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able to reproduce it on my machine I have a working fix > (nowhere close to upstream quality, though) > > The reason why we're seeing "alloc_tag not was set" is > because SLUB allocates empty sheaves for kmalloc > with __GFP_NO_OBJ_EXT and it doesn't teach memory profiling > how to handle this when such sheaves are freed. > > When __GFP_NO_OBJ_EXT is used in alloc_slab_obj_exts(), it later > avoids this "alloc_tag was not set" warning by marking alloc_tags > empty in free_slab_obj_exts(), just before freeing obj_exts. > > And we don't handle this when allocating freeing sheaves > that were allocated with __GFP_NO_OBJ_EXT. > > Passing __GFP_NO_OBJ_EXT skips 1) allocation of obj_exts, > and 2) alloc_tag_add() even when obj_exts is already allocated, > and this confuses memory profiling later. > > I'm adding the fix I have now. (I guess Suren might have some preference > on how to solve it though) > > 1. mark obj_exts allocation failure when slab has no obj_exts and > gfp flag has __GFP_NO_OBJ_EXT, so that a later obj_exts allocation > will mark alloc_tags empty. > > 2. Set alloc_tag when obj_exts is allocated available, > even when __GFP_NO_OBJ_EXT is set. > > Because it's already allocated, we don't have to worry about > recursive allocation. Wait, isn't it much simpler to just do mark_objexts_empty(sheaf); just before freeing sheaves, if s->flags has SLAB_KMALLOC? /me goes to bed anyway -- Cheers, Harry / Hyeonggon