Affects Version/s: 1.2.13
Fix Version/s: None
There's a chance InterProcessLock.AcquireLock hangs, and lots of Appender.AppenderSkeleton.DoAppend threads queued.
It happens to our service every 2 days, all happen after mid-night. So after a new log file created, few new line in the file added. But not always happens.
As there're hundreds of Appender.AppenderSkeleton.DoAppend threads queued, it blocks everywhere in the service that uses log4net.
log4net is supposed to be 'failure-free' or at least fails quietly, not block the whole application.
<lockingModel type="log4net.Appender.FileAppender+InterProcessLock" />
So far it has hanged for few (8+) hours already.
The attached screen shot was taken by remote debug from a server after 8+ hours of hanging.