SIGSEGV Crash on run

[domstoppable]

• OS: Debian (Bullseye) Linux
• Unreal Version: 4.24.2 (clean source build)
• KantanDocGenPlugin version: master/head

The plugin crashes (SIGSEGV) when generating documentation for my project on
NodeDocsGenerator.cpp:181. The next time I boot into Windows I will attempt to replicate there.

KantanDocGenPlugin/Source/KantanDocGen/Private/NodeDocsGenerator.cpp

Line 181 in 37c5be2

if(RTResource->ReadPixelsPtr(PixelData->Pixels.GetData(), ReadPixelFlags, Rect) == false)

Call stack:

___lldb_unnamed_symbol1220$$libc.so.6 (@___lldb_unnamed_symbol1220$$libc.so.6:115)
FGenericPlatformMemory::Memcpy(void*, void const*, unsigned long) (/home/dom/code/UnrealEngine/Engine/Source/Runtime/Core/Public/GenericPlatform/GenericPlatformMemory.h:470)
FMemory::Memcpy(void*, void const*, unsigned long) (/home/dom/code/UnrealEngine/Engine/Source/Runtime/Core/Public/HAL/UnrealMemory.h:124)
FRenderTarget::ReadPixelsPtr(FColor*, FReadSurfaceDataFlags, FIntRect) (/home/dom/code/UnrealEngine/Engine/Source/Runtime/Engine/Private/UnrealClient.cpp:101)
FNodeDocsGenerator::GenerateNodeImage(UEdGraphNode*, FNodeDocsGenerator::FNodeProcessingState&)::$_12::operator()() const (/home/dom/code/Psydekick/PKDev/Plugins/KantanDocGenPlugin/Source/KantanDocGen/Private/NodeDocsGenerator.cpp:181)
decltype(fp(fp0...)) DocGenThreads::RunOnGameThreadRetVal<FNodeDocsGenerator::GenerateNodeImage(UEdGraphNode*, FNodeDocsGenerator::FNodeProcessingState&)::$_12>(FNodeDocsGenerator::GenerateNodeImage(UEdGraphNode*, FNodeDocsGenerator::FNodeProcessingState&)::$_12)::'lambda'()::operator()() const (/home/dom/code/Psydekick/PKDev/Plugins/KantanDocGenPlugin/Source/KantanDocGen/Private/ThreadingHelpers.h:30)
decltype(Forward<FNodeDocsGenerator::GenerateNodeImage(UEdGraphNode*, FNodeDocsGenerator::FNodeProcessingState&)::$_12>(fp)()) Invoke<decltype(fp(fp0...)) DocGenThreads::RunOnGameThreadRetVal<FNodeDocsGenerator::GenerateNodeImage(UEdGraphNode*, FNodeDocsGenerator::FNodeProcessingState&)::$_12>(FNodeDocsGenerator::GenerateNodeImage(UEdGraphNode*, FNodeDocsGenerator::FNodeProcessingState&)::$_12)::'lambda'()&>(FNodeDocsGenerator::GenerateNodeImage(UEdGraphNode*, FNodeDocsGenerator::FNodeProcessingState&)::$_12&&) (/home/dom/code/UnrealEngine/Engine/Source/Runtime/Core/Public/Templates/Invoke.h:45)
