virtual: 0.897
graphic: 0.883
user-level: 0.812
debug: 0.703
device: 0.703
performance: 0.664
mistranslation: 0.625
vnc: 0.623
semantic: 0.612
architecture: 0.545
PID: 0.527
network: 0.460
x86: 0.445
peripherals: 0.444
register: 0.442
permissions: 0.442
ppc: 0.437
boot: 0.408
hypervisor: 0.382
socket: 0.361
kernel: 0.360
VMM: 0.356
files: 0.352
risc-v: 0.300
TCG: 0.285
i386: 0.285
assembly: 0.280
KVM: 0.271
arm: 0.238

No provider of glEGLImageTargetTexture2DOES found with NVIDIA proprietary driver

https://github.com/anholt/libepoxy/issues/148

I'm hitting this issue on Fedora 30 after an in-place upgrade.  Using gnome-boxes, I click on a virtual machine to open the console viewer and it crashes after a hang.  Terminal output looks like this:

[chris@gereon ~]$ gnome-boxes 

(gnome-boxes:15640): Gtk-WARNING **: 17:21:17.105: GtkFlowBox with a model will ignore sort and filter functions

(gnome-boxes:15640): Gtk-WARNING **: 17:21:17.107: GtkListBox with a model will ignore sort and filter functions
Memory pressure relief: Total: res = 11759616/11722752/-36864, res+swap = 7540736/7540736/0
No provider of glEGLImageTargetTexture2DOES found.  Requires one of:
    GL extension "GL_OES_EGL_image"
Aborted (core dumped)

nvidia driver version: 418.56

01:00.0 VGA compatible controller: NVIDIA Corporation GM206 [GeForce GTX 960] (rev a1)

Web searches lead me to the closed libepoxy bug posted by the OP.  I'm happy to provide more details about my system.

The QEMU project is currently considering to move its bug tracking to
another system. For this we need to know which bugs are still valid
and which could be closed already. Thus we are setting older bugs to
"Incomplete" now.

If you still think this bug report here is valid, then please switch
the state back to "New" within the next 60 days, otherwise this report
will be marked as "Expired". Or please mark it as "Fix Released" if
the problem has been solved with a newer version of QEMU already.

Thank you and sorry for the inconvenience.

[Expired for QEMU because there has been no activity for 60 days.]