Bug#1126312: golang-1.25: FTBFS on s390x: TestTSAN: ThreadSanitizer: CHECK failed: tsan_platform_linux.cpp:571

On Thu, 29 Jan 2026 at 02:35, Pranav P <[email protected]> wrote:
> I was going through goenv.sh and found out that a
> s390x-linux-gnu-g(cc/++) cross compiler is being used for compilation.
> We verified the same failure is seen in the upstream repo even on other
> distributions when using a cross-compiler. Why is the cross-compiler needed and
> not the native compiler enough? Is there a specific need.
> Because this failure is not seen with the native compiler (other than for a segfault
> seen in tsan8 testcase which we will be working on)
> Also, for reference I had checked Ubuntu's packaging. They are also using the native
> compiler.

Thanks for taking a look!  To clarify, the cross-compiler is *only*
used when cross compiling, which isn't something the official buildds
will ever invoke (and that's where I'm pulling that failure from).

Within Debian, "s390x-linux-gnu-g(cc/++)" is a native compiler when on
the native architecture.

So unless something is going very wrong, the build logs I've provided
should be from the native compiler (with CGO_ENABLED=1 explicitly
enabled).

♥,
- Tianon