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[23.128.96.18]) by mx.google.com with ESMTP id ov7si9036067ejb.224.2020.07.19.20.35.14; Sun, 19 Jul 2020 20:35:39 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=intel.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726468AbgGTDfF (ORCPT + 99 others); Sun, 19 Jul 2020 23:35:05 -0400 Received: from mga11.intel.com ([192.55.52.93]:7005 "EHLO mga11.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726284AbgGTDfF (ORCPT ); Sun, 19 Jul 2020 23:35:05 -0400 IronPort-SDR: ECx2mUo+TDb3ZJ+d18d1qvuAexhQnlCaLwJzwUvDvRqbpvwilHNO8b5lCCJ9vQO7LYfjkU5myb JA0DkstKt2cg== X-IronPort-AV: E=McAfee;i="6000,8403,9687"; a="147805065" X-IronPort-AV: E=Sophos;i="5.75,373,1589266800"; d="scan'208,223";a="147805065" X-Amp-Result: UNKNOWN X-Amp-Original-Verdict: FILE UNKNOWN X-Amp-File-Uploaded: False Received: from fmsmga004.fm.intel.com ([10.253.24.48]) by fmsmga102.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 19 Jul 2020 20:33:03 -0700 IronPort-SDR: eLmgzKUBROfh1FJ8vVCW3YZtqy3YBd+9RCnm5B6BC2dDAzFJppKCTPv0q9X+NDcCmHbFkVejzY 4524rlkXD7Gg== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.75,373,1589266800"; d="scan'208,223";a="309689057" Received: from fmsmsx108.amr.corp.intel.com ([10.18.124.206]) by fmsmga004.fm.intel.com with ESMTP; 19 Jul 2020 20:33:03 -0700 Received: from fmsmsx154.amr.corp.intel.com (10.18.116.70) by FMSMSX108.amr.corp.intel.com (10.18.124.206) with Microsoft SMTP Server (TLS) id 14.3.439.0; Sun, 19 Jul 2020 20:33:02 -0700 Received: from shsmsx154.ccr.corp.intel.com (10.239.6.54) by FMSMSX154.amr.corp.intel.com (10.18.116.70) with Microsoft SMTP Server (TLS) id 14.3.439.0; Sun, 19 Jul 2020 20:33:02 -0700 Received: from shsmsx104.ccr.corp.intel.com ([169.254.5.135]) by SHSMSX154.ccr.corp.intel.com ([169.254.7.32]) with mapi id 14.03.0439.000; Mon, 20 Jul 2020 11:33:00 +0800 From: "Huang, Ying" To: Qian Cai CC: Linux-MM , LKML , Minchan Kim , Hugh Dickins , "Andrew Morton" Subject: RE: linux-next: not-present page at swap_vma_readahead() Thread-Topic: linux-next: not-present page at swap_vma_readahead() Thread-Index: AQHWEmmYtAO3HUjxOE6ed8VDneXiZah4msgAgGI3K9eANWRSjP//lToAgACcUKw= Date: Mon, 20 Jul 2020 03:32:59 +0000 Message-ID: References: <62A0ACFC-E023-4269-8121-F96B879A8C51@lca.pw> <81F06AA9-F25B-4342-9CF7-2763AC394A18@lca.pw> <874ktl1p7y.fsf@yhuang-dev.intel.com> <20200616011334.GA815@lca.pw> ,<20200720021227.GA7354@lca.pw> In-Reply-To: <20200720021227.GA7354@lca.pw> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: yes X-MS-TNEF-Correlator: x-originating-ip: [10.109.78.81] Content-Type: multipart/mixed; boundary="_002_CA2E3DE2DD06CA4FA11644750E4E292F454E3B6DSHSMSX104ccrcor_" MIME-Version: 1.0 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --_002_CA2E3DE2DD06CA4FA11644750E4E292F454E3B6DSHSMSX104ccrcor_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Thanks! Can you try the dbg patch attached? That will print more debuggin= g information when abnormal PTE pointer is detected.