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=-9.0 required=3.0 tests=BAYES_00,FROM_LOCAL_HEX, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED 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 2C0ABC433DF for ; Mon, 10 Aug 2020 15:46:27 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 0A3532078E for ; Mon, 10 Aug 2020 15:46:27 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727794AbgHJPq0 (ORCPT ); Mon, 10 Aug 2020 11:46:26 -0400 Received: from mail-io1-f72.google.com ([209.85.166.72]:36840 "EHLO mail-io1-f72.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727790AbgHJPqZ (ORCPT ); Mon, 10 Aug 2020 11:46:25 -0400 Received: by mail-io1-f72.google.com with SMTP id h205so7357340iof.3 for ; Mon, 10 Aug 2020 08:46:25 -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=SHAexMyW7z201Yxw9hnQ8uPlGiip1/BeDLnLE7U9rJo=; b=Tii5Xr5CZhfhWQgYLnYr2WZFjuRLirzPYd+wSX3wDlmsh2srcegiBEmfUeZ0Fl9kN+ DlOzub60RIUOn0MACJBLAiYDsD5xfd0xSqwlAipboIJlA+rv+L8LbHjt5OKnumHQQs7Z 7G5lFNNeNJHARXRqmJHC2wyfhRMNTsVXGh2R2hrRKYKOjWvi/pNzgaZGKAXJE/3If05e NdVIxpGNXf4x4mXTsJANmSidlv8GKMfp9EhtUJITYRePN1ZZrZPKy37N5ldi4SY+7mF/ nx8+Q4cwKmONPvkI+5Y1qxTKmPyHShGG+V/6AvmNq9f6usERB2BeRE/DeUblN04jnBAn nhYw== X-Gm-Message-State: AOAM531YXbfwa0FI56iqdJoMTZ8EduoCTMKWCN2iufLzj8IaMmTsTL+t 94dcBxI7DMgpzx/ia0jHmtZm6vIiGewVVN5De9u2eUl2vBnP X-Google-Smtp-Source: ABdhPJwp+HLP3iQxO3liiiRpmTkJSrG5YWUlMOGePiAkgtJDyFSg+uttF8UMfBG3ecCN/S84Pv15S0aZzzwuNWMJOAckDOjPiSjG MIME-Version: 1.0 X-Received: by 2002:a92:d9d1:: with SMTP id n17mr17253665ilq.182.1597074385031; Mon, 10 Aug 2020 08:46:25 -0700 (PDT) Date: Mon, 10 Aug 2020 08:46:25 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <00000000000066583105ac87dbf4@google.com> Subject: BUG: unable to handle kernel NULL pointer dereference in loop_rw_iter From: syzbot To: axboe@kernel.dk, io-uring@vger.kernel.org, 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" Sender: io-uring-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: io-uring@vger.kernel.org Hello, syzbot found the following issue on: HEAD commit: 9420f1ce Merge tag 'pinctrl-v5.9-1' of git://git.kernel.or.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=13662f62900000 kernel config: https://syzkaller.appspot.com/x/.config?x=72cf85e4237850c8 dashboard link: https://syzkaller.appspot.com/bug?extid=1abbd16e49910f6bbe45 compiler: gcc (GCC) 10.1.0-syz 20200507 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=15929006900000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=15e196aa900000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+1abbd16e49910f6bbe45@syzkaller.appspotmail.com BUG: kernel NULL pointer dereference, address: 0000000000000000 #PF: supervisor instruction fetch in kernel mode #PF: error_code(0x0010) - not-present page PGD a652e067 P4D a652e067 PUD a652f067 PMD 0 Oops: 0010 [#1] PREEMPT SMP KASAN CPU: 1 PID: 7461 Comm: io_wqe_worker-0 Not tainted 5.8.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:0x0 Code: Bad RIP value. RSP: 0018:ffffc9000804f910 EFLAGS: 00010246 RAX: 1ffffffff10b0b9b RBX: dffffc0000000000 RCX: ffff88808962e1c8 RDX: 000000000000003c RSI: 0000000020000740 RDI: ffff88809fb2dcc0 RBP: 0000000020000740 R08: ffffc9000804fa28 R09: ffff8880a7639c0f R10: 0000000000000000 R11: 0000000000000000 R12: ffffc9000804fa28 R13: ffffffff88585cc0 R14: 000000000000003c R15: 0000000000000001 FS: 0000000000000000(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffffffffd6 CR3: 000000008e2a7000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: loop_rw_iter.part.0+0x26e/0x450 fs/io_uring.c:2850 loop_rw_iter fs/io_uring.c:2829 [inline] io_write+0x6a2/0x7a0 fs/io_uring.c:3190 io_issue_sqe+0x1b0/0x60d0 fs/io_uring.c:5530 io_wq_submit_work+0x183/0x3d0 fs/io_uring.c:5775 io_worker_handle_work+0xa45/0x13f0 fs/io-wq.c:527 io_wqe_worker+0xbf0/0x10e0 fs/io-wq.c:569 kthread+0x3b5/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 Modules linked in: CR2: 0000000000000000 ---[ end trace 97e511c5a98da2fe ]--- RIP: 0010:0x0 Code: Bad RIP value. RSP: 0018:ffffc9000804f910 EFLAGS: 00010246 RAX: 1ffffffff10b0b9b RBX: dffffc0000000000 RCX: ffff88808962e1c8 RDX: 000000000000003c RSI: 0000000020000740 RDI: ffff88809fb2dcc0 RBP: 0000000020000740 R08: ffffc9000804fa28 R09: ffff8880a7639c0f R10: 0000000000000000 R11: 0000000000000000 R12: ffffc9000804fa28 R13: ffffffff88585cc0 R14: 000000000000003c R15: 0000000000000001 FS: 0000000000000000(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f84c3b15028 CR3: 000000008e2a7000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 --- This report 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 issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. syzbot can test patches for this issue, for details see: https://goo.gl/tpsmEJ#testing-patches