# go: github.com/example/lib@v0.2.5: verifying module: checksum mismatch

- **ID:** `go/module-cache-corruption`
- **Domain:** go
- **Category:** module_error
- **Verification:** ai_generated
- **Fix Rate:** 80%

## Root Cause

Local module cache corruption or go.sum file tampering causing checksum mismatch.

## Version Compatibility

| Version | Status | Introduced | Deprecated |
|---------|--------|------------|------------|
| 1.16 | active | — | — |
| 1.17 | active | — | — |

## Workarounds

1. **清除模块缓存并重新下载** (80% success)
   ```
   go clean -modcache
cd $GOPATH/pkg/mod && rm -rf github.com/example/lib@v0.2.5
go mod download
   ```
2. **使用GONOSUMCHECK绕过校验** (50% success)
   ```
   export GONOSUMCHECK=github.com/example/lib
go mod download
   ```

## Dead Ends

- **手动删除go.sum文件** — go.sum是必需的，删除后go mod verify会重新生成，但可能仍然不匹配。 (60% fail)
- **复制其他项目的go.sum文件** — go.sum依赖于特定版本和依赖树，复制会导致更多错误。 (90% fail)