fix(vmm): resolve musl CRT mismatch crash and improve startup diagnostics#372
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DorianZheng merged 2 commits intomainfrom Mar 12, 2026
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…tics On Linux, the project .cargo/config.toml specified `linker = "x86_64-linux-musl-gcc"` which forced Ubuntu's system musl CRT objects (v1.2.2), creating an ABI mismatch with Rust's bundled musl CRT. This caused the guest binary to crash at startup with exit code 0 and no output. Changes: - Remove linker directives from project .cargo/config.toml so Linux uses Rust's self-contained musl linking (macOS still needs musl-cross, configured per-user) - Add setup_musl_linker() to setup-macos.sh for per-user ~/.cargo/config.toml - Add macOS linker env var fallback in build-guest.sh - Add guest_check.rs: ELF pre-flight validation (arch, static linking) before injecting guest binary into rootfs ext4 image - Enhance crash_report.rs: exit-code-0 interpretation, console.log analysis (empty/kernel-only/guest-output), actionable diagnostic commands - Fix latent bug: create logs_dir in box filesystem layout - Promote console output log from debug to info in krun engine Tested on Linux (boxlite-dev GCE): `boxlite run alpine:latest -- echo hello` → hello
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Summary
linker = "x86_64-linux-musl-gcc"from project.cargo/config.toml— Ubuntu's system musl CRT (v1.2.2) was ABI-incompatible with Rust's bundled musl CRT, causing the guest binary to crash at startup with exit code 0 and no outputguest_check.rsvalidates guest binary architecture and static linking before ext4 injection, catching mismatches early with clear error messages~/.cargo/config.toml(viasetup-macos.sh) and added env var fallback inbuild-guest.shTest plan
cargo test -p boxlite --lib -- guest_check(8 tests pass)cargo test -p boxlite --lib -- crash_report(all tests pass)cargo clippy -p boxlite --tests -- -D warnings(clean)cargo fmt --check(clean)boxlite run alpine:latest -- echo hello→hello(boxlite-dev GCE)