System.NullReferenceException at
FirebirdSql.Data.FirebirdClient.FbConnectionPool.get_Count()
---------------------------------------------------------------------------------------------
Key: DNET-366
URL: http://tracker.firebirdsql.org/browse/DNET-366
Project: .NET Data provider
Issue Type: Bug
Components: ADO.NET Provider
Affects Versions: 2.6
Environment: .NET 3.5 with the 2.6.0 provider
Reporter: Fernando Nájera
Assignee: Jiri Cincura
Priority: Critical
I just got the following exception while my application was running:
System.NullReferenceException: Object reference not set to an instance of an
object.
at FirebirdSql.Data.FirebirdClient.FbConnectionPool.get_Count() in
C:\Users\Jiri\Desktop\NETProvider\source\FirebirdSql\Data\FirebirdClient\FbConnectionPool.cs:line
82
at FirebirdSql.Data.FirebirdClient.FbConnectionPool.CleanupWorker(Object
state) in
C:\Users\Jiri\Desktop\NETProvider\source\FirebirdSql\Data\FirebirdClient\FbConnectionPool.cs:line
303
at System.Threading._TimerCallback.TimerCallback_Context(Object state)
at System.Threading.ExecutionContext.runTryCode(Object userData)
at
System.Runtime.CompilerServices.RuntimeHelpers.ExecuteCodeWithGuaranteedCleanup(TryCode
code, CleanupCode backoutCode, Object userData)
at System.Threading.ExecutionContext.RunInternal(ExecutionContext
executionContext, ContextCallback callback, Object state)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext,
ContextCallback callback, Object state)
at System.Threading._TimerCallback.PerformTimerCallback(Object state)
Unfortunately I cannot replicate it -- which is probably because this might be
a timing issue (I can see threads in the stacktrace... so probably I hit a race
condition).
Having a look at the source code of FbConnectionPool, I guess the problem might
be that one thread is disposing the object while another one is asking for
.Count. I can see that .Count is calling "lock (this.unlocked.SyncRoot)", but
during the disposal that variable might be already null...
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