Setting pci=nomsi seems to do the trick for now. Probably not optimal but it's just a VM and I didn't notice any performance issues.

@rzr Hi. It appeared only once, after a host reboot. If it shows again, I'll let you know.

I get this in dmesg after the latest updates :

[   54.673443] python3[3691]: segfault at 200000 ip 00007f16eb8eca9f sp 00007ffd                                                                                                             b84e9ff0 error 4 in libpython3.6m.so.1.0[7f16eb804000+28d000]
[   54.673450] Code: 01 00 00 8d 5f ff 48 8d 2d de 3a 3c 00 c1 eb 03 44 8d 24 1b                                                                                                              4e 8b 44 e5 00 49 8b 70 10 49 39 f0 74 5f 49 8b 40 08 41 83 00 01 <48> 8b 38 48                                                                                                              85 ff 49 89 78 08 74 0d 48 83 c4 10 5b 5d 41 5c c3 0f
[   84.587661] xapi[3697]: segfault at 7f28cacaea40 ip 00007f28c6df0ec2 sp 00007                                                                                                             f289a5b8af0 error 6 in libjemalloc.so.2[7f28c6d85000+85000]
[   84.587669] Code: 48 2b 73 08 44 8b 4d 84 ba 01 00 00 00 49 83 c2 01 49 0f af                                                                                                              f1 4c 8d 0d ac 72 42 00 48 89 f1 48 c1 ee 26 48 c1 e9 20 48 d3 e2 <48> 31 54 f3                                                                                                              40 48 8b 8d 58 ff ff ff 48 8b 33 48 8d be 00 00 00 10

@dthenot

They appear now. I will try to identify them manually. Thanks for the tip.