EF read operation kills app consistently after 535 accesses.

EF Core kills app after 535 reads from a DBContext.

Replication:

Replication Steps:

• Open DBContext to Sqlite file.
• Perform scalar query (like context.XXX.Count() ) at least 535 times.

Expected:

• Can run query endlessly…

Actual:

• After 535 reads, the process is quit, without throwing a FirstChange, or UnhandledException, with exit code 3.
• App always ends exactly on this number every single time.
• When I try accessing a different DBContext before, the app crashes at a smaller number (implying the number is a sum…).

Checked the Following:

Tried the following, in a loop:

• Creating fresh context from the same database, without any operations -> no problem
• Creating fresh context from the same database, with one operation per context -> problem exists
• Creating fresh context from a different database, with one operation per context -> problem exists
• Using an empty, non-spatial table -> problem exists

Tried the following:

• Ensured all on one thread, no async.
• Wait between calls, GC.Collect() & GC.WaitForPendingFinalizers().
• Nothing on Trace.
• Turned off antivirus
• Replaced IQuerable’s Count() to IEnumerable’s ToArray().Count().

Code:

In the console app, the Main()

static void Main(string[] args)
{
    // logging, exception handling

    using (var context = new XXXDbContext (...))
    {
        var n = 0;
        while (true)
        {
            n++;
            Thread.Sleep(100);

            Console.WriteLine($"Reading {n}");
            Console.WriteLine($"Got {context.XXX.Count()}");
        }
    }
}

Trimmed XXXDbContext down to:

protected override void OnModelCreating(ModelBuilder modelBuilder)
{
    base.OnModelCreating (modelBuilder);

    modelBuilder.Entity<XXX>()
        .Property(_ => _.ID)
        .Metadata.SetBeforeSaveBehavior(PropertySaveBehavior.Ignore);

    ...
}

and:

protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
{
    base.OnConfiguring(optionsBuilder);

    // ...

    optionsBuilder.UseSqlite(@"Data Source=C:\XXX\a.sqlite", x => x.UseNetTopologySuite());

    // ...
}

Output:

Nothing on Trace, output from Visual Studio console window:

Got 0
Reading 534
Got 0
Reading 535

C:\trunk3\source\XXX\ConsoleAppTester\bin\Debug\netcoreapp3.1\ConsoleAppTester.exe (process 44764) exited with code 3.
To automatically close the console when debugging stops, enable Tools->Options->Debugging->Automatically close the console when debugging stops.
Press any key to close this window . . .

Attaching last few lines from ProcMon (hope this helps):

5:50:50.2998972 PM	ConsoleAppTester.exe	58300	IRP_MJ_CLOSE	C:\Program Files\dotnet\shared\Microsoft.NETCore.App\3.1.14\System.Text.RegularExpressions.dll	SUCCESS	
5:50:50.2999041 PM	ConsoleAppTester.exe	58300	CloseFile	C:\Program Files\dotnet\shared\Microsoft.NETCore.App\3.1.14\System.Runtime.InteropServices.RuntimeInformation.dll	SUCCESS	
5:50:50.2999112 PM	ConsoleAppTester.exe	58300	IRP_MJ_CLOSE	C:\Program Files\dotnet\shared\Microsoft.NETCore.App\3.1.14\System.Runtime.InteropServices.RuntimeInformation.dll	SUCCESS	
5:50:50.3000064 PM	ConsoleAppTester.exe	58300	CloseFile	C:\trunk3\source\XXX\ConsoleAppTester\bin\Debug\netcoreapp3.1\Microsoft.Extensions.DependencyModel.dll	SUCCESS	
5:50:50.3000139 PM	ConsoleAppTester.exe	58300	IRP_MJ_CLOSE	C:\trunk3\source\XXX\ConsoleAppTester\bin\Debug\netcoreapp3.1\Microsoft.Extensions.DependencyModel.dll	SUCCESS	
5:50:50.3000212 PM	ConsoleAppTester.exe	58300	CloseFile	C:\trunk3\source\XXX\ConsoleAppTester\bin\Debug\netcoreapp3.1\Microsoft.DotNet.PlatformAbstractions.dll	SUCCESS	
5:50:50.3000281 PM	ConsoleAppTester.exe	58300	IRP_MJ_CLOSE	C:\trunk3\source\XXX\ConsoleAppTester\bin\Debug\netcoreapp3.1\Microsoft.DotNet.PlatformAbstractions.dll	SUCCESS	
5:50:50.3000357 PM	ConsoleAppTester.exe	58300	CloseFile	C:\trunk3\source\XXX\ConsoleAppTester\bin\Debug\netcoreapp3.1\System.Text.Json.dll	SUCCESS	
5:50:50.3000426 PM	ConsoleAppTester.exe	58300	IRP_MJ_CLOSE	C:\trunk3\source\XXX\ConsoleAppTester\bin\Debug\netcoreapp3.1\System.Text.Json.dll	SUCCESS	
5:50:50.3000491 PM	ConsoleAppTester.exe	58300	CloseFile	C:\Program Files\dotnet\shared\Microsoft.NETCore.App\3.1.14\System.Buffers.dll	SUCCESS	
5:50:50.3000562 PM	ConsoleAppTester.exe	58300	IRP_MJ_CLOSE	C:\Program Files\dotnet\shared\Microsoft.NETCore.App\3.1.14\System.Buffers.dll	SUCCESS	
5:50:50.3000629 PM	ConsoleAppTester.exe	58300	CloseFile	C:\Program Files\dotnet\shared\Microsoft.NETCore.App\3.1.14\System.Runtime.CompilerServices.Unsafe.dll	SUCCESS	
5:50:50.3000697 PM	ConsoleAppTester.exe	58300	IRP_MJ_CLOSE	C:\Program Files\dotnet\shared\Microsoft.NETCore.App\3.1.14\System.Runtime.CompilerServices.Unsafe.dll	SUCCESS	
5:50:50.3000775 PM	ConsoleAppTester.exe	58300	CloseFile	C:\Program Files\dotnet\shared\Microsoft.NETCore.App\3.1.14\System.Numerics.Vectors.dll	SUCCESS	
5:50:50.3000856 PM	ConsoleAppTester.exe	58300	IRP_MJ_CLOSE	C:\Program Files\dotnet\shared\Microsoft.NETCore.App\3.1.14\System.Numerics.Vectors.dll	SUCCESS	
5:50:50.3000952 PM	ConsoleAppTester.exe	58300	RegCloseKey	HKLM\System\CurrentControlSet\Control\Nls\CodePage	SUCCESS	
5:50:50.3005309 PM	ConsoleAppTester.exe	58300	RegCloseKey	HKCU\Software\Classes	SUCCESS	
5:50:50.3007069 PM	ConsoleAppTester.exe	58300	CloseFile	C:\XXX\a.sqlite	SUCCESS	
5:50:50.3089956 PM	ConsoleAppTester.exe	58300	IRP_MJ_CLOSE	C:\...\ConsoleAppTester\bin\Debug\netcoreapp3.1\ConsoleAppTester.exe	SUCCESS	

