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Re: X widget question

On 20/03/2016 09:57, Marco Atzeri wrote:
I have finally identified where ncview was
segfaulting on X86_64

The solution was to reverse the order of destruction
for a chain of widgets

Nice to see that you have resolved this.

It's not clear from what you write if you are sure there is an undocumented ordering constraint (which just happens to not crash on 32-bit), or if reversing the ordering just happens to make things not crash on 64-bit

The segfault was inside Xlib when managing the constraints.

As the segfault did not happened on i686, is it possible
that is a race inside Xlib  ?
I have not found in the X Documentation nothing about
requested order of widget destruction in this case.

Possible, yes. It seems more likely that there is a documentation error, or a bug in handling widgets which share a constraint being destroyed out of order.

I'm afraid finding someone who cares greatly about libXt will be hard, but do you think it would now be possible to craft a test case which demonstrates the problem?

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