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Po. >>>>> "Po" == Po Lu writes: [...] Po> Oh, then I know this bug. It's in Cairo, not Emacs. Po> What version of Cairo do you have installed? I think this problem goes away if you update Po> Cairo to the latest released version. My distro is Archlinux, almost and up-to-date distro. I had installed 1.17.6. After your comment I upgrade cairo to the git version. And the error is still present. I should add that this error does NOT happen with emacs-master. So something has changed on emacs-master, that incidentally has avoided this error. Perhaps You could have an idea about what change has solved it on master. [...] Po> There is not, and there's no reason to not do that, if async input happens while deleting Po> the frame that causes the border color to legitimately change. Ok. But again. I am getting rid of all the frames that belong to this display. If the border change it is something I am not going to watch (because. It is going to be too quick for my eyes). IMO It could be an optimization there. Perhaps When 'dpyinfo->display == NULL' not updating the frame anymore. Anyway that is a kind of tangent for this bug. Po> That isn't the cause of this error. Right. It is asynchronous. Best Regards