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Golang / Golang Internals and Memory Management Interview Questions

What static analysis tools are essential for a Go project and what does each check?

Go's tooling ecosystem provides multiple layers of static analysis, from the built-in go vet to powerful third-party linters. Using them as part of CI prevents entire categories of bugs.

Key Go Static Analysis Tools
ToolCommandWhat it catches
go vetgo vet ./...Misuse of Printf verbs, unreachable code, copying sync.Mutex, shadowed variables, incorrect struct tags
go buildgo build ./...Compile errors, unused imports, missing packages
go test -racego test -race ./...Data races — concurrent unsynchronised memory access
staticcheckstaticcheck ./...Deprecated API use, performance issues, dead code, semantic bugs go vet misses
golangci-lintgolangci-lint runMeta-linter running 50+ linters including vet, staticcheck, errcheck, gocritic
errcheckerrcheck ./...Unchecked error return values (a very common Go bug source)
govulncheckgovulncheck ./...Known vulnerabilities in dependencies (Go's official security scanner)
// .golangci.yml — configuration for golangci-lint in CI
# linters:
#   enable:
#     - govet
#     - staticcheck
#     - errcheck
#     - gosec
#     - misspell
#     - gofmt
#     - revive

// Example: errcheck catches a common bug
os.Remove(tmpFile)  // BAD: ignoring error return
if err := os.Remove(tmpFile); err != nil {  // GOOD
    log.Println("cleanup failed:", err)
}

// go vet catches Printf format mismatches
fmt.Printf("%d", "hello") // go vet: argument "hello" is a string, not int

// govulncheck — check for known CVEs
// go install golang.org/x/vuln/cmd/govulncheck@latest
// govulncheck ./...
// Vulnerability #1: GO-2023-1234 in github.com/vulnerable/pkg@v1.2.3

// Recommended CI pipeline:
// 1. go build ./...
// 2. go vet ./...
// 3. go test -race -count=1 ./...
// 4. golangci-lint run
// 5. govulncheck ./...

What class of bug does 'errcheck' find that 'go vet' misses?
Which Go official tool scans your module's dependencies for known security vulnerabilities?

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