How To Fix LM_SEMAPHORE031 - Inserting list of allowed processes failed (&1, &2)

SAP Error Message - Details

• Message type: E = Error

• Message class: LM_SEMAPHORE - Messages for LM Sempahore Handling

• Message number: 031

• Message text: Inserting list of allowed processes failed (&1, &2)

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message LM_SEMAPHORE031 - Inserting list of allowed processes failed (&1, &2) ?

  The SAP error message LM_SEMAPHORE031 indicates that there was a failure in inserting a list of allowed processes, which is typically related to the management of semaphores in the SAP system. This error can occur in various scenarios, often related to the configuration of the SAP system or issues with the underlying operating system.
  Cause:
  
  Configuration Issues: The error may arise due to incorrect configuration settings in the SAP system, particularly in the instance profile or the semaphore settings.
  Operating System Limits: The operating system may have reached its limit for semaphores or shared memory segments, which can prevent the SAP system from allocating the necessary resources.
  Permissions: Insufficient permissions for the user or the SAP instance to modify semaphore settings can also lead to this error.
  Resource Conflicts: Conflicts with other applications or processes that are using semaphores can cause this error.
  
  Solution:
  
  Check Instance Profile: Review the instance profile parameters related to semaphores and ensure they are correctly configured. Look for parameters like rdisp/wp_no_dia, rdisp/wp_no_btc, etc.
  Operating System Configuration: 
  
  For Unix/Linux systems, check the semaphore limits using commands like ipcs -s and adjust the kernel parameters (e.g., SEM, SHM) in the /etc/sysctl.conf file or using sysctl commands.
  For Windows systems, ensure that the system has enough resources allocated for semaphores.
  
  
  Permissions: Ensure that the SAP instance has the necessary permissions to modify semaphore settings. This may involve checking user permissions or running the SAP instance with elevated privileges.
  Restart SAP Services: Sometimes, simply restarting the SAP services can resolve temporary issues related to semaphore allocation.
  Check Logs: Review the SAP system logs (e.g., dev_w* files) for more detailed error messages that can provide additional context on the issue.
  Consult SAP Notes: Check the SAP Support Portal for any relevant SAP Notes that may address this specific error or provide additional troubleshooting steps.
  
  Related Information:
  
  SAP Kernel Version: Ensure that you are using a supported and up-to-date version of the SAP kernel, as bugs in older versions may lead to such errors.
  System Resources: Monitor system resources (CPU, memory, etc.) to ensure that the server is not under heavy load, which could affect semaphore allocation.
  Documentation: Refer to the official SAP documentation for your specific version for detailed information on semaphore management and configuration.
  
  If the issue persists after trying the above solutions, it may be beneficial to contact SAP support for further assistance.