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Received: from j130084.upc-j.chello.nl ([24.132.130.84] helo=noisy.programming.kicks-ass.net) by desiato.infradead.org with esmtpsa (Exim 4.96 #2 (Red Hat Linux)) id 1r2vWT-002X5L-2Q; Tue, 14 Nov 2023 15:40:17 +0000 Received: by noisy.programming.kicks-ass.net (Postfix, from userid 1000) id 1EE74300581; Tue, 14 Nov 2023 16:40:17 +0100 (CET) Date: Tue, 14 Nov 2023 16:40:17 +0100 From: Peter Zijlstra To: Xi Ruoyao Cc: libc-alpha@sourceware.org, linux-kernel@vger.kernel.org, linux-api@vger.kernel.org, linux-mm@kvack.org, linux-arch@vger.kernel.org, Thomas Gleixner , =?iso-8859-1?Q?Andr=E9?= Almeida Subject: Re: Several tst-robust* tests time out with recent Linux kernel Message-ID: <20231114154017.GI4779@noisy.programming.kicks-ass.net> References: <4bda9f2e06512e375e045f9e72edb205104af19c.camel@xry111.site> <20231114153100.GY8262@noisy.programming.kicks-ass.net> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20231114153100.GY8262@noisy.programming.kicks-ass.net> X-Rspamd-Queue-Id: 8579180025 X-Rspam-User: X-Rspamd-Server: rspam05 X-Stat-Signature: nzbyzhhak3sztn5uzw16ewuqzg8ybz3f X-HE-Tag: 1699976422-810056 X-HE-Meta: U2FsdGVkX1/XPPbozDbS73NeMkIb11OUj2LD3tgG7KIq/KPxKyeEF6UbjBReqMSGXhdRMu7MfirPCW6hcALJObXMO7hmzf0B9bhqOspFwmrQPrB8LQ66K2laG6Os+dvrTrih/0N80K0szbrj2TvB7LFmm1knZ6Lq9kvkvF93MRTKPgQuCv/z6vmTJjV4nEUD2wOXltZdFEE1ar1QYtq85FRsXQfg8ilCGJMtXO86kf6S6z5Zjb+NTywx3PLbf9ACKWEkKaSKfA29FfZJ3dw3zC4LXv98dmCgoxiY6dyDPmSgNHn2WfA3Jsuej1/IqE7o9snWd+K/NOVjEKiPO7kreymc0XtBc0p3Trp8G7l47OVDNEz6HRORxK+W5JjVERmDL48ojIVrYerdZ5lULbkaPTrIj4tGmQS+OyqkrWu8REKt+hy9tMxQgEFFNwM+X0gjUgt5gEOgOh19HNqWWmb+feErvkMK+4nzhL2gfrQw6QQ3tW3nfezlKkJ0Bcfg67wnvgUSSnMNXn76r4WXdEtjHHZ61eGxPxjYcl0vaO0oXCwUUVJ+X2sHZsEt4zg3/K7Hy+GYODFLF1ZmzwXzHbdKqoUr2Z8+8zoPD9X467/UI+zPOzQADT7NXMQaNKdhzJTtdhf85s3h5PeglJKhcLmSnqQQRo7B8XpfEGIGw6PU2A2QAK2d5T/+J1/AlRmW49JS7wVhlNVLPohKleo87e3xvWsj+LT01+iKnAx/+q6lq0VODtwBsY3YFkCWD2uRw/KTe19Oe8HxmCGK0FwejVlAtNbRO2Vtq8j/XoRD5xTj2P3ZcmiP2DjPwXZJgoex2lmBVo6U4DeJ/jrV0MTLKNMKfzkMjvZJgiqaxSdcuAhBoFvOcdeFgA3+D9a4UAya3jx0Owf1YeYwM/wrgkB1GBT5XYlswtiHCZYXcUdOuWPbqXnkLlGX/6k19esl6vo3JFoATM8T4B8on9MqVVgxowS chUFIQYH THFAfeIAZHk1vfU3FtA1/zUt1BlziR4sgv/5WfkuBS1avED/kkL89y1J6ZwggrePVQLQ5fcrtnGBiFsUqdxyPvS6SwQOA1H7oodQjG2FDl16loP0h251izu3hZOoQ7TEob/Nbr4li5jQOmWKckCWUKudPj03qVSwWyUMfQXi+nnrnAUF6RMwpJiKCWs84qIwTym0pyhs2dWwJFxDemTjuQHD1dqLwrZiYeu3i8ROlSFtvrfqfwJSxAny0broHgCNP2egH3TZsFdJLH8QKgQ/3EV/Ks5cducrkGM2V7m9kSLoaFEo7nGwRb3cbfrAB8OP3sJDgK+v4GDgy1DxE7789Ciz6hCiZkKK8qvh8+RgLVHhjWIqBrcixfCqbOQ== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Tue, Nov 14, 2023 at 04:31:00PM +0100, Peter Zijlstra wrote: > On Tue, Nov 14, 2023 at 05:46:43PM +0800, Xi Ruoyao wrote: > > On Tue, 2023-11-14 at 02:33 +0800, Xi Ruoyao wrote: > > > Hi, > > > > > > With Linux 6.7.0-rc1, several tst-robust* tests time out on x86_64: > > > > > > FAIL: nptl/tst-robust1 > > > FAIL: nptl/tst-robust3 > > > FAIL: nptl/tst-robust4 > > > FAIL: nptl/tst-robust6 > > > FAIL: nptl/tst-robust7 > > > FAIL: nptl/tst-robust9 > > > > > > This does not happen with Linux 6.6.0.  Do you have some clue about > > > it? > > > > Bisected to the kernel commit: > > > > commit 5694289ce183bc3336407a78c8c722a0b9208f9b (HEAD) > > Author: peterz@infradead.org > > Date: Thu Sep 21 12:45:08 2023 +0200 > > > > futex: Flag conversion > > > > Futex has 3 sets of flags: > > > > - legacy futex op bits > > - futex2 flags > > - internal flags > > > > Add a few helpers to convert from the API flags into the internal > > flags. > > > > Signed-off-by: Peter Zijlstra (Intel) > > Reviewed-by: Thomas Gleixner > > Reviewed-by: Andr Almeida > > Link: https://lore.kernel.org/r/20230921105247.722140574@noisy.programming.kicks-ass.net > > I can confirm. I'm also going crazy trying to figure out how this > happens. > > The below is sufficient to make it unhappy... > > /me most puzzled > > --- > diff --git a/kernel/futex/futex.h b/kernel/futex/futex.h > index b5379c0e6d6d..1a1f9301251f 100644 > --- a/kernel/futex/futex.h > +++ b/kernel/futex/futex.h > @@ -17,7 +17,7 @@ > * restarts. > */ > #ifdef CONFIG_MMU > -# define FLAGS_SHARED 0x01 > +# define FLAGS_SHARED 0x10 > #else > /* > * NOMMU does not have per process address space. Let the compiler optimize Just the above seems sufficient.