Fix ProcessLoader stale PID validation against kernel process table (#102)

This PR adresses the following issue : `ProcessLoader.ActiveApplication` could return invalid results when `_latestPid` pointed to a process that no longer existed in the kernel's process table. The original exception path was commented out and bypassed (by sh0inx?) with `GetValueOrDefault` to prevent UI lockups, but this only resolved the symptoms without fixing the root cause.

This was due to sevral factors :
- `_latestPid` was never reset or validated against the actual process state
- ProcessLoader maintained its own `_processesByPid` dictionary separate from the kernel's `KernelContext.Processes`
- No cleanups happened when processes exited or were terminated
- ProcessLoader state could drift out of sync with the kernel process table

**Solution/Fixes**
- Validate` _latestPid` against the kernel process table before returning `ActiveApplication`
- Check process state (Exited/Exiting) and automatically clear stale references
- Add thread-safe cleanup methods (`ClearProcess`, `ClearAllProcesses`)
- Integrate `ClearAllProcesses` into Switch.Dispose for proper shutdown cleanup
- Add warning logs when stale PID is detected and cleared for debugging

**Code Changes**:
- `ProcessLoader.cs`: Add `_pidLock`, update `ActiveApplication` with validation, add cleanup methods
- `Switch.cs`: Call `Processes.ClearAllProcesses()` in Dispose()

Reviewed-on: https://git.ryujinx.app/projects/Ryubing/pulls/102

Directory.Packages.props

@@ -8,7 +8,7 @@
     <PackageVersion Include="Avalonia.Desktop" Version="11.3.15" />
     <PackageVersion Include="Avalonia.Diagnostics" Version="11.3.15" />
     <PackageVersion Include="Avalonia.Markup.Xaml.Loader" Version="11.3.15" />
-    <PackageVersion Include="SharpCompress" Version="0.48.0" />
+    <PackageVersion Include="SharpCompress" Version="0.48.1" />
     <PackageVersion Include="Svg.Controls.Avalonia" Version="11.3.9.5" />
     <PackageVersion Include="Svg.Controls.Skia.Avalonia" Version="11.3.9.5" />
     <PackageVersion Include="Microsoft.Build.Framework" Version="17.11.4" />
@@ -51,7 +51,7 @@
     <PackageVersion Include="Ryujinx.Systems.Update.Common" Version="2.0.6" />
     <PackageVersion Include="Gommon" Version="2.8.1.2" />
     <PackageVersion Include="securifybv.ShellLink" Version="0.1.0" />
-    <PackageVersion Include="Sep" Version="0.13.0" />
+    <PackageVersion Include="Sep" Version="0.14.1" />
     <PackageVersion Include="shaderc.net" Version="0.1.0" />
     <PackageVersion Include="Silk.NET.Vulkan" Version="2.22.0" />
     <PackageVersion Include="Silk.NET.Vulkan.Extensions.EXT" Version="2.22.0" />

assets/Locales/Root.json

@@ -596,7 +596,7 @@
         "th_TH": "",
         "tr_TR": "",
         "uk_UA": "",
-        "zh_CN": "",
+        "zh_CN": "重启模拟",
         "zh_TW": "重新啟動模擬"
       }
     },
@@ -6121,7 +6121,7 @@
         "th_TH": "",
         "tr_TR": "",
         "uk_UA": "",
-        "zh_CN": "",
+        "zh_CN": "开启网络日志",
         "zh_TW": ""
       }
     },
@@ -11371,7 +11371,7 @@
         "th_TH": "",
         "tr_TR": "",
         "uk_UA": "",
-        "zh_CN": "",
+        "zh_CN": "保存",
         "zh_TW": "儲存"
       }
     },
@@ -17121,7 +17121,7 @@
         "th_TH": "",
         "tr_TR": "",
         "uk_UA": "",
-        "zh_CN": "",
+        "zh_CN": "在控制台中显示网络日志",
         "zh_TW": ""
       }
     },
@@ -21496,7 +21496,7 @@
         "th_TH": "",
         "tr_TR": "",
         "uk_UA": "",
-        "zh_CN": "",
+        "zh_CN": "控制台将会在下次启动 Ryujinx 时可用。",
         "zh_TW": ""
       }
     },

