The 12.1-PRERELEASE (FreeBSD-12.1-PRERELEASE-amd64-20190913-r352266.qcow2) VM image instapanics with the error message: panic: Unregistered use of FPU in kernel stack trace: ... ffs_ckhash_ch bufdone g_io_deliver g_io_deliver g_io_deliver g_disk_done vtblk_vq_intr ithread_loop fork_exit ... I see a similar panic on HEAD snapshots, reproducible as far back as the June-7 snapshot (the oldest one on the ftp server). I'll continue investigating. -Alan