File System Filter EasyAntiCheat_EOSSys` does not support Bypass IO [CRASHING]

Question

Hello,

For about a month now, I would have trouble with a game (Fortnite) crashing a steady amount due to the anti cheat Epic Games uses, EasyAntiCheat. When I look in event viewer after a crash, it presents this:

_______________________________________________________________________________________________________________________

Log Name: System

Source: Microsoft-Windows-FilterManager

Date: 12/14/2024 10:05:04 PM

Event ID: 11

Task Category: None

Level: Warning

Keywords:

User: SYSTEM

Computer: DESKTOP-NLJH1M8

Description:

File System Filter 'EasyAntiCheat_EOSSys' (Version 6.1, ‎2024‎-‎11‎-‎27T06:19:31.000000000Z) does not support bypass IO.

Supported features: 0x4.

Event Xml:

11

0

3

0

0

0x8000000000000000

66328

System

DESKTOP-NLJH1M8

EasyAntiCheat\_EOSSys

6

1

2024-11-27T06:19:31.0000000Z

0x4

_______________________________________________________________________________________________________________________

I tried reinstalling the game which didn't work, along with internet research which didn't present many results and no working solutions. I disabled my AV to see if that was the cause as well, but no difference.

At this point I am at my wits' end.

Any solutions or ideas?

All will be greatly appreciated!

Cheers,

PM

Answer 1

It's early days,  but I think I am able to share a potential resolution that may help other users.

I am an IT Field Engineer, and also run the Youtube Channel Next Level Sim Gaming

As stated, the issue is that Easy Anti Cheat shows that File Filter does not support Bypass IO, this is a widespread issue that is affecting a number of Core Ultra 9 owners, largely due to the new architecture of the processor, but also other users in general, the issue is that the NVME driver is not correctly filtering the ByPass IO feature, which is a Windows 11 feature.

Suggested fixes show that disabling Core Isolation, and Virtualisation, and being on the latest Windows 24H2 should mitigate this issue, this is not however correct for Intel.

First of all, I completely uninstalled EasyAntiCheat.

On my system for example, I have 4 Nvme drives, all are Bypass IO compatible, so the initial error did not make sense to me, upon investigation of the filter drivers, the Intel RST driver relies on Virtualisation and Hyper V to run correctly

C:\Windows\System32>fsutil bypassIo state C:\
BypassIo on "C:" is currently supported
    Storage Type:   NVMe
    Storage Driver: BypassIo compatible

I set the following elevated commands to activate Hyper V, and also Credential Guard, also activated Intel Virtualization, Core Isolation is still disabled (open command prompt as admin, and copy and paste each value)

DISM /Online /Enable-Feature /All/FeatureName:Microsoft-Hyper-V reg add 

HKLM\SYSTEM\CurrentControlSet\Control\DeviceGuard /t REG_DWORD /v 

EnableVirtualizationBasedSecurity /d 1 /f reg add 

HKLM\SYSTEM\CurrentControlSet\Control\DeviceGuard\Scenarios\CredentialGuard /t 

REG_DWORD /v Enabled /d 1 /f reg add

HKLM\SYSTEM\CurrentControlSet\Control\DeviceGuard\Scenarios\HypervisorEnforcedCodeIntegrity /t REG_DWORD /v Enabled /d 1 /f reg add 

HKLM\SYSTEM\CurrentControlSet\Control\DeviceGuard\Scenarios\KeyGuard\Status /t REG_DWORD /v CredGuardEnabled /d 1 /f reg add 

HKLM\SYSTEM\CurrentControlSet\Control\DeviceGuard\Scenarios\KeyGuard\Status /t 

REG_DWORD /v KeyGuardEnabled /d 1 /f

Ensure Core Isolation is Off 

I also in BIOS disabled AMI Native NVME Driver Support
I then reinstalled EasyAntiCheat from drive H from the iRacing EAC folder
Previously the game would crash within minutes, however now, I have played successfully and have had no Events relating to the issue,

Answer 2

Ivan Bitencourt seems to have solved it!

Turn off core isolation in windows security following these steps:

https://support.microsoft.com/en-us/windows/options-to-optimize-gaming-performance-in-windows-11-a255f612-2949-4373-a566-ff6f3f474613

Answer 3

Has anyone experienced this warning along with Windows freezing, but the mouse still moves normally?

I always get freezes while playing VRChat, and I see this warning too, likely because it uses EasyAntiCheat.

Disabling Core Isolation didn’t fix it for me

Answer 4

This does not solve the issue for me. I was also adviced from epic games to delete a web cache folder that could be the problem, and the event viewer be a "false" positive error.

Regardless, my current state of the module after having reinstalled easyanticheat is

BypassIo on "C:\Windows\System32" is not currently supported

Status:  506 (At least one minifilter does not support bypass IO) 

Driver:  EasyAntiCheat\_EOSSys 

Reason:  The specified minifilter does not support bypass IO. 

Storage Type:   NVMe 

Storage Driver: Not BypassIo Compatible 

Driver Name:    iaStorVD.sys

I am on

Windows 11 Pro

24H2

os build 26100.2605

Now a possible solution to the issue from epic games, was to delete a folder located in the following location : post dump from their support reply -

OK, I will try to go through the troubleshooting steps with you here. Please try to follow the steps below to clear your launcher's cache on Windows:

1. In the lower right corner click on the arrow pointing up (the chevron)
2. Right-click on the Epic icon in the pop up window
3. Select Exit
4. Press the Windows key and tap the R key, this will open a run window
5. Type %localappdata%
6. Press the Enter key, this will open File Explorer
7. Open the EpicGamesLauncher folder
8. Open the Saved folder
9. Right click and select delete on:

• webcache
• webcache_4147
• webcache_4430

There may only be one or two of the files present

I am currently testing out now, to see if another crash happens. i can already see in event viewer that the filtermanager is already crying about the bypass problem. But game have yet to crash *crosses fingers*

Answer 5

Exact same here for apex legends and Easy anti cheat.