Created attachment 1219698 [details]
engine log

Reminds me of bug 1364152 .

Hi Petr,
I've tried to reproduce but could not (also tried the scenario from the screenshot, VM in up state and attaching a disk as an OS disk)
Can you please follow those steps and send me the UI log?

yum install ovirt-engine-webadmin-portal-debuginfo
Restart the engine service
Reproduce the issue and attach logs from var/log/ovirt-engine/ui.log

Thanks.

Created attachment 1220472 [details]
ui log

It should be the same as in Additional info.
In this case I used an old VM and tried to attach new disk through edit VM dialogue and the same error appeared.

Tentatively targetting for 4.0.6 until we understand what's going on here.

Petr, can it be that the data center is down at the time of attachment?

Was experiencing similar problem with ovirt-engine 4.0.5.5 (logs below). The problem gone after upgrading to 4.0.6.3 pre-release.


2016-12-20 11:47:51,452 ERROR [org.ovirt.engine.ui.frontend.server.gwt.OvirtRemoteLoggingService] (default task-16) [] Permutation name: 36FFE9E683BD2C616FFB067DABA3A81E
2016-12-20 11:47:51,456 ERROR [org.ovirt.engine.ui.frontend.server.gwt.OvirtRemoteLoggingService] (default task-16) [] Uncaught exception: com.google.gwt.event.shared.UmbrellaException: Exception caught: Exception caught: (TypeError) 
 __gwt$exception: <skipped>: Cannot read property 'b' of null
	at java.lang.Throwable.fillInStackTrace(Throwable.java:114) [rt.jar:1.8.0_111]
	at java.lang.RuntimeException.RuntimeException(RuntimeException.java:32) [rt.jar:1.8.0_111]
	at com.google.web.bindery.event.shared.UmbrellaException.UmbrellaException(UmbrellaException.java:70) [gwt-servlet.jar:]
	at com.google.gwt.event.shared.UmbrellaException.UmbrellaException(UmbrellaException.java:25) [gwt-servlet.jar:]
	at com.google.gwt.event.shared.HandlerManager.$fireEvent(HandlerManager.java:117) [gwt-servlet.jar:]
	at com.google.gwt.user.client.ui.Widget.$fireEvent(Widget.java:127) [gwt-servlet.jar:]
	at com.google.gwt.user.client.ui.Widget.fireEvent(Widget.java:127) [gwt-servlet.jar:]
	at com.google.gwt.event.dom.client.DomEvent.fireNativeEvent(DomEvent.java:110) [gwt-servlet.jar:]
	at com.google.gwt.user.client.ui.Widget.$onBrowserEvent(Widget.java:163) [gwt-servlet.jar:]
	at com.google.gwt.user.client.ui.CustomButton.onBrowserEvent(CustomButton.java:631) [gwt-servlet.jar:]
	at com.google.gwt.user.client.DOM.dispatchEvent(DOM.java:1648) [gwt-servlet.jar:]
	at com.google.gwt.user.client.impl.DOMImplStandard.dispatchEvent(DOMImplStandard.java:320) [gwt-servlet.jar:]
	at com.google.gwt.core.client.impl.Impl.apply(Impl.java:296) [gwt-servlet.jar:]
	at com.google.gwt.core.client.impl.Impl.entry0(Impl.java:335) [gwt-servlet.jar:]
	at Unknown.eval(webadmin-0.js@54)
	at com.google.gwt.dom.client.DOMImplStandard.$dispatchEvent(DOMImplStandard.java:68) [gwt-servlet.jar:]
	at com.google.gwt.user.client.ui.CustomButton.$onClick(CustomButton.java:822) [gwt-servlet.jar:]
	at org.ovirt.engine.ui.common.widget.dialog.AbstractDialogButton.onClick(AbstractDialogButton.java:45)
	at com.google.gwt.user.client.ui.CustomButton.onBrowserEvent(CustomButton.java:631) [gwt-servlet.jar:]
	at com.google.gwt.user.client.DOM.dispatchEvent(DOM.java:1648) [gwt-servlet.jar:]
	at com.google.gwt.user.client.DOM.dispatchEvent(DOM.java:1666) [gwt-servlet.jar:]
	at com.google.gwt.user.client.impl.DOMImplStandard.dispatchCapturedMouseEvent(DOMImplStandard.java:352) [gwt-servlet.jar:]
	at com.google.gwt.core.client.impl.Impl.apply(Impl.java:296) [gwt-servlet.jar:]
	at com.google.gwt.core.client.impl.Impl.entry0(Impl.java:335) [gwt-servlet.jar:]
	at Unknown.eval(webadmin-0.js@54)
Caused by: com.google.gwt.event.shared.UmbrellaException: Exception caught: (TypeError) 
