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+# Tracy CUDA Graph GPU Zone Repro
+
+Demonstrates that unpatched Tracy fails to show GPU zones for kernels
+launched via CUDA Graphs (`cudaGraphLaunch`).
+
+## Root cause
+
+When kernels are launched through CUDA Graphs, CUPTI delivers
+`CONCURRENT_KERNEL` and `MEMCPY` activity records but no corresponding
+API callback fires for the individual kernel launches. Tracy's
+`matchActivityToAPICall()` always fails, and `matchError()` silently
+drops every GPU zone.
+
+## Build and run
+
+```bash
+make
+./repro
+```
+
+## What to expect
+
+| Tracy version | GPU zones shown |
+|---|---|
+| Unpatched | 0 |
+| Patched (cuda-graph-gpu-zones.patch) | ~30 (10 launches x 3 ops) |
+
+## The graph structure
+
+Each graph launch contains:
+1. `vector_add` kernel (c = a + b)
+2. Device-to-device memcpy
+3. `vector_add` kernel (c = a + c)
+
+The graph is launched 10 times, so 30 GPU operations total.