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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 8CE2AC433EF for ; Tue, 17 May 2022 18:14:11 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1346754AbiEQSOG (ORCPT ); Tue, 17 May 2022 14:14:06 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35150 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1352127AbiEQSNe (ORCPT ); Tue, 17 May 2022 14:13:34 -0400 Received: from mail-io1-f71.google.com (mail-io1-f71.google.com [209.85.166.71]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id AEDEA522E5 for ; Tue, 17 May 2022 11:13:22 -0700 (PDT) Received: by mail-io1-f71.google.com with SMTP id s129-20020a6b2c87000000b00657c1a3b52fso12834058ios.21 for ; Tue, 17 May 2022 11:13:22 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:mime-version:date:message-id:subject:from:to; bh=Ec1+WPY44NjjWQGgm/fKM4RZ1+UwW/dQmTOsqUBCVt4=; b=rtu0CjaKDOzOVySie3uYOeXpo1WyX6xDklwn6reNPdqZtmTqvPOmjiOlm9v6WpOOBd SNV4Bv5hOhbytsHTwCg+rnWzuk/71UAxKh7fLfM0TnegboeQycp1CIvlK3pXmOhlkhp0 +pL0ncFP+/0/vW7aW7xh94SQMbNc9kgQ7OK1SzKFvOE0BrmlcDN8yR4IB5VB2NkdlCe3 GxCfcXat3AUkGs3a8GgeN9KHWh4ICBehF03XYhsJrtpbMfD6XRK9jug0tSegsrhM3iSJ Yv6LYfH078yhjGJ9OKi4plG6YeYmDPsRt8XzIVfMMoH6LBO7JhgitJMaFJqMoMUWH5sj 8OcQ== X-Gm-Message-State: AOAM530MtjEDYB9fI/55QOk0fbtjkCrpUG+rI/uQgQfdVcjIyj64lKKO L7IxFuttPGHxYS4LS9oHS6+LH9/OcadRFXj6e50Nplh1mPgz X-Google-Smtp-Source: ABdhPJzb4u16T3LJkX1vKIkcnzOsUsEXniqdWgB0HMLgITYwOY48RC2c6eFUXknCPVdIfEOkCJOEJadExzNb2VzW3AdbkFIASFOR MIME-Version: 1.0 X-Received: by 2002:a05:6e02:1b03:b0:2d1:249b:f94e with SMTP id i3-20020a056e021b0300b002d1249bf94emr5486209ilv.219.1652811202010; Tue, 17 May 2022 11:13:22 -0700 (PDT) Date: Tue, 17 May 2022 11:13:21 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <00000000000093a60105df3918eb@google.com> Subject: [syzbot] BUG: unable to handle kernel NULL pointer dereference in io_do_iopoll 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: io-uring@vger.kernel.org Hello, syzbot found the following issue on: HEAD commit: 42226c989789 Linux 5.18-rc7 git tree: upstream console+strace: https://syzkaller.appspot.com/x/log.txt?x=125b807ef00000 kernel config: https://syzkaller.appspot.com/x/.config?x=902c5209311d387c dashboard link: https://syzkaller.appspot.com/bug?extid=1a0a53300ce782f8b3ad compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=149eb59ef00000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=17cc57c6f00000 The issue was bisected to: commit 3f1d52abf098c85b177b8c6f5b310e8347d1bc42 Author: Jens Axboe Date: Tue Mar 29 16:43:56 2022 +0000 io_uring: defer msg-ring file validity check until command issue bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=1504cbaef00000 final oops: https://syzkaller.appspot.com/x/report.txt?x=1704cbaef00000 console output: https://syzkaller.appspot.com/x/log.txt?x=1304cbaef00000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+1a0a53300ce782f8b3ad@syzkaller.appspotmail.com Fixes: 3f1d52abf098 ("io_uring: defer msg-ring file validity check until command issue") BUG: kernel NULL pointer dereference, address: 0000000000000000 #PF: supervisor instruction fetch in kernel mode #PF: error_code(0x0010) - not-present page PGD 0 P4D 0 Oops: 0010 [#1] PREEMPT SMP KASAN CPU: 0 PID: 3596 Comm: syz-executor359 Not tainted 5.18.0-rc7-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:ffffc9000325fb68 EFLAGS: 00010246 RAX: ffffffff89dad220 RBX: dffffc0000000000 RCX: 0000000000000000 RDX: 0000000000000003 RSI: ffffc9000325fbe0 RDI: ffff8880213388c0 RBP: ffff888021338901 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffff81ec11a0 R11: 0000000000000000 R12: 0000000000000003 R13: ffffc9000325fbe0 R14: ffff8880213388c0 R15: ffff888021338938 FS: 0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffffffffd6 CR3: 000000000ba8e000 CR4: 0000000000350ef0 Call Trace: io_do_iopoll+0x262/0x1080 fs/io_uring.c:2776 io_iopoll_try_reap_events+0xba/0x158 fs/io_uring.c:2829 io_ring_ctx_wait_and_kill+0x1d9/0x327 fs/io_uring.c:10167 io_uring_release+0x42/0x46 fs/io_uring.c:10184 __fput+0x277/0x9d0 fs/file_table.c:317 task_work_run+0xdd/0x1a0 kernel/task_work.c:164 exit_task_work include/linux/task_work.h:37 [inline] do_exit+0xaff/0x2a00 kernel/exit.c:795 do_group_exit+0xd2/0x2f0 kernel/exit.c:925 __do_sys_exit_group kernel/exit.c:936 [inline] __se_sys_exit_group kernel/exit.c:934 [inline] __x64_sys_exit_group+0x3a/0x50 kernel/exit.c:934 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f115bc1bf19 Code: Unable to access opcode bytes at RIP 0x7f115bc1beef. RSP: 002b:00007ffde3b5abf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 00007f115bc90290 RCX: 00007f115bc1bf19 RDX: 000000000000003c RSI: 00000000000000e7 RDI: 0000000000000000 RBP: 0000000000000000 R08: ffffffffffffffc0 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f115bc90290 R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000001 Modules linked in: CR2: 0000000000000000 ---[ end trace 0000000000000000 ]--- RIP: 0010:0x0 Code: Unable to access opcode bytes at RIP 0xffffffffffffffd6. RSP: 0018:ffffc9000325fb68 EFLAGS: 00010246 RAX: ffffffff89dad220 RBX: dffffc0000000000 RCX: 0000000000000000 RDX: 0000000000000003 RSI: ffffc9000325fbe0 RDI: ffff8880213388c0 RBP: ffff888021338901 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffff81ec11a0 R11: 0000000000000000 R12: 0000000000000003 R13: ffffc9000325fbe0 R14: ffff8880213388c0 R15: ffff888021338938 FS: 0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffffffffd6 CR3: 000000000ba8e000 CR4: 0000000000350ef0 --- 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. For information about bisection process see: https://goo.gl/tpsmEJ#bisection syzbot can test patches for this issue, for details see: https://goo.gl/tpsmEJ#testing-patches