It looks like the recurring problem here is indeed just Xorg:
[ 604.230] (EE) Backtrace:
[ 604.230] (EE) 0: /usr/lib/xorg/Xorg (OsLookupColor+0x13c) [0x5576c3d8facc]
[ 604.231] (EE) 1: /lib/x86_64-linux-gnu/libpthread.so.0 (funlockfile+0x60)
[0x7f6767b6359f]
[ 604.231] (EE) 2: /lib/x86_64-linux-gnu/libc.so.6 (gsignal+0xcb)
[0x7f67679a13eb]
[ 604.232] (EE) 3: /lib/x86_64-linux-gnu/libc.so.6 (abort+0x12b)
[0x7f6767980899]
[ 604.232] (EE) unw_get_proc_name failed: no unwind info found [-10]
[ 604.232] (EE) 4: /lib/x86_64-linux-gnu/libc.so.6 (?+0x0) [0x7f676798075a]
[ 604.232] (EE) 5: /lib/x86_64-linux-gnu/libc.so.6 (__assert_fail+0x46)
[0x7f6767992006]
[ 604.232] (EE) 6: /usr/lib/xorg/Xorg (DRIMoveBuffersHelper+0xc15)
[0x5576c3d5aaa5]
[ 604.232] (EE) 7: /usr/lib/xorg/Xorg (DRI2Authenticate+0xa2) [0x5576c3d5c0f2]
[ 604.233] (EE) 8: /usr/lib/xorg/Xorg (DRI2GetParam+0x944) [0x5576c3d5d4b4]
[ 604.233] (EE) 9: /usr/lib/xorg/Xorg (SendErrorToClient+0x354)
[0x5576c3c2ef44]
[ 604.233] (EE) 10: /usr/lib/xorg/Xorg (InitFonts+0x3b4) [0x5576c3c32fd4]
[ 604.233] (EE) 11: /lib/x86_64-linux-gnu/libc.so.6 (__libc_start_main+0xf3)
[0x7f67679821e3]
[ 604.233] (EE) 12: /usr/lib/xorg/Xorg (_start+0x2e) [0x5576c3c1ca1e]
** Summary changed:
- Login loops with GNOME Boxes on Xorg
+ Xorg crashed with assertion failure in DRIMoveBuffersHelper
** Summary changed:
- Xorg crashed with assertion failure in DRIMoveBuffersHelper
+ [qxl] Xorg crashed with assertion failure in DRIMoveBuffersHelper
** Package changed: xorg (Ubuntu) => xserver-xorg-video-qxl (Ubuntu)
** Also affects: xorg-server (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1858336
Title:
[qxl] Xorg crashed with assertion failure in DRIMoveBuffersHelper
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