Hard crash without log information

Hi @all,

I have an ASP.net Core application which crashes only on release mode. Despite having installed and configured NLog, in this special case no log information gets written to a file.

I registered a global Exception handler on Startup:

public class Startup
{
	private static NLog.Logger logger = NLog.LogManager.GetCurrentClassLogger();
	// ...
	public void Configure(IApplicationBuilder app, IHostingEnvironment env)
	{
		if (env.IsDevelopment())
		{
			app.UseDeveloperExceptionPage();
		}

		app.UseMvc();

		app.UseExceptionHandler(
		 options => {
			 options.Run(
			 async context =>
			 {
				 context.Response.StatusCode = (int)HttpStatusCode.InternalServerError;
				 context.Response.ContentType = "text/html";
				 var ex = context.Features.Get<IExceptionHandlerFeature>();
				 if (ex != null)
				 {
					 var err = $"<h1>Error: {ex.Error.Message}</h1>{ex.Error.StackTrace }";
					 await context.Response.WriteAsync(err).ConfigureAwait(false);
					 logger.Fatal(ex);
				 }
			 });
		 }
		);
	}
}

In Program I register NLog as logger:

public class Program
{
	public static void Main(string[] args)
	{
		// NLog: setup the logger first to catch all errors
		var logger = LogManager.LoadConfiguration("nlog.config").GetCurrentClassLogger();
		try
		{
			logger.Debug("init main");
			BuildWebHost(args).Run();
		}
		catch (Exception ex)
		{
			//NLog: catch setup errors
			logger.Error(ex, "Stopped program because of exception");
			throw;
		}
		finally
		{
			// Ensure to flush and stop internal timers/threads before application-exit (Avoid segmentation fault on Linux)
			NLog.LogManager.Shutdown();
		}
	}

	public static IWebHost BuildWebHost(string[] args)
	{
		return WebHost.CreateDefaultBuilder(args)
			.UseStartup<Startup>()
			.UseKestrel(options =>
			{
				options.Listen(IPAddress.Any, 55555)
			.UseNLog()  // NLog: setup NLog for Dependency injection
			.Build();
	}
}

My nlog.config:

<?xml version="1.0" encoding="utf-8" ?><nlog xmlns="http://www.nlog-project.org/schemas/NLog.xsd"
      xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
      autoReload="true"
      internalLogLevel="info"
      internalLogFile="c:\temp\internal-nlog.txt"><!-- the targets to write to --><targets><!-- write logs to file  --><target xsi:type="File" name="allfile" fileName="QlcLog-All-${shortdate}.log"
            layout="${longdate}|${event-properties:item=EventId_Id}|${uppercase:${level}}|${logger}|${message} ${exception:format=tostring}" /><!-- another file log, only own logs. Uses some ASP.NET core renderers --><target xsi:type="File" name="ownFile-web" fileName="QlcLog-Own-${shortdate}.log"
            layout="${longdate}|${event-properties:item=EventId_Id}|${assembly-version}|${uppercase:${level}}|${logger}|${callsite}|${callsite-linenumber}|${message} ${exception:format=tostring}|url: ${aspnet-request-url}|action: ${aspnet-mvc-action}" /></targets><!-- rules to map from logger name to target --><rules><!--All logs, including from Microsoft--><logger name="*" minlevel="Error" writeTo="allfile" /><!--Skip non-critical Microsoft logs and so log only own logs--><logger name="Microsoft.*" maxLevel="Error" final="true" /><!-- Own logs --><logger name="*" minlevel="Warn" writeTo="ownFile-web" /></rules><extensions><add assembly="NLog.Web.AspNetCore"/></extensions></nlog>

When an Exception occurs, normally I see them in the console and in the log file, but as I said: Sometimes I get a hard crash in release mode and nothing gets written.

I speculate, that this might be caused by unmanaged code which I use indirectly (SQLite encryption lib).

Is there any way to get the stack trace?

Thanks in advance!