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Subject: Re: Fwd: failure notice
To: Tom Kacvinsky <tom DOT kacvinsky AT vectorcast DOT com>
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From: Jon Turney <jon DOT turney AT dronecode DOT org DOT uk>
Message-ID: <56670A0B.5080707@dronecode.org.uk>
Date: Tue, 8 Dec 2015 16:49:15 +0000
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On 07/12/2015 16:17, Tom Kacvinsky wrote:
> On Mon, Dec 7, 2015 at 10:24 AM, Tom Kacvinsky wrote:
>> On Mon, Dec 7, 2015 at 10:19 AM, Jon Turney wrote:
>>> On 04/12/2015 14:20, Tom Kacvinsky wrote:
>>>> We have an interesting problem whereby an Linux X client application
>>>> crashes when running the X server on cygwin.  We have a reproducer
>>>> for the problem, but it is a Qt example application stored in a tarball.
>>>>
>>>> We have gathered the other information that would typically be requested.
>>>> I just need to know the best way of getting this information to the list.
>>>
>>>
>>> If the tarball is being rejected by the mailing list, I'd suggest you upload
>>> it to some file hosting site and send a link to the mailing list.
>>>
>>> If that is really not possible for you (why?), you may, on this specific
>>> occasion only, mail it directly to me.
>>
>> Hi Jon,
>>
>> That is totally do-able.  I will get it on a hosting site and send the link.
>
> Here is the DropBox link.
>
> https://www.dropbox.com/s/b6exaxm30j8q318/cygwin-x-repro.zip?dl=0

Sorry, I hadn't noticed that you are describing a crash in the Qt 
client, not the Cygwin X server.

So, firstly, this is a Qt issue.

It may well be that the multiwindow mode window manager for the Cygwin X 
server doesn't satisfy some expectation that Qt has (and I would be 
interested to know what that is), but Qt crashing is never the right
thing to do.

A backtrace of the Qt client when it crashes might be informative.

> Please note it is a Qt reproducer.  We have some hard coded paths in
> the Makefile that you will need to modify.  We are using Qt 4.8.6
> built on Ubuntu 12.04, 32 bit.
>
> Steps to reproduce:
>
> Build menus project
> Execute menus excutable
> Click on Edit to expand its menu
> Move the cursor down the menu and expand Format
> Move the cursor down the expanded menu and exit at the Center item
> move cursor to hover over File node.
> Menus app terminates

Nevertheless, I tried your reproducer in a Ubuntu 12.04 32-bit VM, but 
wasn't able to observe any crash.

I note that an Ubuntu 12.04 only seems to have Qt 4.8.1.  Are you using 
a self-built Qt?

-- 
Jon TURNEY
Volunteer Cygwin/X X Server maintainer

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