From owner-freebsd-bugs@freebsd.org Sun Jan 28 14:21:01 2018 Return-Path: Delivered-To: freebsd-bugs@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 950BFEC8C53 for ; Sun, 28 Jan 2018 14:21:01 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from mxrelay.ysv.freebsd.org (mxrelay.ysv.freebsd.org [IPv6:2001:1900:2254:206a::19:3]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client CN "mxrelay.ysv.freebsd.org", Issuer "Let's Encrypt Authority X3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 3279E7EA85 for ; Sun, 28 Jan 2018 14:21:01 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from kenobi.freebsd.org (kenobi.freebsd.org [IPv6:2001:1900:2254:206a::16:76]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mxrelay.ysv.freebsd.org (Postfix) with ESMTPS id 6612C24275 for ; Sun, 28 Jan 2018 14:21:00 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from kenobi.freebsd.org ([127.0.1.118]) by kenobi.freebsd.org (8.15.2/8.15.2) with ESMTP id w0SEL0Ql000485 for ; Sun, 28 Jan 2018 14:21:00 GMT (envelope-from bugzilla-noreply@freebsd.org) Received: (from www@localhost) by kenobi.freebsd.org (8.15.2/8.15.2/Submit) id w0SEL0BJ000481 for freebsd-bugs@FreeBSD.org; Sun, 28 Jan 2018 14:21:00 GMT (envelope-from bugzilla-noreply@freebsd.org) X-Authentication-Warning: kenobi.freebsd.org: www set sender to bugzilla-noreply@freebsd.org using -f From: bugzilla-noreply@freebsd.org To: freebsd-bugs@FreeBSD.org Subject: [Bug 225506] Reading from virtio-blk device hangs Date: Sun, 28 Jan 2018 14:21:00 +0000 X-Bugzilla-Reason: AssignedTo X-Bugzilla-Type: new X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: Base System X-Bugzilla-Component: kern X-Bugzilla-Version: 11.1-RELEASE X-Bugzilla-Keywords: X-Bugzilla-Severity: Affects Only Me X-Bugzilla-Who: kozlov.sergey.404@gmail.com X-Bugzilla-Status: New X-Bugzilla-Resolution: X-Bugzilla-Priority: --- X-Bugzilla-Assigned-To: freebsd-bugs@FreeBSD.org X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: bug_id short_desc product version rep_platform op_sys bug_status bug_severity priority component assigned_to reporter Message-ID: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Bugzilla-URL: https://bugs.freebsd.org/bugzilla/ Auto-Submitted: auto-generated MIME-Version: 1.0 X-BeenThere: freebsd-bugs@freebsd.org X-Mailman-Version: 2.1.25 Precedence: list List-Id: Bug reports List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 28 Jan 2018 14:21:01 -0000 https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D225506 Bug ID: 225506 Summary: Reading from virtio-blk device hangs Product: Base System Version: 11.1-RELEASE Hardware: Any OS: Any Status: New Severity: Affects Only Me Priority: --- Component: kern Assignee: freebsd-bugs@FreeBSD.org Reporter: kozlov.sergey.404@gmail.com I'm using FreeBSD on KVM virtual machine from a hosting provider. On both 11.1-RELEASE and 12.0-CURRENT (2018-01-18) reading /dev/vtbd0 device hangs.=20 Using CentOS 6.9 I'm able to read full /dev/vda device without a hang. - Command # dd if=3D/dev/vtbd0 of=3D/dev/null bs=3D1M will eventually hang. - top shows dd in physrd state. - gstat shows L(q) equal to 1 or 2 (depending on a try), all the IOPS and throughput indications are zero for /dev/vtbd0 - dd can't be terminated with SIGKILL - the only way to terminate the dd process is # devctl disable vtbd0 Server configuration: RAM: 512MB CPU: 1x Intel Xeon E5-2620 v3 @ 2.40 GHz Disk: 250GB virtio-blk The info from the hosting provider: We are running the latest QEMU version and the latest 3.1 branch kernel, wh= ich was released for fixing the Spectre and Meltdown vulnerabilities. I'm still paying for the server, but I want to leave it in this state for n= ow to help investigate the issue. --=20 You are receiving this mail because: You are the assignee for the bug.=