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 X-Spam-Level: X-Spam-Status: No, score=-0.7 required=3.0 tests=FROM_LOCAL_HEX, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 00399C282CE for ; Tue, 4 Jun 2019 21:19:07 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id A5CDA2070B for ; Tue, 4 Jun 2019 21:19:07 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org A5CDA2070B Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 2A7736B0271; Tue, 4 Jun 2019 17:19:07 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 257DC6B0273; Tue, 4 Jun 2019 17:19:07 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 146CC6B0274; Tue, 4 Jun 2019 17:19:07 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from mail-it1-f200.google.com (mail-it1-f200.google.com [209.85.166.200]) by kanga.kvack.org (Postfix) with ESMTP id E92FF6B0271 for ; Tue, 4 Jun 2019 17:19:06 -0400 (EDT) Received: by mail-it1-f200.google.com with SMTP id h133so144019ith.9 for ; Tue, 04 Jun 2019 14:19:06 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-original-authentication-results:x-gm-message-state:mime-version :date:in-reply-to:message-id:subject:from:to; bh=0iJ/CisaeAFt6kjSxf0PDnzBYqaLMd8GZ6ICt72+F8c=; b=ABeja2Jvn0ZpGA+O698MaQcvJssUoIVNZs75v/aPrymOOZq22Ywg1EG+Uj9zpxCfrV Ak5DVGvmWy6VknujRt+kdz8CKurwZgRsJWr/SjTmuhgVsQUFFWY86h7MSBROJSP6DzPm +fFKqMwpFGvRJR5RDyChNxyDTPA8pxLzcBEeW6xmumUqeXCrGeT8Ao5tPR2tN6Ya3hVb TinegIEgxIZO7ojidm+c86YV+lr9yZ/V2VhJB8u6PXn1pixyD+l57Ky9h3n9agNl02Za Sa5tOUG/nwVq9SmcgbRX+dW5el+7ffU+No4RcJMUxbZDu5pBZlsc9FY+fULw/iaF9ab1 OsPw== X-Original-Authentication-Results: mx.google.com; spf=pass (google.com: domain of 3sed2xakbanigmn8y992fydd61.4cc492ig2f0cbh2bh.0ca@m3kw2wvrgufz5godrsrytgd7.apphosting.bounces.google.com designates 209.85.220.69 as permitted sender) smtp.mailfrom=3SeD2XAkbANIGMN8y992FyDD61.4CC492IG2F0CBH2BH.0CA@M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=appspotmail.com X-Gm-Message-State: APjAAAXpSvQ7uYLGQTclo080UPlVcBXODklMpMLpsiisT1HJD7GHr1I4 LIkHUwt8D9awe03qXJ8XDrEZgBLFVaku/nTz/kZ5XpLxkDGFixEVmlZRYKzYDs+FglVWPzCTWmc FWgJkvZnKeNsdiJ4OlHyNmhwpaan4su1vf8Ve67g5JYJmVPX2IEDTy6tQ/hpswIY= X-Received: by 2002:a6b:c9d8:: with SMTP id z207mr20092316iof.184.1559683146724; Tue, 04 Jun 2019 14:19:06 -0700 (PDT) X-Received: by 2002:a6b:c9d8:: with SMTP id z207mr20092274iof.184.1559683145860; Tue, 04 Jun 2019 14:19:05 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1559683145; cv=none; d=google.com; s=arc-20160816; b=dmNvaHRvhJRuzL5zyGWsbc6k3oEXhIAsgtNDIcnC82uVQjt9OSzuzFi428pKv5zZON ogxQzKmjSJKgVHeFvjGBJgVdfXJ/hC22U4jxDhMF+C0NYd/i0c6QcqynusrRGaa48dEJ wD2IxCs8cMR6R1L2LkRRSOQRqVYZO10EC1zL3zF4q+6PEr9dtB6ll1aegpg7mbWWNSwh /oNqMgk3CyGjOOyO/vuxPtw6DD0FSga9ibeJ6QWbJS0jMzz9D+Jwdnm7JdG/yPO6Ffa3 lBB7+xOMcnf2OecS9otOX6aLcBDHMJ/5iakv1T/6jfuwX6a/1g2PHLOWHG6MdyLFfNyd 