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charset="utf-8" Content-Transfer-Encoding: quoted-printable Date: Sun, 26 Apr 2020 07:31:49 -0000 From: A van Schie <1875139@bugs.launchpad.net> To: qemu-devel@nongnu.org X-Launchpad-Notification-Type: bug X-Launchpad-Bug: product=qemu; status=New; importance=Undecided; assignee=None; X-Launchpad-Bug-Information-Type: Public X-Launchpad-Bug-Private: no X-Launchpad-Bug-Security-Vulnerability: no X-Launchpad-Bug-Commenters: avschie X-Launchpad-Bug-Reporter: A van Schie (avschie) X-Launchpad-Bug-Modifier: A van Schie (avschie) References: <158788589324.18152.6333525201430073299.malonedeb@wampee.canonical.com> Message-Id: <158788630985.23770.13615669995341228265.malone@chaenomeles.canonical.com> Subject: [Bug 1875139] Re: Domain fails to start when 'readonly' device not writable X-Launchpad-Message-Rationale: Subscriber (QEMU) @qemu-devel-ml X-Launchpad-Message-For: qemu-devel-ml Precedence: bulk X-Generated-By: Launchpad (canonical.com); Revision="486bbbd6cb608f8eb468ed0d08689a349dfabe49"; Instance="production-secrets-lazr.conf" X-Launchpad-Hash: 85fcb4d05e27ecbd5bf40105ed228839de34b755 Received-SPF: none client-ip=91.189.90.7; envelope-from=bounces@canonical.com; helo=indium.canonical.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/04/26 03:30:53 X-ACL-Warn: Detected OS = Linux 3.11 and newer X-Received-From: 91.189.90.7 X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: Bug 1875139 <1875139@bugs.launchpad.net> Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" Traceback (most recent call last): File "/usr/share/virt-manager/virtManager/asyncjob.py", line 75, in cb_wr= apper callback(asyncjob, *args, **kwargs) File "/usr/share/virt-manager/virtManager/asyncjob.py", line 111, in tmpcb callback(*args, **kwargs) File "/usr/share/virt-manager/virtManager/object/libvirtobject.py", line = 66, in newfn ret =3D fn(self, *args, **kwargs) File "/usr/share/virt-manager/virtManager/object/domain.py", line 1279, i= n startup self._backend.create() File "/usr/lib/python3.7/site-packages/libvirt.py", line 1152, in create if ret =3D=3D -1: raise libvirtError ('virDomainCreate() failed', dom= =3Dself) libvirt.libvirtError: internal error: process exited while connecting to mo= nitor: 2020-04-26T07:29:47.463835Z qemu-system-x86_64: -blockdev {"driver":= "host_device","filename":"/var/lib/libvirt/vmportage/rootdisk","aio":"nativ= e","node-name":"libvirt-3-storage","cache":{"direct":true,"no-flush":false}= ,"auto-read-only":true,"discard":"unmap"}: The device is not writable: Perm= ission denied -- = You received this bug notification because you are a member of qemu- devel-ml, which is subscribed to QEMU. https://bugs.launchpad.net/bugs/1875139 Title: Domain fails to start when 'readonly' device not writable Status in QEMU: New Bug description: This issue is introduced in QEMU 4.2.0 (4.1.0 is working fine) My root disk is a LVM2 volume thin snapshot that is marked as read-only But when I try to start the domain (using virt-manager) I get the followi= ng error: Error starting domain: internal error: process exited while connecting to monitor: 2020-04-26T06:55:06.342700Z qemu-system-x86_64: -blockdev {"driver":"host_device","filename":"/dev/vg/vmroot-20200425","aio":"native ","node-name":"libvirt-3-storage","cache":{"direct":true,"no- flush":false},"auto-read-only":true,"discard":"unmap"} The device is not writable: Permission denied Changing the lvm snapshot to writeable allows me to start the domain. (Making it changes possible during domain is running) I don't think QEMU should fail when it can't open a (block) device when t= he read-only option is set. (why is write access needed?) Reproduce steps: * Create LVM read-only volume (I don't think any data is needed) * Create domain with read-only volume as block device * Try to start the domain To manage notifications about this bug go to: https://bugs.launchpad.net/qemu/+bug/1875139/+subscriptions