linux-kernel - Re: [PATCH 0/2] selftests/nolibc: small simplification of test development phase

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Date:   Tue, 24 Jan 2023 02:01:50 +0700
From:   Ammar Faizi <ammarfaizi2@...weeb.org>
To:     "Paul E. McKenney" <paulmck@...nel.org>
Cc:     Willy Tarreau <w@....eu>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Shuah Khan <shuah@...nel.org>,
        Linux Kselftest Mailing List 
        <linux-kselftest@...r.kernel.org>
Subject: Re: [PATCH 0/2] selftests/nolibc: small simplification of test
 development phase

On Mon, Jan 23, 2023 at 09:40:03AM -0800, Paul E. McKenney wrote: 
> I looked for that, but didn't find it, so thank you!
> 
> (Yes, I should have used dpkg, but I was lazy.)
> 
> Except that when I install Ubuntu 20.04's version, I get this:
> 
> ------------------------------------------------------------------------
> 
> $ sudo make run-user
>   MKDIR   sysroot/x86/include
> make[1]: Entering directory '/home/git/linux-rcu/tools/include/nolibc'
> make[2]: Entering directory '/home/git/linux-rcu'
> make[2]: Leaving directory '/home/git/linux-rcu'
> make[2]: Entering directory '/home/git/linux-rcu'
>   INSTALL /home/git/linux-rcu/tools/testing/selftests/nolibc/sysroot/sysroot/include
> make[2]: Leaving directory '/home/git/linux-rcu'
> make[1]: Leaving directory '/home/git/linux-rcu/tools/include/nolibc'
>   CC      nolibc-test
> 32 gettimeofday_null = -1 EFAULT        [FAIL]
> See all results in /home/git/linux-rcu/tools/testing/selftests/nolibc/run.out
> 
> ------------------------------------------------------------------------
> 
> I have attached run.out.
> 
> In contrast, with my hand-built qemu-x86_64, all tests passed.
> 
> This might be just a version-related bug, but figured I should let you
> guys know.

This is an interesting bug.

I'm a bit reluctant to say that this is a qemu bug. But I can't
reproduce it on my machine. I use qemu that comes from Ubuntu 22.04.

FWIW, my qemu version is:

   $ qemu-x86_64 -version
   qemu-x86_64 version 6.2.0 (Debian 1:6.2+dfsg-2ubuntu6.6)
   Copyright (c) 2003-2021 Fabrice Bellard and the QEMU Project developers

I'll take a look at that gettimeofday() code and see if we have a bug in
it. In meantime, could you send your qemu version info?

-- 
Ammar Faizi