[Development] swapEGLBuffers() : 135 : QQNX: failed to swap EGL buffers, err=12301 on QNX with Qt-5.3.2

[James McDonnell]

On 2017-06-13, 12:49 PM, "Prashant Purohit" <prashantpurohit025 at gmail.com>
wrote:

>Hi James,
>
>Thanks for a quick reply.
>
>> You might be able to get around the problem if you can give the
>> application a chance to draw between resize operations.
>
>I am not sure how can I draw between resize operation.

I'm not sure off-hand either.  Another possibility is avoiding such
resizing.

>Also, since this issue is hardly reproducible, how will I verify the
>fix which I will do.

You'd have to create a situation where it's more likely to occur.  I
figured out what it was with a test application that flipped back and
forth between two sizes in response to a menu item.

>
>Do you know anyway with which I can reproduce this issue every-time?

Assuming that this is actually the problem, every time would require
freezing the rendering thread, resizing away from the current size,
resizing back and unfreezing the rendering thread.  Might be possible with
pthread_suspend/resume.

>Also when will be the QNX-QT fix will be available so that an update
>in QNX at my side will help me fix this issue?

I don't know when (if ever) we'll update the QNX-Qt 5.3.1. :-(

>
>Thanks,
>Prashant
>
>On 6/13/17, James McDonnell <jmcdonnell at blackberry.com> wrote:
>> Hi Prashant,
>>
>> Is your application performing a rapid sequence of resizing operations
>>on
>> the EGL window that leaves the size of the window unchanged?  We
>>recently
>> discovered that this can cause the QNX Qt platform code to produce this
>> problem.  I haven't had a chance to upstream the fix for it yet.  We
>>also
>> haven't updated the Qt that QNX produces (which I think is what you're
>> using).
>>
>> You might be able to get around the problem if you can give the
>> application a chance to draw between resize operations.
>>
>> James
>>
>> On 2017-06-13, 12:50 AM, "Development on behalf of Prashant Purohit"
>> <development-bounces+jmcdonnell=blackberry.com at qt-project.org on behalf
>>of
>> prashantpurohit025 at gmail.com> wrote:
>>
>>>Hi All,
>>>
>>>I am using QNX with Qt-5.3.2 and found below issue and crash:
>>>
>>>FAULT - qqnxeglwindow.cpp : void QQnxEglWindow::swapEGLBuffers() : 135
>>>: QQNX: failed to swap EGL buffers, err=12301
>>>
>>>When I checked on internet for this issue, it was referenced that when
>>>Qnx window does not find EGL surface to paint this issue occurs but I
>>>have an EGL display surface only and not sure why this error occurs.
>>>
>>>This issue has occurred only twice on release build and I could not
>>>get the back-trace.
>>>
>>>This seems to be QNX issue as an application software with QT, we do
>>>not directly deal with swapEGLBuffers.
>>>
>>>Please let me know if anyone has faced similar issue or know how to
>>>fix this issue.
>>>
>>>Thanks,
>>>Prashant
>>>_______________________________________________
>>>Development mailing list
>>>Development at qt-project.org
>>>http://lists.qt-project.org/mailman/listinfo/development
>>
>>