src/Ryujinx.Graphics.Shader/CodeGen/Spirv/CodeGenContext.cs

@@ -82,6 +82,7 @@ namespace Ryujinx.Graphics.Shader.CodeGen.Spirv
 
         public bool IsMainFunction { get; private set; }
         public bool MayHaveReturned { get; set; }
+        public bool WasNonUniformAccessDeclared { get; set; }
 
         public CodeGenContext(
             StructuredProgramInfo info,
@@ -89,6 +90,8 @@ namespace Ryujinx.Graphics.Shader.CodeGen.Spirv
             GeneratorPool<Instruction> instPool,
             GeneratorPool<LiteralInteger> integerPool) : base(SpirvVersionPacked, instPool, integerPool)
         {
+            WasNonUniformAccessDeclared = false;
+
             Info = info;
             AttributeUsage = parameters.AttributeUsage;
             Definitions = parameters.Definitions;

src/Ryujinx.Graphics.Shader/CodeGen/Spirv/Instructions.cs

@@ -591,7 +591,16 @@ namespace Ryujinx.Graphics.Shader.CodeGen.Spirv
         {
             if (context.HostCapabilities.SupportsShaderNonUniformIndexing)
             {
+                if (!context.WasNonUniformAccessDeclared)
+                {
+                    context.AddExtension("SPV_EXT_descriptor_indexing");
+                    context.AddCapability(Capability.ShaderNonUniform);
+                    context.AddCapability(Capability.SampledImageArrayNonUniformIndexing);
+                    context.AddCapability(Capability.StorageImageArrayNonUniformIndexing);
+                }
+
                 context.Decorate(inst, Decoration.NonUniform);
+                context.WasNonUniformAccessDeclared = true;
             }
         }
 

src/Ryujinx.Graphics.Shader/CodeGen/Spirv/SpirvGenerator.cs

@@ -60,14 +60,6 @@ namespace Ryujinx.Graphics.Shader.CodeGen.Spirv
                 context.AddCapability(Capability.Float64);
             }
 
-            if (parameters.HostCapabilities.SupportsShaderNonUniformIndexing)
-            {
-                context.AddExtension("SPV_EXT_descriptor_indexing");
-                context.AddCapability(Capability.ShaderNonUniform);
-                context.AddCapability(Capability.SampledImageArrayNonUniformIndexing);
-                context.AddCapability(Capability.StorageImageArrayNonUniformIndexing);
-            }
-
             if (parameters.Definitions.TransformFeedbackEnabled && parameters.Definitions.LastInVertexPipeline)
             {
                 context.AddCapability(Capability.TransformFeedback);

src/Ryujinx.Graphics.Vulkan/BarrierBatch.cs

@@ -46,7 +46,14 @@ namespace Ryujinx.Graphics.Vulkan
 
         public static (AccessFlags Access, PipelineStageFlags Stages) GetSubpassAccessSuperset(VulkanRenderer gd)
         {
-            AccessFlags access = BufferAccess;
+            AccessFlags access = BufferAccess |
+                AccessFlags.ShaderReadBit |
+                AccessFlags.ShaderWriteBit |
+                AccessFlags.ColorAttachmentReadBit |
+                AccessFlags.ColorAttachmentWriteBit |
+                AccessFlags.DepthStencilAttachmentReadBit |
+                AccessFlags.DepthStencilAttachmentWriteBit;
+
             PipelineStageFlags stages = PipelineStageFlags.AllGraphicsBit;
 
             if (gd.TransformFeedbackApi != null)

src/Ryujinx.Graphics.Vulkan/TextureCopy.cs

@@ -15,6 +15,8 @@ namespace Ryujinx.Graphics.Vulkan
             Image dstImage,
             TextureCreateInfo srcInfo,
             TextureCreateInfo dstInfo,
+            TextureCreateInfo srcStorageInfo,
+            TextureCreateInfo dstStorageInfo,
             Extents2D srcRegion,
             Extents2D dstRegion,
             int srcLayer,
@@ -40,6 +42,13 @@ namespace Ryujinx.Graphics.Vulkan
                 return (xy1, xy2);
             }
 
+            static (Offset3D, Offset3D) ClampOffsetsToMip(Offset3D xy1, Offset3D xy2, int mipW, int mipH)
+            {
+                return (
+                    new Offset3D(Math.Min(xy1.X, mipW), Math.Min(xy1.Y, mipH), xy1.Z),
+                    new Offset3D(Math.Min(xy2.X, mipW), Math.Min(xy2.Y, mipH), xy2.Z));
+            }
+
             if (srcAspectFlags == 0)
             {
                 srcAspectFlags = srcInfo.Format.ConvertAspectFlags();
@@ -80,6 +89,14 @@ namespace Ryujinx.Graphics.Vulkan
                 (srcOffsets.Element0, srcOffsets.Element1) = ExtentsToOffset3D(srcRegion, srcInfo.Width, srcInfo.Height, level);
                 (dstOffsets.Element0, dstOffsets.Element1) = ExtentsToOffset3D(dstRegion, dstInfo.Width, dstInfo.Height, level);
 
+                int srcMipW = Math.Max(1, srcStorageInfo.Width >> (int)copySrcLevel);
+                int srcMipH = Math.Max(1, srcStorageInfo.Height >> (int)copySrcLevel);
+                int dstMipW = Math.Max(1, dstStorageInfo.Width >> (int)copyDstLevel);
+                int dstMipH = Math.Max(1, dstStorageInfo.Height >> (int)copyDstLevel);
+
+                (srcOffsets.Element0, srcOffsets.Element1) = ClampOffsetsToMip(srcOffsets.Element0, srcOffsets.Element1, srcMipW, srcMipH);
+                (dstOffsets.Element0, dstOffsets.Element1) = ClampOffsetsToMip(dstOffsets.Element0, dstOffsets.Element1, dstMipW, dstMipH);
+
                 ImageBlit region = new()
                 {
                     SrcSubresource = srcSl,
@@ -121,6 +138,8 @@ namespace Ryujinx.Graphics.Vulkan
             Image dstImage,
             TextureCreateInfo srcInfo,
             TextureCreateInfo dstInfo,
+            TextureCreateInfo srcStorageInfo,
+            TextureCreateInfo dstStorageInfo,
             int srcViewLayer,
             int dstViewLayer,
             int srcViewLevel,
@@ -151,6 +170,8 @@ namespace Ryujinx.Graphics.Vulkan
                 dstImage,
                 srcInfo,
                 dstInfo,
+                srcStorageInfo,
+                dstStorageInfo,
                 srcViewLayer,
                 dstViewLayer,
                 srcViewLevel,
@@ -186,6 +207,8 @@ namespace Ryujinx.Graphics.Vulkan
             Image dstImage,
             TextureCreateInfo srcInfo,
             TextureCreateInfo dstInfo,
+            TextureCreateInfo srcStorageInfo,
+            TextureCreateInfo dstStorageInfo,
             int srcViewLayer,
             int dstViewLayer,
             int srcViewLevel,
@@ -314,6 +337,14 @@ namespace Ryujinx.Graphics.Vulkan
                 int copyWidth = sizeInBlocks ? BitUtils.DivRoundUp(width, blockWidth) : width;
                 int copyHeight = sizeInBlocks ? BitUtils.DivRoundUp(height, blockHeight) : height;
 
+                int srcMipW = Math.Max(1, srcStorageInfo.Width >> (srcViewLevel + srcLevel + level));
+                int srcMipH = Math.Max(1, srcStorageInfo.Height >> (srcViewLevel + srcLevel + level));
+                int dstMipW = Math.Max(1, dstStorageInfo.Width >> (dstViewLevel + dstLevel + level));
+                int dstMipH = Math.Max(1, dstStorageInfo.Height >> (dstViewLevel + dstLevel + level));
+
+                copyWidth = Math.Min(copyWidth, Math.Min(srcMipW, dstMipW));
+                copyHeight = Math.Min(copyHeight, Math.Min(srcMipH, dstMipH));
+
                 Extent3D extent = new((uint)copyWidth, (uint)copyHeight, (uint)srcDepth);
 
                 if (srcInfo.Samples > 1 && srcInfo.Samples != dstInfo.Samples)

src/Ryujinx.Graphics.Vulkan/TextureStorage.cs

@@ -67,6 +67,8 @@ namespace Ryujinx.Graphics.Vulkan
 
         public VkFormat VkFormat { get; }
 
+        public ImageUsageFlags UsageFlags { get; }
+
         public unsafe TextureStorage(
             VulkanRenderer gd,
             Device device,
@@ -93,7 +95,8 @@ namespace Ryujinx.Graphics.Vulkan
 
             SampleCountFlags sampleCountFlags = ConvertToSampleCountFlags(gd.Capabilities.SupportedSampleCounts, (uint)info.Samples);
 
-            ImageUsageFlags usage = GetImageUsage(info.Format, gd.Capabilities, isMsImageStorageSupported, true);
+            ImageUsageFlags usage = GetImageUsage(info.Format, gd.Capabilities, isMsImageStorageSupported);
+            UsageFlags = usage;
 
             ImageCreateFlags flags = ImageCreateFlags.CreateMutableFormatBit | ImageCreateFlags.CreateExtendedUsageBit;
 
@@ -159,7 +162,7 @@ namespace Ryujinx.Graphics.Vulkan
 
                 _imageAuto = new Auto<DisposableImage>(new DisposableImage(_gd.Api, device, _image));
 
-                InitialTransition(ImageLayout.Preinitialized, ImageLayout.General);
+                InitialTransition(ImageLayout.Undefined, ImageLayout.General);
             }
 
             _slices = new TextureSliceInfo[levels * _depthOrLayers];
@@ -307,7 +310,7 @@ namespace Ryujinx.Graphics.Vulkan
             }
         }
 
-        public static ImageUsageFlags GetImageUsage(Format format, in HardwareCapabilities capabilities, bool isMsImageStorageSupported, bool extendedUsage)
+        public static ImageUsageFlags GetImageUsage(Format format, in HardwareCapabilities capabilities, bool isMsImageStorageSupported)
         {
             ImageUsageFlags usage = DefaultUsageFlags;
 
@@ -320,7 +323,7 @@ namespace Ryujinx.Graphics.Vulkan
                 usage |= ImageUsageFlags.ColorAttachmentBit;
             }
 
-            if ((format.IsImageCompatible && isMsImageStorageSupported) || extendedUsage)
+            if (format.IsImageCompatible && isMsImageStorageSupported)
             {
                 usage |= ImageUsageFlags.StorageBit;
             }

src/Ryujinx.Graphics.Vulkan/TextureView.cs

@@ -64,7 +64,7 @@ namespace Ryujinx.Graphics.Vulkan
             bool isMsImageStorageSupported = gd.Capabilities.SupportsShaderStorageImageMultisample || !info.Target.IsMultisample;
 
             VkFormat format = _gd.FormatCapabilities.ConvertToVkFormat(info.Format, isMsImageStorageSupported);
-            ImageUsageFlags usage = TextureStorage.GetImageUsage(info.Format, gd.Capabilities, isMsImageStorageSupported, false);
+            ImageUsageFlags usage = TextureStorage.GetImageUsage(info.Format, gd.Capabilities, isMsImageStorageSupported) & storage.UsageFlags;
 
             uint levels = (uint)info.Levels;
             uint layers = (uint)info.GetLayers();
@@ -133,6 +133,8 @@ namespace Ryujinx.Graphics.Vulkan
                 shaderUsage |= ImageUsageFlags.StorageBit;
             }
 
+            shaderUsage &= storage.UsageFlags;
+
             _imageView = CreateImageView(componentMapping, subresourceRange, type, shaderUsage);
 
