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=-8.7 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=unavailable 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 32607C433EF for ; Fri, 3 Sep 2021 20:28:39 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 1EB14610A2 for ; Fri, 3 Sep 2021 20:28:39 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1350629AbhICU3i (ORCPT ); Fri, 3 Sep 2021 16:29:38 -0400 Received: from mail-io1-f72.google.com ([209.85.166.72]:56001 "EHLO mail-io1-f72.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1350464AbhICU3X (ORCPT ); Fri, 3 Sep 2021 16:29:23 -0400 Received: by mail-io1-f72.google.com with SMTP id o128-20020a6bbe86000000b005bd06eaeca6so67707iof.22 for ; Fri, 03 Sep 2021 13:28:23 -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=e0G8oDxHDZq3PXhMJnp9n7DKn5qv2ZYzqyKdQ4nnIDI=; b=ScKw/7IXP8EQMT9E76dDq/+DQbvNoTbKVN8ytksratUeuoc1dYipW9R/+mlbZxSFNC 7e5cwzhzkJjITSVkmjpVXQw2XxYNejkqkrZBxQJVShHOPlMbiaxYf8frr8tC5I6FWPdQ CW3+RMF3RoezZNpX6Fuy+Wlc/uABYCCvug94o95ZnN0TumiLv4vSzYcBMcwAtiKK95yc 9XvvRc0l/iT0vMmRa9kKsUvVg27SP9MQWQdeyvSKdJ8mht7yV7kquYavgMYgnd78KtVp 0LjuDBg3ymnHo4yqY4zYzX5ykAMxDZ4O57Ksj4Kn9hll2JAAxdIxDh/+fff/vZylGvc6 zcOw== X-Gm-Message-State: AOAM530cEcZrQo2Sg6ozOwQZftHvVElqI8wbo1N4kbSysarO6xPBN8Jw nxJl+9VjKNCOb6aVCaeLCaKT8Gvn3WvQRhEo4hn8qlCg8TTD X-Google-Smtp-Source: ABdhPJwzC9vEcHrX60n3V8OZXRBboFSFbDwrhsCSmUAguBGEsttW+FHrcijlB8gXul2pjHUP8oFWJrmbC2+i6RBYWFR6FN6wqYto MIME-Version: 1.0 X-Received: by 2002:a05:6e02:1a6b:: with SMTP id w11mr520338ilv.69.1630700902893; Fri, 03 Sep 2021 13:28:22 -0700 (PDT) Date: Fri, 03 Sep 2021 13:28:22 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <0000000000000d4da305cb1d2467@google.com> Subject: [syzbot] BUG: unable to handle kernel NULL pointer dereference in kiocb_done From: syzbot To: asml.silence@gmail.com, axboe@kernel.dk, io-uring@vger.kernel.org, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello, syzbot found the following issue on: HEAD commit: 4ac6d90867a4 Merge tag 'docs-5.15' of git://git.lwn.net/li.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=13a275f5300000 kernel config: https://syzkaller.appspot.com/x/.config?x=3c3a5498e99259cf dashboard link: https://syzkaller.appspot.com/bug?extid=726f2ce6dbbf2ad8d133 compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.1 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=124a3b49300000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=142e610b300000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+726f2ce6dbbf2ad8d133@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 26f41067 P4D 26f41067 PUD 17c87067 PMD 0 Oops: 0010 [#1] PREEMPT SMP KASAN CPU: 1 PID: 8473 Comm: iou-wrk-8424 Not tainted 5.14.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:0x0 Code: Unable to access opcode bytes at RIP 0xffffffffffffffd6. RSP: 0018:ffffc900016af910 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff888036b6c000 RBP: ffff888036b6c000 R08: 0000000000000000 R09: ffff8880191787d7 R10: ffffffff81e263e4 R11: 0000000000000000 R12: 0000000000000000 R13: ffff888036b6c058 R14: ffff888036b6c040 R15: 0000000000000000 FS: 0000000002442400(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffffffffd6 CR3: 000000001d9bc000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: io_rw_done fs/io_uring.c:2905 [inline] kiocb_done+0x1b3/0x980 fs/io_uring.c:2929 io_read+0x3d3/0x1140 fs/io_uring.c:3503 io_issue_sqe+0x209/0x6ba0 fs/io_uring.c:6558 io_wq_submit_work+0x1d4/0x300 fs/io_uring.c:6707 io_worker_handle_work+0xcb1/0x1950 fs/io-wq.c:560 io_wqe_worker+0x2cc/0xbb0 fs/io-wq.c:609 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Modules linked in: CR2: 0000000000000000 ---[ end trace f60cb53b8a968c33 ]--- RIP: 0010:0x0 Code: Unable to access opcode bytes at RIP 0xffffffffffffffd6. RSP: 0018:ffffc900016af910 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff888036b6c000 RBP: ffff888036b6c000 R08: 0000000000000000 R09: ffff8880191787d7 R10: ffffffff81e263e4 R11: 0000000000000000 R12: 0000000000000000 R13: ffff888036b6c058 R14: ffff888036b6c040 R15: 0000000000000000 FS: 0000000002442400(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffffffffd6 CR3: 000000001d9bc000 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