LDAP IIS 6 Problem

shp1979 — Tue, 09 Oct 2007 22:56:58 GMT

Hi,

I am trying to query an LDAP server to fetch user password expiration details. We want to show a warning message if this user's password is about to expire. The application works fine for some time (varying from 5 - 6 login attempts to 25 -30 login attempts) and then w3wp starts consuming 25% of CPU and eventually stops responding to any request. In my code (C#), I am disposing all LDAP related objects in finally block. I have also added some timeouts (LDAP client and server timeouts) to make sure that application won’t wait if the LDAP server is not responding in a reasonable time. I also tried to run iisstate to see what all threads are running but couldn’t identify anything significant from that information ( I don’t have good knowledge of how to debug stack trace information generated by the iisstate). So, right now I have no clue about what is going wrong.

I checked the threads that were running in w3wp process when it started consuming 25% CPU time. There was one thread msvcrt.dll!endthread that was eating up 25% CPU time.

I am not sure what this thread does. I also saw couple of other threads like ntdll.dll! RtlOpenCurrentUser and I am not sure how/whether they are related.

I wonder if anyone can help to understand what are msvcrt.dll ntdll.dll and w3tp.dl processes and how they are used by w3wp( if they are used by w3wp process). What is RtlOpenCurrentUser in ntdll.dll

I am sending the stack trace generated by iisstate. Please let me know if you figured out something from this trace.

***********************

Symbol search path is: SRV*C:\iisstate\symbols*http://msdl.microsoft.com/download/symbols

Microsoft (R) Windows Debugger Version 6.2.0013.1

*** wait with pending attach

Symbol search path is: SRV*C:\iisstate\symbols*http://msdl.microsoft.com/download/symbols

Executable search path is:

WARNING: Process 4532 is not attached as a debuggee

The process can be examined but debug events will not be received

.........................................................................................................................................

The call to LoadLibrary(exts) failed, Win32 error 2

"The system cannot find the file specified."

Please check your debugger configuration and/or network access.

(11b4.774): Wake debugger - code 80000007 (first chance)

Opened log file 'C:\iisstate\output\IISState-4532.log'

***********************

Starting new log output

IISState version 3.3.1

Tue Oct 09 11:47:14 2007

OS = Windows 2003 Server

Executable: w3wp.exe

PID = 4532

Note: Thread times are formatted as HH:MM:SS.ms

***********************

Thread ID: 0

System Thread ID: 774

Kernel Time: 0:0:0.31

User Time: 0:0:0.109

Thread Status: Thread is in a WAIT state.

