From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id A474ECCD1A5 for ; Wed, 22 Oct 2025 00:15:46 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id C63DC8E0003; Tue, 21 Oct 2025 20:15:45 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id C3A6F8E0002; Tue, 21 Oct 2025 20:15:45 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id B508A8E0003; Tue, 21 Oct 2025 20:15:45 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0011.hostedemail.com [216.40.44.11]) by kanga.kvack.org (Postfix) with ESMTP id 9FB118E0002 for ; Tue, 21 Oct 2025 20:15:45 -0400 (EDT) Received: from smtpin28.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay07.hostedemail.com (Postfix) with ESMTP id 1AE021606AD for ; Wed, 22 Oct 2025 00:15:45 +0000 (UTC) X-FDA: 84023831850.28.2C5659B Received: from mail-ed1-f47.google.com (mail-ed1-f47.google.com [209.85.208.47]) by imf23.hostedemail.com (Postfix) with ESMTP id 08D4C140009 for ; Wed, 22 Oct 2025 00:15:42 +0000 (UTC) Authentication-Results: imf23.hostedemail.com; dkim=pass header.d=soleen.com header.s=google header.b=VsLY7w82; spf=pass (imf23.hostedemail.com: domain of pasha.tatashin@soleen.com designates 209.85.208.47 as permitted sender) smtp.mailfrom=pasha.tatashin@soleen.com; dmarc=pass (policy=reject) header.from=soleen.com ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1761092143; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=lLtBMolvhxZ2nYZ7lKeFnDTLrdScVQzTUS7wwB8pSBo=; b=e81SrwhB/iMmmLdruYj6ONr1nKgj3ZM+ysAnGOWCnxfngJRYg+M1d4ZCjBPOzycqsV6RNA GhvHfUsP16Q1jPG4SlWpf6ilLpfL8uneE4zQJ1N+487B5ooqA33PFPKhjPdweaujAYiwWy 8qjK0/Wh4zls5bd98cqFldmilLvSSGc= ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1761092143; a=rsa-sha256; cv=none; b=6YJQE1NsyZWdCiecdDKOEAD1ohbZqVot+zWtD4vWsZgG9MSKAI4ftlesZtEuCl4u5kc1eK 2/uD43QDlqJKRNzZp6CdsGpp1v+14c0uxNVHRGNL4fgvApTx748j8lypktBoo+88uAfSMN kNNkbYNSo+LW0n/Z5hBY49wkclLWfBo= ARC-Authentication-Results: i=1; imf23.hostedemail.com; dkim=pass header.d=soleen.com header.s=google header.b=VsLY7w82; spf=pass (imf23.hostedemail.com: domain of pasha.tatashin@soleen.com designates 209.85.208.47 as permitted sender) smtp.mailfrom=pasha.tatashin@soleen.com; dmarc=pass (policy=reject) header.from=soleen.com Received: by mail-ed1-f47.google.com with SMTP id 4fb4d7f45d1cf-63c3c7d3d53so7532970a12.2 for ; Tue, 21 Oct 2025 17:15:42 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=soleen.com; s=google; t=1761092141; x=1761696941; darn=kvack.org; h=content-transfer-encoding:cc:to:subject:message-id:date:from :in-reply-to:references:mime-version:from:to:cc:subject:date :message-id:reply-to; bh=lLtBMolvhxZ2nYZ7lKeFnDTLrdScVQzTUS7wwB8pSBo=; b=VsLY7w82vw9Oh7HBqiUASxv/Mo6pw+uS8ICzhB/FkiVEkJMDF5NW+87cCV4nmefyXb l8QNMA8B/wdf9PD/wZJr4m4oodPzYpIuAAwQE1OKxZLZXoBn9fpkaILSvHBTOR/bYQT8 aFCkGbxFa+CCpF/7L6UTytkxeX7/kmun1NjFMYnak+/1/usUY2zMHRLhTZI1gBzYu8Ei 90oSLMgeqtV8hd2tQi8fTcyP6RYR3yZNDgfHAJMA93gP5/mqMT+hWWM9ka5+D9bDvzVx hwlP6BawogkueFmZXW74QAPef9ygHmSwkvrqyhbfact+1i9EIfQRAh/llYrlzkvmxo6Q rtvg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1761092141; x=1761696941; h=content-transfer-encoding:cc:to:subject:message-id:date:from :in-reply-to:references:mime-version:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=lLtBMolvhxZ2nYZ7lKeFnDTLrdScVQzTUS7wwB8pSBo=; b=P1nZn5da6QDNrYnFtkdqI5WgPM/4Wdy3DOiXWDauRjY1YJySkM5VN7StnQ4gUNAHbz XylRZhjbDRRD/nY2lRHPIYTVg+0FMnZZgma9N6HxZYSyWjPEA1Th0R4gsbx4XSm0ppZ2 +HZbzv+NHV+9Ful/KFAwmUd0+oTZPwdQSrzvmVx8qpbmTBGdimKo2K7t8T32A7fiVGnC j8PXTM1NgqRnmT/v4VBTF3++enc+o/DrzKEqx/igKEDgTGVzECqEOU0M987aFLATYuoS