UE4Function_Private::TFunctionRefCaller<decltype(fp(fp0...)) DocGenThreads::RunOnGameThreadRetVal<FNodeDocsGenerator::GenerateNodeImage(UEdGraphNode*, FNodeDocsGenerator::FNodeProcessingState&)::$_12>(FNodeDocsGenerator::GenerateNodeImage(UEdGraphNode*, FNodeDocsGenerator::FNodeProcessingState&)::$_12)::'lambda'(), void ()>::Call(void*) (/home/dom/code/UnrealEngine/Engine/Source/Runtime/Core/Public/Templates/Function.h:548)
UE4Function_Private::TFunctionRefBase<UE4Function_Private::TFunctionStorage<true>, void ()>::operator()() const (/home/dom/code/UnrealEngine/Engine/Source/Runtime/Core/Public/Templates/Function.h:676)
FFunctionGraphTask::DoTask(ENamedThreads::Type, TRefCountPtr<FGraphEvent> const&) (/home/dom/code/UnrealEngine/Engine/Source/Runtime/Core/Public/Async/TaskGraphInterfaces.h:1305)
TGraphTask<FFunctionGraphTask>::ExecuteTask(TArray<FBaseGraphTask*, TSizedDefaultAllocator<32> >&, ENamedThreads::Type) (/home/dom/code/UnrealEngine/Engine/Source/Runtime/Core/Public/Async/TaskGraphInterfaces.h:847)
FBaseGraphTask::Execute(TArray<FBaseGraphTask*, TSizedDefaultAllocator<32> >&, ENamedThreads::Type) (/home/dom/code/UnrealEngine/Engine/Source/Runtime/Core/Public/Async/TaskGraphInterfaces.h:514)
FNamedTaskThread::ProcessTasksNamedThread(int, bool) (/home/dom/code/UnrealEngine/Engine/Source/Runtime/Core/Private/Async/TaskGraph.cpp:686)
FNamedTaskThread::ProcessTasksUntilQuit(int) (/home/dom/code/UnrealEngine/Engine/Source/Runtime/Core/Private/Async/TaskGraph.cpp:582)
FTaskGraphImplementation::WaitUntilTasksComplete(TArray<TRefCountPtr<FGraphEvent>, TInlineAllocator<4u, TSizedDefaultAllocator<32> > > const&, ENamedThreads::Type) (/home/dom/code/UnrealEngine/Engine/Source/Runtime/Core/Private/Async/TaskGraph.cpp:1463)
FTickTaskSequencer::ReleaseTickGroup(ETickingGroup, bool) (/home/dom/code/UnrealEngine/Engine/Source/Runtime/Engine/Private/TickTaskManager.cpp:559)
FTickTaskManager::RunTickGroup(ETickingGroup, bool) (/home/dom/code/UnrealEngine/Engine/Source/Runtime/Engine/Private/TickTaskManager.cpp:1527)
UWorld::RunTickGroup(ETickingGroup, bool) (/home/dom/code/UnrealEngine/Engine/Source/Runtime/Engine/Private/LevelTick.cpp:781)
UWorld::Tick(ELevelTick, float) (/home/dom/code/UnrealEngine/Engine/Source/Runtime/Engine/Private/LevelTick.cpp:1552)
UEditorEngine::Tick(float, bool) (/home/dom/code/UnrealEngine/Engine/Source/Editor/UnrealEd/Private/EditorEngine.cpp:1504)

