Catch expected exception when reading info out of a PDB (#76182)

src/Features/Core/Portable/FeaturesResources.resx

@@ -3189,4 +3189,7 @@ Zero-width positive lookbehind assertions are typically used at the beginning of
   <data name="interface_name" xml:space="preserve">
     <value>&lt;interface name&gt;</value>
   </data>
+  <data name="Unable_to_create_0" xml:space="preserve">
+    <value>Unable to create '{0}'</value>
+  </data>
 </root>

src/Features/Core/Portable/MetadataAsSource/DecompilationMetadataAsSourceFileProvider.cs

@@ -15,7 +15,6 @@
 using System.Threading.Tasks;
 using Microsoft.CodeAnalysis.DecompiledSource;
 using Microsoft.CodeAnalysis.ErrorReporting;
-using Microsoft.CodeAnalysis.Formatting;
 using Microsoft.CodeAnalysis.Host;
 using Microsoft.CodeAnalysis.Host.Mef;
 using Microsoft.CodeAnalysis.PdbSourceDocument;
@@ -171,34 +170,26 @@ internal sealed class DecompilationMetadataAsSourceFileProvider(IImplementationA
             var timeout = TimeSpan.FromSeconds(5);
             var firstAttempt = true;
             var skipWritingFile = false;
-            while (!Directory.Exists(directoryToCreate))
+
+            while (!IOUtilities.PerformIO(() => Directory.Exists(directoryToCreate)))
             {
-                if (stopwatch.Elapsed > TimeSpan.FromSeconds(5))
+                if (stopwatch.Elapsed > timeout)
                 {
                     // If we still can't create the folder after 5 seconds, assume we will not be able to create it.
                     skipWritingFile = true;
                     break;
                 }
 
-                try
+                if (firstAttempt)
                 {
-                    if (firstAttempt)
-                    {
-                        firstAttempt = false;
-                    }
-                    else
-                    {
-                        await Task.Delay(DelayTimeSpan.Short, cancellationToken).ConfigureAwait(false);
-                    }
-
-                    Directory.CreateDirectory(directoryToCreate);
+                    firstAttempt = false;
                 }
-                catch (DirectoryNotFoundException)
-                {
-                }
-                catch (UnauthorizedAccessException)
+                else
                 {
+                    await Task.Delay(DelayTimeSpan.Short, cancellationToken).ConfigureAwait(false);
                 }
+
+                IOUtilities.PerformIO(() => Directory.CreateDirectory(directoryToCreate));
             }
 
             if (!skipWritingFile)

src/Features/Core/Portable/PdbSourceDocument/PdbSourceDocumentMetadataAsSourceFileProvider.cs

@@ -14,6 +14,7 @@
 using System.Text;
 using System.Threading;
 using System.Threading.Tasks;
+using Microsoft.CodeAnalysis.ErrorReporting;
 using Microsoft.CodeAnalysis.Formatting;
 using Microsoft.CodeAnalysis.Host;
 using Microsoft.CodeAnalysis.Host.Mef;
@@ -178,9 +179,11 @@ internal sealed class PdbSourceDocumentMetadataAsSourceFileProvider(
 
         ImmutableDictionary<string, string> pdbCompilationOptions;
         ImmutableArray<SourceDocument> sourceDocuments;
-        // We know we have a DLL, call and see if we can find metadata readers for it, and for the PDB (whereever it may be)
-        using (var documentDebugInfoReader = await _pdbFileLocatorService.GetDocumentDebugInfoReaderAsync(dllPath, options.AlwaysUseDefaultSymbolServers, telemetryMessage, cancellationToken).ConfigureAwait(false))
+
+        try
         {
+            // We know we have a DLL, call and see if we can find metadata readers for it, and for the PDB (wherever it may be)
+            using var documentDebugInfoReader = await _pdbFileLocatorService.GetDocumentDebugInfoReaderAsync(dllPath, options.AlwaysUseDefaultSymbolServers, telemetryMessage, cancellationToken).ConfigureAwait(false);
             if (documentDebugInfoReader is null)
                 return null;
 
@@ -191,11 +194,17 @@ internal sealed class PdbSourceDocumentMetadataAsSourceFileProvider(
 
             // Try to find some actual document information from the PDB
             sourceDocuments = documentDebugInfoReader.FindSourceDocuments(handle);
-            if (sourceDocuments.Length == 0)
-            {
-                _logger?.Log(FeaturesResources.No_source_document_info_found_in_PDB);
-                return null;
-            }
+        }
+        catch (BadImageFormatException ex) when (FatalError.ReportAndCatch(ex))
+        {
+            _logger?.Log(ex.Message);
+            return null;
+        }
+
+        if (sourceDocuments.Length == 0)
+        {
+            _logger?.Log(FeaturesResources.No_source_document_info_found_in_PDB);
+            return null;
         }
 
         Encoding? defaultEncoding = null;
@@ -227,14 +236,18 @@ internal sealed class PdbSourceDocumentMetadataAsSourceFileProvider(
         }
 
         var tempFilePath = Path.Combine(tempPath, projectId.Id.ToString());
+
         // Create the directory. It's possible a parallel deletion is happening in another process, so we may have
         // to retry this a few times.
         var loopCount = 0;
         while (!Directory.Exists(tempFilePath))
         {
             // Protect against infinite loops.
             if (loopCount++ > 10)
+            {
+                _logger?.Log(FeaturesResources.Unable_to_create_0, tempFilePath);
                 return null;
+            }
 
             IOUtilities.PerformIO(() => Directory.CreateDirectory(tempFilePath));
         }