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charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Thu, May 25, 2023 at 10:33=E2=80=AFAM Po Lu wrote: > Did you build with checking? Yes. Here are the configure options I've been using to test it: ./configure --without-all --with-x-toolkit=3Dno --without-compress-install --without-tree-sitter --without-json --with-cairo --enable-checking=3D'yes,glyphs' --enable-check-lisp-object-type CFLAGS=3D'-O0 -g3' Let me know if there are relevant settings differences. > Because when I last tried, this assert > triggered with the second frame created. I'm not sure if you tested the last patch I sent as it is, or if you previously did assert tests on your own with the device returned by `cairo_xcb_surface_create' at `x_begin_cr_clip'. Assuming it's the latter, then please pay close attention at this change I made to the code: if (cairo_surface_status (surface) =3D=3D CAIRO_STATUS_SUCCESS) eassert (FRAME_DISPLAY_INFO (f)->cairo_device =3D=3D cairo_surface_get_device (surface)); Notice that, before I do the assert, I first check if the surface returned by `cairo_xcb_surface_create' is good. One thing that I observed when debugging is that, every time a new frame is created, this part of the code is hit 3 times. The first time, the surface it returns is always a bad one, which might even have some random garbage value for the device. The other 2 times, it's a proper xcb surface, and they always have the same device in common. Same thing with subsequent calls, it's always the same cairo-xcb device. Similar behavior when I make tooltips appear. I've attached a gdb session log showing it. > If we are going down this route, I think we should save each distinct > device returned by `cairo_surface_get_device', and delete each of them > upon the terminal being deleted. > As I explained, I saw that function return different devices for the > same XCB connection, which is definitely a problem with Cairo. Considering my observation above, it doesn't seem that different _valid_ devices are being created. But if that is really the case and I'm missing it, then yes, we make a dynamic list of devices instead. Consider also that, with the changes I proposed, a device reference is kept from the beginning, which might influence the results here. --0000000000007f086505fc852236 Content-Type: application/vnd.lotus-organizer; name="gdb-session--cairo-xcb-device.org" Content-Disposition: attachment; filename="gdb-session--cairo-xcb-device.org" Content-Transfer-Encoding: base64 Content-ID: X-Attachment-Id: f_li374kkw0 CiogZ2RiIHN0YXJ0CgojIGdkYiAtLWFyZ3MgLi9lbWFjcy0yOS4wLjkxLjEgLWQgOjEgLXhybSAi ZW1hY3Muc3luY2hyb25vdXM6IHRydWUiIC1RIC0tZmctZGFlbW9uPXRlc3QKR05VIGdkYiAoRGVi aWFuIDEwLjEtMS43KSAxMC4xLjkwLjIwMjEwMTAzLWdpdApDb3B5cmlnaHQgKEMpIDIwMjEgRnJl ZSBTb2Z0d2FyZSBGb3VuZGF0aW9uLCBJbmMuCkxpY2Vuc2UgR1BMdjMrOiBHTlUgR1BMIHZlcnNp b24gMyBvciBsYXRlciA8aHR0cDovL2dudS5vcmcvbGljZW5zZXMvZ3BsLmh0bWw+ClRoaXMgaXMg ZnJlZSBzb2Z0d2FyZTogeW91IGFyZSBmcmVlIHRvIGNoYW5nZSBhbmQgcmVkaXN0cmlidXRlIGl0 LgpUaGVyZSBpcyBOTyBXQVJSQU5UWSwgdG8gdGhlIGV4dGVudCBwZXJtaXR0ZWQgYnkgbGF3LgpU 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