Memory leak in asp.net mvc site

Question

User-980557072 posted

Good day !

My asp.net mvc website grows to 3 GB in 15-30 minutes and restarts. I'm ready provide technical details and must know what details need.

IIS: 10.0.14393.0
MVC: 4.0

Web.config in Views folder

Web.config for application

Thanks !

Answer 1

User303363814 posted

What objects are being created by your app?  How are you disposing of them?

Answer 2

User-980557072 posted

The site is e-shop. The main functionality: viewing the product catalog, product selection, purchase.
I'm using Dapper as ORM for access to database:

<package id="Dapper" version="1.50.2" targetFramework="net45" />

Like a wrapper for a dapper, i'm using DataBaseHelper<T>

Answer 3

User753101303 posted

Hi,

Make sure Dispose is called for all disposable objects. Even in VS Community you should have https://docs.microsoft.com/en-us/visualstudio/profiling/memory-usage?view=vs-2019 to trach memory usage on yout machine and see what is kept in memory.

Answer 4

User-980557072 posted

Good day !

My disposable objects is disposed. 
'Private bytes' level grows (Private_butes.png). I did dumps with 'gflags -i w3wp.exe +ust' option and analyzed them with DebugDiag Analysis.

In dumps i see stack like:

clrjit!CodeGen::genCreateAndStoreGCInfoX64+141 f:\dd\ndp\clr\src\jit\codegenxarch.cpp @ 8484 + 8
clrjit!CodeGen::genGenerateCode+2c1 f:\dd\ndp\clr\src\jit\codegencommon.cpp @ 3383
clrjit!Compiler::compCompile+755 f:\dd\ndp\clr\src\jit\compiler.cpp @ 4680
clrjit!Compiler::compCompileHelper+2c2 f:\dd\ndp\clr\src\jit\compiler.cpp @ 5810
clrjit!Compiler::compCompile+202 f:\dd\ndp\clr\src\jit\compiler.cpp @ 5153 + 1d
clrjit!jitNativeCode+270 f:\dd\ndp\clr\src\jit\compiler.cpp @ 6451 + 50
clrjit!CILJit::compileMethod+a2 f:\dd\ndp\clr\src\jit\ee_il_dll.cpp @ 299

Is there a memory leak in the native code?

Answer 5

User-17257777 posted

Hi eddy_cs,

I analyze the dump file and find one request excuate more than 15 sec

And it is related to the getproductlist() method, how much data does it retuen? Also, you can check if there is any problem in it.

Best Regards,

Jiadong Meng

Answer 6

User-980557072 posted

Hi Charles !

I'm not using EF in this site at all. I will analyze models to find navigation property.

Thank you!

Answer 7

User-980557072 posted

Hi Jiadongm !

I will reseach method "GET /devicemodel.....".

Thank you !

Answer 8

User753101303 posted

A bit later it shows how to take a snapshot and then you can get a report with the number and size of objects for each object type which should help to figure out what is kept in memory. You could do that when testing on your VS machine.

If you want to analyze a memory dump coming from a production machine, VS Enterprise does this out of the box or if you don't have this option in your VS edition you could try  https://snede.net/hunting-net-memory-leaks-with-windbg/

It should help to figure out quite quickly which objects are taking that much memory...

Answer 9

User409696431 posted

You might want to read https://www.meadow.se/wordpress/debugging-a-memory-leak-in-an-asp-net-mvc-application/ which has a description of tools and approaches used to track down a memory leak that was showing up in Private Bytes.  The specific cause of the leak my not be related to yours, but you might find help in the approach.