             // Framebuffer attachments and storage images requires a identity component mapping.
@@ -257,6 +259,8 @@ namespace Ryujinx.Graphics.Vulkan
                     dstImage,
                     src.Info,
                     dst.Info,
+                    src.Storage.Info,
+                    dst.Storage.Info,
                     src.FirstLayer,
                     dst.FirstLayer,
                     src.FirstLevel,
@@ -310,6 +314,8 @@ namespace Ryujinx.Graphics.Vulkan
                     dstImage,
                     src.Info,
                     dst.Info,
+                    src.Storage.Info,
+                    dst.Storage.Info,
                     src.FirstLayer,
                     dst.FirstLayer,
                     src.FirstLevel,
@@ -385,6 +391,8 @@ namespace Ryujinx.Graphics.Vulkan
                             dst.GetImage().Get(cbs).Value,
                             src.Info,
                             dst.Info,
+                            src.Storage.Info,
+                            dst.Storage.Info,
                             src.FirstLayer,
                             dst.FirstLayer,
                             src.FirstLevel,
@@ -410,6 +418,8 @@ namespace Ryujinx.Graphics.Vulkan
                         dst.GetImage().Get(cbs).Value,
                         src.Info,
                         dst.Info,
+                        src.Storage.Info,
+                        dst.Storage.Info,
                         srcRegion,
                         dstRegion,
                         src.FirstLayer,
@@ -463,6 +473,8 @@ namespace Ryujinx.Graphics.Vulkan
                 dstImage.Get(cbs).Value,
                 src.Info,
                 dst.Info,
+                src.Storage.Info,
+                dst.Storage.Info,
                 srcRegion,
                 dstRegion,
                 src.FirstLayer,

src/Ryujinx.Graphics.Vulkan/VertexBufferState.cs

@@ -68,9 +68,7 @@ namespace Ryujinx.Graphics.Vulkan
                         int stride = (_stride + (alignment - 1)) & -alignment;
                         int newSize = (_size / _stride) * stride;
 
-                        Buffer buffer = autoBuffer.Get(cbs, 0, newSize).Value;
-
-                        updater.BindVertexBuffer(cbs, binding, buffer, 0, (ulong)newSize, (ulong)stride);
+                        updater.BindVertexBuffer(cbs, binding, autoBuffer, 0, newSize, (ulong)stride);
 
                         _buffer = autoBuffer;
 
@@ -93,11 +91,7 @@ namespace Ryujinx.Graphics.Vulkan
 
             if (autoBuffer != null)
             {
-                int offset = _offset;
-                bool mirrorable = _size <= VertexBufferMaxMirrorable;
-                Buffer buffer = mirrorable ? autoBuffer.GetMirrorable(cbs, ref offset, _size, out _).Value : autoBuffer.Get(cbs, offset, _size).Value;
-
-                updater.BindVertexBuffer(cbs, binding, buffer, (ulong)offset, (ulong)_size, (ulong)_stride);
+                updater.BindVertexBuffer(cbs, binding, autoBuffer, _offset, _size, (ulong)_stride);
             }
         }
 

src/Ryujinx.Graphics.Vulkan/VertexBufferUpdater.cs

@@ -15,6 +15,10 @@ namespace Ryujinx.Graphics.Vulkan
         private readonly NativeArray<ulong> _sizes;
         private readonly NativeArray<ulong> _strides;
 
+        private readonly Auto<DisposableBuffer>[] _bufferAutos;
+        private readonly int[] _bufferOffsetsForGet;
+        private readonly int[] _bufferSizesForGet;
+
         public VertexBufferUpdater(VulkanRenderer gd)
         {
             _gd = gd;
@@ -23,9 +27,13 @@ namespace Ryujinx.Graphics.Vulkan
             _offsets = new NativeArray<ulong>(Constants.MaxVertexBuffers);
             _sizes = new NativeArray<ulong>(Constants.MaxVertexBuffers);
             _strides = new NativeArray<ulong>(Constants.MaxVertexBuffers);
+
+            _bufferAutos = new Auto<DisposableBuffer>[Constants.MaxVertexBuffers];
+            _bufferOffsetsForGet = new int[Constants.MaxVertexBuffers];
+            _bufferSizesForGet = new int[Constants.MaxVertexBuffers];
         }
 
