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POIIS 6.0 64-bit: SysInterals Proc Explorer showing 32-bit DLLs loaded?
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copied!<p>Trying to pin down an issue that is most likely due to our web application trying to load a 32-bit version of OracleAccess.dll when IIS is running as 64-bit (it looks like both 32-bit and 64-bit versions of the Oracle drivers may be installed side-by-side).</p> <p>I have two sites on the server, one for production, and one for test. The production one has code that was deployed by an employee who is no longer with us. That site works. The other site we've just deployed; it was compiled for <code>Any CPU</code>, and we get errors loading the Oracle drivers.</p> <p>If I view the IIS worker process for the production site in SysInternal's process explorer, highlight the IIS worker process, and view the loaded DLLs in the lower pane view, I see some strange data.</p> <p>Info for the worker process:</p> <pre><code>Process Version User Name PID Image Type w3wp.exe 6.0.3790.3959 NT AUTHORITY\NETWORK SERVICE 3320 64-bit </code></pre> <p>But in the list of DLLs that are loaded, some are listed as 64-bit images, and some are listed as 32-bit? It's not possible (AFAIK) to load 32-bit DLLs into a 64-bit process space, so maybe I'm not understanding the report I'm seeing.</p> <p>Subset of the DLL Handle info:</p> <pre><code>Name Image Type Description Company Name Version aspnet_filter.dll 64-bit Microsoft ASP.NET ISAPI Filter DLL Microsoft Corporation 4.0.30319.1 admwprox.dll 64-bit IIS Admin Com API Proxy dll Microsoft Corporation 6.0.3790.3959 adsldp.dll 64-bit ADs LDAP Provider DLL Microsoft Corporation 5.2.3790.3959 adsldpc.dll 64-bit ADs LDAP Provider C DLL Microsoft Corporation 5.2.3790.3959 advapi32.dll 64-bit Advanced Windows 32 Base API Microsoft Corporation 5.2.3790.4555 aspnet_filter.dll 64-bit Microsoft ASP.NET ISAPI Filter DLL Microsoft Corporation 4.0.30319.1 aspnet_isapi.dll 64-bit Microsoft ASP.NET ISAPI Shim DLL Microsoft Corporation 2.0.50727.3053 comctl32.dll 64-bit Common Controls Library Microsoft Corporation 5.82.3790.4770 comctl32.dll 64-bit User Experience Controls Library Microsoft Corporation 6.0.3790.4770 comres.dll 64-bit COM+ Resources Microsoft Corporation 2001.12.4720.3959 (Next few are our DLLs) CSA.Database.DLL 32-bit CSA.Database TE 1.7.8221.0 CSA.Database.DLL 32-bit CSA.Database TE 1.7.8221.0 CSA.Loggers.DLL 32-bit CSA.Loggers TE 1.7.8221.0 CSA.Loggers.DLL 32-bit CSA.Loggers TE 1.7.8221.0 CSA.Network.DLL 32-bit CSA.Network TE 1.7.8221.0 CSA.Network.DLL 32-bit CSA.Network TE 1.7.8221.0 Enterprise.Data.DLL 32-bit Enterprise.Data TE 2.35.3.0 Enterprise.Data.DLL 32-bit Enterprise.Data TE 2.35.3.0 Enterprise.Diagnostics.DLL 32-bit Enterprise.Diagnostics TE 2.35.3.0 Enterprise.Diagnostics.DLL 32-bit Enterprise.Diagnostics TE 2.35.3.0 (More Microsoft DLLs... some 32-bit, some 64-bit??) FederatedLibrary.DLL 32-bit FederatedLibrary Microsoft 1.0.0.0 FederatedLibrary.DLL 32-bit FederatedLibrary Microsoft 1.0.0.0 gdi32.dll 64-bit GDI Client DLL Microsoft Corporation 5.2.3790.4396 gzip.dll 64-bit GZIP Compressn DLL Microsoft Corporation 6.0.3790.1830 Microsoft.Practices.EnterpriseLibrary.Common.DLL 32-bit Enterprise Library Shared Library Microsoft Corporation 4.1.0.0 Microsoft.Practices.EnterpriseLibrary.Common.DLL 32-bit Enterprise Library Shared Library Microsoft Corporation 4.1.0.0 Microsoft.Practices.EnterpriseLibrary.ExceptionHandling.DLL 32-bit Enterprise Library Exception Handling Application Block Microsoft Corporation 4.1.0.0 Microsoft.Practices.EnterpriseLibrary.ExceptionHandling.DLL 32-bit Enterprise Library Exception Handling Application Block Microsoft Corporation 4.1.0.0 Microsoft.Practices.EnterpriseLibrary.Logging.DLL 32-bit Enterprise Library Logging Application Block Microsoft Corporation 4.1.0.0 Microsoft.Practices.EnterpriseLibrary.Logging.DLL 32-bit Enterprise Library Logging Application Block Microsoft Corporation 4.1.0.0 (And finally, the Oracle drivers that seem to be causing issue... 64-bit) oracle.dataaccess.dll 64-bit Oracle.DataAccess.dll Oracle Corporation 2.112.1.0 oracle.dataaccess.dll 64-bit Oracle.DataAccess.dll Oracle Corporation 2.112.1.0 </code></pre> <p>I've used <code>corflags</code> to see if the working, production DLLs were compiled explicitly for 32-bit... If I understand the output, they're not.</p> <pre><code>C:\SingleSignOn\bin>corflags CSA.Network.dll Microsoft (R) .NET Framework CorFlags Conversion Tool. Version 4.0.30319.1 Copyright (c) Microsoft Corporation. All rights reserved. Version : v2.0.50727 CLR Header: 2.5 PE : PE32 CorFlags : 1 ILONLY : 1 32BIT : 0 Signed : 0 </code></pre> <p><br /> The first step in understanding why our newly-compiled deployment doesn't work is to understand why the current one does. Can anyone explain to me what I'm seeing?</p> <p>What I need to know:</p> <ol> <li>Is IIS running as a 64-bit process, and will it load <code>Any CPU</code> DLLs as 64-bit?</li> <li>If yes, why are those DLLs listed by Process Explorer as 32-bit images?</li> <li>Is it possible for IIS to be loading 32-bit DLLs into a 64-bit process space?</li> <li>If IIS is a 64-bit process, and we load a website compiled as <code>Any CPU</code>, will it force 32-bit if any of the DLLs it depends on are 32-bit DLLs (e.g. it was compiled against a 32-bit version of the Oracle drivers?)</li> </ol> <p>Thanks in advance...</p>

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