From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751485AbdB0NBn (ORCPT ); Mon, 27 Feb 2017 08:01:43 -0500 Received: from mail-eopbgr40131.outbound.protection.outlook.com ([40.107.4.131]:45338 "EHLO EUR03-DB5-obe.outbound.protection.outlook.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1751341AbdB0NB2 (ORCPT ); Mon, 27 Feb 2017 08:01:28 -0500 Authentication-Results: spf=none (sender IP is ) smtp.mailfrom=aryabinin@virtuozzo.com; Subject: Re: [lkp-robot] [x86/mm/ptdump] 243b72aae2: WARNING:at_arch/x86/mm/dump_pagetables.c:#note_page To: kernel test robot References: <20170227010341.GA32284@yexl-desktop> CC: Thomas Gleixner , Alexander Potapenko , Mark Rutland , Tobias Regnery , Dmitry Vyukov , LKML , Linus Torvalds , , Ananth N Mavinakayanahalli , Anil S Keshavamurthy , "David S. Miller" , Masami Hiramatsu From: Andrey Ryabinin Message-ID: <34aa4f8e-190a-8895-bf43-22d3f08efd17@virtuozzo.com> Date: Mon, 27 Feb 2017 16:01:34 +0300 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.7.0 MIME-Version: 1.0 In-Reply-To: <20170227010341.GA32284@yexl-desktop> Content-Type: text/plain; charset="windows-1252" Content-Transfer-Encoding: 7bit X-Originating-IP: [195.214.232.6] X-ClientProxiedBy: VI1PR09CA0083.eurprd09.prod.outlook.com (10.174.49.155) To AM5PR0801MB2051.eurprd08.prod.outlook.com (10.168.158.141) X-MS-Office365-Filtering-Correlation-Id: f72a0e4e-06c3-4c77-cd37-08d45f109af0 X-Microsoft-Antispam: UriScan:;BCL:0;PCL:0;RULEID:(22001);SRVR:AM5PR0801MB2051; X-Microsoft-Exchange-Diagnostics: 1;AM5PR0801MB2051;3:dyHnCQ3zrDnf2VUEvF2AkKHpDFggO5+8iqv8j8MiYwpIv7L7mJSaK47W5mK6iTiEbhVoRKGIl2uxtaH1jsoMq6nT5IjVeCvLiWHi7FZrNLgzQi3ZoWV/g+XIo/EQ12aSBlyBdUKEl76qhoYmGgInhTcklLD7g9YKT/jml7bztRMs7N+UNQAVdySa1CCN+EbYdBN92SG+5L4vIkzszZgPgMPHSywEKw/StTk5U+Cn41pnfjGhZdhHQnu5qL9yUQlDi7T4yUnEJn4W2gAbm7rmxQ==;25:3hzMahnOROzIHqfATNAl+wGF3cshliVcKlenBQK4tNIrju8jGaIkGaRSWGgARo6kC3A+p0IYkhCBeCKX33PeuaG24isIbjHJfIU4JDxxFo6/++2ct2pRu7f1ysGTpzn3glgv4idcB/ZKST/nFtYxAQgGCuqamhpJRE1FXP+hQDzncwYluS95lcDgGi3V77Zfcqh4ytbtvZQElVQBY+aQ8mwA8hgMvOHMzFyLqqkdp2QyXn1zVVy+RTRln6FSOVPfqPkDc+gPxT/Z5w3MA/mZhAP0YJnAaWAetlOwpv7b8b4MAjISWY0gu1VTyDOgGKzLjUu0L4eZvywt4VFX05wRroNxXmwqmYx68maRnkAsA+bAedSDHeWjR8jeaYog2xLTVranM5LS+alncEjYfnklLUi8Uar6lvlntJXBFRLKoCd7MsGPTc8MQB+/ha6Rp4KKDRCKyC3wM+n7vK293Usv8w== X-Microsoft-Exchange-Diagnostics: 1;AM5PR0801MB2051;31:/nrOEWdnpbCxbxV0AaG7Sym6ntxSEXffUvG82ihrv5uBcgp5unGMUVboD5IOFwG2Fjip7SVj/38cgNXWk5nIPuFoFzywzhL0FuIOKUfJMVHxQmzZ1gOpeUtyxSpW0mhavbmYbp17Vx9IPh7l8z/TDRcsWI1GjZyCfG202JN8GzYyeqQmXQmmsd3OiQzd7QEAn77AEUGj+E2IsL4mlGktFosc69TLCDmOrK9m/vl9rz2C+MQj2902I/EEzv1uVtSNHjy/FTcIhGQtpxMgRGJQXA==;20:i20kBL00lY+f3OUKhtZLjc5Sj243N14zQ1PdJIH3M2FuX1TrcS9LSB9rSHEhT/ZNtoqc7RiJQUcEXkTKX5R41naOkRiLt1AhITaBvtGgoCOHGakrfh7TXi2va+gsvrN7n7ojPUct38zTK0JEVJSIsbQ4ZF9PiIXu2E2+Gs9ebct3s/cY3n9pmUpBu5BWFG32a0NK190B8vL1uea3DZUCkfzQiutAqm+mCi7kqsSTv4SpGXqjKdOtLNNkVEolMiLH1J+RzM18Ua4YOJZ7UthhIacPFIh1sekW/mp7SnKqQklcfiYrAOwLr2LU08Gr7TuFHaNSo+DkpFrbe9wQKGzthmKhRImLCydlcZUrIo7FkMxSl72AmsQWZ3ybVrMycjVSK65LTuxtXdw/2GZia28gARYOHFyXD2VCp7sUPSawoAU= X-Microsoft-Antispam-PRVS: