I just ran into the same bug (Ubuntu 16.04.4 LTS, fully updated at time
of the comment).
I've played with cmd arguments a little and it seems that the bug is
triggered at some length of the vnc socket path.
This is running okay:
$ qemu-system-x86_64 -enable-kvm -vnc unix:./service/vnc-sock
Also
** Changed in: qemu (Ubuntu)
Status: Expired => New
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https://bugs.launchpad.net/bugs/1705743
Title:
qemu-system-x86 crashes when VNC connection is established
To manage