and the the last line’s Stack Trace:

0	FLTMGR.SYS	FltDecodeParameters + 0x1e3c	0xfffff8008232608c	C:\WINDOWS\System32\drivers\FLTMGR.SYS
1	FLTMGR.SYS	FltDecodeParameters + 0x18e7	0xfffff80082325b37	C:\WINDOWS\System32\drivers\FLTMGR.SYS
2	FLTMGR.SYS	FltDecodeParameters + 0x8f6	0xfffff80082324b46	C:\WINDOWS\System32\drivers\FLTMGR.SYS
3	FLTMGR.SYS	FltDecodeParameters + 0x66b	0xfffff800823248bb	C:\WINDOWS\System32\drivers\FLTMGR.SYS
4	ntoskrnl.exe	IofCallDriver + 0x55	0xfffff80080052f55	C:\WINDOWS\system32\ntoskrnl.exe
5	ntoskrnl.exe	NtQueryInformationFile + 0xf9a	0xfffff80080400f9a	C:\WINDOWS\system32\ntoskrnl.exe
6	ntoskrnl.exe	NtSetEvent + 0x190	0xfffff800803fb300	C:\WINDOWS\system32\ntoskrnl.exe
7	ntoskrnl.exe	ObfDereferenceObjectWithTag + 0xc7	0xfffff80080061277	C:\WINDOWS\system32\ntoskrnl.exe
8	ntoskrnl.exe	PcwAddInstance + 0x164e	0xfffff8008045dd1e	C:\WINDOWS\system32\ntoskrnl.exe
9	ntoskrnl.exe	KeUserModeCallback + 0x1786	0xfffff80080506a96	C:\WINDOWS\system32\ntoskrnl.exe
10	ntoskrnl.exe	LpcRequestPort + 0x2a2e	0xfffff80080509f8e	C:\WINDOWS\system32\ntoskrnl.exe
11	ntoskrnl.exe	setjmpex + 0x7c25	0xfffff800802077b5	C:\WINDOWS\system32\ntoskrnl.exe

System Information:

EF Core version: 5.0.6 (previously, tried also on 5.0.1) Database provider: SQLite Target framework: netcoreapp3.1 (console; previously, tried also in WPF) Operating system: Microsoft Windows 10 Pro / 10.0.19042 N/A Build 19042 IDE: Microsoft Visual Studio Professional 2019 / Version 16.8.5

.NET SDK (reflecting any global.json):
 Version:   5.0.104
 Commit:    ca6b6acadb

Runtime Environment:
 OS Name:     Windows
 OS Version:  10.0.19042
 OS Platform: Windows
 RID:         win10-x64
 Base Path:   C:\Program Files\dotnet\sdk\5.0.104\

Host (useful for support):
  Version: 5.0.5
  Commit:  2f740adc14

.NET SDKs installed:
  2.1.202 [C:\Program Files\dotnet\sdk]
  2.1.523 [C:\Program Files\dotnet\sdk]
  3.1.408 [C:\Program Files\dotnet\sdk]
  5.0.103 [C:\Program Files\dotnet\sdk]
  5.0.104 [C:\Program Files\dotnet\sdk]

[AndroidEFCoreLover]

Got it going - downgraded apps to be 32 bit, and the 32bit works.

[vonzshik]

Also reproducible with SQLitePCLRaw, which suggests the problem is with either sqlite or mod_spatialite. The error message is ‘The specified module could not be found’.

using System;
using static SQLitePCL.raw;

static void Main(string[] args)
{
	var counter = 1;

	SQLitePCL.Batteries.Init();

	while (true)
	{
		Console.WriteLine(counter);
		counter++;
		var rc = sqlite3_open("a.db", out var db);
		HandleRc(rc);

		using var _ = db;

		rc = sqlite3_enable_load_extension(db, 1);
		HandleRc(rc);

		rc = sqlite3_exec(db, "SELECT load_extension('mod_spatialite.dll');", out var errorMessage);
		HandleRc(rc, errorMessage);
	}
}

static void HandleRc(int rc, string errorMessage = null)
{
	if (rc != 0)
	{
		throw string.IsNullOrEmpty(errorMessage) 
			? new Exception($"{sqlite3_errstr(rc).utf8_to_string()}")
			: new Exception(errorMessage);
	}
}