A method, apparatus, and/or computer program product protects a managed runtime from stack corruption due to native code condition handling. A native condition handler, which is associated with a managed runtime, percolates a condition. A condition handler of the managed runtime receives notification of the condition in a native code portion, and the condition handler of the managed runtime marks a thread associated with the condition. Responsive to a determination by the native code handler to resume execution of the marked thread by either call back into or a return to the managed runtime, the managed runtime determines whether a request is associated with the marked thread. Responsive to a determination that the request is associated with the marked thread, the managed runtime performs diagnostics and the managed runtime is terminated.