[mythtv] mythfrontend on ubuntu 17.04 testing X11 ICE problems
Stuart Auchterlonie
stuarta at squashedfrog.net
Mon Feb 6 11:42:17 UTC 2017
On 05/02/17 10:33, roger at beardandsandals.co.uk wrote:
>
> I appear to have lost outgoing SMTP mail. On the plus side. I think I may found the answer.
>
> ----- Original Message -----
> From: roger roger at beardandsandals.co.uk
> To: Mythtv Developers mythtv-dev at mythtv.org
> Sent: Sat 4/02/17 8:02 PM
> Subject: Fwd: Re: mythfrontend on ubuntu 17.04 testing X11 ICE problems
>
>
> On 04/02/17 16:27, roger wrote:
>>
>>
>> On 04/02/17 15:30, roger wrote:
>>> I have set up my little Shuttle XS35V3 box as an ubuntu 17.04
>>> testbed. I have built and and installed from the 2.8 fixes branch.
>>>
>>> I keep getting this from mythfrontend on stderr
>>>
>>> ICE default IO error handler doing an exit(), pid = 1752, errno = 32
>>> QWaitCondition: cv destroy failure: Device or resource busy
>>> QWaitCondition: mutex destroy failure: Device or resource busy
>>>
>>> The old trick of deleting the ..ICEauthority file seems to work if
>>> you do it right after mythfrontend exits, this may be a red herring.
>>> But unfortunately the error will reappear at some point, most likely
>>> on the next boot.
>>>
>>> This problem seems to have been around for ages.
>>>
>>> Does anyone know what Qt is doing with ICE?
>>>
>>> Errno 32 is broken pipe. So what is dying and why?
>>>
>>> Seeing as I have hijacked the families myth box for testing, I am
>>> keen to fix this :-).
>>>
>>> So all help will be gratefully received.
>>>
>>>
>>> Roger
>>>
>>
>> Sorry about the dual posting, the first one did not appear for until I
>> posted the second.
>>
>> The top and bottom of this is that something appears to be killing the
>> connection between mythfrontend and the X session manager. On the my
>> setup the session manager is xfce4_sm. I have set XFSM_VERBOSE and
>> have found something interesting.
>>
>> My backend is configured for idle shutdown and wake on lan. The
>> backend system runs the database server as well. If the backend system
>> is not running then then mythfrontend goes into it wake on lan
>> procedure. At some time in the distant past this started to prevent
>> the gui from appearing, although I am not entirely sure about this, it
>> might have always done it. This is what the session manager log shows
>> happening.
>>
>> TRACE[xfsm-manager.c:1295] xfsm_manager_save_yourself_done():
>> enteringTRACE[sm-layer.c:162] sm_new_client(): ICE connection fd = 20,
>> received NEW CLIENT
>>
>> TRACE[sm-layer.c:213] sm_register_client(): ICE connection fd = 20,
>> received REGISTER CLIENT [Previous Id = None]
>>
>> TRACE[xfsm-manager.c:1607] xfsm_manager_save_timeout(): Client id =
>> 2ac51c2aa-c28b-4b54-8412-69aec21ced14, received SAVE TIMEOUT
>> Client will be disconnected now.
>>
>> This happens whilst the frontend is still waiting for the database
>> connection to come up. When it does the frontend does a whole load of
>> gui image loads the thing you see in the log in loading
>> watermark/dvd.png at which point the ICE error occurs, presumably when
>> the main loop tries to send something to the session manager.
>>
>> Roger
>>
> Ok I can see what is happening now MSqlDatabase::OpenDatabase in
> mythdbcon.cpp has a sleep in the wake on lan loop. This is very
> unfriendly in a gui environment as the main message loop does not get
> actioned.
>
> Possible fixes.
>
> 1. Write a gui friendly version of OpenDatabase.
We definitely should do this.
>
> 2. Move the wol stuff up into mythfrontend (I wonder if this was already
> done in reverse in the past/).
>
> 3. Do it in a wrapper.
>
> 4. Do it in systemd.
>
Not everyone uses systemd.
> 5. ?
>
Profit $$$ of course ;-)
Regards
Stuart
> Roger
>
>
>
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