Thread Type: HTTP Compression Thread

# ChildEBP RetAddr

00 0006fc08 7c827d0b ntdll!KiFastSystemCallRet

01 0006fc0c 77e61d1e ntdll!NtWaitForSingleObject+0xc

02 0006fc7c 77e61c8d kernel32!WaitForSingleObjectEx+0xac

03 0006fc90 5a364662 kernel32!WaitForSingleObject+0x12

04 0006fca0 5a366e3f w3dt!WP_CONTEXT::RunMainThreadLoop+0x10

05 0006fca8 5a3af42d w3dt!UlAtqStartListen+0x2d

06 0006fcb8 5a3bc335 w3core!W3_SERVER::StartListen+0xbd

07 0006ff0c 0100187c w3core!UlW3Start+0x26e

08 0006ff44 01001a27 w3wp!wmain+0x22a

09 0006ffc0 77e6f23b w3wp!wmainCRTStartup+0x12f

0a 0006fff0 00000000 kernel32!BaseProcessStart+0x23

Thread ID: 1

System Thread ID: 3a4

Kernel Time: 0:0:0.0

User Time: 0:0:0.0

Thread Type: Other

# ChildEBP RetAddr

00 00ccff9c 7c826f4b ntdll!KiFastSystemCallRet

01 00ccffa0 7c83d424 ntdll!NtDelayExecution+0xc

02 00ccffb8 77e64829 ntdll!RtlpTimerThread+0x47

03 00ccffec 00000000 kernel32!BaseThreadStart+0x34

Thread ID: 2

System Thread ID: 17f4

Kernel Time: 0:0:0.0

User Time: 0:0:0.0

Thread Type: Other

# ChildEBP RetAddr

00 00d0ff70 7c8277db ntdll!KiFastSystemCallRet

01 00d0ff74 7c839f38 ntdll!ZwRemoveIoCompletion+0xc

02 00d0ffb8 77e64829 ntdll!RtlpWorkerThread+0x3d

03 00d0ffec 00000000 kernel32!BaseThreadStart+0x34

Thread ID: 3

System Thread ID: 1ab8

Kernel Time: 0:0:0.0

User Time: 0:0:0.0

Thread Type: Possible ASP page. Possible DCOM activity

Executing Page: Unable to locate ASP page

No remote call being made

# ChildEBP RetAddr

00 00d7fe18 7c82783b ntdll!KiFastSystemCallRet

01 00d7fe1c 77c885ac ntdll!NtReplyWaitReceivePortEx+0xc

02 00d7ff84 77c88792 RPCRT4!LRPC_ADDRESS::ReceiveLotsaCalls+0x198

03 00d7ff8c 77c8872d RPCRT4!RecvLotsaCallsWrapper+0xd

04 00d7ffac 77c7b110 RPCRT4!BaseCachedThreadRoutine+0x9d

05 00d7ffb8 77e64829 RPCRT4!ThreadStartRoutine+0x1b

06 00d7ffec 00000000 kernel32!BaseThreadStart+0x34

Thread ID: 4

System Thread ID: 1aa0

Kernel Time: 0:0:0.0

User Time: 0:0:0.0

Thread Type: HTTP Listener

# ChildEBP RetAddr

00 00f7ff24 7c8277db ntdll!KiFastSystemCallRet

01 00f7ff28 77e5bea2 ntdll!ZwRemoveIoCompletion+0xc

02 00f7ff54 5a30248e kernel32!GetQueuedCompletionStatus+0x29

03 00f7ff8c 5a3026ac W3TP!THREAD_POOL_DATA::ThreadPoolThread+0x33

04 00f7ffa0 5a301da9 W3TP!THREAD_POOL_DATA::ThreadPoolThread+0x24

05 00f7ffb8 77e64829 W3TP!THREAD_MANAGER::ThreadManagerThread+0x39

06 00f7ffec 00000000 kernel32!BaseThreadStart+0x34

Thread ID: 5

System Thread ID: b30

Kernel Time: 0:0:0.0

User Time: 0:0:0.0

Thread Type: HTTP Listener

# ChildEBP RetAddr

00 00fbff24 7c8277db ntdll!KiFastSystemCallRet

01 00fbff28 77e5bea2 ntdll!ZwRemoveIoCompletion+0xc

02 00fbff54 5a30248e kernel32!GetQueuedCompletionStatus+0x29

03 00fbff8c 5a3026ac W3TP!THREAD_POOL_DATA::ThreadPoolThread+0x33

04 00fbffa0 5a301da9 W3TP!THREAD_POOL_DATA::ThreadPoolThread+0x24

05 00fbffb8 77e64829 W3TP!THREAD_MANAGER::ThreadManagerThread+0x39

06 00fbffec 00000000 kernel32!BaseThreadStart+0x34

Thread ID: 6

System Thread ID: 1760

Kernel Time: 0:0:0.0

User Time: 0:0:0.15

Thread Type: HTTP Listener

# ChildEBP RetAddr

00 00ffff24 7c8277db ntdll!KiFastSystemCallRet

01 00ffff28 77e5bea2 ntdll!ZwRemoveIoCompletion+0xc

02 00ffff54 5a30248e kernel32!GetQueuedCompletionStatus+0x29

03 00ffff8c 5a3026ac W3TP!THREAD_POOL_DATA::ThreadPoolThread+0x33

04 00ffffa0 5a301da9 W3TP!THREAD_POOL_DATA::ThreadPoolThread+0x24

05 00ffffb8 77e64829 W3TP!THREAD_MANAGER::ThreadManagerThread+0x39

06 00ffffec 00000000 kernel32!BaseThreadStart+0x34

Thread ID: 7

System Thread ID: 520

Kernel Time: 0:0:0.46

User Time: 0:0:0.0

Thread Type: HTTP Listener

# ChildEBP RetAddr

00 0104ff24 7c8277db ntdll!KiFastSystemCallRet

01 0104ff28 77e5bea2 ntdll!ZwRemoveIoCompletion+0xc

02 0104ff54 5a30248e kernel32!GetQueuedCompletionStatus+0x29

03 0104ff8c 5a3026ac W3TP!THREAD_POOL_DATA::ThreadPoolThread+0x33

04 0104ffa0 5a301da9 W3TP!THREAD_POOL_DATA::ThreadPoolThread+0x24

05 0104ffb8 77e64829 W3TP!THREAD_MANAGER::ThreadManagerThread+0x39

06 0104ffec 00000000 kernel32!BaseThreadStart+0x34

Thread ID: 8

System Thread ID: b68

Kernel Time: 0:0:0.0

User Time: 0:0:0.0

Thread Status: Thread is in a WAIT state.

Thread Type: Other

# ChildEBP RetAddr

00 0110fcec 7c827cfb ntdll!KiFastSystemCallRet

01 0110fcf0 7c83c78e ntdll!NtWaitForMultipleObjects+0xc

02 0110ffb8 77e64829 ntdll!RtlpWaitThread+0x161

03 0110ffec 00000000 kernel32!BaseThreadStart+0x34

Thread ID: 9

System Thread ID: 220

Kernel Time: 0:0:0.0

User Time: 0:0:0.0

Thread Status: Thread is in a WAIT state.

Thread Type: HTTP Compression Thread

# ChildEBP RetAddr

00 01adfa84 7c827d0b ntdll!KiFastSystemCallRet

01 01adfa88 77e61d1e ntdll!NtWaitForSingleObject+0xc

02 01adfaf8 77e61c8d kernel32!WaitForSingleObjectEx+0xac

03 01adfb0c 5a3b820f kernel32!WaitForSingleObject+0x12

04 01adffb8 77e64829 w3core!HTTP_COMPRESSION::CompressionThread+0x126

05 01adffec 00000000 kernel32!BaseThreadStart+0x34

Thread ID: 10

System Thread ID: 1054

Kernel Time: 0:0:0.0

User Time: 0:0:0.0

Thread Type: Possible ASP page. Possible DCOM activity

Executing Page: Unable to locate ASP page

No remote call being made

# ChildEBP RetAddr

00 01b1fe18 7c82783b ntdll!KiFastSystemCallRet

01 01b1fe1c 77c885ac ntdll!NtReplyWaitReceivePortEx+0xc

02 01b1ff84 77c88792 RPCRT4!LRPC_ADDRESS::ReceiveLotsaCalls+0x198

03 01b1ff8c 77c8872d RPCRT4!RecvLotsaCallsWrapper+0xd

04 01b1ffac 77c7b110 RPCRT4!BaseCachedThreadRoutine+0x9d

05 01b1ffb8 77e64829 RPCRT4!ThreadStartRoutine+0x1b

06 01b1ffec 00000000 kernel32!BaseThreadStart+0x34

Thread ID: 11

System Thread ID: 19ac

Kernel Time: 0:0:0.0

User Time: 0:0:0.0

Thread Type: Other

# ChildEBP RetAddr

00 01b5ff8c 7c826f4b ntdll!KiFastSystemCallRet

01 01b5ff90 7c81943a ntdll!NtDelayExecution+0xc

02 01b5ffb8 77e64829 ntdll!RtlpIOWorkerThread+0x3f

03 01b5ffec 00000000 kernel32!BaseThreadStart+0x34

Thread ID: 12

System Thread ID: b24

Kernel Time: 0:0:0.0

User Time: 0:0:0.0

Thread Status: Thread is in a WAIT state.

