Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751578AbdFGHVW (ORCPT ); Wed, 7 Jun 2017 03:21:22 -0400 Received: from mail-db5eur01on0092.outbound.protection.outlook.com ([104.47.2.92]:24011 "EHLO EUR01-DB5-obe.outbound.protection.outlook.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1751003AbdFGHVT (ORCPT ); Wed, 7 Jun 2017 03:21:19 -0400 Authentication-Results: vger.kernel.org; dkim=none (message not signed) header.d=none;vger.kernel.org; dmarc=none action=none header.from=nokia.com; From: Tommi Rantala Subject: 4.9.30 NULL pointer dereference in __remove_shared_vm_struct To: Andrew Morton , Andrea Arcangeli , "Kirill A. Shutemov" , Linux-MM , LKML Message-ID: <7244cb6d-ed7a-451a-1af9-885090173311@nokia.com> Date: Wed, 7 Jun 2017 10:21:11 +0300 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.1.0 MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit X-Originating-IP: [131.228.32.170] X-ClientProxiedBy: DB6PR0402CA0021.eurprd04.prod.outlook.com (2603:10a6:4:91::31) To DB6PR0701MB2358.eurprd07.prod.outlook.com (2603:10a6:4:60::12) X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DB6PR0701MB2358: X-MS-Office365-Filtering-Correlation-Id: 1d05dcd3-5502-4f27-df5c-08d4ad75c976 X-MS-Office365-Filtering-HT: Tenant X-Microsoft-Antispam: UriScan:;BCL:0;PCL:0;RULEID:(22001)(48565401081)(201703131423075)(201703031133081);SRVR:DB6PR0701MB2358; X-Microsoft-Exchange-Diagnostics: 1;DB6PR0701MB2358;3:kwXNt0Aw93CzLJ//LhoZ/3n93jh2XmAyoZpi0av9mqsxCi2ld+MzILFIEUkSl+AqSG7W5k1xVxnTRCquEzgpUHzCPcWgj+FJM1yjGjoNFXD1IiQT/2ttMcQ0p8P6eQ8svmEsvF0frK2bpo+q+8LUdkHxDC1nVAeF7ChQLKjhaDLvUV5Yat2DjPy8FoRW7GBqXKjwn9sXdzZ7cgAat5T+3+M2NwwO27q2JL//EwRzbPkqz+P13fkgp7ITq5RDJPGJK/T1agvxhelmNI0GowlxxvJeZ21nyJz9sUY3u52stH+znEz2SndYSp7tA7rv6gbreruiVqVuepTFsRZ2XlSd+WIJFx7IQHCmibOvDycGXsY=;25:JBRNrtlDm65sOT0KgL7VF7tN0WBB9KWAjmInfI983P+VUiC1eMOazsPl2fVQl9Lrq2IVGrndxkqrHToo8TEY+jWLX2CqhEgTlqE7X2nKTahDq7kXSoY9ENdnSpwARZhoZt2eGzjOIkcfOBNEZ5D3kXJLsn9RSWD9GJOKQ5OJBCBxpR6rdeNITP+E4l5TjA5UzSHMp350P53gSDgqG5ir0vEqIWUO9LC5o8iCwBpRBd2VQr/HH1qgRiCXawM2MDrXLKFqVwbXPTAXX7DPDEkIuR19C4n8JuedfXEIJ0nJ5qHUWNrgcuHRUGiZfky8W+O4IdbdlaycV2zRcbn+BTNtCkqSGOpKNM+/OAhMngQwF8ivvc/w71w2ysoDcouSnLz6S9NhowyMNyMfDNBSzns3FSIW0y2Z+fIxcfa+qxwLVlMblgTjxO7QBa7YjK7h5353ZDkei/w0YBg7dyvWHXeJ//S3KTbh4skh8OfudULWtAE= X-Microsoft-Exchange-Diagnostics: 1;DB6PR0701MB2358;31:LWslBMhrOWVgMDAyYHRF2MCVQTXLaQDDjtk7T1gWZvqrClXpUiHISBF6b6wIAxRatHOYRIGLen6dGd0BAKiyiXSfqd8IFVzmq6JjIABWS7lH6jJGXhn7lr6pf1EGqVqHnk9YG4pYlC0UekrFs9M9rJV09ICAStTONpEoe0fxBXQOki4KIB3biWhCOan7tN06Y7BaV7TucDg8DY/OvqUwd//+Cjlwcloyw4wNYNbnQz8f+2KoP1kbHFrRdOKVSTDm2P2cSjOWAszkntwXhRXBSg==;20: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 X-Microsoft-Antispam-PRVS: X-Exchange-Antispam-Report-Test: UriScan:; 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It's not easily reproducible. Perhaps I should enable some more debug options to see if they reveal anything... (note that I had different kernel builds, so the IP addresses are different in the logs below) $ scripts/faddr2line vmlinux __remove_shared_vm_struct+0x16/0x40 __remove_shared_vm_struct+0x16/0x40: atomic_inc at arch/x86/include/asm/atomic.h:91 (inlined by) __remove_shared_vm_struct at mm/mmap.c:137 (gdb) disassemble __remove_shared_vm_struct Dump of assembler code for function __remove_shared_vm_struct: 