⚠️ 3 verified solutions available for Error 105 — Last updated 2026-03-13
Error 105 📋

How to Fix ERROR_SEM_OWNER_DIED (Error 105)

Error 105, or ERROR_SEM_OWNER_DIED, occurs when a semaphore's previous owner has ended, causing system instability. This error typically arises in multi-threaded environments where synchronization is crucial. Resolving this issue requires understanding its causes and applying the correct fixes.

🏷️ Code: 105 📛 ERROR_SEM_OWNER_DIED 📅 Updated: 2026-03-13 ⏱️ 3 Solutions

🎮 Common Scenario: Are you experiencing Error 105 while launching or installing AutoCAD? The solutions below directly address the system interactions specific to this application.

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💡 What is Error 105?

The ERROR_SEM_OWNER_DIED error, represented by the code 105, signifies that a semaphore, which is a variable used to control access to a common resource by multiple threads, has lost its owner. This can happen due to various reasons such as a thread terminating unexpectedly or a process crashing, leading to the semaphore being left in an unstable state. When this error occurs, it can lead to system freezes, crashes, or unpredictable behavior, especially in applications that rely heavily on multi-threading for their functionality. Understanding the role of semaphores in synchronizing access to shared resources is key to diagnosing and fixing this error. In Windows systems, semaphores are used to prevent race conditions and ensure that only a specified number of threads can access a resource simultaneously. The termination of the owning process or thread can leave the semaphore in a state where it cannot be properly released, hence triggering the ERROR_SEM_OWNER_DIED error.

⚠️ Common Causes

  • Abrupt termination of a process or thread that owned a semaphore
  • Inadequate error handling in multi-threaded applications
  • System crashes or blue screen of death (BSOD) due to driver issues

Step-by-Step Solutions

1 Basic Troubleshooting
  1. Restart your computer to see if the error resolves itself
  2. Check for any recent software updates and install them
  3. Run a virus scan to ensure your system is free from malware
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Show Advanced Solutions (2 more)
2 System File Checker
  1. Open Command Prompt as Administrator
  2. Run the command 'sfc /scannow' to scan and repair corrupted system files
3 Advanced fix
  1. Use the Windows Task Manager to identify and terminate any problematic processes
  2. Use the Registry Editor to manually adjust semaphore settings, if necessary, with caution

🛡️ Prevention Tips

  • Regularly update your operating system and software
  • Implement robust error handling in multi-threaded applications
  • Monitor system resource usage to prevent overload
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Last updated: 2026-03-13
📖
Based on Official Microsoft Documentation
Solutions Tested on Windows 10 & 11
Error codes sourced from Microsoft Win32 SDK. Updated 2026-03-13.
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