From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-wm1-f50.google.com (mail-wm1-f50.google.com [209.85.128.50]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 7D87E2E62A9 for ; Fri, 10 Apr 2026 23:14:30 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.128.50 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1775862871; cv=none; b=PqCizvND0WCpbyCdLcKewUgsdD6gKyXYwKB1eGnKGIVADtSf/I51cJAd5S3pPr5StUshsKwtTBeHmLIrJ6A4+6AGHJ9MBq0fei6uVyBe60E0Yta/MlA1vADOfmIjCRorZhZ+vytXDw2wO8UKfPkqCKKIaP6fpH39WYkxMpvAHa0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1775862871; c=relaxed/simple; bh=Hv5/H6AF6QFs+U1qJggHq11fW7HDezjk1yU985N/JqA=; h=Message-ID:Date:From:To:Cc:Subject:Content-Type; b=BLcFcfouOWtyx+2tytpU+1gO5zMs+HZ6WZNR6AnEuKYZzzSFawXPS9LdVwiGyVSBaMvCfZxg3KEFvZywc8UR7vOjigspo2gk7ZeoRCrUo6BTo81iu+wqJWYGll+ST7QUmTz4lHWyz5Q7SDx7r8lPn6kLg+RLHRlkHJTk+suj/fc= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=hnk5T7e2; arc=none smtp.client-ip=209.85.128.50 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="hnk5T7e2" Received: by mail-wm1-f50.google.com with SMTP id 5b1f17b1804b1-488ba6366a7so31450555e9.0 for ; Fri, 10 Apr 2026 16:14:30 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20251104; t=1775862869; x=1776467669; darn=vger.kernel.org; h=subject:cc:to:from:date:message-id:from:to:cc:subject:date :message-id:reply-to; bh=QkSzhx4T5UppzPUxsq1ow8P6mxw7Nwf60UEUxtk5Ai8=; b=hnk5T7e2DKW7SWsiatoC393B3tPsy3zezhVkDI85Uha9YhMOWWEMVBx+1oCLzN7BP+ 6EUEO98TH5goxzwge36vxgCfl3sGk0+3zih2C9UuL/AqqKD89G4Vq8SCQbRqbpseRHH7 xswxuMPorCl/AT+Qav+JSgeI4mxSwaHz0BXuAmpn7BjYhLLrSLT4Ev6wcuxXYNbXuo2O 4Z0TtLyfsPGey+TDJw32pOqFcWi+m8av7BJmw21zigLbjVjSutYpxFrhcU/pdOfQAk6T ldoWfJmNjrpxlbAcJa9wqluytifu+0tozierXgSo6RsJa1c5LXpMmhYliO/K701+SpOK 1e+g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1775862869; x=1776467669; h=subject:cc:to:from:date:message-id:x-gm-gg:x-gm-message-state:from :to:cc:subject:date:message-id:reply-to; bh=QkSzhx4T5UppzPUxsq1ow8P6mxw7Nwf60UEUxtk5Ai8=; b=ZTgZelMjAptof+7FekzebjaFUIEuBIQpUMrv691Byz5ke8mlRYrEXMYtKj62f0qWb4 HfBl+CNdKyKOJDfwbUw0Jm/d9H0qgdrvJyVvQJcv5/zoAjbizU+XgsTvRPFsObhmlE5Y vSIg7ufT1jfczDnF9kBpKXMeeImnRWpxL8lFOlKl/Niy4GCkoQaQrBpYDhUwqdjWNE3/ /1K4C/Mq8w6cPF2Rzq+OW9ebMtgP21uaQE3xL6kAhbpOPztJQDLGBQycvGyQ2rMOWYtI kIyjsSBH7PkRNnzgcIYJQKMevIjako/DbrCtgsAVUdFBD0q3QZs37e2m98LNhcUoE5UL kPVg== X-Gm-Message-State: AOJu0YxFFBz7Kk/+AGSpbtID0L25nfI6MTXLgXiHf9OrSTiXLi4GLgoo COwS1dScOEa7vfTSrB3N2IpteVJvn/r8aMlAvCtYoa9wxNcdw3OX0US5rS3F5LZ0VA8= X-Gm-Gg: AeBDieutwy0+VQT6beOrr3SDU5Yc2KIDBwXPTaUATGMEhHszH0TwvgFqCdrLpRBT29s 4vmmL4kkswN6A7xf8/axR1Yx8Z9OtUPB9Jkm6sdMNG1NKiVdgL3LWX1mdB8WiaQmXo9bQpwktlT dfNnZg8+aZVrY8DnbMGS/rteBQvj5+WDhWtg0vsGMNSFRUTDvULJXBQ19QUhNwfhhTurX0ZAPUt a1JxfrVfYyBgVJD0kMFbmQx5Ppd2WSX74TVK/WUr3Ov2EZp8KTUalvwf6OexszHOQKddlgye96r j4l9Zk/sVWQlKgSpII0xa6c3Rj/dhfuDXRAQndiI6qCsysEiMFBZ+XNyOIbZEw+4Z4eZIzSbRlC OBl0KJOa8NKjIdlbBkfeB3WktWXr7M86/1gC6JIaHUBLDcDEvdIjt1FBFnSZZTFWMkLxps2JW1N 3FFvhrkjxbmI9qS8GuXFEuid3aFm442yC9RGA= X-Received: by 2002:a05:600c:1987:b0:485:5ba3:37d8 with SMTP id 5b1f17b1804b1-488d67bf736mr60572355e9.5.1775862868677; Fri, 10 Apr 2026 16:14:28 -0700 (PDT) Received: from reporte.txt ([31.221.247.236]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-43d63de3499sm10197674f8f.1.2026.04.10.16.14.27 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 10 Apr 2026 16:14:28 -0700 (PDT) Message-ID: <69d98454.5d0a0220.2786dd.98a9@mx.google.com> Date: Fri, 10 Apr 2026 16:14:28 -0700 (PDT) From: "Adrian Garcia Casado" To: "Linus Torvalds" Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: Re: [PATCH] mm/slub: Revert "mm: Aggressive slab merging heuristics" Content-Type: text/plain; charset="utf-8" Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: On Fri, 10 Apr 2026 18:45:22 -0700, Linus Torvalds wrote: > The so-called "AI optimizations" for SLUB merging are completely broken. > They ignore hardware cache-line alignment requirements on x86_64, leading > to silent memory corruption and eventual kernel panics under heavy load. I can confirm this revert saves the system from the SLUB corruption introduced by the AI-generated patch. Applied cleanly on top of v7.0-rc7. Compiled and running on Fedora (x86_64). I have stress-tested the memory allocator with heavy gaming workloads (Euro Truck Simulator 2 via Wine 11 / fsync) which previously triggered the out-of-bounds writes and stuttering. The system is now rock solid. No kernel panics, no memory corruption, and frametimes are perfectly stable. The Antigravity slop is gone. Ready for the final 7.0 release tomorrow. Tested-by: Adrian Garcia Casado