-        public void BindVertexBuffer(CommandBufferScoped cbs, uint binding, VkBuffer buffer, ulong offset, ulong size, ulong stride)
+        public void BindVertexBuffer(CommandBufferScoped cbs, uint binding, Auto<DisposableBuffer> autoBuffer, int offset, int size, ulong stride)
         {
             if (_count == 0)
             {
@@ -39,9 +47,11 @@ namespace Ryujinx.Graphics.Vulkan
 
             int index = (int)_count;
 
-            _buffers[index] = buffer;
-            _offsets[index] = offset;
-            _sizes[index] = size;
+            _bufferAutos[index] = autoBuffer;
+            _bufferOffsetsForGet[index] = offset;
+            _bufferSizesForGet[index] = size;
+            _offsets[index] = (ulong)offset;
+            _sizes[index] = (ulong)size;
             _strides[index] = stride;
 
             _count++;
@@ -51,6 +61,12 @@ namespace Ryujinx.Graphics.Vulkan
         {
             if (_count != 0)
             {
+                for (int i = 0; i < _count; i++)
+                {
+                    _buffers[i] = _bufferAutos[i].Get(cbs, _bufferOffsetsForGet[i], _bufferSizesForGet[i]).Value;
+                    _bufferAutos[i] = null;
+                }
+
                 if (_gd.Capabilities.SupportsExtendedDynamicState)
                 {
                     _gd.ExtendedDynamicStateApi.CmdBindVertexBuffers2(

src/Ryujinx.Graphics.Vulkan/Window.cs

@@ -391,12 +391,12 @@ namespace Ryujinx.Graphics.Vulkan
             {
                 if (_effect != null)
                 {
+                    _gd.FlushAllCommands();
                     _gd.CommandBufferPool.Return(
                         cbs,
                         null,
                         [PipelineStageFlags.ColorAttachmentOutputBit],
                         null);
-                    _gd.FlushAllCommands();
                     cbs.GetFence().Wait();
                     cbs = _gd.CommandBufferPool.Rent();
                 }
@@ -455,6 +455,8 @@ namespace Ryujinx.Graphics.Vulkan
                 ImageLayout.General,
                 ImageLayout.PresentSrcKhr);
 
+            _gd.FlushAllCommands();
+
             _gd.CommandBufferPool.Return(
                 cbs,
                 [_imageAvailableSemaphores[semaphoreIndex]],

src/Ryujinx.HLE/HOS/Services/Am/AppletAE/AllSystemAppletProxiesService/LibraryAppletProxy/ILibraryAppletSelfAccessor.cs

@@ -1,4 +1,5 @@
 using Ryujinx.Common;
+using Ryujinx.Common.Logging;
 using System;
 
 namespace Ryujinx.HLE.HOS.Services.Am.AppletAE.AllSystemAppletProxiesService.LibraryAppletProxy
@@ -60,6 +61,19 @@ namespace Ryujinx.HLE.HOS.Services.Am.AppletAE.AllSystemAppletProxiesService.Lib
 
             return ResultCode.Success;
         }
+        
+        [CommandCmif(10)]
+        // ExitProcessAndReturn -> nn::am::service::LibraryAppletInfo
+        public ResultCode ExitProcessAndReturn(ServiceCtx context)
+        {
+            // Exits the LibraryApplet and returns to running the title which launched this LibraryApplet (qlaunch for example).
+            // On success, official sw will enter an infinite loop with sleep-thread value 86400000000000.
+            // Since we don't currently support qlaunch, it's fine to stub it.
+            
+            Logger.Stub?.PrintStub(LogClass.Service);
+            return ResultCode.Success;
+        }
+
 
         [CommandCmif(11)]
         // GetLibraryAppletInfo() -> nn::am::service::LibraryAppletInfo
@@ -83,7 +97,8 @@ namespace Ryujinx.HLE.HOS.Services.Am.AppletAE.AllSystemAppletProxiesService.Lib
             AppletIdentifyInfo appletIdentifyInfo = new()
             {
                 AppletId = AppletId.QLaunch,
-                TitleId = 0x0100000000001000,
+                // 0x4 padding
+                TitleId = 0x0100000000001000, // qlaunch systemAppletMenu title ID
             };
 
             context.ResponseData.WriteStruct(appletIdentifyInfo);

src/Ryujinx.HLE/Loaders/Processes/ProcessLoader.cs

@@ -28,21 +28,61 @@ namespace Ryujinx.HLE.Loaders.Processes
 
         private ulong _latestPid;
 