I'm excited to make use of this plugin for documenting my own open source plugin, so whatever I can do to help troubleshoot, please let me know :)

[domstoppable]

Just realized you have a 4.24 branch, which runs perfectly fine for me in Windows. It fails in Linux, even after wrapping the call to KantanDocGen.exe to my installation of mono:

mono Plugins/KantanDocGenPlugin/ThirdParty/KantanDocGenTool/bin/KantanDocGen.exe -outputdir="Saved/KantanDocGen" -fromintermediate -intermediatedir="Intermediate/KantanDocGen/MyProject_Documentation" -name=MyProject_Documentation -cleanoutput
KantanDocGen invoked with arguments:
-outputdir=Saved/KantanDocGen
-fromintermediate
-intermediatedir=Intermediate/KantanDocGen/MyProject_Documentation
-name=MyProject_Documentation
-cleanoutput

Unhandled Exception:
System.TypeInitializationException: The type initializer for 'net.sf.saxon.regex.Categories' threw an exception. ---> System.TypeLoadException: Could not load type of field 'java.util.jar.JarVerifier+VerifierStream:mev' (2) due to: Could not load file or assembly 'IKVM.OpenJDK.Security, Version=7.2.4630.5, Culture=neutral, PublicKeyToken=13235d27fcbfff58' or one of its dependencies.
  at (wrapper synchronized) java.util.jar.JarFile.getInputStream(java.util.zip.ZipEntry)
  at sun.net.www.protocol.jar.JarURLConnection.getInputStream () [0x0006c] in <e558e0fcf22f4da6ae0339343959f352>:0 
  at java.net.URL.openStream () [0x00006] in <e558e0fcf22f4da6ae0339343959f352>:0 
  at java.lang.ClassLoader.getResourceAsStream (System.String name) [0x0000b] in <e558e0fcf22f4da6ae0339343959f352>:0 
  at net.sf.saxon.Configuration.locateResource (System.String filename, java.util.List messages, java.util.List loaders) [0x0009a] in <9168faa572294178a78340feb77a0558>:0 
  at net.sf.saxon.regex.Categories.build () [0x0001b] in <9168faa572294178a78340feb77a0558>:0 
  at net.sf.saxon.regex.Categories.getCategory (System.String cat) [0x00007] in <9168faa572294178a78340feb77a0558>:0 
  at net.sf.saxon.regex.Categories..cctor () [0x00067] in <9168faa572294178a78340feb77a0558>:0 
   --- End of inner exception stack trace ---
  at (wrapper managed-to-native) System.Object.__icall_wrapper_mono_generic_class_init(intptr)
  at net.sf.saxon.regex.RECompiler.escape (System.Boolean ) [0x00213] in <9168faa572294178a78340feb77a0558>:0 
  at net.sf.saxon.regex.RECompiler.parseTerminal (System.Int32[] ) [0x0019d] in <9168faa572294178a78340feb77a0558>:0 
  at net.sf.saxon.regex.RECompiler.piece (System.Int32[] ) [0x0000b] in <9168faa572294178a78340feb77a0558>:0 
  at net.sf.saxon.regex.RECompiler.parseBranch () [0x00045] in <9168faa572294178a78340feb77a0558>:0 
  at net.sf.saxon.regex.RECompiler.parseExpr (System.Int32[] ) [0x000d8] in <9168faa572294178a78340feb77a0558>:0 
  at net.sf.saxon.regex.RECompiler.compile (net.sf.saxon.regex.UnicodeString pattern) [0x0017a] in <9168faa572294178a78340feb77a0558>:0 
  at net.sf.saxon.regex.ARegularExpression..ctor (java.lang.CharSequence pattern, System.String flags, System.String hostLanguage, java.util.List warnings) [0x0007d] in <9168faa572294178a78340feb77a0558>:0 
  at net.sf.saxon.dotnet.DotNetPlatform.compileRegularExpression (java.lang.CharSequence regex, System.String flags, System.String hostLanguage, java.util.List warnings) [0x000bd] in <9168faa572294178a78340feb77a0558>:0 
  at net.sf.saxon.functions.RegexFunction.tryToBindRegularExpression (net.sf.saxon.expr.Expression[] ) [0x00098] in <9168faa572294178a78340feb77a0558>:0 
  at net.sf.saxon.functions.RegexFunction.makeFunctionCall (net.sf.saxon.expr.Expression[] arguments) [0x00000] in <9168faa572294178a78340feb77a0558>:0 
  at net.sf.saxon.functions.RegexFunctionSansFlags.makeFunctionCall (net.sf.saxon.expr.Expression[] arguments) [0x0003a] in <9168faa572294178a78340feb77a0558>:0 
  at net.sf.saxon.functions.SystemFunction.makeCall (System.String name, net.sf.saxon.expr.parser.RetainedStaticContext rsc, net.sf.saxon.expr.Expression[] arguments) [0x0000f] in <9168faa572294178a78340feb77a0558>:0 
