PREEMPTIVE_OS_AUTHZINITIALIZECONTEXTFROMSID

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Description:

This wait type is when a thread is calling the Windows AuthzInitializeContextFromSid function.

(Books Online description: N/A)

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Added in SQL Server version:

2008

Removed in SQL Server version:

N/A

Extended Events wait_type value:

The map_key value in sys.dm_xe_map_values is 379 in 2008 and 2008 R2, 427 in 2012, and 443 in 2014 RTM. After 2014 RTM, you must check the DMV to get the latest value as some map_key values have changed in later builds.

Other information:

I have not seen this wait type be a noticeable contention point.

Note that when a thread calls out to Windows, the thread changes from non-preemptive (SQL Server controls the thread) to preemptive (Windows controls the thread) mode. The thread’s state will be listed as RUNNING, as SQL Server doesn’t know what Windows is doing with the thread.

Known occurrences in SQL Server (list number matches call stack list):

1. Initializing a security context (in this case, while pulling data from a linked server)
2. Initializing a security context (in this case, while sending a Service Broker message)
3. Initializing a security context (in this case, while creating an In-memory OLTP stored procedure)

And other similar call stacks.

Abbreviated call stacks (list number matches known occurrences list):

1. SOS_Task::PopWait+ba
   AutoSwitchPreemptive::~AutoSwitchPreemptive+6e
   CWindowsSecurityPrimaryInfo::GetNtGroupsViaAuthZ+282
   CWindowsSecurityPrimaryInfo::Init+1f8
   GetWindowsSecurityPrimaryInfo+e3
   CRowsetNtUserOrGroupInstantiate::GetIUtRowsetInstance+134
   CUtRowset::Init+36
   CreateIRowset+69
   COledbRangeUtRowset::GetRowset+250
   CQScanRmtScanNew::OpenConnection+24d
   CQScanRmtBaseNew::OpenHelper+4a
   CQScanHash::ConsumeBuild+e2
   CQScanHash::Iterate+5f
   CQScanHash::Open+79
2. SOS_Task::PopWait+bc
   SOS_Task::AutoSwitchPreemptive::~AutoSwitchPreemptive+72
   CWindowsSecurityPrimaryInfo::GetNtGroupsViaAuthZ+221
   CWindowsSecurityPrimaryInfo::Init+186
   GetWindowsSecurityPrimaryInfo+8e
   CreateLoginToken+2c5
   CreateLoginTokenForImpersonation+60d
   CAutoExecuteAsContext::Set+c5
   CSbSecurityMgr::AccessCheckExecuteAs+1dd
   CSbSecurityMgr::AccessCheckServiceSEND+30
   CDialogEndpoint::FCreateTarget+212
   CDialogEndpoint::ReceiveMessageInternal+5e
   CDialogEndpoint::ReceiveMessageList+7d4
   CSsbClassifier::SendMessage+6c3
   CDialogEndpoint::SendMessage+951
   CDialogEndpoint::SendSequencedMsg+34d
   CStmtSendMsg::XretSvcBrokerExecute+4d1
   CXStmtBrokerDDL::XretExecute+137
   CMsqlExecContext::ExecuteStmts<1,1>+352
   CMsqlExecContext::FExecute+878
   CSQLSource::Execute+7d3
3. SOS_Task::PopWait+b1
   SOS_ExternalAutoWait::~SOS_ExternalAutoWait+7c
   CWindowsSecurityPrimaryInfo::GetNtGroupsViaAuthZ+392
   CWindowsSecurityPrimaryInfo::Init+2f5
   GetWindowsSecurityPrimaryInfo+be
   CreateLoginToken+263
   CreateLoginTokenForImpersonation+a7a
   CAutoExecuteAsContext::Set+df7
   CSECExecAsRuntimeServices::_Set+47f
   FHasPerms+4d
   CreateHkProcedure+3f8
   CStmtCreateSqlProc::UpdateObject+318
   CStmtCreateSqlProc::XretDoExecute+369
   CStmtCreateSql::XretExecute+5e
   CMsqlExecContext::ExecuteStmts<1,1>+427
   CMsqlExecContext::FExecute+a43
   CSQLSource::Execute+86c