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0x000000DFBSODCritical

0x000000DF — Impersonating Worker Thread | Blue Screen Fix Guide

IMPERSONATING_WORKER_THREAD

Windows XPWindows VistaWindows 7Windows 8Windows 10Windows 11

What Does 0x000000DF Mean?

A worker thread was found to be impersonating a user, which should not happen as worker threads are shared resources.

Real-World Causes

  1. 1Driver leaving impersonation token on worker thread
  2. 2Security violation in driver
  3. 3Kernel worker thread misuse

Symptoms

  • ⚠Blue screen with stop code IMPERSONATING_WORKER_THREAD
  • ⚠System reboots unexpectedly
  • ⚠Possible data loss from unsaved work

DIY Fix

Beginner-friendly steps you can try at home

  1. 1Restart your computer
  2. 2Run full antivirus scan
  3. 3Run System File Checker (sfc /scannow)
  4. 4Check Windows Update

Advanced Fix

For experienced users and IT professionals

  1. 1Analyze minidump for security subsystem failure
  2. 2Check security event logs
  3. 3Verify system file integrity with DISM
  4. 4Review Group Policy and security settings

Frequently Asked Questions

What causes IMPERSONATING_WORKER_THREAD?
A worker thread was found to be impersonating a user, which should not happen as worker threads are shared resources.
Can I fix Impersonating Worker Thread myself?
In many cases yes. Start with basic troubleshooting like restarting, updating drivers, and running System File Checker. If the issue persists, advanced analysis of crash dumps may be needed.

Related Error Codes

0x000000E4Worker Invalid0x000000E1Worker Thread Returned at Bad IRQL

About the Author

Windows Troubleshooting Team

Verified against official Microsoft documentation and real-world diagnostic data. Error behavior confirmed across Windows 10, Windows 11, and Windows Server.