How To Fix ITS144 - Shared memory locked

SAP Error Message - Details

• Message type: E = Error

• Message class: ITS - Messages for Agent-Based ITS Monitor

• Message number: 144

• Message text: Shared memory locked

Self-Explanatory Message

Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.

To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

Unfortunately, there isn't any extra information in this error notice.

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Smart SAP Assistant

• What is the cause and solution for SAP error message ITS144 - Shared memory locked ?

  The SAP error message ITS144 "Shared memory locked" typically indicates that there is an issue with the shared memory segment used by the SAP system. This can occur for various reasons, including system configuration issues, resource contention, or problems with the underlying operating system.
  Causes:
  
  Resource Contention: Multiple processes may be trying to access the shared memory segment simultaneously, leading to a lock.
  Configuration Issues: Incorrect configuration of shared memory parameters in the SAP system can lead to locking issues.
  Operating System Limits: The operating system may have limits on the size or number of shared memory segments that can be created.
  Process Termination: If a process that was using the shared memory segment terminates unexpectedly, it may leave the memory in a locked state.
  Kernel Bugs: In some cases, bugs in the SAP kernel or the underlying operating system can lead to shared memory issues.
  
  Solutions:
  
  Check System Configuration: Review the configuration settings for shared memory in the SAP system. Ensure that parameters such as shmmax, shmmin, and shmni are set correctly according to SAP recommendations.
  Restart the SAP System: Sometimes, a simple restart of the SAP system can resolve the locking issue by releasing the shared memory.
  Clear Locked Memory Segments: If you have access to the operating system, you can check for and clear any locked shared memory segments. This can often be done using commands like ipcs and ipcrm on Unix/Linux systems.
  Check for Zombie Processes: Use system monitoring tools to check for any zombie processes that may be holding onto shared memory. Terminate any that are not needed.
  Increase Shared Memory Limits: If the system is hitting limits, consider increasing the shared memory limits in the operating system configuration.
  Consult SAP Notes: Check the SAP Support Portal for any relevant SAP Notes that may address this specific error or provide patches or updates.
  
  Related Information:
  
  SAP Notes: Always check for specific SAP Notes related to the error message. SAP frequently updates its knowledge base with solutions for known issues.
  System Logs: Review the system logs (such as the developer trace files) for additional context around the error. This can provide insights into what processes were running at the time of the error.
  Operating System Documentation: Consult the documentation for your operating system regarding shared memory management, as the commands and configurations can vary between systems.
  
  If the issue persists after trying the above solutions, it may be necessary to engage SAP support for further assistance.