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[Release/3.1] Fix race condition issues between SinglePhaseCommit and TransactionEnded events #43070

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May 6, 2021
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[Release/3.1] Fix race condition issues between SinglePhaseCommit and TransactionEnded events #43070

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81 changes: 39 additions & 42 deletions src/System.Data.SqlClient/src/System/Data/SqlClient/SqlDelegatedTransaction.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -314,24 +314,21 @@ public void SinglePhaseCommit(SinglePhaseEnlistment enlistment)
RuntimeHelpers.PrepareConstrainedRegions();
try
{
// If the connection is doomed, we can be certain that the
// transaction will eventually be rolled back, and we shouldn't
// attempt to commit it.
if (connection.IsConnectionDoomed)
lock (connection)
{
lock (connection)
// If the connection is doomed, we can be certain that the
// transaction will eventually be rolled back or is externally aborted, and we shouldn't
// attempt to commit it.
if (connection.IsConnectionDoomed)
{
_active = false; // set to inactive first, doesn't matter how the rest completes, this transaction is done.
_connection = null;
}

enlistment.Aborted(SQL.ConnectionDoomed());
}
else
{
Exception commitException;
lock (connection)
enlistment.Aborted(SQL.ConnectionDoomed());
}
else
{
Exception commitException;
try
{
// Now that we've acquired the lock, make sure we still have valid state for this operation.
Expand All @@ -357,40 +354,40 @@ public void SinglePhaseCommit(SinglePhaseEnlistment enlistment)
commitException = e;
connection.DoomThisConnection();
}
}
if (commitException != null)
{
// connection.ExecuteTransaction failed with exception
if (_internalTransaction.IsCommitted)
{
// Even though we got an exception, the transaction
// was committed by the server.
enlistment.Committed();
}
else if (_internalTransaction.IsAborted)
if (commitException != null)
{
// The transaction was aborted, report that to
// SysTx.
enlistment.Aborted(commitException);
// connection.ExecuteTransaction failed with exception
if (_internalTransaction.IsCommitted)
{
// Even though we got an exception, the transaction
// was committed by the server.
enlistment.Committed();
}
else if (_internalTransaction.IsAborted)
{
// The transaction was aborted, report that to
// SysTx.
enlistment.Aborted(commitException);
}
else
{
// The transaction is still active, we cannot
// know the state of the transaction.
enlistment.InDoubt(commitException);
}

// We eat the exception. This is called on the SysTx
// thread, not the applications thread. If we don't
// eat the exception an UnhandledException will occur,
// causing the process to FailFast.
}
else

connection.CleanupConnectionOnTransactionCompletion(_atomicTransaction);
if (commitException == null)
{
// The transaction is still active, we cannot
// know the state of the transaction.
enlistment.InDoubt(commitException);
// connection.ExecuteTransaction succeeded
enlistment.Committed();
}

// We eat the exception. This is called on the SysTx
// thread, not the applications thread. If we don't
// eat the exception an UnhandledException will occur,
// causing the process to FailFast.
}

connection.CleanupConnectionOnTransactionCompletion(_atomicTransaction);
if (commitException == null)
{
// connection.ExecuteTransaction succeeded
enlistment.Committed();
}
}
}
Expand Down