linux-kernel - Re: [PATCH v2 20/22] selftests: futex: Test sys_futex

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Date:   Tue, 9 Nov 2021 12:18:21 +0100
From:   Vasily Gorbik <gor@...ux.ibm.com>
To:     André Almeida <andrealmeid@...labora.com>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Darren Hart <dvhart@...radead.org>,
        linux-kernel@...r.kernel.org, Steven Rostedt <rostedt@...dmis.org>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        kernel@...labora.com, krisman@...labora.com,
        linux-api@...r.kernel.org, libc-alpha@...rceware.org,
        mtk.manpages@...il.com, Davidlohr Bueso <dave@...olabs.net>,
        Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH v2 20/22] selftests: futex: Test sys_futex_waitv() timeout

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 := \
--