From owner-freebsd-fs@freebsd.org Mon Oct 2 19:36:24 2017 Return-Path: Delivered-To: freebsd-fs@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id CD855E25D96 for ; Mon, 2 Oct 2017 19:36:24 +0000 (UTC) (envelope-from grarpamp@gmail.com) Received: from mail-vk0-x22f.google.com (mail-vk0-x22f.google.com [IPv6:2607:f8b0:400c:c05::22f]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (Client CN "smtp.gmail.com", Issuer "Google Internet Authority G2" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 88CA874FDB for ; Mon, 2 Oct 2017 19:36:24 +0000 (UTC) (envelope-from grarpamp@gmail.com) Received: by mail-vk0-x22f.google.com with SMTP id k191so1481752vke.7 for ; Mon, 02 Oct 2017 12:36:24 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:from:date:message-id:subject:to; bh=Wf6u6QnyUs7jwONWAx1HGwDu1xFyCmMFl7GPrlBfMoM=; b=pp6tkicUukxkZnm6lBiji0rM6/dxLqjjJ3w+4MRoViYCVMZLbD2dc1rZn1IOX5M51u aKZ/+hRslZZu/J+OqSH0wr3qz1uE24j8CRa11rmB3CVzRlZe5Nl+bdDUBSbRptrTeqkG HYsFdB5H7tboOuem/lUg+g72AIZIyPftuFEG3hCcwomsTN68InHs/hcPpSSzyQv/ddfb ohxSFMbogt9a9RHJuSn4624RLZEKFbQn/06qEGCQZKvemOvRfmMqC6ge4YgQ4Wl4Hza+ 5voC68SarT95V0ewVL4UweilbyFWkSAjXLt9YOuNMnjRSSa9NgKqxWjvwW2+GiO4OPu+ 0LmQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:from:date:message-id:subject:to; bh=Wf6u6QnyUs7jwONWAx1HGwDu1xFyCmMFl7GPrlBfMoM=; b=t6EawYk3IAhAJI49rX1TiHMeJbQtkoNnQYJld2T8/0MaYzxcfqhQB1DfPXBqgw1eNB 7GqAFvAiaDBfczrcPkU6zrJtBEYgD6kt8iB6L3iaSkMi0ETrdZ8fA4Nz6HxeHMYZJmPl zUkkwARBEWkI1S2/90Z5ijzvZQ6d8rMC/aLRRlz9VAOXhw1zBMt3zg/PHlqP+p0BWpBN JC4RGqXjlxkOu/qyJ+9++3WcE+vRpk1vrwII1Qw/tsEPMeqc6VEK+EEv7etZuo+hERfl lCAz1cpLzizIjiG0A8/RIn2paY6gjRvKdgIF7hNMIboZ0ryNIc6mOeSftz20ZyPo+n8n oYyw== X-Gm-Message-State: AHPjjUiZAWHMyW58t/m32Lx9L0AjjG6bJgqCydKuz5kEzQPlFohTA1ko JQoTlTDQ9khZnVWTH5ovmg8B36/snpbckXcijirLKQ== X-Google-Smtp-Source: AOwi7QCDQIwqHlbQ3J+0S1Dhb9xoOtwOXi5TomvwwD8HUBYDFpZsfIR2Sy1tynQx0hMymxdLhAkmAIMjNoEPsBLWRAM= X-Received: by 10.31.160.14 with SMTP id j14mr9146973vke.172.1506972982964; Mon, 02 Oct 2017 12:36:22 -0700 (PDT) MIME-Version: 1.0 Received: by 10.159.50.129 with HTTP; Mon, 2 Oct 2017 12:35:42 -0700 (PDT) From: grarpamp Date: Mon, 2 Oct 2017 15:35:42 -0400 Message-ID: Subject: dd: vm_fault: pager read error To: freebsd-fs@freebsd.org Content-Type: text/plain; charset="UTF-8" X-BeenThere: freebsd-fs@freebsd.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Filesystems List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 02 Oct 2017 19:36:24 -0000 11.0 release amd64 r306420 kern.geom.debugflags=0 (unmodified) dd if=/dev/zero of=/dev/ada0s1 seek=2048 count=1 bs=1m 1+0 records in 1+0 records out 1048576 bytes transferred reboot: Device not configured, and for any other uncached access to the filesystem in ada0s1a, note / is on s1a, dd is past that. vnode_pager_generic_getpages_done: I/O read error 5 vm_fault: pager read error, pid 1 (init) HW reset and all layout, filesystems, and data are fine. Repeatable. Also, echo '' | dd of=/dev/ada0s1 seek=2048 count=1 bs=1m conv=sync does get written and is readable upon reboot, dd if=/dev/ada0s1 skip=2048 count=1 bs=1m ' wherein that read does not trigger the fault. All the offsets and sizes add up sequentially, no overlap, the relavant portions are below, disk is <~= 250G, gpart, fdisk, boot0cfg, bsdlabel all concur without error. What am I overlooking, or is this kernel behaviour a bug? => 63 x ada0 MBR (XG) 63 1 - free - (512B) 64 8388608 ada0s1 freebsd [active] (4.0G) 8388672 109051904 ada0s2 freebsd (52G) => 0 8388608 ada0s1 BSD (4.0G) 0 4194304 ada0s1a freebsd-ufs (2.0G) / 4194304 4194304 - free - (2.0G)