Thread Type: ASP

Executing Page: Unable to locate ASP page

# ChildEBP RetAddr

00 0275ff0c 7c827d0b ntdll!KiFastSystemCallRet

01 0275ff10 77e61d1e ntdll!NtWaitForSingleObject+0xc

02 0275ff80 77e61c8d kernel32!WaitForSingleObjectEx+0xac

03 0275ff94 709fc803 kernel32!WaitForSingleObject+0x12

04 0275ffb4 709fc7db asp!CApplnCleanupMgr::ApplnCleanupDoWork+0x1e

05 0275ffb8 77e64829 asp!CApplnCleanupMgr::ApplnCleanupThread+0xa

06 0275ffec 00000000 kernel32!BaseThreadStart+0x34

Thread ID: 13

System Thread ID: 1d64

Kernel Time: 0:0:0.0

User Time: 0:0:0.0

Thread Status: Thread is in a WAIT state.

Thread Type: ASP

Executing Page: Unable to locate ASP page

# ChildEBP RetAddr

00 02a1fe1c 7c827cfb ntdll!KiFastSystemCallRet

01 02a1fe20 77e6202c ntdll!NtWaitForMultipleObjects+0xc

02 02a1fec8 7739bbd1 kernel32!WaitForMultipleObjectsEx+0x11a

03 02a1ff24 7739ce36 USER32!RealMsgWaitForMultipleObjectsEx+0x141

04 02a1ff40 709fb8be USER32!MsgWaitForMultipleObjects+0x1f

05 02a1ff84 77bcb530 asp!CMTACallbackThread::Thread+0x4f

06 02a1ffb8 77e64829 msvcrt!_endthreadex+0xa3

07 02a1ffec 00000000 kernel32!BaseThreadStart+0x34

Thread ID: 14

System Thread ID: ba4

Kernel Time: 0:0:0.0

User Time: 0:0:0.0

Thread Status: Thread is in a WAIT state.

Thread Type: ASP

Executing Page: Unable to locate ASP page

# ChildEBP RetAddr

00 0318fef4 7c827d0b ntdll!KiFastSystemCallRet

01 0318fef8 77e61d1e ntdll!NtWaitForSingleObject+0xc

02 0318ff68 77e61c8d kernel32!WaitForSingleObjectEx+0xac

03 0318ff7c 709fe8ef kernel32!WaitForSingleObject+0x12

04 0318ffb8 77e64829 asp!CViperReqManager::WatchThread+0x68

05 0318ffec 00000000 kernel32!BaseThreadStart+0x34

Thread ID: 15

System Thread ID: 15e0

Kernel Time: 0:0:0.0

User Time: 0:0:0.0

Thread Status: Thread is in a WAIT state.

Thread Type: Idle ASP thread

# ChildEBP RetAddr

00 0321fee8 7c827d0b ntdll!KiFastSystemCallRet

01 0321feec 77e61d1e ntdll!NtWaitForSingleObject+0xc

02 0321ff5c 77e61c8d kernel32!WaitForSingleObjectEx+0xac

03 0321ff70 4a77921b kernel32!WaitForSingleObject+0x12

04 0321ff84 77bcb530 comsvcs!CSTAThreadPool::LoadBalanceThreadControlLoop+0x29

05 0321ffb8 77e64829 msvcrt!_endthreadex+0xa3

06 0321ffec 00000000 kernel32!BaseThreadStart+0x34

Thread ID: 16

System Thread ID: 156c

Kernel Time: 0:0:0.0

User Time: 0:0:0.0

Thread Status: Thread is in a WAIT state.

Thread Type: Idle ASP thread

# ChildEBP RetAddr

00 0325fee0 7c827d0b ntdll!KiFastSystemCallRet

01 0325fee4 77e61d1e ntdll!NtWaitForSingleObject+0xc

02 0325ff54 77e61c8d kernel32!WaitForSingleObjectEx+0xac

03 0325ff68 4a778cb6 kernel32!WaitForSingleObject+0x12

04 0325ff84 77bcb530 comsvcs!CSTAThreadPool::KillThreadControlLoop+0x25

05 0325ffb8 77e64829 msvcrt!_endthreadex+0xa3

06 0325ffec 00000000 kernel32!BaseThreadStart+0x34

Thread ID: 17

System Thread ID: f2c

Kernel Time: 0:0:0.78

User Time: 0:0:0.328

Thread Status: Thread is in a WAIT state.

