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a=xqWC_Br6kY4A:10 a=kj9zAlcOel0A:10 a=HzLeVaNsDn8A:10 a=GoEa3M9JfhUA:10 a=VkNPw1HP01LnGYTKEx00:22 a=Mpw57Om8IfrbqaoTuvik:22 a=GgsMoib0sEa3-_RKJdDe:22 a=kF5L51yoLD6jj29ABkYA:9 a=CjuIK1q_8ugA:10 X-Proofpoint-ORIG-GUID: ZWKloSKwTFMSXgZZGqSsnRUieKPqOnE2 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMjI0MDExOCBTYWx0ZWRfXzqh7LbOQMyOn k62hmnBDhahM8jWRRwWO00Wg9Je1Q8Vauj32GgzVsinytpanj+BOYmMWMhkYH0xNuwA3i/XVW5V 1S32OdlyEpKMi9Q/3dUpvGFS91Rtt3f8Vd+yILISIwA8/ha/RSdkjLUir+zyxbjjagmCgzgHEqL RCeqJ5eHK5BTfEWO5SvY3zk9wCR1L3mq4LhXvjlvyWq882z1kpdyqFxS28cM6IHURk9s0rZr6f7 dCXdP9Qa8cg/IUykrNkhez2YecnbtRO/R9ovByCk7GWP2o9h6x6cqhUodR5AnB7jMJbKHsDO2NB suybJmLLjEzA6ylW30zV4qGG5fP0CUcTSR9yb9LJR3NdE3geMjeSW5hW21D4LTRWzxLY8P5DsQT /sxocyUK6xSur3UE7Kbk2i/dbowDhOvreaYRnOmxmnN6eJ86mDFLBVijqa5Arf9/tOlhQikAI6n rxUkY+bZWqG0yt3v89A== X-Proofpoint-GUID: ZWKloSKwTFMSXgZZGqSsnRUieKPqOnE2 On Tue, Feb 24, 2026 at 11:16:12PM +0900, Harry Yoo wrote: > Just sharing updates on this before going to bed... > > I was 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