E>).append(E) line: 108
<br/>
ConsoleAppender<E>(UnsynchronizedAppenderBase<E>).doAppend(E) line: 88
<br/>
AppenderAttachableImpl<E>.appendLoopOnAppenders(E) line: 64
<br/>
Logger.appendLoopOnAppenders(ILoggingEvent) line: 285
<br/>
Logger.callAppenders(ILoggingEvent) line: 272
<br/>
Logger.buildLoggingEventAndAppend(String, Marker, Level, String, Object[], Throwable) line: 473
<br/>
Logger.filterAndLog_1(String, Marker, Level, String, Object, Throwable) line: 445
<br/>
Logger.debug(String, Object) line: 538
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ServerSession.handleMessage(Buffer) line: 119
<br/>
...
<br/>
{noformat}
<br/>
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<strong style="font-weight:normal;color:#505050;">Project:</strong>
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<td style="color:#000000;font-family:Arial,FreeSans,Helvetica,sans-serif;font-size:12px;padding:0 0 10px 0;width:100%;">
<a style="color:#326ca6;" href="http://jira.qos.ch/browse/LBCLASSIC">logback-classic</a>
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<strong style="font-weight:normal;color:#505050;">Priority:</strong>
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<img src="http://jira.qos.ch/images/icons/priority_major.gif" height="16" width="16" border="0" align="absmiddle" alt="Major"> Major
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<strong style="font-weight:normal;color:#505050;">Reporter:</strong>
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<td style="color:#000000;font-family:Arial,FreeSans,Helvetica,sans-serif;font-size:12px;padding:0 0 10px 0;width:100%;">
<a class="user-hover" rel="gunnar" id="email_gunnar" href="http://jira.qos.ch/secure/ViewProfile.jspa?name=gunnar" style="color:#326ca6;">Gunnar Wagenknecht</a>
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