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From:   Florian Weimer <fweimer@redhat.com>
To:     Thomas Gleixner <tglx@linutronix.de>
Cc:     LKML <linux-kernel@vger.kernel.org>,
        Peter Zijlstra <peterz@infradead.org>,
        Ingo Molnar <mingo@kernel.org>,
        Darren Hart <darren@dvhart.com>,
        Yi Wang <wang.yi59@zte.com.cn>,
        Yang Tao <yang.tao172@zte.com.cn>,
        Oleg Nesterov <oleg@redhat.com>,
        Carlos O'Donell <carlos@redhat.com>,
        Alexander Viro <viro@zeniv.linux.org.uk>
Subject: Re: [patch 00/12] futex: Cure robust/PI futex exit races
References: <20191106215534.241796846@linutronix.de>
        <87zhh78gnf.fsf@oldenburg2.str.redhat.com>
Date:   Thu, 07 Nov 2019 23:40:43 +0100
In-Reply-To: <87zhh78gnf.fsf@oldenburg2.str.redhat.com> (Florian Weimer's
        message of "Thu, 07 Nov 2019 23:29:08 +0100")
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* Florian Weimer:

> * Thomas Gleixner:
>
>> The series is also available from git:
>>
>>   git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git WIP.locking/=
futex
>
> I ran the glibc upstream test suite (which has some robust futex tests)
> against b21be7e942b49168ee15a75cbc49fbfdeb1e6a97 on x86-64, both native
> and 32-bit/i386 compat mode.
>
> compat mode seems broken, nptl/tst-thread-affinity-pthread fails.  This
> is probably *not* due to
> <https://bugzilla.kernel.org/show_bug.cgi?id=3D154011> because the failur=
e
> is non-sporadic, but reliable fails for thread 253:
>
> info: Detected CPU set size (in bits): 225
> info: Maximum test CPU: 255
> error: pthread_create for thread 253 failed: Resource temporarily unavail=
able
>
> I'm running this on a large box as root, so ulimits etc. do not apply.
>
> I did not see this failure with the x86-64 test.
>
> You should be able to reproduce with (assuming you've got a multilib gcc)=
:
>
> git clone git://sourceware.org/git/glibc.git git
> mkdir build
> cd build
> ../git/configure --prefix=3D/usr CC=3D"gcc -m32" CXX=3D"g++ -m32" --build=
=3Di686-linux
> make -j`nproc`
> make test t=3Dnptl/tst-thread-affinity-pthread

Sorry, I realized that I didn't actually verify that this is a
regression caused by your patches.  Maybe I can do that tomorrow.

Florian