 __gwt$exception: <skipped>: Cannot read property 'b' of null
	at java.lang.Throwable.fillInStackTrace(Throwable.java:114) [rt.jar:1.8.0_111]
	at java.lang.RuntimeException.RuntimeException(RuntimeException.java:32) [rt.jar:1.8.0_111]
	at com.google.web.bindery.event.shared.UmbrellaException.UmbrellaException(UmbrellaException.java:70) [gwt-servlet.jar:]
	at com.google.gwt.event.shared.UmbrellaException.UmbrellaException(UmbrellaException.java:25) [gwt-servlet.jar:]
	at com.google.gwt.event.shared.HandlerManager.$fireEvent(HandlerManager.java:117) [gwt-servlet.jar:]
	at com.google.gwt.user.client.ui.Widget.$fireEvent(Widget.java:127) [gwt-servlet.jar:]
	at com.google.gwt.user.client.ui.Widget.fireEvent(Widget.java:127) [gwt-servlet.jar:]
	at com.google.gwt.event.logical.shared.ValueChangeEvent.fire(ValueChangeEvent.java:40) [gwt-servlet.jar:]
	at org.ovirt.engine.ui.common.widget.uicommon.instanceimages.InstanceImageLineEditor$3.eventRaised(InstanceImageLineEditor.java:96)
	at org.ovirt.engine.ui.uicompat.Event.$raise(Event.java:114)
	at org.ovirt.engine.ui.uicommonweb.models.EntityModel.$setEntity(EntityModel.java:35)
	at org.ovirt.engine.ui.uicommonweb.models.EntityModel.setEntity(EntityModel.java:35)
	at org.ovirt.engine.ui.uicommonweb.models.vms.InstanceImageLineModel$2.onSave(InstanceImageLineModel.java:178)
	at org.ovirt.engine.ui.uicommonweb.models.vms.AbstractDiskModel.executeCommand(AbstractDiskModel.java:1046)
	at org.ovirt.engine.ui.uicommonweb.UICommand.$execute(UICommand.java:163)
	at org.ovirt.engine.ui.common.presenter.AbstractModelBoundPopupPresenterWidget$6.onClick(AbstractModelBoundPopupPresenterWidget.java:337)
	at com.google.gwt.event.dom.client.ClickEvent.dispatch(ClickEvent.java:55) [gwt-servlet.jar:]
	at com.google.gwt.event.shared.GwtEvent.dispatch(GwtEvent.java:76) [gwt-servlet.jar:]
	at com.google.web.bindery.event.shared.SimpleEventBus.$doFire(SimpleEventBus.java:173) [gwt-servlet.jar:]
	... 21 more
Caused by: com.google.gwt.core.client.JavaScriptException: (TypeError) 
 __gwt$exception: <skipped>: Cannot read property 'b' of null
	at org.ovirt.engine.ui.common.widget.AddRemoveRowWidget$AddRemoveRowPanel.$setButtonsEnabled(AddRemoveRowWidget.java:377)
	at org.ovirt.engine.ui.common.widget.AddRemoveRowWidget.$setButtonsEnabled(AddRemoveRowWidget.java:344)
	at org.ovirt.engine.ui.common.widget.AddRemoveRowWidget.toggleGhost(AddRemoveRowWidget.java:497)
	at org.ovirt.engine.ui.common.widget.AddRemoveRowWidget$3.onValueChange(AddRemoveRowWidget.java:232)
	at com.google.gwt.event.logical.shared.ValueChangeEvent.dispatch(ValueChangeEvent.java:127) [gwt-servlet.jar:]
	at com.google.gwt.event.shared.GwtEvent.dispatch(GwtEvent.java:76) [gwt-servlet.jar:]
	at com.google.web.bindery.event.shared.SimpleEventBus.$doFire(SimpleEventBus.java:173) [gwt-servlet.jar:]
	... 36 more

Dmitry, did this happen when all data centers were down?

No, the single datacenter was up. It is fresh sandbox install. There is one datacenter, one cluster and one host.
One unusual thing is I was attaching RBD images with Cinder provider (didn't tried regular disk images).

OK, this issue is fixed in 4.0.6 so an upgrade will fix it.
As a work around you can create the VM first and then attach the disk from the disks sub tab.
Marking as MODIFIED so it will be tested on 4.0.7 to make sure although I've tried myself and could not reproduce.

4.0.6 has been the last oVirt 4.0 release, please re-target this bug.

Verified with the following code:
------------------------------------------------
rhevm-4.1.0.2-0.2.el7.noarch
ovirt-engine-4.1.0.2-0.2.el7.noarch
vdsm-4.19.2-2.el7ev.x86_64


Verified with the following scenario:
------------------------------------------
1. create new vm
2. select attach disk
3. select a disk and confirm the dialogue - disk is successfully attached


Moving to VERIFIED!