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War Story: How a Rust 1.85 Memory Leak in Production Cost Us $50k in Cloud Costs Before We Debugged It with pprof

DEV Community·ANKUSH CHOUDHARY JOHAL·6 months ago
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At 3:17 AM on a Tuesday in March 2025, our AWS bill for the month hit $62,400 – $51,200 more than our projected $11,200 baseline. The root cause? A silent memory leak introduced in Rust 1.85’s standard library that we only caught after 14 days of production degradation, using pprof-rs and custom allocation tracking.

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