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Received: from shell.armlinux.org.uk ([fd8f:7570:feb6:1:5054:ff:fe00:4ec]:38660) by pandora.armlinux.org.uk with esmtpsa (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.90_1) (envelope-from ) id 1i2caJ-0004zg-HP; Tue, 27 Aug 2019 15:36:35 +0100 Received: from linux by shell.armlinux.org.uk with local (Exim 4.92) (envelope-from ) id 1i2caI-0005om-AW; Tue, 27 Aug 2019 15:36:34 +0100 Date: Tue, 27 Aug 2019 15:36:34 +0100 From: Russell King - ARM Linux admin To: Ulf Hansson Subject: Re: Continuous SD IO causes hung task messages Message-ID: <20190827143634.GL13294@shell.armlinux.org.uk> References: <20190827134337.GK13294@shell.armlinux.org.uk> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.10.1 (2018-07-13) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190827_073643_902928_D9813E7D X-CRM114-Status: GOOD ( 15.10 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: "linux-mmc@vger.kernel.org" , Linux Kernel Mailing List , Linux ARM Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Tue, Aug 27, 2019 at 03:55:23PM +0200, Ulf Hansson wrote: > On Tue, 27 Aug 2019 at 15:43, Russell King - ARM Linux admin > wrote: > > > > Hi, > > > > While dd'ing the contents of a SD card, I get hung task timeout > > messages as per below. However, the dd is making progress. Any > > ideas? > > > > Presumably, mmc_rescan doesn't get a look-in while IO is progressing > > for the card? > > Is it a regression? > > There not much of recent mmc core and mmc block changes, that I can > think of at this point. No idea - I just repaired the SD socket after the D2 line became disconnected, and decided to run that command as a test. > > ARM64 host, Macchiatobin, uSD card. > > What mmc host driver is it? mmci? sdhci-xenon. I'm just trying with one CPU online, then I'll try with two. My suspicion is that there's a problem in the ARM64 arch code where unlocking a mutex doesn't get noticed on other CPUs. Hmm, I thought I'd try bringing another CPU online, but it seems like the ARM64 CPU hotplug code is broken: [ 3552.029689] CPU1: shutdown [ 3552.031099] psci: CPU1 killed. [ 3949.835212] CPU1: failed to come online [ 3949.837753] CPU1: failed in unknown state : 0x0 which means I can only take CPUs down, I can't bring them back online without rebooting. -- RMK's Patch system: https://www.armlinux.org.uk/developer/patches/ FTTC broadband for 0.8mile line in suburbia: sync at 12.1Mbps down 622kbps up According to speedtest.net: 11.9Mbps down 500kbps up _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel