FIX: MS DTC Transaction Commit Operation Blocks Itself (821740)


The information in this article applies to:

  • Microsoft SQL Server 2000 Developer Edition
  • Microsoft SQL Server 2000 Standard Edition
  • Microsoft SQL Server 2000 Enterprise Edition
  • Microsoft SQL Server 2000 Personal Edition
  • Microsoft SQL Server 2000 Enterprise Evaluation Edition
  • Microsoft SQL Server 2000 Workgroup Edition
  • Microsoft SQL Server 2000 Desktop Engine (MSDE)
  • Microsoft SQL Server 2000 Developer Edition 64 bit
  • Microsoft SQL Server 2000 Enterprise Edition 64-bit
BUG #: 469703 (SHILOH_BUGS)

SYMPTOMS

A Microsoft Distributed Transaction Coordinator (MS DTC) transaction commit operation may cause a blocking scenario on itself. In the SQL Server sysprocesses table output, the SQL Server process ID number (SPID) is less than 50 and shows a self block. For example, the sysprocesses table output may show the following block:
SPID 8 blocked by SPID 8
Note MS DTC commit operations always occur on a system task thread.

RESOLUTION

Service pack information

To resolve this problem, obtain the latest service pack for Microsoft SQL Server 2000. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:

290211 How to obtain the latest SQL Server 2000 service pack

Hotfix information

The English version of this fix has the file attributes (or later) that are listed in the following table. The dates and times for these files are listed in coordinated universal time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time tool in Control Panel. 
   Date         Time   Version         Size       File name
   -------------------------------------------------------------------
   31-May-2003  18:45  2000.80.818.0      78,400  Console.exe      
   25-Jun-2003  01:01  2000.80.818.0      33,340  Dbmslpcn.dll     
   25-Apr-2003  02:12                    786,432  Distmdl.ldf
   25-Apr-2003  02:12                  2,359,296  Distmdl.mdf
   30-Jan-2003  01:55                        180  Drop_repl_hotfix.sql
   23-Jun-2003  22:40  2000.80.837.0   1,557,052  Dtsui.dll        
   23-Jun-2003  22:40  2000.80.837.0     639,552  Dtswiz.dll       
   24-Apr-2003  02:51                    747,927  Instdist.sql
   03-May-2003  01:56                      1,581  Inst_repl_hotfix.sql
   08-Feb-2003  06:40  2000.80.765.0      90,692  Msgprox.dll      
   01-Apr-2003  02:07                      1,873  Odsole.sql
   05-Apr-2003  01:46  2000.80.800.0      62,024  Odsole70.dll     
   07-May-2003  20:41  2000.80.819.0      25,144  Opends60.dll     
   02-Apr-2003  21:48  2000.80.796.0      57,904  Osql.exe         
   02-Apr-2003  23:15  2000.80.797.0     279,104  Pfutil80.dll     
   22-May-2003  22:57                     19,195  Qfe469571.sql
   12-Jun-2003  16:37                  1,083,989  Replmerg.sql
   04-Apr-2003  21:53  2000.80.798.0     221,768  Replprov.dll     
   08-Feb-2003  06:40  2000.80.765.0     307,784  Replrec.dll      
   05-May-2003  00:05                  1,085,874  Replsys.sql
   01-Jun-2003  01:01  2000.80.818.0     492,096  Semobj.dll       
   31-May-2003  18:27  2000.80.818.0     172,032  Semobj.rll
   29-May-2003  00:29                    115,944  Sp3_serv_uni.sql
   01-Jun-2003  01:01  2000.80.818.0   4,215,360  Sqldmo.dll       
   07-Apr-2003  17:44                     25,172  Sqldumper.exe    
   19-Mar-2003  18:20  2000.80.789.0      28,672  Sqlevn70.rll
   02-Jul-2003  00:18  2000.80.834.0     180,736  Sqlmap70.dll     
   08-Feb-2003  06:40  2000.80.765.0      57,920  Sqlrepss.dll     
   23-Jun-2003  22:40  2000.80.837.0   7,553,105  Sqlservr.exe     
   08-Feb-2003  06:40  2000.80.765.0      45,644  Sqlvdi.dll       
   25-Jun-2003  01:01  2000.80.818.0      33,340  Ssmslpcn.dll     
   01-Jun-2003  01:01  2000.80.818.0      82,492  Ssnetlib.dll     
   01-Jun-2003  01:01  2000.80.818.0      25,148  Ssnmpn70.dll     
   01-Jun-2003  01:01  2000.80.818.0     158,240  Svrnetcn.dll     
   31-May-2003  18:59  2000.80.818.0      76,416  Svrnetcn.exe     
   30-Apr-2003  23:52  2000.80.816.0      45,132  Ums.dll          
   02-Jul-2003  00:19  2000.80.834.0      98,816  Xpweb70.dll
Note Because of file dependencies, the most recent hotfix or feature that contains these files may also contain additional files.

STATUS

Microsoft has confirmed that this is a problem in the Microsoft products that are listed at the beginning of this article. This problem was first corrected in Microsoft SQL Server 2000 Service Pack 4.

MORE INFORMATION

This problem occurs when the MS DTC commit operation tries to update the sysindexes table with appropriate row modifications. If the original transaction activity obtains an exclusive (EX) lock on the sysobjects table or the sysindexes table, the self block may occur at the time of the DTC commit operation. This condition typically occurs when the original transaction activity creates a table or index and also makes additions or subtractions to the table. One of the triggers of the behavior is the open objects option. Carefully review the number of open objects options that the instance of SQL Server 2000 may experience at the time of the problem and the sp_configure setting.

For additional information about this problem and bug #469704, click the following article number to view the article in the Microsoft Knowledge Base:

821740 FIX: Lock Monitor Exception in DeadlockMonitor::ResolveDeadlock 

ChildEBP RetAddr  Args to Child              
09a6f138 77ea9b35 00001324 00000001 00000000 NTDLL!ZwWaitForSingleObject+0xb [i386\usrstubs.asm @ 2004]
WARNING: Stack unwind information not available. Following frames may be wrong.
09a6f160 410749ac 00001324 ffffffff 00000001 KERNEL32!WaitForSingleObjectEx+0x71
09a6f17c 41072495 038ba5f0 038c7e00 038ba5f0 ums!UmsThreadScheduler::Switch+0x4c [p:\sql\ums\src\umsthrd.cpp @ 486]
09a6f1a0 410721d6 038ba5f0 4cb24564 09a6f1d8 ums!UmsScheduler::IdleLoop+0x105 [p:\sql\ums\src\umsched.cpp @ 1355]
09a6f1b4 41072d1e ffffffff 00000001 025ad1d8 ums!UmsScheduler::Suspend+0x66 [p:\sql\ums\src\umsched.cpp @ 1181]
09a6f1d8 00401202 ffffffff 00000000 00000000 ums!UmsEvent::Wait+0x8e [p:\sql\ums\src\umsevent.cpp @ 320]
09a6f21c 004378d5 ffffffff 025ad1d8 00000000 sqlservr!ExecutionContext::WaitForSignal+0x1b5 [p:\sql\ntdbms\storeng\dfs\startup\proc.c @ 1058]
09a6f254 00402d66 09a6f2e8 09a6f378 4815b1c0 sqlservr!LockOwner::Sleep+0x13d [p:\sql\ntdbms\storeng\dfs\manager\lckmgr.cpp @ 3273]
09a6f2c8 00404162 09a6f2e8 09a6f378 00000000 sqlservr!lck_lock+0x799 [p:\sql\ntdbms\storeng\dfs\manager\lckmgr.cpp @ 7173]
09a6f310 0040795e 09a6f378 00000003 00000000 sqlservr!SDES::GetLock+0x19d [p:\sql\ntdbms\storeng\dfs\access\access.c @ 870]
09a6f34c 00405c50 00000003 00000001 09a6f378 sqlservr!SDES::AcquireRowLockForScan+0x1e8 [p:\sql\ntdbms\storeng\dfs\access\getnext.c @ 1623]
09a6f3c8 00409a57 00000001 00000000 4815b1c0 sqlservr!SDES::GetBiDi+0x4ae [p:\sql\ntdbms\storeng\dfs\access\getnext.c @ 613]
09a6f41c 00409d0f 00000000 09a6f4bc 09a6f89c sqlservr!CSysScan::FGetNext+0x7f [p:\sql\ntdbms\msql\ddl\sysscan.cpp @ 3544]
09a6f434 0044d245 09a600c4 00000001 00000001 sqlservr!CSysScan::StartScan+0x163 [p:\sql\ntdbms\msql\ddl\sysscan.cpp @ 792]
09a6f49c 004f714a 09a6f89c 5587e178 00000000 sqlservr!CObjectScan::FFindById+0x95 [p:\sql\ntdbms\msql\ddl\sysscan.cpp @ 3711]
09a6f8d0 0080804d 494900c4 055d808b 42b7deb0 sqlservr!createdes+0xbe [p:\sql\ntdbms\storeng\dfs\manager\desmgr.cpp @ 679]
