This is a "Ubuntu Bionic" thing.
I've tried again on a VM with up-to-date Ubuntu Bionic and get the same segfault.
For comparison I've placed the Debian build of qemu-user-static version 4.2 to my Arch Linux VM and have no crash there.
So either the kernel version or some kernel configuration. Now I'm trying to get a coredump on my VM.
This is a "Ubuntu Bionic" thing.
I've tried again on a VM with up-to-date Ubuntu Bionic and get the same segfault.
For comparison I've placed the Debian build of qemu-user-static version 4.2 to my Arch Linux VM and have no crash there.
So either the kernel version or some kernel configuration. Now I'm trying to get a coredump on my VM.