Warn when Kani runs under Rosetta 2 on Apple Silicon - #4789
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kani --version --verbose now prints the host architecture and warns when the kani-driver process is translated (sysctl.proc_translated == 1): SAT solving under x86_64 translation carries a steep penalty and an x86_64 driver almost always ships x86_64 solver binaries. Warn-only: translation never blocks verification.
This was referenced Sep 8, 2026
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Description
kani --version --verbosenow prints the host architecture on macOS and warns when thekani-driverprocess itself is running translated under Rosetta 2 (sysctl.proc_translated == 1).Context
SAT solving under x86_64 translation carries a steep performance penalty on Apple Silicon, and an x86_64
kani-driveralmost always ships with x86_64 solver binaries (CBMC, Kissat) — so a translated driver is a reliable proxy for a fully translated toolchain. Today nothing tells the user; verification just runs 30–50% slower. The warning is detect-only and never blocks verification.Manual testing
kani --version --verboseon a native arm64 macOS host printsHost architecture: aarch64and no warning.rosetta_warning) and a thinsysctlprobe (is_process_translated), so the warning logic is unit-tested (cargo test -p kani-driver version: 11/11, including probe-never-panics and warning-content tests).false;--quiet's zero-output contract is untouched (the new output lives in the verbose-only path, and version printing is already caller-gated on--quiet).By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 and MIT licenses.