ErrorFindly
0x00000039BSODCritical

0x00000039 — System Exit Owned Mutex | Blue Screen Fix Guide

SYSTEM_EXIT_OWNED_MUTEX

Windows XPWindows VistaWindows 7Windows 8Windows 10Windows 11

What Does 0x00000039 Mean?

A thread exited while still owning a mutex, which could lead to deadlocks.

Real-World Causes

  1. 1Driver not releasing mutex before thread exit
  2. 2Driver unload error
  3. 3Kernel synchronization bug

Symptoms

  • ⚠Blue screen with stop code SYSTEM_EXIT_OWNED_MUTEX
  • ⚠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 System File Checker (sfc /scannow)
  3. 3Check Windows Update
  4. 4Run DISM /Online /Cleanup-Image /RestoreHealth

Advanced Fix

For experienced users and IT professionals

  1. 1Analyze minidump with WinDbg
  2. 2Check Event Viewer for correlated errors
  3. 3Use Process Monitor to trace system activity
  4. 4Perform clean boot to isolate the cause

Frequently Asked Questions

What causes SYSTEM_EXIT_OWNED_MUTEX?
A thread exited while still owning a mutex, which could lead to deadlocks.
Can I fix System Exit Owned Mutex 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

0x000000BFMutex Already Owned0x0000000DMutex Level Number Violation

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.