9neg== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=to:from:subject:message-id:in-reply-to:date:mime-version; bh=0iJ/CisaeAFt6kjSxf0PDnzBYqaLMd8GZ6ICt72+F8c=; b=jNBxGoQ3Zk7xndx0SOhr31EetTIJkxtyBoUNn224rPdMmPDSP9lXlUBSbgPalSRaRU x5r7ZOrxCsxx4ojpfZ2/EEwI4Fsl5/SI9pgBS0Fm0OKgxK8O8CCi5wNOapE1yZ5fkRr9 Lv0sOCvmKZOvvEYvZcVqgedPlbxWsI8W/G2UQbic6JaZZnpyKAK9IQiCV9mjTdwOpn/6 070G+TSjxthW4qPRVxsrZKQsuxwyyw3Yv6+ssZAOpirAIXO7jsUcTemx/bwo28tvE745 jMASGvEN9+rEhqVx1aWt4s/gyWHV9Aly++mu3PauyaP1e46A/PNj182OAEPjvoLvrCHp t/qw== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: domain of 3sed2xakbanigmn8y992fydd61.4cc492ig2f0cbh2bh.0ca@m3kw2wvrgufz5godrsrytgd7.apphosting.bounces.google.com designates 209.85.220.69 as permitted sender) smtp.mailfrom=3SeD2XAkbANIGMN8y992FyDD61.4CC492IG2F0CBH2BH.0CA@M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=appspotmail.com Received: from mail-sor-f69.google.com (mail-sor-f69.google.com. [209.85.220.69]) by mx.google.com with SMTPS id n1sor3308038iom.6.2019.06.04.14.19.05 for (Google Transport Security); Tue, 04 Jun 2019 14:19:05 -0700 (PDT) Received-SPF: pass (google.com: domain of 3sed2xakbanigmn8y992fydd61.4cc492ig2f0cbh2bh.0ca@m3kw2wvrgufz5godrsrytgd7.apphosting.bounces.google.com designates 209.85.220.69 as permitted sender) client-ip=209.85.220.69; Authentication-Results: mx.google.com; spf=pass (google.com: domain of 3sed2xakbanigmn8y992fydd61.4cc492ig2f0cbh2bh.0ca@m3kw2wvrgufz5godrsrytgd7.apphosting.bounces.google.com designates 209.85.220.69 as permitted sender) smtp.mailfrom=3SeD2XAkbANIGMN8y992FyDD61.4CC492IG2F0CBH2BH.0CA@M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=appspotmail.com X-Google-Smtp-Source: APXvYqww+IWWlnUeKm2m4DZKJtmvDhFfbtTotLDezLfaqhvRpapQUBIBo5TiP0EjNwhcIykXfggRbGqXtXWEOZsR5RvhIHP9g4NH MIME-Version: 1.0 X-Received: by 2002:a6b:6f0e:: with SMTP id k14mr22747234ioc.257.1559683145579; Tue, 04 Jun 2019 14:19:05 -0700 (PDT) Date: Tue, 04 Jun 2019 14:19:05 -0700 In-Reply-To: <000000000000543e45058a3cf40b@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000dac5a0058a860712@google.com> Subject: Re: possible deadlock in get_user_pages_unlocked (2) From: syzbot To: akpm@linux-foundation.org, aneesh.kumar@linux.ibm.com, dan.j.williams@intel.com, ira.weiny@intel.com, jhubbard@nvidia.com, keith.busch@intel.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, rppt@linux.ibm.com, sfr@canb.auug.org.au, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8"; format=flowed; delsp=yes X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: syzbot has found a reproducer for the following crash on: HEAD commit: 56b697c6 Add linux-next specific files for 20190604 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=13241716a00000 kernel config: https://syzkaller.appspot.com/x/.config?x=4248d6bc70076f7d dashboard link: https://syzkaller.appspot.com/bug?extid=e1374b2ec8f6a25ab2e5 compiler: gcc (GCC) 9.0.0 