=0A= =0A= Best Regards,=0A= Huang, Ying=0A= ________________________________________=0A= From: Qian Cai [cai@lca.pw]=0A= Sent: Monday, July 20, 2020 10:12 AM=0A= To: Huang, Ying=0A= Cc: Linux-MM; LKML; Minchan Kim; Hugh Dickins; Andrew Morton=0A= Subject: Re: linux-next: not-present page at swap_vma_readahead()=0A= =0A= On Mon, Jul 20, 2020 at 12:37:30AM +0000, Huang, Ying wrote:=0A= > Hi,=0A= >=0A= > Sorry for late reply. I found a problem in the swap readahead code. Can= you help to check whether it can fix this?=0A= =0A= Unfortunately, I can still reproduce it easily after applied the patch.=0A= =0A= # git clone https://gitlab.com/cailca/linux-mm=0A= # git checkout v5.8-rc1 -- *.sh=0A= # dnf -y install tar wget golang libseccomp-devel jq=0A= # ./runc.sh=0A= =0A= [ 575.517290][T28667] get_swap_device: Bad swap file entry 58025a5a5a5a5a5= a=0A= [ 575.522901][T28650] BUG: KASAN: slab-out-of-bounds in swapin_readahead+0= x780/0xbd8=0A= swap_vma_readahead at mm/swap_state.c:758=0A= (inlined by) swapin_readahead at mm/swap_state.c:802=0A= [ 575.522928][T28650] Read of size 8 at addr ffff0089a603ffe8 by task trin= ity-c92/28650=0A= [ 575.522947][T28650] CPU: 126 PID: 28650 Comm: trinity-c92 Not tainted 5.= 8.0-rc5-next-20200717+ #1=0A= [ 575.522958][T28650] Hardware name: HPE Apollo 70 /C01_APACHE= _MB , BIOS L50_5.13_1.11 06/18/2019=0A= [ 575.522966][T28650] Call trace:=0A= [ 575.529895][T28667] get_swap_device: Bad swap file entry 58025a5a5a5a5a5= a=0A= [ 575.535819][T28590] get_swap_device: Bad swap file entry 58025a5a5a5a5a5= a=0A= [ 575.535829][T28590] get_swap_device: Bad swap file entry 58025a5a5a5a5a5= a=0A= [ 575.535836][T28590] get_swap_device: Bad swap file entry 58025a5a5a5a5a5= a=0A= [ 575.537424][T28650] dump_backtrace+0x0/0x398=0A= [ 575.537438][T28650] show_stack+0x14/0x20=0A= [ 575.545308][T28667] get_swap_device: Bad swap file entry 58025a5a5a5a5a5= a=0A= [ 575.554134][T28650] dump_stack+0x140/0x1c8=0A= [ 575.554148][T28650] print_address_description.constprop.10+0x54/0x550= =0A= [ 575.554159][T28650] kasan_report+0x134/0x1b8=0A= [ 575.554173][T28650] __asan_report_load8_noabort+0x2c/0x50=0A= [ 575.559496][T28588] get_swap_device: Bad swap file entry 58025a5a5a5a5a5= a=0A= [ 575.559506][T28588] get_swap_device: Bad swap file entry 58025a5a5a5a5a5= a=0A= [ 575.559513][T28588] get_swap_device: Bad swap file entry 58025a5a5a5a5a5= a=0A= [ 575.562203][T28586] get_swap_device: Bad swap file entry 58025a5a5a5a5a5= a=0A= [ 575.562215][T28586] get_swap_device: Bad swap file entry 58025a5a5a5a5a5= a=0A= [ 575.562223][T28586] get_swap_device: Bad swap file entry 58025a5a5a5a5a5= a=0A= [ 575.665163][T28560] get_swap_device: Bad swap file entry 