How To Fix /SMB/Q2P035 - The release of a semaphore is locked

SAP Error Message - Details

• Message type: E = Error

• Message class: /SMB/Q2P -

• Message number: 035

• Message text: The release of a semaphore is locked

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message /SMB/Q2P035 - The release of a semaphore is locked ?

  The SAP error message /SMB/Q2P035 The release of a semaphore is locked typically indicates an issue related to semaphore management in the SAP system. Semaphores are used in programming to control access to shared resources by multiple processes, and this error suggests that a semaphore release operation is being blocked or is not functioning as expected.
  Cause:
  
  Deadlock Situation: The semaphore may be in a deadlock state where two or more processes are waiting for each other to release resources.
  Resource Contention: Multiple processes may be trying to access the same resource simultaneously, leading to contention and locking issues.
  Improper Semaphore Handling: There may be a bug in the code that improperly handles semaphore operations, such as not releasing a semaphore after it has been acquired.
  System Configuration Issues: Configuration settings related to semaphores in the operating system or SAP environment may not be optimal.
  
  Solution:
  
  Check for Deadlocks: Use transaction codes like SM50 or SM66 to monitor active processes and identify any deadlocks. You may need to terminate one of the processes to resolve the deadlock.
  Review Code: If you have custom code that uses semaphores, review it to ensure that semaphores are being properly acquired and released.
  Increase Semaphore Limits: If resource contention is an issue, consider increasing the limits for semaphores in the operating system configuration. This may involve adjusting kernel parameters (e.g., sem, shm, etc.) on Unix/Linux systems.
  Restart the Application: In some cases, restarting the affected application or the entire SAP system may resolve temporary locking issues.
  Check SAP Notes: Look for relevant SAP Notes that may address this specific error. SAP frequently updates its knowledge base with solutions for known issues.
  Consult SAP Support: If the issue persists, consider reaching out to SAP support for assistance, especially if it is affecting production systems.
  
  Related Information:
  
  Monitoring Tools: Use SAP monitoring tools to keep an eye on system performance and resource usage.
  Documentation: Review SAP documentation related to semaphore management and system performance tuning.
  Kernel Parameters: Familiarize yourself with the kernel parameters related to semaphores on your operating system, as these can significantly impact performance and stability.
  
  By following these steps, you should be able to diagnose and resolve the semaphore locking issue in your SAP environment.