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]) by smtp.lore.kernel.org (Postfix) with ESMTP id E1C12C02183 for ; Fri, 17 Jan 2025 15:28:38 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 641176B0085; Fri, 17 Jan 2025 10:28:38 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 5CA916B0088; Fri, 17 Jan 2025 10:28:38 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 443C46B0089; Fri, 17 Jan 2025 10:28:38 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0012.hostedemail.com [216.40.44.12]) by kanga.kvack.org (Postfix) with ESMTP id 1F14E6B0085 for ; Fri, 17 Jan 2025 10:28:38 -0500 (EST) Received: from smtpin27.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay04.hostedemail.com (Postfix) with ESMTP id BBB161A0304 for ; Fri, 17 Jan 2025 15:28:37 +0000 (UTC) X-FDA: 83017325874.27.7419478 Received: from mail-ej1-f42.google.com (mail-ej1-f42.google.com [209.85.218.42]) by imf25.hostedemail.com (Postfix) with ESMTP id AB0BDA001A for ; Fri, 17 Jan 2025 15:28:35 +0000 (UTC) Authentication-Results: imf25.hostedemail.com; dkim=pass header.d=gmail.com header.s=20230601 header.b=DZ6b3X3V; spf=pass (imf25.hostedemail.com: domain of alexandre.ferrieux@gmail.com designates 209.85.218.42 as permitted sender) smtp.mailfrom=alexandre.ferrieux@gmail.com; dmarc=pass (policy=none) header.from=gmail.com ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1737127715; 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=iefpm1tWscYznjmxr/TrjFDcJponHmThuJ5fxeIBtQ4=; b=NklTx+6gHStP5b61UYNyDSHBS0yP8/fqF2LBKa3/56JanEIQXO9YyvJEMWk8U/Kbt07090 NG3XYdT0ScTJzJ8wE5JC7zg4BmdRpZDdhfk+BLwJLXQnImzQ3kiwV6Q6h8mQFejumVgi4C JZS4nMWoDF5Jq5dkVEbyO35/UptODyY= ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1737127715; a=rsa-sha256; cv=none; b=kQC9/MzAVHwbIf9xe7YIQlzefp14jjAwzAbdIBLQJKqig45SqwnFzWdjSHrR9oyXNsPNyP molaiU6T4kam96P1HJtGbgu+o3xZ216OhVuyAdVJiTD3lJBSDobLzjoq0Nx/vzXu17d3/r DfmGpOW3hTBkSRnS5tpZ7Y+Dn7bKqwg= ARC-Authentication-Results: i=1; imf25.hostedemail.com; dkim=pass header.d=gmail.com header.s=20230601 header.b=DZ6b3X3V; spf=pass (imf25.hostedemail.com: domain of alexandre.ferrieux@gmail.com designates 209.85.218.42 as permitted sender) smtp.mailfrom=alexandre.ferrieux@gmail.com; dmarc=pass (policy=none) header.from=gmail.com Received: by mail-ej1-f42.google.com with SMTP id a640c23a62f3a-aa66c1345caso135596566b.3 for ; Fri, 17 Jan 2025 07:28:35 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1737127714; x=1737732514; darn=kvack.org; h=content-transfer-encoding:in-reply-to:organization:content-language :references:cc:to:subject:user-agent:mime-version:date:message-id :from:from:to:cc:subject:date:message-id:reply-to; bh=iefpm1tWscYznjmxr/TrjFDcJponHmThuJ5fxeIBtQ4=; b=DZ6b3X3VHavb9bg8NcZ7sZDwfQqiPIbd2hDtBv0lrI0Lf+gUxciTT4iX9LT81SiuJt I8ovystmFMOfOAtOFBVge5MNLrW38AcSyVo76ctOqMow57yp+c+6qmFEVhoYjg+aKIrn mOVAaR5yVrdUgodeDDlOb0HfT9eJ/l/gHaekIU9DBO3TCm/AxxYrJ1Ea/XSnAX6p5QYr wvoJNpL92bM1ppH+xhKuPcUo2ojMDUHGR13Q0VXyG63G5KStK/KYeIHIASNTsHSm6kQa 7Ct+nXDXVxYB8xUSqhN2CGAJAnQnJXm3A6LuWbp4BBCvg/7eGor4CVS4BhugA6uT0A9Q rqIw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1737127714; x=1737732514; h=content-transfer-encoding:in-reply-to:organization:content-language :references:cc:to:subject:user-agent:mime-version:date:message-id :from:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=iefpm1tWscYznjmxr/TrjFDcJponHmThuJ5fxeIBtQ4=; b=KszL91CGfxrhEYXKUO+46Y2iKlG2bZ/M+ixG0k5lY5+MFOyt/TkBl0OGqSUxEwqFb/ qSEX35DUEX0h6U2D/Y2dwLN0Aobb5OaYkoNWpcKovPbNB0haiN43p/BJW2js+r+oU1oE a8NXGsAPo7eYejYQnNn4JcbFAXYRoxcn6RUAvDzOKX+aIQlKHojPb0IaNrnhNyvMk/jM GVi1Shq93/bZy4SQ9w8kKQiL2tSuJcmpNJ4z57gxjiezR8rM0kc4BZZp95cjSitGxOn/ LndTWBeMRsX065GpXIxWdh9zXYGLy2bkuDPXXDxSU2QnXhrvNLJF3w6c/oBWzlbWId0P hXbA== X-Forwarded-Encrypted: i=1; AJvYcCXPMouP348JVJMCy50+6PSBYsg7UiX5h9mDuTlMq5erKTahGT1L3Avz37OmiaIZ9XdDgG0/QT5Axw==@kvack.org X-Gm-Message-State: AOJu0YzXHF1HhvEDE6yyZ26GgMt6gs6bp4nANKmrRcc49A35zUZ25XRA iPp1TmCFwZ/6AlD82vmOC5qn3NHe8L4kZsnpzGrCLaZFtY2+SrHs X-Gm-Gg: ASbGnctzJpai6vqSO36yRVMmg8y+/vi3/LXuX9h09nfU2cDNENEHPJysDs6cuUTdatN xUYmsAloZ+W3+NRZX4DPk2QtiajE/69EB5wxuXiSB2jF9uNZrlZN+k0qmYWjFHDKfiO8Zw3zk5d 2DZVWsoP3r2uTWOu0STjN1rDFMK8lBvgrPFIBWhSJZBv4poi1cqeLtGadMDGq4VY0WtZTaAXd3D ldkXCSgci8d3CnSu/l7KLnVjH/EmVRX0As8cuT0kb0JHIJR1XocT1A0BEJTOfVbxC0v X-Google-Smtp-Source: AGHT+IFvDqQ3MnMlQU4wRKoEsDKrZcCgzf7yFd94JCm7WM557HmLRON2auih42IkHmPLGrBOu6M4TA== X-Received: by 2002:a17:906:f58d:b0:aa6:79fa:b486 with SMTP id a640c23a62f3a-ab38b4c6ae5mr352886966b.49.1737127713967; Fri, 17 Jan 2025 07:28:33 -0800 (PST) Received: from [127.0.0.1] ([193.252.113.11]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-ab384c60772sm187435166b.33.2025.01.17.07.28.33 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 17 Jan 2025 07:28:33 -0800 (PST) From: Alexandre Ferrieux X-Google-Original-From: Alexandre Ferrieux Message-ID: Date: Fri, 17 Jan 2025 16:28:32 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: Bug: broken /proc/kcore in 6.13 To: Alexandre Ferrieux , Lorenzo Stoakes , Steven Rostedt Cc: linux-trace-users@vger.kernel.org, LKML , linux-mm@kvack.org References: <05ea473e-d7e9-4ca5-ad91-ba8c00618fb4@orange.com> <20250117084038.79f40307@gandalf.local.home> <4fd7e1a3-f7ff-4b9d-9a53-fb73795b5b3d@lucifer.local> <789848f7-680c-41a0-8edd-64e8af1f2f4b@orange.com> Content-Language: fr, en-US Organization: Orange In-Reply-To: <789848f7-680c-41a0-8edd-64e8af1f2f4b@orange.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: AB0BDA001A X-Stat-Signature: ys8gox1ccodgyzxiw71zfxt445u1dwsm X-Rspam-User: X-Rspamd-Server: rspam12 X-HE-Tag: 1737127715-882241 X-HE-Meta: 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 dOJm69Kv 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.167024, 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 17/01/2025 16:19, Alexandre Ferrieux wrote: > On 17/01/2025 15:44, Lorenzo Stoakes wrote: >>> Alexandre Ferrieux wrote: >>> >>>> Hi, >>>> >>>> Somewhere in the 6.13 branch (not bisected yet, sorry), it stopped being >>>> possible to disassemble the running kernel from gdb through /proc/kcore. >> Thanks for the report! Much appreciated. >> >> I may try to bisect here also unless you're close to finding the commit that >> broke this? > > I'm currently homing in on copy_page_to_iter_nofault(), will report shortly :) Hmm, actually, that baby ain't cooperative: [Fri Jan 17 15:23:05 2025] trace_kprobe: Could not probe notrace function copy_page_to_iter_nofault ... if I cannot insert kprobes to sniff around, I'm a bit stuck :} So I think you'll reach the goal faster than me ! PS: For your bisection: the last working kernel I know of is Debian's 6.12 final: ii linux-image-6.12.9-amd64 6.12.9-1 amd64 Linux 6.12 for 64-bit PCs (signed)