BGwPm9z1KqZCI7DCNqihQQKso9P3tqKXcGTj4O7O3c47p9+Ml8NbHmjKuaZ/CJq5BAj9 9Upg== X-Forwarded-Encrypted: i=1; AJvYcCX/MLRnVSTVEaja5Wq/25o0Bi8HvZr6YvFNSVHb2GOQ0Y83b2FDxPUr7byoCzS7f8hcpxMZhaV5bQ==@kvack.org X-Gm-Message-State: AOJu0YycneO0hsX6nv2+cl5yYikPCBxsD95qkyi9+GfpFgb8o4OcpLnV 5+qo4RCOK3vJ4o5btRwpKnK7eCI3qRKy08S0XjLlRK1GoT/Xt1ttdISs4JOE4PbcR7U/asuF3Sd D7BstSWHDsn+W77/DQPpG1GmdX3SZoppaF8pUAd+uGA== X-Gm-Gg: ASbGncuy7SjKSVLIZ2DV2J1EUye43cp+ri7xdfQLpFM7eDmUQeI+gBAjf9N61M+23/g ctv0haOrVRX4GJgOOgLtl+SduEodDd4f+KICsVZIRoQsWZxXD8PsfUDsEPwkU11LuM807OiR9Vl oYQPw2bY0+S1mrkZmGEzdzRV3KFemyTFCRwli0UIgxpmE9xCnGB+cbw+Rkm3gvHvAVVC+gvUQ8O cADbozgZlUp1eUTylxjICPYjv4H828AKfrKXDRcg9ckzvwfhtJH8l7Yc4JfbArJX4PU3nu9mdh/ Ygg= X-Google-Smtp-Source: AGHT+IGEuNUf1RCSQwHL6z3gwL7zUADiyfawv+wMX5M61bryfLVp3bld3mKFx8Y8DLsaMjtsAzBcptrVbG9BZA3Wnzk= X-Received: by 2002:a05:6402:d09:b0:633:7b1e:9aa3 with SMTP id 4fb4d7f45d1cf-63c1f6f6269mr18383154a12.34.1761092141269; Tue, 21 Oct 2025 17:15:41 -0700 (PDT) MIME-Version: 1.0 References: <20251021000852.2924827-1-pasha.tatashin@soleen.com> <20251021135331.8e0185a173a5fa40add60802@linux-foundation.org> In-Reply-To: <20251021135331.8e0185a173a5fa40add60802@linux-foundation.org> From: Pasha Tatashin Date: Tue, 21 Oct 2025 20:15:04 -0400 X-Gm-Features: AS18NWDlyfI6cWth3r_g0r1Pr5LDh2e3c5ckbdEBRacQjSIvh3eM9w5sLU_efF0 Message-ID: Subject: Re: [PATCH v3 0/3] KHO: kfence + KHO memory corruption fix To: Andrew Morton Cc: Mike Rapoport , brauner@kernel.org, corbet@lwn.net, graf@amazon.com, jgg@ziepe.ca, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-mm@kvack.org, masahiroy@kernel.org, ojeda@kernel.org, pratyush@kernel.org, rdunlap@infradead.org, tj@kernel.org, jasonmiu@google.com, dmatlack@google.com, skhawaja@google.com Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Rspamd-Server: rspam05 X-Stat-Signature: ersa71xofm5pibnc34giqmseoi4h197n X-Rspam-User: X-Rspamd-Queue-Id: 08D4C140009 X-HE-Tag: 1761092142-156590 X-HE-Meta: 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 eSmicLZz a3mnKi0hnOQqWGAgDU9+tj4CHKvorx+33X2DHpCSKdeY890U+kadgt+ecrdn9c5SrkJIbct8qDMd3hS6+hl8f7o6bpYG2J0ctlMBy/gUE/AxUzWJGXOBkAn4bIMF9m/zXrm+2tTMLJ6QcMtDlbInqOtsQ4CMm92UAuwEg6lR21zB2+tEfzmldwGqduxae4te2o7VFgARm2h23x5+k+FsXFI9gUSvYR7ruZN4nr1DpGa7NLEh2LHE42sCxWkXGCUAboAjIW5YePojAM4Gxx1A8aPzyhZgbBlHpBBGDjpqSzfCbbnpPuM83gapPmQ== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Tue, Oct 21, 2025 at 4:53=E2=80=AFPM Andrew Morton wrote: > > On Tue, 21 Oct 2025 12:04:47 -0400 Pasha Tatashin wrote: > > > > With liveupdate: dropped from the subjects > > > > I noticed "liveupdate: " subject prefix left over only after sending > > these patches. Andrew, would you like me to resend them, or could you > > remove the prefix from these patches? > > No problem. > > What should we do about -stable kernels? > > It doesn't seem worthwhile to backport a 3-patch series for a pretty > obscure bug. Perhaps we could merge a patch which disables this We are using KHO and have had obscure crashes due to this memory corruption, with stacks all over the place. I would prefer this fix to be properly backported to stable so we can also automatically consume it once we switch to the upstream KHO. I do not think disabling kfence in the Google fleet to resolve this problem would work for us, so if it is not going to be part of stable, we would have to backport it manually anyway. Thanks, Pasha > combination in Kconfig, as a 6.18-rcX hotfix with a cc:stable. > > Then for 6.19-rc1 we add this series and a fourth patch which undoes > that Kconfig change?