58025a5a5a5a5a5= a=0A= [ 575.671260][T28650] swapin_readahead+0x780/0xbd8=0A= [ 575.671280][T28650] do_swap_page+0xb1c/0x1a78=0A= do_swap_page at mm/memory.c:3166=0A= [ 575.678067][T28560] get_swap_device: Bad swap file entry 58025a5a5a5a5a5= a=0A= [ 575.682774][T28650] handle_mm_fault+0xfd0/0x2c50=0A= handle_pte_fault at mm/memory.c:4234=0A= (inlined by) __handle_mm_fault at mm/memory.c:4368=0A= (inlined by) handle_mm_fault at mm/memory.c:4466=0A= [ 575.682789][T28650] do_page_fault+0x230/0x818=0A= [ 575.682804][T28650] do_translation_fault+0x90/0xb0=0A= [ 575.682819][T28650] do_mem_abort+0x64/0x180=0A= [ 575.687259][T28560] get_swap_device: Bad swap file entry 58025a5a5a5a5a5= a=0A= [ 575.694051][T28650] el1_sync_handler+0x188/0x1b8=0A= [ 575.694064][T28650] el1_sync+0x7c/0x100=0A= [ 575.694079][T28650] strncpy_from_user+0x270/0x3e8=0A= [ 575.694100][T28650] getname_flags+0x80/0x330=0A= [ 575.698001][T28827] get_swap_device: Bad swap file entry 58025a5a5a5a5a5= a=0A= [ 575.698048][T28827] get_swap_device: Bad swap file entry 58025a5a5a5a5a5= a=0A= [ 575.698056][T28827] get_swap_device: Bad swap file entry 58025a5a5a5a5a5= a=0A= [ 575.755679][T28620] get_swap_device: Bad swap file entry 58025a5a5a5a5a5= a=0A= [ 575.757304][T28650] user_path_at_empty+0x2c/0x60=0A= [ 575.764131][T28620] get_swap_device: Bad swap file entry 58025a5a5a5a5a5= a=0A= [ 575.768782][T28650] do_linkat+0x10c/0x528=0A= [ 575.768792][T28650] __arm64_sys_linkat+0xa0/0xf8=0A= [ 575.768802][T28650] do_el0_svc+0x124/0x228=0A= [ 575.768812][T28650] el0_sync_handler+0x260/0x410=0A= [ 575.768820][T28650] el0_sytack+0x24/0x50+0x14/0x20=0A= [ 5ap file entry 58_object+0x58/0x968c/0x1880=0A= [ 575.779790][T28650] __alloc_percpu_gfp+0x14/0x20=0A= [ 575.779799][T28650] qdisc_alloc+0x2bc/0xb98=0A= [ 575.779809][T28650] qdisc_create_dflt+0x60/0x748=0A= [ 575.803406][T28643] get_swap_device: Bad swap file entry 58025a5a5a5a5a5= a=0A= [ 575.806107][T28650] mq_init+0x1a0/0x3b8=0A= [ 575.806120][T28650] qdisc_create_dflt+0xc8/0x748=0A= [ 575.811321][T28643] get_swap_device: Bad swap file entry 58025a5a5a5a5a5= a=0A= [ 575.815788][T28650] dev_activate+0x488/0x8b8=0A= [ 575.815806][T28650] __dev_open+0x240/0x360=0A= [ 575.820848][T28643] get_swap_device: Bad swap file entry 58025a5a5a5a5a5= a=0A= [ 575.827542][T28650] __dev_change_flags+0x344/0x480=0A= [ 575.827553][T28650] dev_change_flags+0x74/0x140=0A= [ 575.906574][T28650] do_setlink+0x7c8/0x2760=0A= [ 575.910856][T28650] __rtnl_newlink+0x80c/0x1000=0A= [ 575.915481][T28650] rtnl_newlink+0x68/0xa0=0A= [ 575.919671][T28650] rtnetlink_rcv_msg+0x394/0xa48=0A= [ 575.924477][T28650] netlink_rcv_skb+0x19c/0x340=0A= [ 575.929103][T28650] rtnetlink_rcv+0x14/0x20=0A= [ 575.933380][T28650] netlink_unicast+0x3ec/0x5e0=0A= [ 575.938005][T28650] netlink_sendmsg+0x63c/0xa60=0A= [ 575.942632][T28650] ____sys_sendmsg+0x5b0/0x740=0A= [ 