Fyodor Soikin created LOG4NET-431:
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Summary: The AppenderSkeleton.DoAppend methods may cause deadlocks
Key: LOG4NET-431
URL: https://issues.apache.org/jira/browse/LOG4NET-431
Project: Log4net
Issue Type: Bug
Components: Appenders
Reporter: Fyodor Soikin
The AppenderSkeleton.DoAppender method calls a few methods (in particular,
FilterEvent, PreAppendCheck, and Append), which are virtual.
Calling code you don't control from within a synchronization block is a major
no-no, thread-safely speaking. It may cause deadlocks - and, in my case, does
cause them.
In my particular case, the runaway code path starts with calling .ToString() on
one of the format arguments. That particular argument is a complex object,
whose ToString() implementation calls a few other components, some of which
also use [poorly designed] synchronization constructs.
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