The problem doesn't occur if I set any specific CPU other than "max".
> :/ # /usr/bin/qemu-aarch64 -cpu cortex-a76 -d unimp /usr/bin/zypper --version
> Unsupported syscall: 293
> zypper 1.14.58
> :/ # /usr/bin/qemu-aarch64 -cpu max -d unimp /usr/bin/zypper --version
> Unsupported syscall: 293
> zypper 1.14.58
> Segmentation fault (core dumped)