575.947261][T28650] ___sys_sendmsg+0xec/0x160=0A= [ 575.949053][T28716] futex_wake_op: trinity-c158 tries to shift op by -1;= fix this program=0A= [ 575.951712][T28650] __sys_sendmsg+0xb8/0x130=0A= [ 575.951727][T28650] __arm64_sys_sendmsg+0x6c/0x98=0A= [ 575.969052][T28650] do_el0_svc+0x124/0x228=0A= [ 575.973248][T28650] el0_sync_handler+0x260/0x410=0A= [ 575.977959][T28650] el0_sync+0x140/0x180=0A= [ 575.981974][T28650] Last call_rcu():=0A= [ 575.985557][T28650] kasan_save_stack+0x24/0x50=0A= [ 575.990099][T28650] kasan_record_aux_stack+0xe0/0x110=0A= [ 575.995249][T28650] call_rcu+0x114/0x680=0A= [ 575.999273][T28650] put_object+0x84/0xc0=0A= [ 576.003303][T28650] __delete_object+0xc4/0x110=0A= [ 576.007848][T28650] delete_object_full+0x18/0x20=0A= [ 576.012565][T28650] kmemleak_free+0x2c/0x38=0A= [ 576.016844][T28650] slab_free_freelist_hook+0x190/0x298=0A= [ 576.022158][T28650] kmem_cache_free+0x128/0x518=0A= [ 576.026775][T28650] file_free_rcu+0x68/0xb0=0A= [ 576.031045][T28650] rcu_core+0x8b8/0xf90=0A= [ 576.035059][T28650] rcu_core_si+0xc/0x18=0A= [ 576.039079][T28650] efi_header_end+0x358/0x14d4=0A= [ 576.043712][T28650] Second to last call_rcu():=0A= [ 576.048176][T28650] kasan_save_stack+0x24/0x50=0A= [ 576.052723][T28650] kasan_record_aux_stack+0xe0/0x110=0A= [ 576.057871][T28650] call_rcu+0x114/0x680=0A= [ 576.057998][T28976] get_swap_device: Bad swap file entry 58025a5a5a5a5a5= a=0A= [ 576.061888][T28650] put_object+0x84/0xc0=0A= [ 576.061898][T28650] __delete_object+0xc4/0x110=0A= [ 576.061906][T28650] delete_object_full+0x18/0x20=0A= [ 576.061917][T28650] kmemleak_free+0x2c/0x38=0A= [ 576.061925][T28650] slab_free_freelist_hook+0x190/0x298=0A= [ 576.061933][T28650] kmem_cache_free+0x128/0x518=0A= [ 576.061950][T28650] putname+0xb8/0x108=0A= [ 576.065453][T28678] get_swap_device: Bad swap file entry 58025a5a5a5a5a5= a=0A= [ 576.065462][T28678] get_swap_device: Bad swap file entry 58025a5a5a5a5a5= a=0A= [ 576.065470][T28678] get_swap_device: Bad swap file entry 58025a5a5a5a5a5= a=0A= [ 576.068777][T28976] get_swap_device: Bad swap file entry 58025a5a5a5a5a5= a=0A= [ 576.072740][T28650] do_sys_openat2+0x26c/0x4c0=0A= [ 576.072753][T28650] do_sys_open+0xa4/0xf8=0A= [ 576.077404][T28976] get_swap_device: Bad swap file entry 58025a5a5a5a5a5= a=0A= [ 576.082097][T28650] __arm64_sys_openat+0x88/0xc8=0A= [ 576.082107][T+0x260/0x410=0A= [ 6.082138][T28650s to the cache kted 336 bytes to 576.082157][T28ntry 5802= 5a5a5a5a5a5a=0A= [ 576.120513][T28650] page:00000000e119790b refcount:1 mapcount:0 mapping:= 0000000000000000 index:0x0 pfn:0x8a2603=0A= [ 576.127826][T28675] get_swap_device: Bad swap file entry 58025a5a5a5a5a5= a=0A= [ 576.131821][T28650] flags: 0x7ffff800000200(slab)=0A= [ 576.131835][T28650] raw: 007ffff800000200 ffffffe0223a3908 ffffffe02234c= 948 ffff000000322480=0A= [ 