  at net.sf.saxon.trans.KeyManager.registerIdrefKey (net.sf.saxon.Configuration ) [0x00097] in <9168faa572294178a78340feb77a0558>:0 
  at net.sf.saxon.trans.KeyManager..ctor (net.sf.saxon.Configuration config, net.sf.saxon.expr.PackageData pack) [0x00029] in <9168faa572294178a78340feb77a0558>:0 
  at net.sf.saxon.expr.PackageData.getKeyManager () [0x00014] in <9168faa572294178a78340feb77a0558>:0 
  at net.sf.saxon.style.PrincipalStylesheetModule..ctor (net.sf.saxon.style.XSLPackage sourceElement) [0x000da] in <9168faa572294178a78340feb77a0558>:0 
  at net.sf.saxon.style.StyleNodeFactory.newPrincipalModule (net.sf.saxon.style.XSLPackage node) [0x00000] in <9168faa572294178a78340feb77a0558>:0 
  at net.sf.saxon.style.Compilation.compilePackage (javax.xml.transform.Source source) [0x00112] in <9168faa572294178a78340feb77a0558>:0 
  at net.sf.saxon.style.StylesheetModule.loadStylesheet (javax.xml.transform.Source styleSource, net.sf.saxon.style.Compilation compilation) [0x002a6] in <9168faa572294178a78340feb77a0558>:0 
  at net.sf.saxon.style.Compilation.compileSingletonPackage (net.sf.saxon.Configuration config, net.sf.saxon.trans.CompilerInfo compilerInfo, javax.xml.transform.Source source) [0x00008] in <9168faa572294178a78340feb77a0558>:0 
  at Saxon.Api.XsltCompiler.Compile (System.IO.Stream input, System.String theBaseUri, System.Boolean closeStream) [0x00074] in <ba467b97b7ed4d519aa056a68944b156>:0 
  at Saxon.Api.XsltCompiler.Compile (System.Uri uri) [0x0003b] in <ba467b97b7ed4d519aa056a68944b156>:0 
  at KantanDocGen.SaxonXform.Initialize (System.String XsltPath, System.Diagnostics.DataReceivedEventHandler OutputHandler) [0x0001c] in <95666dac66d041d38b715c2fe0a241ea>:0 
  at KantanDocGen.Program.Main (System.String[] args) [0x00175] in <95666dac66d041d38b715c2fe0a241ea>:0 
[ERROR] FATAL UNHANDLED EXCEPTION: System.TypeInitializationException: The type initializer for 'net.sf.saxon.regex.Categories' threw an exception. ---> System.TypeLoadException: Could not load type of field 'java.util.jar.JarVerifier+VerifierStream:mev' (2) due to: Could not load file or assembly 'IKVM.OpenJDK.Security, Version=7.2.4630.5, Culture=neutral, PublicKeyToken=13235d27fcbfff58' or one of its dependencies.
  at (wrapper synchronized) java.util.jar.JarFile.getInputStream(java.util.zip.ZipEntry)
  at sun.net.www.protocol.jar.JarURLConnection.getInputStream () [0x0006c] in <e558e0fcf22f4da6ae0339343959f352>:0 
  at java.net.URL.openStream () [0x00006] in <e558e0fcf22f4da6ae0339343959f352>:0 
  at java.lang.ClassLoader.getResourceAsStream (System.String name) [0x0000b] in <e558e0fcf22f4da6ae0339343959f352>:0 
  at net.sf.saxon.Configuration.locateResource (System.String filename, java.util.List messages, java.util.List loaders) [0x0009a] in <9168faa572294178a78340feb77a0558>:0 
  at net.sf.saxon.regex.Categories.build () [0x0001b] in <9168faa572294178a78340feb77a0558>:0 
  at net.sf.saxon.regex.Categories.getCategory (System.String cat) [0x00007] in <9168faa572294178a78340feb77a0558>:0 
  at net.sf.saxon.regex.Categories..cctor () [0x00067] in <9168faa572294178a78340feb77a0558>:0 
   --- End of inner exception stack trace ---
  at (wrapper managed-to-native) System.Object.__icall_wrapper_mono_generic_class_init(intptr)
  at net.sf.saxon.regex.RECompiler.escape (System.Boolean ) [0x00213] in <9168faa572294178a78340feb77a0558>:0 
  at net.sf.saxon.regex.RECompiler.parseTerminal (System.Int32[] ) [0x0019d] in <9168faa572294178a78340feb77a0558>:0 
  at net.sf.saxon.regex.RECompiler.piece (System.Int32[] ) [0x0000b] in <9168faa572294178a78340feb77a0558>:0 
  at net.sf.saxon.regex.RECompiler.parseBranch () [0x00045] in <9168faa572294178a78340feb77a0558>:0 
  at net.sf.saxon.regex.RECompiler.parseExpr (System.Int32[] ) [0x000d8] in <9168faa572294178a78340feb77a0558>:0 
  at net.sf.saxon.regex.RECompiler.compile (net.sf.saxon.regex.UnicodeString pattern) [0x0017a] in <9168faa572294178a78340feb77a0558>:0 
