Hi Julien, I ran the apitrace as suggested (what a cool tool!). The replay file appears to recreate the bug. It is 250mb... is that OK to attach? I am running the latest 4.11 kernel from kernel.org, is there really much of a difference with https://cgit.freedesktop.org/~agd5f/linux/log/?h=amd-staging-4.9 ? Luke