576.131845][T28650] raw: 0000000000000000 00000000005b005b 00000001fffff= fff 0000000000000000=0A= [ 576.131853][T28650] page dumped because: kasan: bad access detected=0A= [ 576.131865][T28650] Memory state around the buggy address:=0A= [ 576.131875][T28650] ffff0089a603fe80: 00 00 00 fc fc fc fc fc fc fc fc = fc fc fc fc fc=0A= [ 576.131884][T28650] ffff0089a603ff00: fc fc fc fc fc fc fc fc fc fc fc = fc fc fc fc fc=0A= [ 576.131894][T28650] >ffff0089a603ff80: fc fc fc fc fc fc fc fc fc fc fc = fc fc fc fc fc=0A= [ 576.131900][T28650] = ^=0A= [ 576.131908][T28650] ffff0089a6040000: 00 00 00 00 00 00 00 00 00 00 00 = 00 00 00 00 00=0A= [ 576.131917][T28650] ffff0089a6040080: 00 00 00 00 00 00 00 00 00 00 00 = 00 00 00 00 00=0A= [ 576.131923][T28650] =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=0A= [ 576.131928][T28650] Disabling lock debugging due to kernel taint=0A= [ 576.132028][T28650] get_swap_device: Bad swap file entry 58025a5a5a5a5a5= a=0A= [ 576.132038][T28650] get_swap_device: Bad swap file entry 58025a5a5a5a5a5= a=0A= [ 576.132046][T28650] get_swap_device: Bad swap file entry 58025a5a5a5a5a5= a=0A= [ 576.281114][T28912] get_swap_device: Bad swap file entry 58025a5a5a5a5a5= a=0A= [ 576.286297][T28675] get_swap_device: Bad swap file entry 58025a5a5a5a5a5= a=0A= [ 576.293442][T28912] get_swap_device: Bad swap file entry 58025a5a5a5a5a5= a=0A= [ 576.293451][T28912] get_swap_device: Bad swap file entry 58025a5a5a5a5a5= a=0A= =0A= > From b6cad43ad3cf63d73e539e3eaadd4ec9d2744dc6 Mon Sep 17 00:00:00 2001=0A= > From: Huang Ying =0A= > Date: Fri, 10 Jul 2020 17:27:45 +0800=0A= > Subject: [PATCH] dbg: Fix a logic hole in swap_ra_info()=0A= >=0A= > ---=0A= > mm/swap_state.c | 5 ++---=0A= > 1 file changed, 2 insertions(+), 3 deletions(-)=0A= >=0A= > diff --git a/mm/swap_state.c b/mm/swap_state.c=0A= > index 05889e8e3c97..8481c15829b2 100644=0A= > --- a/mm/swap_state.c=0A= > +++ b/mm/swap_state.c=0A= > @@ -669,12 +669,11 @@ static void swap_ra_info(struct vm_fault *vmf,=0A= > pte_t *tpte;=0A= > #endif=0A= >=0A= > + ra_info->win =3D 1;=0A= > max_win =3D 1 << min_t(unsigned int, READ_ONCE(page_cluster),=0A= > SWAP_RA_ORDER_CEILING);=0A= > - if (max_win =3D=3D 1) {=0A= > - ra_info->win =3D 1;=0A= > + if (max_win =3D=3D 1)=0A= > return;=0A= > - }=0A= >=0A= > faddr =3D vmf->address;=0A= > orig_pte =3D pte =3D pte_offset_map(vmf->pmd, faddr);=0A= > --=0A= > 2.27.0=0A= >=0A= =0A= --_002_CA2E3DE2DD06CA4FA11644750E4E292F454E3B6DSHSMSX104ccrcor_ Content-Type: text/x-patch; name="0001-dbg-dump-upon-abnormal-pte-values.patch" Content-Description: 0001-dbg-dump-upon-abnormal-pte-values.patch Content-Disposition: attachment; filename="0001-dbg-dump-upon-abnormal-pte-values.patch"; size=1029; creation-date="Mon, 20 Jul 2020 03:32:53 GMT"; modification-date="Mon, 20 Jul 2020 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