[ovirt-devel] [ OST Failure Report ] [ oVirt 4.2 ] [ 2018-04-04 ] [006_migrations.prepare_migration_attachments_ipv6]

[Alona Kaplan]

Hi all,

Looking at the log it seems that the new GetCapabilitiesAsync is
responsible for the mess.

-
* 08:29:47 - engine loses connectivity to host 'lago-basic-suite-4-2-host-0'.*



*- Every 3 seconds a getCapabalititiesAsync request is sent to the
host (unsuccessfully).*

     * before each "getCapabilitiesAsync" the monitoring lock is taken
(VdsManager,refreshImpl)

     * "getCapabilitiesAsync" immediately fails and throws
'VDSNetworkException: java.net.ConnectException: Connection refused'.
The exception is caught by
'GetCapabilitiesAsyncVDSCommand.executeVdsBrokerCommand' which calls
'onFailure' of the callback and re-throws the exception.

         catch (Throwable t) {
            getParameters().getCallback().onFailure(t);
            throw t;
         }

    * The 'onFailure' of the callback releases the "monitoringLock"
('postProcessRefresh()->afterRefreshTreatment()-> if (!succeeded)
lockManager.releaseLock(monitoringLock);')

    * 'VdsManager,refreshImpl' catches the network exception, marks
'releaseLock = true' and *tries to release the already released lock*.

      The following warning is printed to the log -

      WARN  [org.ovirt.engine.core.bll.lock.InMemoryLockManager]
(EE-ManagedThreadFactory-engineScheduled-Thread-53) [] Trying to
release exclusive lock which does not exist, lock key:
'ecf53d69-eb68-4b11-8df2-c4aa4e19bd93VDS_INIT'




*- 08:30:51 a successful getCapabilitiesAsync is sent.*


*- 08:32:55 - The failing test starts (Setup Networks for setting ipv6).    *

    * SetupNetworks takes the monitoring lock.

*- 08:33:00 - ResponseTracker cleans the getCapabilitiesAsync requests
from 4 minutes ago from its queue and prints a VDSNetworkException:
Vds timeout occured.*

      * When the first request is removed from the queue
('ResponseTracker.remove()'), the
*'Callback.onFailure' is invoked (for the second time) -> monitoring
lock is released (the lock taken by the SetupNetworks!).*

      * *The other requests removed from the queue also try to release
the monitoring lock*, but there is nothing to release.

      * The following warning log is printed -
        WARN  [org.ovirt.engine.core.bll.lock.InMemoryLockManager]
(EE-ManagedThreadFactory-engineScheduled-Thread-14) [] Trying to
release exclusive lock which does not exist, lock key:
'ecf53d69-eb68-4b11-8df2-c4aa4e19bd93VDS_INIT'

- *08:33:00 - SetupNetwork fails on Timeout ~4 seconds after is
started*. Why? I'm not 100% sure but I guess the late processing of
the 'getCapabilitiesAsync' that causes losing of the monitoring lock
and the late + mupltiple processing of failure is root cause.


Ravi, 'getCapabilitiesAsync' failure is treated twice and the lock is
trying to be released three times. Please share your opinion regarding
how it should be fixed.


Thanks,

Alona.






On Sun, Apr 8, 2018 at 1:21 PM, Dan Kenigsberg <danken at redhat.com> wrote:

> On Sun, Apr 8, 2018 at 9:21 AM, Edward Haas <ehaas at redhat.com> wrote:
>
>>
>>
>> On Sun, Apr 8, 2018 at 9:15 AM, Eyal Edri <eedri at redhat.com> wrote:
>>
>>> Was already done by Yaniv - https://gerrit.ovirt.org/#/c/89851.
>>> Is it still failing?
>>>
>>> On Sun, Apr 8, 2018 at 8:59 AM, Barak Korren <bkorren at redhat.com> wrote:
>>>
>>>> On 7 April 2018 at 00:30, Dan Kenigsberg <danken at redhat.com> wrote:
>>>> > No, I am afraid that we have not managed to understand why setting and
>>>> > ipv6 address too the host off the grid. We shall continue researching
>>>> > this next week.
>>>> >
>>>> > Edy, https://gerrit.ovirt.org/#/c/88637/ is already 4 weeks old, but
>>>> > could it possibly be related (I really doubt that)?
>>>> >
>>>>
>>>
>> Sorry, but I do not see how this problem is related to VDSM.
>> There is nothing that indicates that there is a VDSM problem.
>>
>> Has the RPC connection between Engine and VDSM failed?
>>
>>
> Further up the thread, Piotr noticed that (at least on one failure of this
> test) that the Vdsm host lost connectivity to its storage, and Vdsm process
> was restarted. However, this does not seems to happen in all cases where
> this test fails.
>
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