We’ve escalated this question to Umbraco Cloud support, but while waiting for that I wanted to check if someone has encountered this problem before or not.
Our production environment for a client is returning error 500 (we have yet to go live luckily).
Checking logs via Umbraco Cloud portal, it seems to throw this error at every boot attempt:
2025-04-23 11:23:54 FTL Panic, exception while loading cache data.
System.ArgumentOutOfRangeException: Specified argument was out of the range of valid values. (Parameter length)
at CSharpTest.Net.IO.TransactedCompoundFile.Write(UInt32 handle, Byte[] bytes, Int32 offset, Int32 length)
at CSharpTest.Net.Storage.BTreeFileStoreV2.Update[T](IStorageHandle handleIn, ISerializer`1 serializer, T node)
at CSharpTest.Net.Collections.LurchTable`2.TryDequeue(Predicate`1 predicate, KeyValuePair`2& value)
at CSharpTest.Net.Collections.BPlusTree`2.StorageCache.Flush()
at CSharpTest.Net.Collections.BPlusTree`2.StorageCache.Commit()
at CSharpTest.Net.Collections.BPlusTree`2.CommitChanges(Boolean requiresLock)
at Umbraco.Cms.Infrastructure.PublishedCache.ContentStore.Release(WriteLockInfo lockInfo, Boolean commit)
at Umbraco.Cms.Infrastructure.PublishedCache.PublishedSnapshotService.LockAndLoadMedia(Func`1 action)
at Umbraco.Cms.Infrastructure.PublishedCache.PublishedSnapshotService.<EnsureCaches>b__56_0()
at System.Threading.LazyInitializer.EnsureInitializedCore[T](T& target, Boolean& initialized, Object& syncLock, Func`1 valueFactory)
at Umbraco.Cms.Infrastructure.PublishedCache.PublishedSnapshotService.EnsureCaches()
at Umbraco.Cms.Infrastructure.PublishedCache.PublishedSnapshotService.CreatePublishedSnapshot(String previewToken)
at System.Lazy`1.ViaFactory(LazyThreadSafetyMode mode)
at System.Lazy`1.ExecutionAndPublication(LazyHelper executionAndPublication, Boolean useDefaultConstructor)
at System.Lazy`1.CreateValue()
at Umbraco.Cms.Web.Common.UmbracoContext.UmbracoContext.get_Content()
at Umbraco.Cms.Web.Website.Routing.UmbracoRouteValueTransformer.TransformAsync(HttpContext httpContext, RouteValueDictionary values)
at Microsoft.AspNetCore.Mvc.Routing.DynamicControllerEndpointMatcherPolicy.ApplyAsync(HttpContext httpContext, CandidateSet candidates)
at Microsoft.AspNetCore.Routing.Matching.DfaMatcher.SelectEndpointWithPoliciesAsync(HttpContext httpContext, IEndpointSelectorPolicy[] policies, CandidateSet candidateSet)
at Microsoft.AspNetCore.Routing.EndpointRoutingMiddleware.<Invoke>g__AwaitMatch|10_1(EndpointRoutingMiddleware middleware, HttpContext httpContext, Task matchTask)
at StackExchange.Profiling.MiniProfilerMiddleware.Invoke(HttpContext context) in C:\projects\dotnet\src\MiniProfiler.AspNetCore\MiniProfilerMiddleware.cs:line 112
at Umbraco.Cms.Web.Common.Middleware.UmbracoRequestMiddleware.InvokeAsync(HttpContext context, RequestDelegate next)
at Umbraco.Cms.Web.Common.Middleware.UmbracoRequestMiddleware.InvokeAsync(HttpContext context, RequestDelegate next)
at Microsoft.AspNetCore.Builder.UseMiddlewareExtensions.InterfaceMiddlewareBinder.<>c__DisplayClass2_0.<<CreateMiddleware>b__0>d.MoveNext()
--- End of stack trace from previous location ---
at Umbraco.Cms.Web.Common.Middleware.PreviewAuthenticationMiddleware.InvokeAsync(HttpContext context, RequestDelegate next)
at Microsoft.AspNetCore.Builder.UseMiddlewareExtensions.InterfaceMiddlewareBinder.<>c__DisplayClass2_0.<<CreateMiddleware>b__0>d.MoveNext()
--- End of stack trace from previous location ---
at Umbraco.Cms.Web.Common.Middleware.UmbracoRequestLoggingMiddleware.InvokeAsync(HttpContext context, RequestDelegate next)
at Microsoft.AspNetCore.Builder.UseMiddlewareExtensions.InterfaceMiddlewareBinder.<>c__DisplayClass2_0.<<CreateMiddleware>b__0>d.MoveNext()
--- End of stack trace from previous location ---
at SixLabors.ImageSharp.Web.Middleware.ImageSharpMiddleware.Invoke(HttpContext httpContext, Boolean retry)
at Umbraco.Forms.Web.HttpModules.ProtectFormUploadRequestsMiddleware.InvokeAsync(HttpContext context, RequestDelegate next)
at Microsoft.AspNetCore.Builder.UseMiddlewareExtensions.InterfaceMiddlewareBinder.<>c__DisplayClass2_0.<<CreateMiddleware>b__0>d.MoveNext()
--- End of stack trace from previous location ---
at Microsoft.AspNetCore.Server.IIS.Core.IISHttpContextOfT`1.ProcessRequestAsync()
2025-04-23 11:23:54 ERR Connection ID "12177733397510106589", Request ID "40002df1-0001-a900-b63f-84710c7967bb": An unhandled exception was thrown by the application.
