What does NTSTATUS 0x40000021 (STATUS_WX86_EXCEPTION_LASTCHANCE) mean?

 
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STATUS_WX86_EXCEPTION_CONTINUE STATUS_WX86_EXCEPTION_CHAIN

STATUS_WX86_EXCEPTION_LASTCHANCE

The emulated exception reached its final handling stage

STATUS_WX86_EXCEPTION_LASTCHANCE marks a last-chance path in the Windows x86 emulation subsystem. At this stage, earlier handlers did not complete normal processing, so the surrounding exception chain must be inspected carefully.

Useful evidence

  • The original exception code and faulting instruction before the emulation status.
  • The loaded compatibility modules and their versions.
  • Whether the same 32-bit program fails without debuggers, overlays, or API hooks.
  • The architecture and Windows build on which the issue reproduces.

Remediation

Update the application and compatibility components first. Do not add a handler that simply suppresses the status, because doing so can continue execution with invalid emulation state.

References


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