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cpp-sanitizers

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Use in C/C++ projects for crashes, hangs, UB, data races, memory errors. ASan/UBSan/TSan runtime checks. Build sanitizer config separately.

skills/cpp-sanitizers/SKILL.md

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# C/C++ Sanitizers — Runtime Bug Catchers

Sanitizers are compiler-instrumented runtime checks. They catch what static analysis can't (path-sensitive errors, race conditions, memory errors discovered at runtime). They run your normal tests under instrumentation; failures abort with a precise report.

| Sanitizer | What it catches | Slowdown |
|---|---|---|
| **ASan** (Address) | Use-after-free, heap/stack overflow, leaks (leaks: Linux only) | 2-3x |
| **UBSan** (UB) | Signed overflow, null deref, misaligned, OOB shift, ... (MSVC: unavailable — see Platform notes) | ~1.1x |
| **TSan** (Thread) | Data races, deadlocks (not available on Windows — see Platform notes) | 5-10x |
| **MSan** (Memory) | Use of uninitialized memory | 3x (Linux only, Clang only) |

Note: ASan + UBSan are combinable. TSan is **mutually exclusive** with ASan/MSan.

## The `/sanitize` command
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