Windows stopped with a DRIVER_VERIFIER_IOMANAGER_VIOLATION bug check because Driver Verifier detected an I/O verification violation in a kernel driver. This stop code is usually seen while Driver Verifier is enabled and points strongly to a buggy driver.
Driver Verifier is enabled and a kernel driver triggered an I/O verification violation.
A buggy driver freed or misused IRPs or other I/O manager objects incorrectly.
A low-level storage, filter, or device-management driver violated expected I/O lifecycle rules.
How to fix it
Identify the failing driver from the crash dump or Verifier output and update, remove, or roll it back.
If the system is stuck in a crash loop because Driver Verifier is enabled, boot into Safe Mode or recovery and disable Verifier temporarily to recover normal startup.
Focus on recently installed low-level drivers first, especially storage, antivirus, endpoint, or hardware-management components.
Only re-enable Driver Verifier after you have narrowed the suspect driver set so you can confirm the system is stable.
