On Thursday, December 18, 2025 at 6:03:20 PM UTC-7 [email protected] wrote:
In 16 years of Go's existence, neither Google nor the community has solved
the race detection problem without CGO. ThreadSanitizer requires
CGO_ENABLED=1,
which makes it unusable for Docker scratch images, cloud functions,
cross-compilation, and embedded systems.
You can use race detection with scratch images if you include the required
libraries. Example:
*$ cat hello.go*
package main
import "fmt"
func main() {
fmt.Println("Hello World")
}
*$ CGO_ENABLED=1 go build -race .*
*$ ldd ./hello | tr -s [:blank:] '\n' | grep ^/ | xargs -I % install -D %
./%*
*$ tree*
.
├── Dockerfile
├── go.mod
├── hello
├── hello.go
├── lib
│ └── x86_64-linux-gnu
│ └── libc.so.6
└── lib64
└── ld-linux-x86-64.so.2
3 directories, 6 files
*$ cat Dockerfile*
FROM scratch
COPY li[b] /lib
COPY lib64 /lib64
COPY hello /usr/bin/hello
ENTRYPOINT ["/usr/bin/hello"]
*$ docker build -t hello:latest -f Dockerfile .*
...
...
=> => naming to docker.io/library/hello:latest 0.0s
*$ dive --json /dev/stdout hello:latest | grep path*
"path": "lib/x86_64-linux-gnu/libc.so.6",
"path": "lib/x86_64-linux-gnu",
"path": "lib",
"path": "lib64/ld-linux-x86-64.so.2",
"path": "lib64",
"path": "usr/bin/hello",
"path": "usr/bin",
"path": "usr",
*$ docker run --rm hello:latest*
Hello World
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