System.ArgumentOutOfRangeException: Specified argument was out of the range of valid values. (Parameter length)
at CSharpTest.Net.IO.TransactedCompoundFile.Write(UInt32 handle, Byte[] bytes, Int32 offset, Int32 length)
at CSharpTest.Net.Storage.BTreeFileStoreV2.Update[T](IStorageHandle handleIn, ISerializer`1 serializer, T node)
at CSharpTest.Net.Collections.LurchTable`2.TryDequeue(Predicate`1 predicate, KeyValuePair`2& value)
at CSharpTest.Net.Collections.BPlusTree`2.StorageCache.Flush()
at CSharpTest.Net.Collections.BPlusTree`2.StorageCache.Commit()
at CSharpTest.Net.Collections.BPlusTree`2.CommitChanges(Boolean requiresLock)
at Umbraco.Cms.Infrastructure.PublishedCache.ContentStore.Release(WriteLockInfo lockInfo, Boolean commit)
at Umbraco.Cms.Infrastructure.PublishedCache.PublishedSnapshotService.LockAndLoadMedia(Func`1 action)
at Umbraco.Cms.Infrastructure.PublishedCache.PublishedSnapshotService.<EnsureCaches>b__56_0()
at System.Threading.LazyInitializer.EnsureInitializedCore[T](T& target, Boolean& initialized, Object& syncLock, Func`1 valueFactory)
at Umbraco.Cms.Infrastructure.PublishedCache.PublishedSnapshotService.EnsureCaches()
at Umbraco.Cms.Infrastructure.PublishedCache.PublishedSnapshotService.CreatePublishedSnapshot(String previewToken)
at System.Lazy`1.ViaFactory(LazyThreadSafetyMode mode)
at System.Lazy`1.ExecutionAndPublication(LazyHelper executionAndPublication, Boolean useDefaultConstructor)
at System.Lazy`1.CreateValue()
at Umbraco.Cms.Web.Common.UmbracoContext.UmbracoContext.get_Content()
at Umbraco.Cms.Web.Website.Routing.UmbracoRouteValueTransformer.TransformAsync(HttpContext httpContext, RouteValueDictionary values)
at Microsoft.AspNetCore.Mvc.Routing.DynamicControllerEndpointMatcherPolicy.ApplyAsync(HttpContext httpContext, CandidateSet candidates)
at Microsoft.AspNetCore.Routing.Matching.DfaMatcher.SelectEndpointWithPoliciesAsync(HttpContext httpContext, IEndpointSelectorPolicy[] policies, CandidateSet candidateSet)
at Microsoft.AspNetCore.Routing.EndpointRoutingMiddleware.<Invoke>g__AwaitMatch|10_1(EndpointRoutingMiddleware middleware, HttpContext httpContext, Task matchTask)
at StackExchange.Profiling.MiniProfilerMiddleware.Invoke(HttpContext context) in C:\projects\dotnet\src\MiniProfiler.AspNetCore\MiniProfilerMiddleware.cs:line 112
at Umbraco.Cms.Web.Common.Middleware.UmbracoRequestMiddleware.InvokeAsync(HttpContext context, RequestDelegate next)
at Umbraco.Cms.Web.Common.Middleware.UmbracoRequestMiddleware.InvokeAsync(HttpContext context, RequestDelegate next)
at Microsoft.AspNetCore.Builder.UseMiddlewareExtensions.InterfaceMiddlewareBinder.<>c__DisplayClass2_0.<<CreateMiddleware>b__0>d.MoveNext()
--- End of stack trace from previous location ---
at Umbraco.Cms.Web.Common.Middleware.PreviewAuthenticationMiddleware.InvokeAsync(HttpContext context, RequestDelegate next)
at Microsoft.AspNetCore.Builder.UseMiddlewareExtensions.InterfaceMiddlewareBinder.<>c__DisplayClass2_0.<<CreateMiddleware>b__0>d.MoveNext()
--- End of stack trace from previous location ---
at Umbraco.Cms.Web.Common.Middleware.UmbracoRequestLoggingMiddleware.InvokeAsync(HttpContext context, RequestDelegate next)
at Microsoft.AspNetCore.Builder.UseMiddlewareExtensions.InterfaceMiddlewareBinder.<>c__DisplayClass2_0.<<CreateMiddleware>b__0>d.MoveNext()
--- End of stack trace from previous location ---
at SixLabors.ImageSharp.Web.Middleware.ImageSharpMiddleware.Invoke(HttpContext httpContext, Boolean retry)
at Umbraco.Forms.Web.HttpModules.ProtectFormUploadRequestsMiddleware.InvokeAsync(HttpContext context, RequestDelegate next)
at Microsoft.AspNetCore.Builder.UseMiddlewareExtensions.InterfaceMiddlewareBinder.<>c__DisplayClass2_0.<<CreateMiddleware>b__0>d.MoveNext()
--- End of stack trace from previous location ---
at Microsoft.AspNetCore.Server.IIS.Core.IISHttpContextOfT`1.ProcessRequestAsync()
We’ve tried with deleting everything under Data/Temp and restarting the site, but no luck.
Any idea what could be the culprit? I was suspecting something weird in the database, maybe. But we can’t check the DB in Umbraco Cloud, which is just as well since I wouldn’t know what to check for 