09a6f928 0041719c 42b7db28 494900c4 42b7deb0 sqlservr!chgind_delta+0x78 [p:\sql\ntdbms\storeng\dfs\access\chgsysin.c @ 558]
09a6f95c 0047b973 00000001 42b7db28 3f44b680 sqlservr!XdesRMFull::FlushAllSysIndexCaches+0x88 [p:\sql\ntdbms\storeng\dfs\trans\xdes.cpp @ 6992]
09a6f988 0086896a 3f44a908 00000000 00000000 sqlservr!XdesRMFull::Prepare+0x4f [p:\sql\ntdbms\storeng\dfs\trans\xdes.cpp @ 5813]
09a6f9a4 0086881c 00a1a308 3f44b680 00000000 sqlservr!XactRM::PrepareLocalXact+0x7b [p:\sql\ntdbms\storeng\dfs\trans\xactrm.cpp @ 646]
09a6f9c4 008696ce 77843790 00867868 00000005 sqlservr!XactRM::Commit+0x163 [p:\sql\ntdbms\storeng\dfs\trans\xactrm.cpp @ 472]
09a6f9cc 00867868 00000005 46b0ebc0 00000000 sqlservr!XactRM::CommitDTCXactSinglePhase+0x4b [p:\sql\ntdbms\storeng\dfs\trans\xactrm.cpp @ 1966]
09a6fc14 00864172 00000001 00000335 00a1a3d8 sqlservr!DtcXactRMOnly::PrepareDTCXact+0xc1 [p:\sql\ntdbms\storeng\dfs\trans\xact.cpp @ 3450]
09a6fc6c 004091fe 00bd6780 4cb24098 00000000 sqlservr!ISSResourceAsynch::DoTMWork+0x671 [p:\sql\ntdbms\storeng\dfs\trans\viperrm.cpp @ 2245]
09a6feac 004090d1 09a6fef8 410728a7 760846c8 sqlservr!CWorker::ProcessTskPkt+0xea [p:\sql\ntdbms\storeng\common\ondemand.cpp @ 390]
09a6feb4 410728a7 760846c8 00408cf6 00bd6780 sqlservr!TaskThread+0x14 [p:\sql\ntdbms\storeng\common\ondemand.cpp @ 475]
09a6febc 00408cf6 00bd6780 038ba61c 00000000 ums!UmsSystemUserContext::RunTask+0x7 [p:\sql\ums\src\umsched.cpp @ 1730]
09a6fef8 41075002 038ba5f0 038ba5f0 00000002 sqlservr!SystemTaskEntryPoint+0x98 [p:\sql\ntdbms\storeng\dfs\startup\conn_hdl.c @ 3365]
09a6ff6c 41074698 00bd6788 038bb1a8 09a6ffb4 ums!ProcessWorkRequests+0x272 [p:\sql\ums\src\umsworkq.cpp @ 451]
09a6ff80 7800c9eb 00bd6780 000b32b8 00adb010 ums!ThreadStartRoutine+0x98 [p:\sql\ums\src\umsthrd.cpp @ 263]
09a6ffb4 77e8b2d8 038bb1a8 000b32b8 00adb010 msvcrt!_threadstart+0x57 [thread.c @ 174]
09a6ffec 00000000 7800c994 038bb1a8 00000000 KERNEL32!lstrcmpiW+0xb7
The deadlock monitor detects the problem and tries to resolve it. Because of the nature of commit operation processing, the deadlock monitor cannot resolve the problem, causing bug #469704. The following short stack dump file is logged:
* Short Stack Dump
* 00845549 Module(sqlservr+00445549) (DeadlockMonitor::ResolveDeadlock+00000025 Line 583+00000006)
* 00845438 Module(sqlservr+00445438) (DeadlockMonitor::SearchAndResolve+00000134 Line 424+00000000)
* 004C2D12 Module(sqlservr+000C2D12) (lockMonitor+000002F7 Line 6600+00000000)
* 004C2BBC Module(sqlservr+000C2BBC) (lockMonitorThread+000000A4 Line 6414+00000005)
* 41072838 Module(UMS+00002838) (ProcessWorkRequests+00000272 Line 451+00000000)
* 410725B3 Module(UMS+000025B3) (ThreadStartRoutine+00000098 Line 263+00000007)
* 77C37E53 Module(MSVCRT+00027E53) (endthread+000000AA)
* 77E7D33B Module(kernel32+0001D33B) (RegisterWaitForInputIdle+00000043)
Modification Type:MinorLast Reviewed:10/25/2005
Keywords:kbHotfixServer kbQFE kbQFE kbSQLServ2000preSP4fix kbfix kbbug KB821740 kbAudDeveloper
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