I had two qemu crashes with the following diagnostics: raw_aio_remove: aio request not found! Unfortunately I wasn't able to obtain useful stack traces (no debug). qemu was started as: qemu-system-x86_64 -no-kqemu ... This is amd64 stable/7 system (without VFS_AIO), qemu-0.10.1_1. -- Andriy Gapon