ERROR_MUTANT_LIMIT_EXCEEDED - 587 (0x24B)
An attempt was made to acquire a mutant such that its maximum count would have been exceeded.
Updated: Feb 21, 2026
Technical Meaning
The ERROR_MUTANT_LIMIT_EXCEEDED error indicates that an attempt was made to acquire a mutant object, which would have exceeded its maximum allowed count. Mutants are synchronization objects used in the Windows operating system for managing shared resources and ensuring proper access.
Error Details
Mutant objects are used to control access to critical sections of code or data structures. Each mutant has an associated count that tracks the number of threads currently holding it. When a thread attempts to acquire a mutant, its count is incremented. If this operation would cause the count to exceed the maximum allowed value for the mutant, the system generates the ERROR_MUTANT_LIMIT_EXCEEDED error.
Usage Context
This error typically occurs in scenarios where multiple threads are attempting to access shared resources protected by mutants. It can also arise when there is a programming error or an issue with resource management that leads to excessive attempts to acquire the same mutant.
Developer Interpretation
Developers should interpret this error as an indication of potential issues with thread synchronization or resource management in their code. The error suggests that either the maximum count for a mutant has been set too low, or there is a race condition or deadlock situation occurring within the application.
Related Errors
ERROR_MUTANT_NOT-Owned(420): Indicates that a thread tried to release a mutant it does not own.STATUS_MUTANT_CLOSE_FAILED(871): Occurs when an attempt to close a mutant fails due to ownership issues.STATUS_MUTANT_OPENED(936): Suggests that the mutant was successfully opened but may have been in use by another thread.
FAQ
Q: What does the ERROR_MUTANT_LIMIT_EXCEEDED error mean?
A: It means an attempt to acquire a mutant would exceed its maximum count, indicating potential issues with synchronization or resource management.
Q: How can I resolve this issue?
A: Review your thread synchronization logic and ensure that mutants are properly managed. Check for race conditions or deadlocks in your code and adjust the maximum count of mutants if necessary.
Summary
The ERROR_MUTANT_LIMIT_EXCEEDED error is a specific technical issue related to resource management and synchronization within Windows applications. It highlights potential problems with how mutants are being used, which can be addressed by reviewing and refining thread synchronization practices.