20181231 (experimental) syz repro: https://syzkaller.appspot.com/x/repro.syz?x=165757eea00000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=10dd3e86a00000 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+e1374b2ec8f6a25ab2e5@syzkaller.appspotmail.com IPVS: ftp: loaded support on port[0] = 21 ====================================================== WARNING: possible circular locking dependency detected 5.2.0-rc3-next-20190604 #8 Not tainted ------------------------------------------------------ syz-executor842/8767 is trying to acquire lock: 00000000badb3a6d (&mm->mmap_sem#2){++++}, at: get_user_pages_unlocked+0xfc/0x4a0 mm/gup.c:1174 but task is already holding lock: 0000000052562d44 (&sb->s_type->i_mutex_key#10){+.+.}, at: inode_trylock include/linux/fs.h:798 [inline] 0000000052562d44 (&sb->s_type->i_mutex_key#10){+.+.}, at: ext4_file_write_iter+0x246/0x1070 fs/ext4/file.c:232 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&sb->s_type->i_mutex_key#10){+.+.}: down_write+0x38/0xa0 kernel/locking/rwsem.c:66 inode_lock include/linux/fs.h:778 [inline] process_measurement+0x15ae/0x15e0 security/integrity/ima/ima_main.c:228 ima_file_mmap+0x11a/0x130 security/integrity/ima/ima_main.c:370 security_file_mprotect+0xd5/0x100 security/security.c:1426 do_mprotect_pkey+0x537/0xa30 mm/mprotect.c:550 __do_sys_mprotect mm/mprotect.c:582 [inline] __se_sys_mprotect mm/mprotect.c:579 [inline] __x64_sys_mprotect+0x78/0xb0 mm/mprotect.c:579 do_syscall_64+0xfd/0x680 arch/x86/entry/common.c:301 entry_SYSCALL_64_after_hwframe+0x49/0xbe -> #0 (&mm->mmap_sem#2){++++}: lock_acquire+0x16f/0x3f0 kernel/locking/lockdep.c:4300 down_read+0x3f/0x1e0 kernel/locking/rwsem.c:24 get_user_pages_unlocked+0xfc/0x4a0 mm/gup.c:1174 __gup_longterm_unlocked mm/gup.c:2193 [inline] get_user_pages_fast+0x43f/0x530 mm/gup.c:2245 iov_iter_get_pages+0x2c2/0xf80 lib/iov_iter.c:1287 dio_refill_pages fs/direct-io.c:171 [inline] dio_get_page fs/direct-io.c:215 [inline] do_direct_IO fs/direct-io.c:983 [inline] do_blockdev_direct_IO+0x3f7b/0x8e00 fs/direct-io.c:1336 __blockdev_direct_IO+0xa1/0xca fs/direct-io.c:1422 ext4_direct_IO_write fs/ext4/inode.c:3782 [inline] ext4_direct_IO+0xaa7/0x1bb0 fs/ext4/inode.c:3909 generic_file_direct_write+0x20a/0x4a0 mm/filemap.c:3110 __generic_file_write_iter+0x2ee/0x630 mm/filemap.c:3293 ext4_file_write_iter+0x332/0x1070 fs/ext4/file.c:266 call_write_iter include/linux/fs.h:1870 [inline] new_sync_write+0x4d3/0x770 fs/read_write.c:483 __vfs_write+0xe1/0x110 fs/read_write.c:496 vfs_write+0x268/0x5d0 fs/read_write.c:558 ksys_write+0x14f/0x290 fs/read_write.c:611 __do_sys_write fs/read_write.c:623 [inline] __se_sys_write fs/read_write.c:620 [inline] __x64_sys_write+0x73/0xb0 fs/read_write.c:620 do_syscall_64+0xfd/0x680 arch/x86/entry/common.c:301 entry_SYSCALL_64_after_hwframe+0x49/0xbe other info that might help us debug this: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&sb->s_type->i_mutex_key#10); lock(&mm->mmap_sem#2); lock(&sb->s_type->i_mutex_key#10); lock(&mm->mmap_sem#2); *** DEADLOCK *** 2 locks held by syz-executor842/8767: #0: 0000000065e8e19a (sb_writers#3){.