X-Exchange-Antispam-Report-Test: UriScan:(84791874153150); 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This WARN is also reproducible on the parent commit 5b1ad68f9b. The only difference here is that on parent one needs dozens of seconds to reach this WARNING. It seems that this time difference somehow confused the robot. As for the warning itself, it caused by kprobes. krpobe code use module_alloc() which creates these RWX mappings. I'm not sure how to fix this as AFAIK kprobes actually need RWX mapping. > > [ 25.592875] WARNING: CPU: 0 PID: 1 at arch/x86/mm/dump_pagetables.c:226 note_page+0x820/0xaf0 > [ 25.592875] WARNING: CPU: 0 PID: 1 at arch/x86/mm/dump_pagetables.c:226 note_page+0x820/0xaf0 > [ 25.597768] x86/mm: Found insecure W+X mapping at address ffffffffa0000000/0xffffffffa0000000 > [ 25.597768] x86/mm: Found insecure W+X mapping at address ffffffffa0000000/0xffffffffa0000000 > [ 25.601564] Modules linked in: > [ 25.601564] Modules linked in: > [ 25.603072] CPU: 0 PID: 1 Comm: swapper/0 Tainted: G B 4.10.0-rc8-00007-g243b72a #2 > [ 25.603072] CPU: 0 PID: 1 Comm: swapper/0 Tainted: G B 4.10.0-rc8-00007-g243b72a #2 > [ 25.607397] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.9.3-20161025_171302-gandalf 04/01/2014 > [ 25.607397] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.9.3-20161025_171302-gandalf 04/01/2014 > [ 25.611819] Call Trace: > [ 25.611819] Call Trace: > [ 25.612954] dump_stack+0x63/0x8d > [ 25.612954] dump_stack+0x63/0x8d > [ 25.614457] __warn+0x10d/0x130 > [ 25.614457] __warn+0x10d/0x130 > [ 25.615885] warn_slowpath_fmt+0x4a/0x50 > [ 25.615885] warn_slowpath_fmt+0x4a/0x50 > [ 25.617775] ? _raw_spin_unlock_irq+0x22/0x40 > [ 25.617775] ? _raw_spin_unlock_irq+0x22/0x40 > [ 25.619940] note_page+0x820/0xaf0 > [ 25.619940] note_page+0x820/0xaf0 > [ 25.621416] ptdump_walk_pgd_level_core+0x420/0x480 > [ 25.621416] ptdump_walk_pgd_level_core+0x420/0x480 > [ 25.623820] ? 0xffffffff81000000 > [ 25.623820] ? 0xffffffff81000000 > [ 25.625369] ptdump_walk_pgd_level_checkwx+0x12/0x20 > [ 25.625369] ptdump_walk_pgd_level_checkwx+0x12/0x20 > [ 25.627604] mark_rodata_ro+0x112/0x120 > [ 25.627604] mark_rodata_ro+0x112/0x120 > [ 25.629364] ? rest_init+0xe0/0xe0 > [ 25.629364] ? rest_init+0xe0/0xe0 > [ 25.630915] kernel_init+0x2a/0x120 > [ 25.630915] kernel_init+0x2a/0x120 > [ 25.632542] ? rest_init+0xe0/0xe0 > [ 25.632542] ? rest_init+0xe0/0xe0 > [ 25.634340] ret_from_fork+0x2c/0x40 > [ 25.634340] ret_from_fork+0x2c/0x40 > [ 25.635989] ---[ end trace 583b8aa56cec4492 ]--- > > > To reproduce: > > git clone git://git.kernel.org/pub/scm/linux/kernel/git/wfg/lkp-tests.git > cd lkp-tests > bin/lkp qemu -k job-script # job-script is attached in this email > > > > Thanks, > Xiaolong >