Hello Curt, Here is the reference to the created bug: https://issues.apache.org/bugzilla/show_bug.cgi?id=50463
<https://issues.apache.org/bugzilla/show_bug.cgi?id=50463>Regards, Louis On Mon, Dec 13, 2010 at 5:44 AM, Curt Arnold <[email protected]> wrote: > Thanks for the report and patch. Creating a new bug would be better. > Patch looks good on a first visual check. > > > On Dec 10, 2010, at 3:11 AM, Louis Jacomet wrote: > > > Hi all, > > > > I recently investigated a deadlock happening inside our JBoss AS. > > I tracked down the root cause to the AsyncAppender of log4j. > > We use it in blocking mode, with the default buffer size of 128. I was > able to reproduce the deadlock live even when increasing the buffer size to > 512. > > > > The problem comes from a race condition when the dispatcher thread dies > from an exception. When that happens, if the buffer has been filled up by > other threads doing logging, the thread currently waiting on the buffer to > be emptied will never be notified and wait there forever. > > As a category lock is held to access the appender, this lead other > threads to block forever. > > > > I found a bug in the database: > https://issues.apache.org/bugzilla/show_bug.cgi?id=45915 > > However, the root cause was associated to logging from the Dispatcher > thread. I have attached a test cause causing the deadlock, showing it can > occur even when not logging from the dispatcher thread. > > > > Should I reopen that bug or create a new one? > > > > We are using log4j 1.2.14 and JBoss AS 4.3.0. > > The latest trunk version of AsyncAppender still suffers from the race > condition. > > > > Regards, > > Louis > > <Log4JAsyncAppenderDeadLock.java> > > --------------------------------------------------------------------- > > To unsubscribe, e-mail: [email protected] > > For additional commands, e-mail: [email protected] > > > --------------------------------------------------------------------- > To unsubscribe, e-mail: [email protected] > For additional commands, e-mail: [email protected] > >
