Since Black Ops 2 was optimized for older operating systems, forcing Windows 10 or 11 to emulate a legacy environment can resolve memory handling conflicts.
Players on Steam community forums have discovered that a specific story choice can bypass this crash in the LA mission:
The "Failed to allocate from state pool" error in Call of Duty: Black Ops 2
Right-click Call of Duty: Black Ops 2 and select . Navigate to the Installed Files tab. Click Verify integrity of game files . Since Black Ops 2 was optimized for older
Even on Windows 10/11, BO2 needs older DX9 libs.
Since the error is caused by a lack of allocatable memory, applying a Large Address Aware (LAA) patch forces the 32-bit executable to recognize and utilize up to 4GB of system RAM.
Download a trusted third-party (such as the one by NTCore). Run the patch tool executable on your PC. Click Verify integrity of game files
Method 2: The Campaign Story Path Workaround (The "Harper" Bug)
Black Ops II launched in 2012 for Windows 7. Running it on Windows 10 or 11 can sometimes cause memory allocation errors. You can use Windows' compatibility settings to make it think it's on an older system.
To fix the error in Call of Duty: Black Ops 2 , players must lower their graphics settings, run the game in windowed mode, or bypass specific campaign story choices that trigger memory allocation leaks. This memory-related crash primarily plagues PC users during intense campaign sequences—most notably during the "Cordis Die" (LA Mission) or the "Karma" mission—and occasionally disrupts players in multiplayer or Zombie modes. Download a trusted third-party (such as the one by NTCore)
Corrupted script files often cause memory leaks inside the state pool. Verifying your game cache ensures clean assets are loaded. Completely close the game and restart your PC. Open and navigate to your Library .
Which is crashing? (Campaign, Multiplayer, or Zombies) What graphics card and monitor refresh rate are you using?