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ERROR_ILLEGAL_DLL_RELOCATION
What this result means
ERROR_ILLEGAL_DLL_RELOCATION is a Windows system result. The loader detected an address-layout conflict involving a DLL that the application expects at a particular location. Historically this appeared with incompatible updates or binaries that made unsafe fixed-address assumptions.
Likely causes
- an outdated executable assumes a system DLL base address
- incompatible or partially installed system files changed layout
- a third-party module injected early and occupied required address space
- the executable or DLL has malformed relocation information
How to diagnose it
Capture the named DLL and conflicting module from the full error text, executable and module versions, signatures, update history, loaded-module order, and architecture. Verify system-file integrity after preserving logs.
Correct handling
Update or replace the incompatible application, complete servicing, and remove unsupported injected modules. Do not disable ASLR globally or replace system DLLs manually. Rebuild binaries with valid relocation data.
Where this code is usually encountered
- A legacy executable assumes a fixed DLL address that conflicts with the current system layout.
- A partially serviced machine contains binaries from incompatible revisions.
- Injected software occupies or alters loader state before a protected module is mapped.
Evidence worth collecting
- the DLL and executable named in the complete message
- file versions, signatures, architecture, and image bases
- loaded-module order and injection products
- update, rollback, and pending-servicing history
Practical diagnostic sequence
- Verify signatures and versions before replacing any file.
- Test the executable on a fully serviced clean machine of the same architecture.
- Disable only the identified third-party injection component in a controlled test.
- Rebuild or update the application when its image lacks valid relocation information.
Guidance for developers
Build binaries with relocation data and ASLR compatibility; never depend on system DLL base addresses. Loader failures should include both conflicting image names and their versions in telemetry.
Guidance for administrators
Complete or roll back servicing with supported tools. Do not disable ASLR globally or download individual system DLLs from unrelated machines.
How to interpret it correctly
A missing DLL is a dependency-resolution problem. Illegal relocation means the loader found the image but cannot map the set of images safely.
Example failure pattern
A useful module map records preferred image bases, actual mappings, relocation availability, signatures, and load order. This often shows whether the executable has an obsolete fixed-address assumption or whether an early injected DLL changed the address-space layout.
Retry and recovery policy
Repeated process launch will normally fail identically. Retry only after updating the application, completing servicing, or removing the identified incompatible module; random reboot success is not evidence of a sound fix.
Suggested telemetry
For ERROR_ILLEGAL_DLL_RELOCATION, record the operation name, component version, process and thread identity, the original numeric result, the immediately preceding state transition, and a correlation identifier. Keep the ERROR_ILLEGAL_DLL_RELOCATION event separate from later fallback failures so its first actionable cause remains searchable across machines.
References
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