Alright, the failing code seems to be in mm: if (flags & FOLL_PIN) atomic_set(¤t->mm->has_pinned, 1); Apparently you can't rely on current->mm being valid in this context; it's null here, hence the +0x64 for has_pinned's offset. This was added by 008cfe4418b3 ("mm: Introduce mm_struct.has_pinned"), which is new for rc7 indeed. The crash goes away when changing that to: if ((flags & FOLL_PIN) && current->mm) atomic_set(¤t->mm->has_pinned, 1); But I haven't really evaluated whether or not that's racy or if I need to take locks to do such a thing. _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/dri-devel