# Re: \[PATCH v2 20/22\] selftests: futex: Test sys\_futex\_waitv() timeout

- From: Vasily Gorbik \<gor@linux.ibm.com\>
- Date: 2021-11-09 11:19:11 
- List: linux-api
- Page: https://ratatoskr.run/linux-api/2021/11/1566807
- Thread: https://ratatoskr.run/linux-api/2021/09/1519841/t.md

```text
On Thu, Sep 23, 2021 at 02:11:09PM -0300, André Almeida wrote:
> Test if the futex_waitv timeout is working as expected, using the
> supported clockid options.

> +	/* futex_waitv with CLOCK_MONOTONIC */
> +	if (futex_get_abs_timeout(CLOCK_MONOTONIC, &to, timeout_ns))
> +		return RET_FAIL;
> +	res = futex_waitv(&waitv, 1, 0, &to, CLOCK_MONOTONIC);
> +	test_timeout(res, &ret, "futex_waitv monotonic", ETIMEDOUT);
> +
> +	/* futex_waitv with CLOCK_REALTIME */
> +	if (futex_get_abs_timeout(CLOCK_REALTIME, &to, timeout_ns))
> +		return RET_FAIL;
> +	res = futex_waitv(&waitv, 1, 0, &to, CLOCK_REALTIME);
> +	test_timeout(res, &ret, "futex_waitv realtime", ETIMEDOUT);

Hi André,

when built with -m32 and run as compat this two futex_waitv calls hang
on x86 and s390 (noticed while wiring up futex_waitv). The rest of the
futex selftests pass. This suggests some common compat issue? Any ideas?

diff --git a/tools/testing/selftests/futex/functional/Makefile b/tools/testing/selftests/futex/functional/Makefile
index 5cc38de9d8ea..ddcb597d13ea 100644
--- a/tools/testing/selftests/futex/functional/Makefile
+++ b/tools/testing/selftests/futex/functional/Makefile
@@ -1,7 +1,7 @@
 # SPDX-License-Identifier: GPL-2.0
 INCLUDES := -I../include -I../../ -I../../../../../usr/include/ \
        -I$(KBUILD_OUTPUT)/kselftest/usr/include
-CFLAGS := $(CFLAGS) -g -O2 -Wall -D_GNU_SOURCE -pthread $(INCLUDES)
+CFLAGS := $(CFLAGS) -g -m32 -O2 -Wall -D_GNU_SOURCE -pthread $(INCLUDES)
 LDLIBS := -lpthread -lrt
 
 HEADERS := \
--
```