Xfwm4 aborted because of assertion fails in intel_miptree_match_image():
xfwm4: ../mesa-19.1.1/src/mesa/drivers/dri/i965/intel_mipmap_tree.c:1293: intel_miptree_match_image: Assertion `image->TexObject->Target == mt->target' failed.
It caused by revert the default vblank method (auto) to GLX:
Author: Olivier Fourdan <firstname.lastname@example.org>
Date: Fri Apr 26 20:47:11 2019 +0200
compositor: Revert to GLX as default vblank method (again)
Although XPresent would be the most sensible choice for a lightweight
vblank method, it's still quite fragile and currently broken with
modesettings driver on Xorg 1.20.
GLX seems to work reasonably well on a wide range of hardware and driver
(including closed source drivers) and does not suffer from the lock ups
XPresent may cause on some kernel/driver.
Revert the default vblank method (auto) to GLX for now.
Signed-off-by: Olivier Fourdan <email@example.com>
There is a similar RHEL defect. But it is reported before this commit merged.
This is a bug in mesa, in the intel driver, that shows when Mesa is built with asserts() enabled (typically debug).
*** This bug has been marked as a duplicate of bug 15684 ***
See also bug 14475