0xffffffff8218e7a0 <+0>: callq 0xffffffff825db650 <__fentry__> 0xffffffff8218e7a5 <+5>: mov 0x50(%rdi),%rax 0xffffffff8218e7a9 <+9>: push %rbp 0xffffffff8218e7aa <+10>: mov %rsp,%rbp 0xffffffff8218e7ad <+13>: test $0x8,%ah 0xffffffff8218e7b0 <+16>: je 0xffffffff8218e7c1 <__remove_shared_vm_struct+33> 0xffffffff8218e7b2 <+18>: mov 0x20(%rsi),%rax 0xffffffff8218e7b6 <+22>: lock incl 0x158(%rax) 0xffffffff8218e7bd <+29>: mov 0x50(%rdi),%rax 0xffffffff8218e7c1 <+33>: test $0x8,%al 0xffffffff8218e7c3 <+35>: je 0xffffffff8218e7c9 <__remove_shared_vm_struct+41> 0xffffffff8218e7c5 <+37>: lock decl 0x1c(%rdx) 0xffffffff8218e7c9 <+41>: lea 0x20(%rdx),%rsi 0xffffffff8218e7cd <+45>: callq 0xffffffff82183460 0xffffffff8218e7d2 <+50>: pop %rbp 0xffffffff8218e7d3 <+51>: retq [16076.230255] BUG: unable to handle kernel NULL pointer dereference at 0000000000000158 [16076.231566] IP: [] __remove_shared_vm_struct+0x16/0x40 [16076.232533] PGD 0 [16076.233125] Oops: 0002 [#1] SMP [16076.233631] Modules linked in: fuse tun bridge hmac 8021q garp stp llc2 af_key llc rds xfrm_user xfrm_algo nfnetlink dccp_ipv6 sctp libcrc32c dccp_ipv4 dccp iptable_filter ip_tables x_tables isofs ata_piix autofs4 [16076.236688] CPU: 10 PID: 10753 Comm: trinity-main Not tainted 4.9.30 #1 [16076.238917] task: ffff880285b58000 task.stack: ffffc90108d4c000 [16076.239741] RIP: 0010:[] [] __remove_shared_vm_struct+0x16/0x40 [16076.241085] RSP: 0018:ffffc90108d4fd38 EFLAGS: 00010202 [16076.241841] RAX: 0000000000000000 RBX: ffff8801568867e8 RCX: 0000000000000000 [16076.242807] RDX: ffff88032c7581d8 RSI: ffff88012af34a00 RDI: ffff8801568867e8 [16076.243773] RBP: ffffc90108d4fd38 R08: ffff880156886b80 R09: 00007fffcf5d4000 [16076.244737] R10: 0000000000000000 R11: 0000000000000001 R12: ffff88012af34a00 [16076.245698] R13: ffff88032c758200 R14: ffff88032c7581d8 R15: ffff8801568868a0 [16076.246659] FS: 0000000000000000(0000) GS:ffff880333480000(0000) knlGS:0000000000000000 [16076.247864] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [16076.248667] CR2: 0000000000000158 CR3: 0000000000c07000 CR4: 00000000000006e0 [16076.249634] DR0: 00007f54c4cae000 DR1: 00007ff1276c9000 DR2: 0000000000000000 [16076.250599] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 [16076.251563] Stack: [16076.251942] ffffc90108d4fd68 ffffffff8038ef91 ffff8801568867e8 0000000000400000 [16076.253139] 0000000000000000 ffffc90108d4fdc0 ffffc90108d4fda8 ffffffff80387893 [16076.254335] 0000000000000000 0000000000000000 ffff8801d1126c00 0000000000000000 [16076.255528] Call Trace: [16076.255959] [] unlink_file_vma+0x41/0x60 [16076.256746] [] free_pgtables+0x43/0x120 [16076.257520] [] exit_mmap+0xb2/0x150 [16076.258258] [] mmput+0x3b/0x100 [16076.258953] [] do_exit+0x255/0xb20 [16076.259673] [] ? syscall_trace_enter+0x1c1/0x2d0 [16076.260538] [] do_group_exit+0x43/0xb0 [16076.261303] [] SyS_exit_group+0x14/0x20 [16076.262078] [] do_syscall_64+0x7e/0x1a0 [16076.262852] [] entry_SYSCALL64_slow_path+0x25/0x25 [16076.263736] Code: 3d 00 20 00 00 48 0f 47 c2 48 89 05 cd dc 95 00 31 c0 c3 66 90 0f 1f 44 00 00 48 8b 47 50 55 48 89 e5 f6 c4 08 74 0f 48 8b 46 20 ff 80 58 01 00 00 48 8b 47 50 a8 08 74 04 f0 ff 4a 1c 48 8d [16076.267481] RIP [] __remove_shared_vm_struct+0x16/0x40 [16076.268424] RSP [16076.268973] CR2: 0000000000000158 [16076.269844] ---[ end trace 