  at net.sf.saxon.regex.ARegularExpression..ctor (java.lang.CharSequence pattern, System.String flags, System.String hostLanguage, java.util.List warnings) [0x0007d] in <9168faa572294178a78340feb77a0558>:0 
  at net.sf.saxon.dotnet.DotNetPlatform.compileRegularExpression (java.lang.CharSequence regex, System.String flags, System.String hostLanguage, java.util.List warnings) [0x000bd] in <9168faa572294178a78340feb77a0558>:0 
  at net.sf.saxon.functions.RegexFunction.tryToBindRegularExpression (net.sf.saxon.expr.Expression[] ) [0x00098] in <9168faa572294178a78340feb77a0558>:0 
  at net.sf.saxon.functions.RegexFunction.makeFunctionCall (net.sf.saxon.expr.Expression[] arguments) [0x00000] in <9168faa572294178a78340feb77a0558>:0 
  at net.sf.saxon.functions.RegexFunctionSansFlags.makeFunctionCall (net.sf.saxon.expr.Expression[] arguments) [0x0003a] in <9168faa572294178a78340feb77a0558>:0 
  at net.sf.saxon.functions.SystemFunction.makeCall (System.String name, net.sf.saxon.expr.parser.RetainedStaticContext rsc, net.sf.saxon.expr.Expression[] arguments) [0x0000f] in <9168faa572294178a78340feb77a0558>:0 
  at net.sf.saxon.trans.KeyManager.registerIdrefKey (net.sf.saxon.Configuration ) [0x00097] in <9168faa572294178a78340feb77a0558>:0 
  at net.sf.saxon.trans.KeyManager..ctor (net.sf.saxon.Configuration config, net.sf.saxon.expr.PackageData pack) [0x00029] in <9168faa572294178a78340feb77a0558>:0 
  at net.sf.saxon.expr.PackageData.getKeyManager () [0x00014] in <9168faa572294178a78340feb77a0558>:0 
  at net.sf.saxon.style.PrincipalStylesheetModule..ctor (net.sf.saxon.style.XSLPackage sourceElement) [0x000da] in <9168faa572294178a78340feb77a0558>:0 
  at net.sf.saxon.style.StyleNodeFactory.newPrincipalModule (net.sf.saxon.style.XSLPackage node) [0x00000] in <9168faa572294178a78340feb77a0558>:0 
  at net.sf.saxon.style.Compilation.compilePackage (javax.xml.transform.Source source) [0x00112] in <9168faa572294178a78340feb77a0558>:0 
  at net.sf.saxon.style.StylesheetModule.loadStylesheet (javax.xml.transform.Source styleSource, net.sf.saxon.style.Compilation compilation) [0x002a6] in <9168faa572294178a78340feb77a0558>:0 
  at net.sf.saxon.style.Compilation.compileSingletonPackage (net.sf.saxon.Configuration config, net.sf.saxon.trans.CompilerInfo compilerInfo, javax.xml.transform.Source source) [0x00008] in <9168faa572294178a78340feb77a0558>:0 
  at Saxon.Api.XsltCompiler.Compile (System.IO.Stream input, System.String theBaseUri, System.Boolean closeStream) [0x00074] in <ba467b97b7ed4d519aa056a68944b156>:0 
  at Saxon.Api.XsltCompiler.Compile (System.Uri uri) [0x0003b] in <ba467b97b7ed4d519aa056a68944b156>:0 
  at KantanDocGen.SaxonXform.Initialize (System.String XsltPath, System.Diagnostics.DataReceivedEventHandler OutputHandler) [0x0001c] in <95666dac66d041d38b715c2fe0a241ea>:0 
  at KantanDocGen.Program.Main (System.String[] args) [0x00175] in <95666dac66d041d38b715c2fe0a241ea>:0 

Ultimately I just needed a way to generate screenshots of the Blueprint nodes, and I have that now even without KantanDocGen.exe working. I will let you decide on whether to keep this ticket open if you'd like to better support Linux though. I'm still happy to help troubleshoot.

[kamrann]

Thanks for the info, but I'm afraid aside from not having any time, this is way out of my range of understanding. The exception is in the doc gen tool (source for that is in another repo also here on my Github), which is a C# app. It's packaged prebuilt with the plugin.

I have no experience with Linux or Mono, and very little with C# generally. My guess is that the important part is: Could not load file or assembly 'IKVM.OpenJDK.Security, Version=7.2.4630.5, Culture=neutral, PublicKeyToken=13235d27fcbfff58' or one of its dependencies.
It looks like a missing C# assembly dependency, but where that would fit in in terms of running via Mono, I have absolutely no idea.
If you wanted to investigate further, all I could suggest would be to see if you're able to build the doc gen tool repo from source under Mono, maybe that would give some pointers?