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=-0.4 required=3.0 tests=FROM_LOCAL_HEX, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED autolearn=no 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 DCA19CA9EBD for ; Fri, 25 Oct 2019 11:51:13 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id BDFE221D7B for ; Fri, 25 Oct 2019 11:51:13 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2393548AbfJYLvM (ORCPT ); Fri, 25 Oct 2019 07:51:12 -0400 Received: from mail-io1-f72.google.com ([209.85.166.72]:56499 "EHLO mail-io1-f72.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726463AbfJYLvL (ORCPT ); Fri, 25 Oct 2019 07:51:11 -0400 Received: by mail-io1-f72.google.com with SMTP id a22so1455967ioq.23 for ; Fri, 25 Oct 2019 04:51:09 -0700 (PDT) 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=GCYuTfVSSG8sj2mz/8sBF97BcpApt0s2WcNDvXp5Rdc=; b=Nw/VgZW4i3VTF/B64vU0uwwxnY2os/xfaP0zqDB6Xc3ZPmYZ1KMTUgWcvuaF/ubUQL hLSSXxS5G4URxahaEyWiCdZuHc5zrVwaO2smopscJc2lt9F6vbFRx9uWblbWawbdfHyy yIwcsFMjRCX+kE84FFR5/ONPZ1h5BJn+QHiZVYF8lR06ImGyEsL40RLn+05JoY6Bmvgg ng9Ujdr+Ps/Xyl3QRL3qvoyrVImTTyXXn8L8Qu8c78wnJEbOSq1KikrMwNc4p74DOfGS 1v4l7F5ARQoCFwPM2UzbREk1aWuIM6OptzV1aEMRlraEAeSNq1kzIPvgcWv5l1MXUt5q D7ig== X-Gm-Message-State: APjAAAWx23kgjCFbHhLI7fr2409OEJt0uMZ2dhiEK6EL21WNNpnSGHUE XjlFiS4x9tCqXHeX0ToQ1wIe8bAw/Vncn0FlgFoJqEo2RmxY X-Google-Smtp-Source: APXvYqzi/Tq9tGi61conwDmSuuhTnjfKda+BVSQOBrtGtekXzYN1GkXl7rH3BUyOB+Lfpg3b30IwlpSKdF3RBgWrpzeQAVPYjyPu MIME-Version: 1.0 X-Received: by 2002:a02:ba8d:: with SMTP id g13mr3313659jao.93.1572004268056; Fri, 25 Oct 2019 04:51:08 -0700 (PDT) Date: Fri, 25 Oct 2019 04:51:08 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000fbbe1e0595bac322@google.com> Subject: KASAN: null-ptr-deref Write in io_wq_cancel_all From: syzbot To: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com, viro@zeniv.linux.org.uk Content-Type: text/plain; charset="UTF-8"; format=flowed; delsp=yes Sender: linux-fsdevel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org Hello, syzbot found the following crash on: HEAD commit: 139c2d13 Add linux-next specific files for 20191025 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=17ab5a70e00000 kernel config: https://syzkaller.appspot.com/x/.config?x=28fd7a693df38d29 dashboard link: https://syzkaller.appspot.com/bug?extid=d958a65633ea70280b23 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+d958a65633ea70280b23@syzkaller.appspotmail.com ================================================================== BUG: KASAN: null-ptr-deref in set_bit include/asm-generic/bitops-instrumented.h:28 [inline] BUG: KASAN: null-ptr-deref in io_wq_cancel_all+0x28/0x2a0 fs/io-wq.c:574 Write of size 8 at addr 0000000000000004 by task syz-executor.5/17477 CPU: 1 PID: 17477 Comm: syz-executor.5 Not tainted 5.4.0-rc4-next-20191025 #0 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 __kasan_report.cold+0x5/0x41 mm/kasan/report.c:510 kasan_report+0x12/0x20 mm/kasan/common.c:634 check_memory_region_inline mm/kasan/generic.c:185 [inline] check_memory_region+0x134/0x1a0 mm/kasan/generic.c:192 __kasan_check_write+0x14/0x20 mm/kasan/common.c:98 set_bit include/asm-generic/bitops-instrumented.h:28 [inline] io_wq_cancel_all+0x28/0x2a0 fs/io-wq.c:574 io_ring_ctx_wait_and_kill+0x1e2/0x710 fs/io_uring.c:3679 io_uring_release+0x42/0x50 fs/io_uring.c:3691 __fput+0x2ff/0x890 fs/file_table.c:280 ____fput+0x16/0x20 fs/file_table.c:313 task_work_run+0x145/0x1c0 kernel/task_work.c:113 exit_task_work include/linux/task_work.h:22 [inline] do_exit+0x904/0x2e60 kernel/exit.c:817 do_group_exit+0x135/0x360 kernel/exit.c:921 get_signal+0x47c/0x24f0 kernel/signal.c:2734 do_signal+0x87/0x1700 arch/x86/kernel/signal.c:815 exit_to_usermode_loop+0x286/0x380 arch/x86/entry/common.c:159 prepare_exit_to_usermode arch/x86/entry/common.c:194 [inline] syscall_return_slowpath arch/x86/entry/common.c:274 [inline] do_syscall_64+0x65f/0x760 arch/x86/entry/common.c:300 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x459ef9 Code: ad b6 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 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f7129716c78 EFLAGS: 00000246 ORIG_RAX: 00000000000001a9 RAX: 0000000000000005 RBX: 0000000000000002 RCX: 0000000000459ef9 RDX: 0000000000000000 RSI: 0000000020000080 RDI: 0000000000000ebf RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f71297176d4 R13: 00000000004c14ae R14: 00000000004d4c68 R15: 00000000ffffffff ================================================================== --- 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#status for how to communicate with syzbot.