[LTP] futex_wait06: Add EFAULT error coverage test

[linuxtestproject.agent@gmail.com]

Hi Michael,

On Tue, 26 May 2026 22:04:27 +0300, Michael Menasherov wrote:
> futex_wait06: Add EFAULT error coverage test

--- [PATCH 1/4] futex_wait06: Add EFAULT error coverage test ---

> diff --git a/runtest/syscalls b/runtest/syscalls
> [...]
> +futex_cmp_requeue03 futex_cmp_requeue03
> [...]
> +futex_wait07 futex_wait07
> [...]
> +futex_wake05 futex_wake05

The runtest entries for futex_wait07, futex_wake05, and
futex_cmp_requeue03 belong in the commits that introduce those tests,
not here. As-is, if the first commit is applied alone (e.g. during
bisect) the runtest file references binaries that don't exist yet.

--- [PATCH 3/4] futex_wake05: Add EFAULT error coverage test ---

> +#include <sys/mman.h>
> +#include "futextest.h"

Missing blank line between system and local includes.

--- [PATCH 4/4] futex_cmp_requeue03: Add EFAULT error coverage test ---

> + * uaddr2 is only reached after *uaddr == val passes; both are
> + * FUTEX_INITIALIZER so the comparison succeeds.

This is inaccurate. The kernel calls get_futex_key() for both uaddr
and uaddr2 before performing the *uaddr == val comparison, so uaddr2
is validated regardless of the comparison outcome. The test still
works correctly since futex_var == FUTEX_INITIALIZER == val, but the
comment should be fixed.

---
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