Handle leak on WCF stress test

[aruntmenons]

In my C++ application, I have added CLR support((/clr) to use WCF communication.

Everything is working well, but i observed handle leak. When I analyze this with WinDbg(!htrace). Its shows handle leaks in .NET libs as shown below.

Handle = 0x0000000000003300 - OPEN
Thread ID = 0x0000000000004dbc, Process ID = 0x000000000000414c

0x000000007785a30a: ntdll!ZwCreateThreadEx+0x000000000000000a
0x000007fefd37ac73: KERNELBASE!CreateRemoteThreadEx+0x0000000000000163
0x00000000776e57a6: KERNEL32!CreateThread+0x0000000000000036
0x000007fedaf3f0aa: clr!ClrCreateManagedInstance+0x000000000001ae0a
0x000007fedaf3efb8: clr!ClrCreateManagedInstance+0x000000000001ad18
0x000007fedaf3f5e3: clr!ClrCreateManagedInstance+0x000000000001b343
0x000007fedaf3f623: clr!ClrCreateManagedInstance+0x000000000001b383
0x000007fedaeb3b5e: clr!PreBindAssemblyEx+0x0000000000007e5e
0x000007fedae0a05f: clr!LogHelp_LogAssert+0x000000000000525f
0x000007fedae0837c: clr!LogHelp_LogAssert+0x000000000000357c
0x000007fedae08125: clr!LogHelp_LogAssert+0x0000000000003325

Handle = 0x00000000000032fc - OPEN
Thread ID = 0x0000000000004dbc, Process ID = 0x000000000000414c

0x0000000077859d0a: ntdll!ZwCreateEvent+0x000000000000000a
0x000007fefd372d15: KERNELBASE!CreateEventExW+0x0000000000000065
0x000007fedaf3db8a: clr!ClrCreateManagedInstance+0x00000000000198ea
0x000007fedaf3dd27: clr!ClrCreateManagedInstance+0x0000000000019a87
0x000007fedaf3f077: clr!ClrCreateManagedInstance+0x000000000001add7
0x000007fedaf3efb8: clr!ClrCreateManagedInstance+0x000000000001ad18
0x000007fedaf3f5e3: clr!ClrCreateManagedInstance+0x000000000001b343
0x000007fedaf3f623: clr!ClrCreateManagedInstance+0x000000000001b383
0x000007fedaeb3b5e: clr!PreBindAssemblyEx+0x0000000000007e5e
0x000007fedae0a05f: clr!LogHelp_LogAssert+0x000000000000525f
0x000007fedae0837c: clr!LogHelp_LogAssert+0x000000000000357c
0x000007fedae08125: clr!LogHelp_LogAssert+0x0000000000003325
0x000007fedaeb5abf: clr!PreBindAssemblyEx+0x0000000000009dbf
0x00000000776e571d: KERNEL32!BaseThreadInitThunk+0x000000000000000d

Handle = 0x00000000000032f8 - OPEN
Thread ID = 0x0000000000004dbc, Process ID = 0x000000000000414c

0x0000000077859d0a: ntdll!ZwCreateEvent+0x000000000000000az
0x000007fefd372d15: KERNELBASE!CreateEventExW+0x0000000000000065
0x000007fedaf3db8a: clr!ClrCreateManagedInstance+0x00000000000198ea
0x000007fedaf3dd19: clr!ClrCreateManagedInstance+0x0000000000019a79
0x000007fedaf3f077: clr!ClrCreateManagedInstance+0x000000000001add7
0x000007fedaf3efb8: clr!ClrCreateManagedInstance+0x000000000001ad18
0x000007fedaf3f5e3: clr!ClrCreateManagedInstance+0x000000000001b343
0x000007fedaf3f623: clr!ClrCreateManagedInstance+0x000000000001b383
0x000007fedaeb3b5e: clr!PreBindAssemblyEx+0x0000000000007e5e
0x000007fedae0a05f: clr!LogHelp_LogAssert+0x000000000000525f
0x000007fedae0837c: clr!LogHelp_LogAssert+0x000000000000357c
0x000007fedae08125: clr!LogHelp_LogAssert+0x0000000000003325
0x000007fedaeb5abf: clr!PreBindAssemblyEx+0x0000000000009dbf
0x00000000776e571d: KERNEL32!BaseThreadInitThunk+0x000000000000000d

Am using VS 2015 and .Net version is 4.5.2.

Is this an issue in .NET like below?

https://support.microsoft.com/en-in/help/2973904/event-handle-leaks-in-a-net-framework-4-based-application

Arun Menon

[jkotas]

This is an issue in .NET Framework, not in the open source .NET Core that lives in this repo.

It is not possible to tell from the stacktraces you have shared whether this issue is duplicate of https://support.microsoft.com/en-in/help/2973904/event-handle-leaks-in-a-net-framework-4-based-application.

.NET Framework 4.5.2 is quite old. It would recommend upgrading to latest .NET Framework 4.8 to see whether it is going to fix the problem. If the problem still persists, please use links in https://github.com/dotnet/core#getting-help to report problems in .NET Framework.