+        private readonly object _pidLock = new();
+
 #nullable enable
         public ProcessResult? ActiveApplication
         {
             get
             {
-                return _processesByPid.GetValueOrDefault(_latestPid);
-                
-                // Using this if statement locks up the UI and prevents a new game from loading.
-                // Haven't quite deduced why yet.
-                
-                if (!_processesByPid.TryGetValue(_latestPid, out ProcessResult value))
-                    throw new RyujinxException(
-                        $"The HLE Process map did not have a process with ID {_latestPid}. Are you missing firmware?");
+                lock (_pidLock)
+                {
+                    // Check if _latestPid is still valid
+                    if (_latestPid == 0)
+                    {
+                        return null;
+                    }
 
-                return value;
+                    // Verify process still exists in kernel (authoritative source)
+                    if (!_device.System.KernelContext.Processes.TryGetValue(_latestPid, out HOS.Kernel.Process.KProcess? kernelProcess))
+                    {
+                        // Process no longer exists in kernel, clear stale state
+                        Logger.Warning?.Print(LogClass.Loader,
+                            $"ActiveApplication PID {_latestPid} no longer exists in kernel, clearing stale state");
+
+                        _processesByPid.TryRemove(_latestPid, out _);
+                        _latestPid = 0;
+                        TitleIDs.CurrentApplication.Value = null;
+
+                        return null;
+                    }
+
+                    // Verify process still exists in ProcessLoader's dictionary
+                    if (_processesByPid.TryGetValue(_latestPid, out ProcessResult? processResult))
+                    {
+                        // Additional check: verify process state
+                        if (kernelProcess.State == HOS.Kernel.Process.ProcessState.Exited ||
+                            kernelProcess.State == HOS.Kernel.Process.ProcessState.Exiting)
+                        {
+                            Logger.Warning?.Print(LogClass.Loader,
+                                $"ActiveApplication PID {_latestPid} is in state {kernelProcess.State}, clearing");
+
+                            _processesByPid.TryRemove(_latestPid, out _);
+                            _latestPid = 0;
+                            TitleIDs.CurrentApplication.Value = null;
+
+                            return null;
+                        }
+
+                        return processResult;
+                    }
+
+                    // Fallback: clear stale PID if not in our dictionary
+                    Logger.Warning?.Print(LogClass.Loader,
+                        $"ActiveApplication PID {_latestPid} not in ProcessLoader dictionary, clearing");
+                    _latestPid = 0;
+                    return null;
+                }
             }
         }
 #nullable disable
@@ -285,5 +325,39 @@ namespace Ryujinx.HLE.Loaders.Processes
 
             return false;
         }
+
+        /// <summary>
+        /// Clears a specific process from the ProcessLoader's tracking.
+        /// This should be called when a process exits or is terminated.
+        /// </summary>
+        /// <param name="pid">The process ID to clear</param>
+        public void ClearProcess(ulong pid)
+        {
+            lock (_pidLock)
+            {
+                if (_processesByPid.TryRemove(pid, out _))
+                {
+                    if (_latestPid == pid)
+                    {
+                        _latestPid = 0;
+                        TitleIDs.CurrentApplication.Value = null;
+                    }
+                }
+            }
+        }
+
+        /// <summary>
+        /// Clears all processes from the ProcessLoader's tracking.
+        /// This should be called during system shutdown.
+        /// </summary>
+        public void ClearAllProcesses()
+        {
+            lock (_pidLock)
+            {
+                _processesByPid.Clear();
+                _latestPid = 0;
+                TitleIDs.CurrentApplication.Value = null;
+            }
+        }
     }
 }

src/Ryujinx.HLE/Switch.cs

@@ -183,6 +183,7 @@ namespace Ryujinx.HLE
         {
             if (disposing)
             {
+                Processes.ClearAllProcesses();
                 System.Dispose();
                 AudioDeviceDriver.Dispose();
                 FileSystem.Dispose();