98a1bbd8d9e50234 ]--- [16076.270565] Fixing recursive fault but reboot is needed! [69086.066173] Out of memory: Kill process 2485 (trinity-c309) score 503 or sacrifice child [69086.067383] Killed process 2485 (trinity-c309) total-vm:73816kB, anon-rss:7196kB, file-rss:3940kB, shmem-rss:17248kB [69086.071158] oom_reaper: reaped process 2485 (trinity-c309), now anon-rss:0kB, file-rss:0kB, shmem-rss:17248kB [69089.763240] scsi_nl_rcv_msg: discarding partial skb [69093.568099] scsi_nl_rcv_msg: discarding partial skb [69095.925546] BUG: unable to handle kernel NULL pointer dereference at 0000000000000158 [69095.926875] IP: [] __remove_shared_vm_struct+0x16/0x40 [69095.927836] PGD 0 [69095.928411] Oops: 0002 [#1] SMP [69095.928934] Modules linked in: fuse tun 8021q xfrm_user garp dccp_ipv6 dccp_ipv4 dccp sctp bridge llc2 rds stp af_key llc xfrm_algo libcrc32c nfnetlink isofs iptable_filter ip_tables x_tables ata_piix autofs4 [69095.931931] CPU: 5 PID: 21391 Comm: trinity-c387 Not tainted 4.9.30 #1 [69095.934129] task: ffff88006a938000 task.stack: ffffc9007c624000 [69095.934944] RIP: 0010:[] [] __remove_shared_vm_struct+0x16/0x40 [69095.936276] RSP: 0018:ffffc9007c627b80 EFLAGS: 00010202 [69095.937027] RAX: 0000000000000000 RBX: ffff8801e0be4f18 RCX: 0000000000000000 [69095.937982] RDX: ffff88022dc6c658 RSI: ffff88018d16c600 RDI: ffff8801e0be4f18 [69095.938938] RBP: ffffc9007c627b80 R08: ffff880022c48508 R09: 00007fff63b80000 [69095.939893] R10: 0000000000000000 R11: 0000000000000001 R12: ffff88018d16c600 [69095.940844] R13: ffff88022dc6c680 R14: ffff88022dc6c658 R15: ffff8801e0be4000 [69095.941802] FS: 00007f5413555b40(0000) GS:ffff88023fd40000(0000) knlGS:0000000000000000 [69095.942993] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [69095.943791] CR2: 0000000000000158 CR3: 000000023f807000 CR4: 00000000000006e0 [69095.944747] DR0: 00007f5410a26000 DR1: 00007fa168c7d000 DR2: 00007f3d12f06000 [69095.945698] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 [69095.946653] Stack: [69095.947030] ffffc9007c627bb0 ffffffff8218f131 ffff8801e0be4f18 0000000000400000 [69095.948221] 0000000000000000 ffffc9007c627c08 ffffc9007c627bf0 ffffffff82187a33 [69095.949410] 0000000000000000 0000000000000000 ffff88013e944400 0000000000000000 [69095.950600] Call Trace: [69095.951029] [] unlink_file_vma+0x41/0x60 [69095.951813] [] free_pgtables+0x43/0x120 [69095.952578] [] exit_mmap+0xb2/0x150 [69095.953311] [] mmput+0x3b/0x100 [69095.954000] [] do_exit+0x255/0xb20 [69095.954715] [] do_group_exit+0x43/0xb0 [69095.955466] [] get_signal+0x29e/0x630 [69095.956216] [] do_signal+0x28/0x670 [69095.956942] [] ? handle_mm_fault+0x8af/0xce0 [69095.957756] [] ? __perf_sw_event+0x59/0x90 [69095.958548] [] ? __audit_syscall_exit+0x230/0x2c0 [69095.959410] [] exit_to_usermode_loop+0x80/0xc0 [69095.960243] [] do_syscall_64+0x145/0x1a0 [69095.961023] [] entry_SYSCALL64_slow_path+0x25/0x25 [69095.961894] Code: 3d 00 20 00 00 48 0f 47 c2 48 89 05 6d db 95 00 31 c0 c3 66 90 0f 1f 44 00 00 48 8b 47 50 55 48 89 e5 f6 c4 08 74 0f 48 8b 46 20 ff 80 58 01 00 00 48 8b 47 50 a8 08 74 04 f0 ff 4a 1c 48 8d [69095.965626] RIP [] __remove_shared_vm_struct+0x16/0x40 [69095.966555] RSP [69095.977590] CR2: 0000000000000158 [69095.978460] ---[ end trace fe244491d619cdbd ]--- [69095.979178] Fixing recursive fault but reboot is needed!