Thread Type: Idle ASP thread

# ChildEBP RetAddr

00 0329fdcc 7c827cfb ntdll!KiFastSystemCallRet

01 0329fdd0 77e6202c ntdll!NtWaitForMultipleObjects+0xc

02 0329fe78 7739bbd1 kernel32!WaitForMultipleObjectsEx+0x11a

03 0329fed4 7739ce36 USER32!RealMsgWaitForMultipleObjectsEx+0x141

04 0329fef0 4a77cb28 USER32!MsgWaitForMultipleObjects+0x1f

05 0329ff84 77bcb530 comsvcs!CSTAThread::WorkerLoop+0x1f9

06 0329ffb8 77e64829 msvcrt!_endthreadex+0xa3

07 0329ffec 00000000 kernel32!BaseThreadStart+0x34

Thread ID: 18

System Thread ID: 1ab0

Kernel Time: 0:0:3.406

User Time: 0:0:25.843

*** WARNING: Unable to verify checksum for C:\WINDOWS\assembly\NativeImages_v2.0.50727_32\System.DirectorySer#\54bf4abd12c4a168968605947cbd7006\System.DirectoryServices.ni.dll

Thread Type: Other

# ChildEBP RetAddr

00 0336c430 76f17bbc WLDAP32!DrainWinsock+0x116

01 0336c47c 76f19f1c WLDAP32!LdapWaitForResponseFromServer+0x2e0

02 0336c804 76f19cf5 WLDAP32!LdapExchangeOpaqueToken+0x363

03 0336c8bc 76f1993f WLDAP32!LdapSspiBind+0x372

04 0336cc6c 76f1a5cc WLDAP32!LdapBind+0x3a2

05 0336cc94 76dc467d WLDAP32!ldap_bind_sW+0x2c

06 0336cce0 76dc4410 adsldpc!LdapBindS+0xe4

07 0336cd0c 76dc42fe adsldpc!LdapOpenBindWithDefaultCredentials+0x18d

08 0336d174 76dc379f adsldpc!LdapOpenObject2+0x128

09 0336d194 712d3e32 adsldpc!LdapOpenObject+0x1b

0a 0336d1c4 712d3d6d adsldp!CLDAPRootDSE::CreateRootDSE+0x97

0b 0336d1f4 712d4828 adsldp!GetRootDSEObject+0x51

0c 0336d468 712d284c adsldp!GetServerBasedObject+0x11b

0d 0336d8c0 712d52f3 adsldp!GetObjectW+0x69

0e 0336d8ec 76df1bbb adsldp!CLDAPNamespace::OpenDSObject+0x34

0f 0336d944 03c5bf9c activeds!ADsOpenObject+0xb2

WARNING: Frame IP not in any known module. Following frames may be wrong.

10 0336d9e4 67170d73 0x3c5bf9c

11 0336da40 671663ae System_DirectoryServices_ni+0x10d73

12 0336daa8 67166245 System_DirectoryServices_ni+0x63ae

13 0336dab8 67165870 System_DirectoryServices_ni+0x6245

14 0336dac8 6716d0fa System_DirectoryServices_ni+0x5870

15 04d1101c 03dba1d8 System_DirectoryServices_ni+0xd0fa

16 03dcb004 00000001 0x3dba1d8

Thread ID: 19

System Thread ID: 12d4

Kernel Time: 0:0:0.78

User Time: 0:0:0.234

Thread Status: Thread is in a WAIT

***********************

More information about my system

Machine: windows 2003 SP2

IIS: IIS 6

Application: classical ASP application using C# COM object to query the LDAP server. C# code is using System.DirectoryServices library and is running under .Net 2.0 framework.

I will really appreciate your help.

Thanks,

Sushil

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LDAP IIS 6 Problem