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[2a01:e0c:1:1599::12]) by mx.google.com with ESMTPS id p22si7627652wma.129.2019.02.11.09.28.33 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 11 Feb 2019 09:28:33 -0800 (PST) Received-SPF: pass (google.com: best guess record for domain of marc.w.gonzalez@free.fr designates 2a01:e0c:1:1599::12 as permitted sender) client-ip=2a01:e0c:1:1599::12; Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of marc.w.gonzalez@free.fr designates 2a01:e0c:1:1599::12 as permitted sender) smtp.mailfrom=marc.w.gonzalez@free.fr Received: from [192.168.108.68] (unknown [213.36.7.13]) (Authenticated sender: marc.w.gonzalez) by smtp3-g21.free.fr (Postfix) with ESMTPSA id D39E613F81D; Mon, 11 Feb 2019 18:27:41 +0100 (CET) Subject: Re: dd hangs when reading large partitions From: Marc Gonzalez To: Bart Van Assche , linux-mm , linux-block Cc: Jianchao Wang , Christoph Hellwig , Jens Axboe , fsdevel , SCSI , Jeffrey Hugo , Evan Green , Matthias Kaehlcke , Douglas Anderson , Stephen Boyd , Tomas Winkler , Adrian Hunter , Bart Van Assche , Martin Petersen , Bjorn Andersson , Ming Lei , Omar Sandoval , Roman Gushchin , Andrew Morton , Michal Hocko , James Bottomley References: <398a6e83-d482-6e72-5806-6d5bbe8bfdd9@oracle.com> <20190119095601.GA7440@infradead.org> <07b2df5d-e1fe-9523-7c11-f3058a966f8a@free.fr> <985b340c-623f-6df2-66bd-d9f4003189ea@free.fr> <5132e41b-cb1a-5b81-4a72-37d0f9ea4bb9@oracle.com> <7bd8b010-bf0c-ad64-f927-2d2187a18d0b@free.fr> <0cfe1ed2-41e1-66a4-8d98-ebc0d9645d21@free.fr> <27165898-88c3-ab42-c6c9-dd52bf0a41c8@free.fr> <66419195-594c-aa83-c19d-f091ad3b296d@free.fr> <1549640986.34241.78.camel@acm.org> <690af800-1cd2-3e68-94d9-bc4825790837@free.fr> Message-ID: <493e04e4-849d-8f25-95e3-408f775fab64@free.fr> Date: Mon, 11 Feb 2019 18:27:41 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.4.0 MIME-Version: 1.0 In-Reply-To: <690af800-1cd2-3e68-94d9-bc4825790837@free.fr> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit 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: On 11/02/2019 17:36, Marc Gonzalez wrote: > On 08/02/2019 16:49, Bart Van Assche wrote: > >> Does this problem only occur with block devices backed by the UFS driver >> or does this problem also occur with other block drivers? > > Yes, same issue with a USB3 mass storage device: > > usb 2-1: new SuperSpeed Gen 1 USB device number 2 using xhci-hcd > usb 2-1: New USB device found, idVendor=05dc, idProduct=a838, bcdDevice=11.00 > usb 2-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3 > usb 2-1: Product: USB Flash Drive > usb 2-1: Manufacturer: Lexar > usb 2-1: SerialNumber: AAYW2W7I13BAR0JC > usb-storage 2-1:1.0: USB Mass Storage device detected > scsi host0: usb-storage 2-1:1.0 > scsi 0:0:0:0: Direct-Access Lexar USB Flash Drive 1100 PQ: 0 ANSI: 6 > sd 0:0:0:0: [sda] 62517248 512-byte logical blocks: (32.0 GB/29.8 GiB) > sd 0:0:0:0: [sda] Write Protect is off > sd 0:0:0:0: [sda] Mode Sense: 43 00 00 00 > sd 0:0:0:0: [sda] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA > sda: sda1 > sd 0:0:0:0: [sda] Attached SCSI removable disk > > # dd if=/dev/sda of=/dev/null bs=1M status=progress > 3879731200 bytes (3.9 GB, 3.6 GiB) copied, 56.0097 s, 69.3 MB/s > > So the problem could be in SCSI glue, or block, or mm? Unlikely. Someone else would have been affected... A colleague pointed out that some memory areas are reserved downstream. Perhaps the FW goes haywire once the kernel touches reserved memory? I'm off to test that hypothesis. Regards.