Rider.Backend crashes (i7/i9 CPU 11th Gen+) with "Fatal error. System.AccessViolationException: Attempted to read or write protected memory. This is often an indication that other memory is corrupt."

Problem

Rider crashes either during opening, loading, building project or randomly during the work. The "A Critical Failure has Occurred" dialog appears.

Project is massive. It can be either whatever massive C++ or .Net solution nor an Unreal Engine, Unity projects.

Machine has i9 or i7 CPU 11th Gen or later.

C:\Program Files\JetBrains\Rider\r2r\2026.2.1R\2FB008FBBA0C9F702D5C108D823403B\windows-x64\Rider.Backend.exe --runtimeconfig C:\Program Files\JetBrains\Rider\r2r\2025.2.3R\2FB008FBBA0C9F702D5C108D823403B\Rider.Backend.windows.runtimeconfig.json --Port=62818 --enablecpp
Fatal error. System.AccessViolationException: Attempted to read or write protected memory. This is often an indication that other memory is corrupt.

Description

This is a known issue, and possible solutions are described in IDE crashes on Windows with Intel Core 11th, 13th and 14th Gen CPUs with EXCEPTION_ACCESS_VIOLATION (0xc0000005.

If your CPU matches the criteria: it is i7 or i9 from 11th Gen (or later) watch the mentioned article for solution. This issue is classified as a third-party problem. We have confirmation that the options provided there there solve the issue.

If nothing helps, contact support and share the crash dump (Critical Error Has Occurred" Rider Backend crash. How to capture crash dump) with Rider logs (How to collect Rider logs).

Feel free to report the crash issue directly to our bug tracker (attach the diagnostic data collected).