ERROR_PAGE_FAULT_DEMAND_ZERO - 748 (0x2EC)
Page fault was a demand zero fault.
Updated: Feb 21, 2026
Technical Meaning
The ERROR_PAGE_FAULT_DEMAND_ZERO (748) is a specific type of page fault that occurs when the memory manager encounters an attempt to access a virtual address that has been mapped to zero. This typically indicates that the requested memory location does not contain valid data and may be uninitialized or invalid.
Error Details
A demand zero fault happens during a memory reference where the operating system expects a specific value (usually zero) at a particular memory address, but finds that no such mapping exists. This can occur in various scenarios, including invalid pointers, out-of-bounds array access, or uninitialized variables.
Usage Context
This error is commonly encountered in kernel-mode drivers and user-mode applications when they attempt to dereference an invalid pointer or access a non-existent memory location. It is also relevant in scenarios where the system expects certain memory regions to be zeroed out but finds otherwise.
Developer Interpretation
When this error occurs, it suggests that there is a problem with the memory management or data validation mechanisms within the application or driver. Developers should ensure that all pointers and references are properly initialized and validated before use. Additionally, any operations involving memory allocation or deallocation must be carefully managed to avoid such faults.
Related Errors
ERROR_INVALID_ADDRESS(487)STATUS_ACCESS_VIOLATION(c0000005)STATUS_DATATYPE_MISALIGNMENT(80000002)
FAQ
Q: What does the error mean?
A: The error indicates that a page fault occurred where the memory address was mapped to zero, suggesting an invalid or uninitialized memory reference.
Q: How can I prevent this error?
A: Ensure all pointers and references are properly initialized before use. Validate input data and memory regions to avoid accessing non-existent addresses.
Summary
The ERROR_PAGE_FAULT_DEMAND_ZERO (748) is a specific type of page fault that occurs when the system attempts to access an invalid or uninitialized memory location. Developers should ensure proper memory management practices to prevent such errors.