Looks like it's crashing in nouveau_dri.so so that's Mesa. You might want to try the official nvidia driver(s) instead of nouveau.
** Package changed: xorg (Ubuntu) => mesa (Ubuntu) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1646937 Title: [xorg-edgers] "double free or corruption (fasttop): 0x0000559f5eb04db0 ***" in "/usr/lib/x86_64-linux- gnu/dri/nouveau_dri.so(+0x1cf9ab)[0x7f79adc159ab]" To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/mesa/+bug/1646937/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs