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=-5.7 required=3.0 tests=FROM_LOCAL_HEX, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING, 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 C0084C43381 for ; Thu, 21 Feb 2019 14:54:06 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 870AA20700 for ; Thu, 21 Feb 2019 14:54:06 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728082AbfBUOyE (ORCPT ); Thu, 21 Feb 2019 09:54:04 -0500 Received: from mail-io1-f70.google.com ([209.85.166.70]:42365 "EHLO mail-io1-f70.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726969AbfBUOyE (ORCPT ); Thu, 21 Feb 2019 09:54:04 -0500 Received: by mail-io1-f70.google.com with SMTP id f10so1581880ioj.9 for ; Thu, 21 Feb 2019 06:54:03 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:date:message-id:subject:from:to; bh=7Mfsl0pOD7hijo3ZX4ghJMDojQUtTjQ9H7NHgnJ1oy4=; b=ZmdYRqpQ8NOeDRfhjMf+7iLPfh1QE7vzokG3lAaW+bv6mmqQswEbjXk91x5ZxysOg3 Ao2cqn4gAg4wPQEk0tP+HCKP6U2Jcp93AXw4qcdhXyhCHiS6L0J4fsjQGFECIgeihDRg 8rbzi1eMh1JFFiO+XwlHqcALzW9IwYxZCc8CIZR8fjnmNhbfbMc9b1EHv8q3Dh3XExW/ wjGGQsDBhaHSUDPrXX+GFNwPSHARJkUeuZp1ILCP3If9Q9p918BGwtZu10xoufy7m0qY TY5uC2URizxMaEe7DgpezP/+rTsZFWSCiCQL8Lfyi/dyQA9w69Wm73/AwJJBdsgovNgM tzoQ== X-Gm-Message-State: AHQUAua0Z+LqWNVNvOfaqky7OfVi2ZLltLvEDMD25Vxz3lH6wm7YQehL ilpsEjEvHVDVu4ey8i9HQVM316uVlCq+qtPUMR0VW2hrZZiD X-Google-Smtp-Source: AHgI3IaG2GGb/XtG97Xtk1Ic9BdhhWzHcYhhzZkGYIZrgyL23DgzHb3F5T32OW1fEWOiMi+RFdhdYEUKpUpP7+bRnG9GoHU0HDsC MIME-Version: 1.0 X-Received: by 2002:a5d:8b47:: with SMTP id c7mr1864621iot.21.1550760843370; Thu, 21 Feb 2019 06:54:03 -0800 (PST) Date: Thu, 21 Feb 2019 06:54:03 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000336578058268a553@google.com> Subject: general protection fault in relay_switch_subbuf From: syzbot To: akpm@linux-foundation.org, ebiggers@google.com, jrdr.linux@gmail.com, keescook@chromium.org, linux-kernel@vger.kernel.org, rientjes@google.com, syzkaller-bugs@googlegroups.com, willy@infradead.org Content-Type: text/plain; charset="UTF-8"; format=flowed; delsp=yes Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello, syzbot found the following crash on: HEAD commit: c04e2a780caf Merge tag 'fsnotify_for_v5.0-rc4' of git://gi.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=133424c0c00000 kernel config: https://syzkaller.appspot.com/x/.config?x=505743eba4e4f68 dashboard link: https://syzkaller.appspot.com/bug?extid=8e789999f280ccd6930f compiler: gcc (GCC) 9.0.0 20181231 (experimental) Unfortunately, I don't have any reproducer for this crash yet. IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+8e789999f280ccd6930f@syzkaller.appspotmail.com kasan: GPF could be caused by NULL-ptr deref or user memory access general protection fault: 0000 [#1] PREEMPT SMP KASAN CPU: 1 PID: 11600 Comm: syz-executor2 Not tainted 5.0.0-rc3+ #42 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:relay_switch_subbuf+0x27a/0xad0 kernel/relay.c:753 Code: 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 e2 07 00 00 48 b8 00 00 00 00 00 fc ff df 48 8b 4b 58 48 8d 79 50 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 c9 07 00 00 48 ba 00 00 00 00 00 fc ff df 49 8b RSP: 0018:ffff88805e3ef790 EFLAGS: 00010206 RAX: dffffc0000000000 RBX: ffff88804bc7db40 RCX: 0000000000000000 RDX: 000000000000000a RSI: ffffffff8182d552 RDI: 0000000000000050 RBP: ffff88805e3ef850 R08: ffff8880637f0600 R09: fffffbfff133b0b1 R10: ffff88805e3ef850 R11: ffffffff899d8587 R12: 0000000000000000 R13: ffff8880a7e05e00 R14: 0000000000000000 R15: 0000000000000000 FS: 00007f1fdbddd700(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000a50489 CR3: 00000000943a0000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: relay_flush kernel/relay.c:881 [inline] relay_flush+0x1c4/0x280 kernel/relay.c:865 __blk_trace_startstop.isra.0+0x28b/0x8b0 kernel/trace/blktrace.c:668 blk_trace_ioctl+0x1c6/0x300 kernel/trace/blktrace.c:727 blkdev_ioctl+0x141/0x2120 block/ioctl.c:591 block_ioctl+0xee/0x130 fs/block_dev.c:1914 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:509 [inline] do_vfs_ioctl+0x107b/0x17d0 fs/ioctl.c:696 ksys_ioctl+0xab/0xd0 fs/ioctl.c:713 __do_sys_ioctl fs/ioctl.c:720 [inline] __se_sys_ioctl fs/ioctl.c:718 [inline] __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:718 do_syscall_64+0x1a3/0x800 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x458099 Code: 6d b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 3b b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f1fdbddcc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000458099 RDX: 0000000000000000 RSI: 0000000000001275 RDI: 0000000000000005 RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f1fdbddd6d4 R13: 00000000004bf595 R14: 00000000004d0e88 R15: 00000000ffffffff Modules linked in: kobject: 'loop4' (000000005903bd4d): kobject_uevent_env kobject: 'loop4' (000000005903bd4d): fill_kobj_path: path = '/devices/virtual/block/loop4' ---[ end trace d4380d594e5099d1 ]--- RIP: 0010:relay_switch_subbuf+0x27a/0xad0 kernel/relay.c:753 Code: 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 e2 07 00 00 48 b8 00 00 00 00 00 fc ff df 48 8b 4b 58 48 8d 79 50 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 c9 07 00 00 48 ba 00 00 00 00 00 fc ff df 49 8b kobject: 'loop0' (0000000083b22ec7): kobject_uevent_env kobject: 'loop0' (0000000083b22ec7): fill_kobj_path: path = '/devices/virtual/block/loop0' Unknown ioctl 19304 kobject: 'loop3' (0000000050016e38): kobject_uevent_env RSP: 0018:ffff88805e3ef790 EFLAGS: 00010206 kobject: 'loop3' (0000000050016e38): fill_kobj_path: path = '/devices/virtual/block/loop3' RAX: dffffc0000000000 RBX: ffff88804bc7db40 RCX: 0000000000000000 kobject: 'loop1' (000000002962ffee): kobject_uevent_env kobject: 'loop1' (000000002962ffee): fill_kobj_path: path = '/devices/virtual/block/loop1' RDX: 000000000000000a RSI: ffffffff8182d552 RDI: 0000000000000050 kobject: 'loop4' (000000005903bd4d): kobject_uevent_env kobject: 'loop4' (000000005903bd4d): fill_kobj_path: path = '/devices/virtual/block/loop4' RBP: ffff88805e3ef850 R08: ffff8880637f0600 R09: fffffbfff133b0b1 kobject: 'loop4' (000000005903bd4d): kobject_uevent_env R10: ffff88805e3ef850 R11: ffffffff899d8587 R12: 0000000000000000 kobject: 'loop4' (000000005903bd4d): fill_kobj_path: path = '/devices/virtual/block/loop4' R13: ffff8880a7e05e00 R14: 0000000000000000 R15: 0000000000000000 FS: 00007f1fdbddd700(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000625208 CR3: 00000000943a0000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 --- This bug is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com. syzbot will keep track of this bug report. See: https://goo.gl/tpsmEJ#bug-status-tracking for how to communicate with syzbot.