+.+}, at: file_start_write include/linux/fs.h:2836 [inline] #0: 0000000065e8e19a (sb_writers#3){.+.+}, at: vfs_write+0x485/0x5d0 fs/read_write.c:557 #1: 0000000052562d44 (&sb->s_type->i_mutex_key#10){+.+.}, at: inode_trylock include/linux/fs.h:798 [inline] #1: 0000000052562d44 (&sb->s_type->i_mutex_key#10){+.+.}, at: ext4_file_write_iter+0x246/0x1070 fs/ext4/file.c:232 stack backtrace: CPU: 0 PID: 8767 Comm: syz-executor842 Not tainted 5.2.0-rc3-next-20190604 #8 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x172/0x1f0 lib/dump_stack.c:113 print_circular_bug.cold+0x1cc/0x28f kernel/locking/lockdep.c:1566 check_prev_add kernel/locking/lockdep.c:2311 [inline] check_prevs_add kernel/locking/lockdep.c:2419 [inline] validate_chain kernel/locking/lockdep.c:2801 [inline] __lock_acquire+0x3755/0x5490 kernel/locking/lockdep.c:3790 lock_acquire+0x16f/0x3f0 kernel/locking/lockdep.c:4300 down_read+0x3f/0x1e0 kernel/locking/rwsem.c:24 get_user_pages_unlocked+0xfc/0x4a0 mm/gup.c:1174 __gup_longterm_unlocked mm/gup.c:2193 [inline] get_user_pages_fast+0x43f/0x530 mm/gup.c:2245 iov_iter_get_pages+0x2c2/0xf80 lib/iov_iter.c:1287 dio_refill_pages fs/direct-io.c:171 [inline] dio_get_page fs/direct-io.c:215 [inline] do_direct_IO fs/direct-io.c:983 [inline] do_blockdev_direct_IO+0x3f7b/0x8e00 fs/direct-io.c:1336 ? 0xffffffff81000000 __blockdev_direct_IO+0xa1/0xca fs/direct-io.c:1422 ext4_direct_IO_write fs/ext4/inode.c:3782 [inline] ext4_direct_IO+0xaa7/0x1bb0 fs/ext4/inode.c:3909 generic_file_direct_write+0x20a/0x4a0 mm/filemap.c:3110 __generic_file_write_iter+0x2ee/0x630 mm/filemap.c:3293 ext4_file_write_iter+0x332/0x1070 fs/ext4/file.c:266 call_write_iter include/linux/fs.h:1870 [inline] new_sync_write+0x4d3/0x770 fs/read_write.c:483 __vfs_write+0xe1/0x110 fs/read_write.c:496 vfs_write+0x268/0x5d0 fs/read_write.c:558 ksys_write+0x14f/0x290 fs/read_write.c:611 __do_sys_write fs/read_write.c:623 [inline] __se_sys_write fs/read_write.c:620 [inline] __x64_sys_write+0x73/0xb0 fs/read_write.c:620 do_syscall_64+0xfd/0x680 arch/x86/entry/common.c:301 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x440a49 Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 bb 10 fc ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007ffc18e28968 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00000000004a22e0 RCX: 0000000000440a49 RDX: 0000000020000012 RSI: 0000000020000000 RDI: 0000000000000005 RBP: 00000000004a2370 R08: 0000000000000012 R09: 0000000000000100 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000401f90 R13: 0000000000402020 R14: 0000000000000000 R15: 0000000000000000