mistranslation: 0.788 graphic: 0.593 device: 0.491 semantic: 0.447 user-level: 0.377 network: 0.290 socket: 0.230 files: 0.230 performance: 0.230 VMM: 0.228 register: 0.221 virtual: 0.205 PID: 0.189 permissions: 0.184 i386: 0.174 debug: 0.164 architecture: 0.161 risc-v: 0.154 vnc: 0.153 arm: 0.150 ppc: 0.148 boot: 0.111 peripherals: 0.103 x86: 0.087 kernel: 0.078 TCG: 0.066 KVM: 0.023 hypervisor: 0.021 assembly: 0.013 It dumps when following this tutorial on hello world os http://mikeos.berlios.de/write-your-own-os.html Following the steps, it works on ubuntu, but on osx, it ALWAYS dumps. The referenced website is no longer available, thus setting this ticket to INVALID. Please feel free to re-open it if the information is available somewhere else and you can reproduce it with the latest version of QEMU.