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 mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 8520AC433F5 for ; Fri, 19 Nov 2021 01:17:58 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 67C1061AE3 for ; Fri, 19 Nov 2021 01:17:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233957AbhKSBU5 (ORCPT ); Thu, 18 Nov 2021 20:20:57 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:50856 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232992AbhKSBU4 (ORCPT ); Thu, 18 Nov 2021 20:20:56 -0500 Received: from mail-pl1-x62a.google.com (mail-pl1-x62a.google.com [IPv6:2607:f8b0:4864:20::62a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1EC99C06173E for ; Thu, 18 Nov 2021 17:17:56 -0800 (PST) Received: by mail-pl1-x62a.google.com with SMTP id o14so6844744plg.5 for ; Thu, 18 Nov 2021 17:17:56 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; h=date:from:to:cc:subject:message-id:mime-version:content-disposition; bh=6AfrWqxmB5aB4ZGeiNoE2R85nQDZ46at+khLZSw0l0o=; b=HjaHewp7flA94eL4qWe8sqMsCdSxYn6i6HFgmglvYfT9jYsJoam0+ztTBjal0zH46W EJ6mpsjj6vdX/mgBbHe97rYURB/gt3Be2GG/TJ2fOyi9THqS1IN7Tdqb0rLefj5QU72a b43V0eHSaaK9AB+CsJivVzWfF/Kb4KNvFl8FI= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:date:from:to:cc:subject:message-id:mime-version :content-disposition; bh=6AfrWqxmB5aB4ZGeiNoE2R85nQDZ46at+khLZSw0l0o=; b=6ZaAOzUWJUj3X9xdUps6ZUMr2aAN+jvoKy1y37lTb6iNI1oIFrW4EszKaYl8Hw2/2W vR94Gw63rNlpGX1ON6FLDmA418uMMdnV8bsUmL6ulzYS+3iBocJkFKbWB5mH6zAu0K+F cOrJZPt4rqFEjd2rsLL4zxVl39kGjDtBqQXSSExyhgwt9PalukPkoocRQsnEmYhAPXzS LsNmgY9lAQwPt3BPsuub+hbSBhu9lMnLmULO5LRnur3/8JA6C3SFWWnt9ofS1Ov1FAFL 7ftJQzF4l0i4DUh3oz2SaX6Z8YnJ02rxaTReb/fC3d3Sju/gTr63GP1yZcXlpsU51qr3 zAtg== X-Gm-Message-State: AOAM533UAczbVaoOlXrccPSlRR/eKsowGgvqZTZ+s/G8kA9mfSbufkht SS5bevdm3b3PC8GV9ghXE+K3iQ== X-Google-Smtp-Source: ABdhPJxkiDzH5QOCGgb712/rAsh1S8e6Arwh50ncc9fu7gaPXqp44R+ghb3LnM88HSWN0UqiTMXo0g== X-Received: by 2002:a17:903:2292:b0:141:e76d:1b16 with SMTP id b18-20020a170903229200b00141e76d1b16mr25268556plh.21.1637284675630; Thu, 18 Nov 2021 17:17:55 -0800 (PST) Received: from google.com ([240f:75:7537:3187:f3c1:d25d:4dc6:f786]) by smtp.gmail.com with ESMTPSA id mi18sm696430pjb.13.2021.11.18.17.17.53 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 18 Nov 2021 17:17:55 -0800 (PST) Date: Fri, 19 Nov 2021 10:17:50 +0900 From: Sergey Senozhatsky To: "Kirill A. Shutemov" , Jeff Moyer , Andrea Arcangeli , Suren Baghdasaryan , Dan Williams , Andrew Morton Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: mm: gdb fails if binary is on a DAX-enabled filesystem Message-ID: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello, We are running into issues on a DAX enabled system: both __copy_from_user_inatomic() fail. [ 28.914865] ------------[ cut here ]------------ [ 28.915800] WARNING: CPU: 0 PID: 106 at mm/memory.c:2822 wp_page_copy+0x136/0x320 [ 28.916857] CPU: 0 PID: 106 Comm: gdb Not tainted 5.15.0-01277-g6be711548944 #1 [ 28.917823] Hardware name: ChromiumOS crosvm, BIOS 0 [ 28.918455] RIP: 0010:wp_page_copy+0x136/0x320 [ 28.919001] Code: f1 79 00 4c 89 7b 50 48 8b 43 38 31 d2 49 39 07 75 23 48 8b 7d c8 48 8b 75 c0 ba 00 10 00 00 e8 6f 23 78 00 b2 01 85 c0 74 0b <0f> 0b 48 8b 7d c8 e8 8e 1f 78 00 48 8b 7b 58 88 55 c8 e8 2e f2 79 [ 28.920642] RSP: 0018:ffffc900005dfbd8 EFLAGS: 00010206 [ 28.921135] RAX: 0000000000001000 RBX: ffffc900005dfc40 RCX: 0000000000001000 [ 28.921762] RDX: 0000000000001001 RSI: 0000000000448000 RDI: ffff8880007bb000 [ 28.922410] RBP: ffffc900005dfc28 R08: ffff8880031884c8 R09: 0000000000000000 [ 28.923058] R10: ffff88800f8234c8 R11: 0000000000000000 R12: ffffea000001eec0 [ 28.923718] R13: 0000000000000000 R14: ffff88800e18e630 R15: ffff888000884240 [ 28.924404] FS: 00007e5b49744180(0000) GS:ffff88800f800000(0000) knlGS:0000000000000000 [ 28.925146] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 28.925688] CR2: 0000000000448000 CR3: 000000000e0d6000 CR4: 0000000000350eb0 [ 28.926368] Call Trace: [ 28.926622] __handle_mm_fault+0x67e/0xbd7 [ 28.927018] handle_mm_fault+0x16b/0x23d [ 28.927390] __get_user_pages+0x2d6/0x4b7 [ 28.927797] __get_user_pages_remote+0xbe/0x20c [ 28.928224] __access_remote_vm+0xb3/0x1c8 [ 28.928655] ptrace_access_vm+0x97/0xb0 [ 28.929036] generic_ptrace_pokedata+0x22/0x31 [ 28.929452] arch_ptrace+0x1ce/0x1dd [ 28.929801] __do_sys_ptrace+0xa9/0xda [ 28.930161] do_syscall_64+0x75/0x8b [ 28.930511] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 28.930996] RIP: 0033:0x7e5b4c86fe5a [ 28.931332] Code: 70 41 83 f8 03 c7 44 24 10 08 00 00 00 48 89 44 24 18 48 8d 44 24 30 8b 70 08 4c 0f 43 d1 48 89 44 24 20 b8 65 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 3e 48 85 c0 78 06 41 83 f8 02 76 1b 48 8b 4c [ 28.933086] RSP: 002b:00007ffdc3369150 EFLAGS: 00000202 ORIG_RAX: 0000000000000065 [ 28.933767] RAX: ffffffffffffffda RBX: 0000000000448620 RCX: 00007e5b4c86fe5a [ 28.934476] RDX: 0000000000448620 RSI: 000000000000006d RDI: 0000000000000005 [ 28.935206] RBP: 0000000000000001 R08: 0000000000000004 R09: 0000000000448620 [ 28.935916] R10: 00841f0f2e6666cc R11: 0000000000000202 R12: 0000000000000001 [ 28.936672] R13: 00841f0f2e6666cc R14: 0000000000000000 R15: 00007e5b49743958 [ 28.937389] ---[ end trace 2808c0ffd7259839 ]--- Program received signal SIGSEGV, Segmentation fault. Is there anything we can do about it?