Tom Tutko created LOG4NET-462:
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Summary: ReadOnlyPropertiesDictionary not thread safe
Key: LOG4NET-462
URL: https://issues.apache.org/jira/browse/LOG4NET-462
Project: Log4net
Issue Type: Bug
Affects Versions: 1.2.13
Reporter: Tom Tutko
Priority: Blocker
I have an application that runs as a windows service and spins up multiple
AppDomains, each with their own loggers. I will often run into an issue where
log4net appears to be causing one or more of the spun up AppDomains to not
function properly. The relevant stack trace looks as follows:
System.InvalidOperationException: Collection was modified; enumeration
operation may not execute.
at System.Collections.Hashtable.HashtableEnumerator.MoveNext()
at log4net.Util.ReadOnlyPropertiesDictionary.GetObjectData(Serialization
info, StreamingContext context)
at System.Runtime.Serialization.ObjectCloneHelper.GetObjectData(Object
serObj, String& typeName, String& assemName, String[]& fieldNames,
Object[]& fieldValues)
I have not been able to find the specific conditions to reproduce this but it
happens often enough to be a huge problem. Looking at the log4net source, the
ReadOnlyPropertiesDictionary.GetObjectData() method does a foreach over the
InnerHashTable collection but there is nothing to stop that collection from
being modified outside of that loop which is leading to the exception. I am not
sure where in my code I would be doing anything that modified that collection
indirectly but I do know that I push several things on and off of the
LogicalThreadContext.
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