How to fix KMODE abnormal unhandled BSOD
In the latest installment of this continuous series, various Windows stop errors or error checking-also known as Blue screen of death For the “blue screen of death”-we have delved into the KMODE exception unhandled error. It requires an error code value of 0X0000001E (also written as 0X1E, removing leading zeros between X and larger numbers). This particular error is an all-encompassing thing.In fact, its Microsoft documentation page Observe that when this error occurs, it “indicates that the kernel-mode program generated an exception that the error handler did not catch.” Therefore, it represents a fallback error handler, which indicates that some unexpected and unplanned exception occurred. .
Windows kernel mode is where the operating system operates
No coincidence, my preferred reference for the internal structure of Windows is an MS Press book of the same name-in this case, Windows internal structure, part 1 (Mark Russinovich, David Solomon, and Alex Ionescu, 6th edition, 2015). Kernel mode was discussed early in this book, and I am summarizing the contents of pages 17 to 20.
First of all, here is a definition Kernel mode: “…An execution mode in the processor that allows access to all system memory and all CPU instructions.” In other words, this access mode provides unlimited access to the runtime environment, CPU, and all connected devices , Omnipotent access and control level. In short, this is an access level that only the most important components of the Windows operating system can enjoy.
Oh, and a more important kernel mode resides: “The kernel mode operating system and device driver code share a virtual address space.” That is, they run together and share the same address space and resources. This largely explains why drivers pop up so frequently when discussing BSOD: Windows has thousands of drivers, and each driver is the source of potential problems. Alas, sometimes this potential will be realized, and blue screens of death will occur.
The book emphasizes “be careful when loading third-party device drivers.” Why? Because once loaded, its code can fully access operating system data. This book clearly marks this design as a “weakness” and points out that it explains the “necessity of the driver signing mechanism introduced in Windows, which warns… if you try to add an unsigned… driver, use The mechanism”.
The driver may cause an unhandled KMODE exception
Although not all errors that cause this blue screen can be directly or indirectly traced to driver issues, most of them are related to device or firmware issues. Therefore, when a BSOD marked as KMODE EXCEPTION NOT HANDLED appears, additional explanatory text may sometimes appear. Each such text item points you to a specific direction for further investigation, if and when:
- file name (For example, ntfs.sys, netio.sys, ndis.sys, tcpip.sys, iastora.sys, etc.). This provides information about the name of a file from which the error originated. It points to system aspects or components where further investigation will be helpful. Ntfs.sys points to the NT file system, which points to disk drives and file access. Ndis.sys points to the Windows network driver interface specification, which points to the network interface and access. TCP/IP is the preferred network protocol for Windows network and Internet access. Iastor is part of Intel Rapid Storage Technology (RST) and is usually associated with drive arrays or high-end, high-speed storage devices.
- Overclocking: Indicates that the failure is related to the basic, CPU or memory clock frequency on the PC (usually only on systems that are deliberately overclocked). It is usually best to turn off overclocking or exit from the current timing level.
- RAM: Indicates that a memory failure may be the source of the error. Usually need to replace one or more memory modules to repair.
- USB: It may indicate that there is a problem with the USB driver (may be ejected at the class, controller, or device level) or the USB device is faulty or malfunctioning. It can be easily checked by unplugging all USB devices except the mouse and keyboard. Assuming these are working properly, please plug in other USB devices one at a time until the error reappears.
- Not processed during installation: Indicates that a failure occurred during the installation of the operating system, which is related to a damaged or invalid driver that is incompatible with your PC.
- Ring: Usually associated with graphics card drivers that cannot be loaded, causing the operating system to try to load them repeatedly but fail (in a loop, as far as the error text itself is concerned). Usually the graphics card driver needs to be replaced (or occasionally the graphics card itself needs to be replaced).
Damaged/missing device drivers may cause KMODE exceptions to be unhandled
If drivers are missing, they will show up as unknown devices in the Device Manager. Since Windows cannot find the driver itself, you must dig deeper into the “Details” tab of such devices. You can use the hardware ID information (see the screenshot below) to find the device and find the related driver.
Usually, information about BSOD points you to a specific device or driver. The best way is to take an image backup of your system (if the situation gets worse, you can always revert to that backup), and then replace the existing driver with a known good working copy of the same version, if not newer Version available.
On the other hand, if the newer driver does not help (which may be the case on older systems), you may need to install the older driver instead of the newer driver.Sites such as Station driver Maintain driver files that can be traced back to 5 years or more. It is a good source for new drivers that you find on the OEM site, and old drivers that are no longer provided by the OEM.
Unhandled KMODE abnormal network driver error and repair
If you receive a text string containing any of the following: netio.sys, ndis.sys, tcpip.sys, etc., all of these points to a network problem. NDIS is the basis of all network interface drivers, and netio refers to the ability to send and receive data through it. TCP/IP is the main network protocol stack for sending and receiving information over the network.
For all these problems, the best way is to uninstall the current network interface driver in the Device Manager, and then restart your PC. During the boot process, Windows should try to find and install the latest (and valid) network driver on your behalf. If this doesn’t work, you will have to go to a site like the site driver linked earlier to find a driver that can run on your specific PC. warn: The older your PC, the more interesting and challenging this exercise will be. The short version of this particular fix is: update network drivers!
Antivirus conflicts may cause unhandled KMODE exceptions
Some reports accuse specific antivirus programs as the culprit for the BSOD marked KMODE EXCEPTION NOT HANDLED. If the previous solutions did not provide any help, you can try to pause or uninstall your antivirus software (assuming it is not Windows Defender) and see if it helps.
If it does help, there is no longer any reason to avoid Windows Defender as your preferred AV protection.Now its rating is as high as most third-party commercial packages on these rating sites AV-Compare and Virus bulletin.
Still having problems?Try repair techniques
If none of the previous suggestions helped your situation (they should apply to more than 90% of readers), I suggest running the following command on the command line:
DISM /online /cleanup-image /restorehealth SFC /Scannow
If none of these solve the problem, then it’s time to run a Repair installation of Windows. If you are still unhappy, then your only remaining option is to clean install Windows (10 or 11, whatever your version is), hope this will cure your illness in the end.