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=-3.7 required=3.0 tests=BAYES_00,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 844E7C4320A for ; Mon, 16 Aug 2021 21:41:26 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 67B8F60F39 for ; Mon, 16 Aug 2021 21:41:26 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232204AbhHPVl5 (ORCPT ); Mon, 16 Aug 2021 17:41:57 -0400 Received: from mail-io1-f72.google.com ([209.85.166.72]:50005 "EHLO mail-io1-f72.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233869AbhHPVl4 (ORCPT ); Mon, 16 Aug 2021 17:41:56 -0400 Received: by mail-io1-f72.google.com with SMTP id k6-20020a6b3c060000b0290568c2302268so9950270iob.16 for ; Mon, 16 Aug 2021 14:41:24 -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:in-reply-to:message-id:subject :from:to; bh=FhLW1Y4gLrET7ksWx6p1KtCm+E7On21GQBX7bvtoqtQ=; b=BLIEejQ4Fw5iBkTUEkuYNQTwXvti7At7CIGz/69HMzlrHPG+1LJivZVmAyqu/nHLd3 4l7rgrrxxSYWUOEzIjc6Uhz3t+LqAA4qbktMiVwdK4iXD24ZyRqy1kzwFJhq1bZkmEVL Qc9daqkdRqV/3jSyl2Zf+5HLVS60KgFCR1arPpY+QhX79AfJYFu42rU4bFcJJATHXcnz Acs9vLtyI48A9nOYjEkiW9ZHQY+VcxbkM/dHocy+NYAC23Xsm3uM+w13E5Y0u9DCWava ui7UVq2XSm1kYBalM5A0aR43bBT3iosY4EiSl7h9aZulrlFTbpmxs7CEjoa/iefyTBRF dICg== X-Gm-Message-State: AOAM532xT0tC0MhfdEF2OmzkZShkb0P/sYH1NxaEqnV2DQ8MuT7YNqZg mzYD6SmsquDjZ9PKxe1EDrc8WM2jDVUfZ7aynjxuI1lx4RqG X-Google-Smtp-Source: ABdhPJxafQrJLNi6FZ8Np826frnvibhkMT6mVUD2w4P0rhM8VdQBvsbEUfGzXU157cEV1LbH9sNsGaQaaJl2XkW7Nl64t7l4wMN2 MIME-Version: 1.0 X-Received: by 2002:a92:8707:: with SMTP id m7mr37831ild.177.1629150084461; Mon, 16 Aug 2021 14:41:24 -0700 (PDT) Date: Mon, 16 Aug 2021 14:41:24 -0700 In-Reply-To: <00000000000020339705c9ad30ee@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <00000000000011fc2505c9b41023@google.com> Subject: Re: [syzbot] general protection fault in __io_queue_sqe 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 syzbot has found a reproducer for the following issue on: HEAD commit: b9011c7e671d Add linux-next specific files for 20210816 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=1784d5e9300000 kernel config: https://syzkaller.appspot.com/x/.config?x=a245d1aa4f055cc1 dashboard link: https://syzkaller.appspot.com/bug?extid=2b85e9379c34945fe38f 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=17479216300000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=147f0111300000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+2b85e9379c34945fe38f@syzkaller.appspotmail.com general protection fault, probably for non-canonical address 0xdffffc000000000b: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000058-0x000000000000005f] CPU: 0 PID: 6542 Comm: syz-executor423 Not tainted 5.14.0-rc5-next-20210816-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__io_req_set_refcount fs/io_uring.c:1152 [inline] RIP: 0010:__io_prep_linked_timeout fs/io_uring.c:1348 [inline] RIP: 0010:io_prep_linked_timeout fs/io_uring.c:1356 [inline] RIP: 0010:__io_queue_sqe+0x278/0xeb0 fs/io_uring.c:6708 Code: 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 07 0c 00 00 48 b8 00 00 00 00 00 fc ff df 4c 8b 65 70 49 8d 7c 24 58 48 89 fa 48 c1 ea 03 <0f> b6 04 02 84 c0 74 08 3c 03 0f 8e 3e 0b 00 00 45 8b 74 24 58 31 RSP: 0018:ffffc90002e4fd48 EFLAGS: 00010202 RAX: dffffc0000000000 RBX: 1ffff920005c9fb0 RCX: 0000000000000000 RDX: 000000000000000b RSI: ffffffff81e1bcbf RDI: 0000000000000058 RBP: ffff88807afc6280 R08: 0000000000000001 R09: ffff88807afc62df R10: ffffed100f5f8c5b R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: ffff88807afc62f0 R15: ffff88807afc62f0 FS: 000000000169a300(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000200002c4 CR3: 0000000072b0d000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: io_req_task_submit+0xaa/0x120 fs/io_uring.c:2139 tctx_task_work+0x106/0x540 fs/io_uring.c:2063 task_work_run+0xdd/0x1a0 kernel/task_work.c:164 tracehook_notify_signal include/linux/tracehook.h:212 [inline] handle_signal_work kernel/entry/common.c:146 [inline] exit_to_user_mode_loop kernel/entry/common.c:172 [inline] exit_to_user_mode_prepare+0x256/0x290 kernel/entry/common.c:209 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline] syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:302 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x43f169 Code: 28 c3 e8 2a 14 00 00 66 2e 0f 1f 84 00 00 00 00 00 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 73 01 c3 48 c7 c1 c0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffe2bd862a8 EFLAGS: 00000246 ORIG_RAX: 00000000000001aa RAX: 0000000000000200 RBX: 00000000004ad018 RCX: 000000000043f169 RDX: 0000000000000000 RSI: 00000000000045f5 RDI: 0000000000000003 RBP: 0000000000403150 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000004031e0 R13: 0000000000000000 R14: 00000000004ad018 R15: 0000000000400488 Modules linked in: ---[ end trace bbf4e48f02e6cc2c ]--- RIP: 0010:__io_req_set_refcount fs/io_uring.c:1152 [inline] RIP: 0010:__io_prep_linked_timeout fs/io_uring.c:1348 [inline] RIP: 0010:io_prep_linked_timeout fs/io_uring.c:1356 [inline] RIP: 0010:__io_queue_sqe+0x278/0xeb0 fs/io_uring.c:6708 Code: 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 07 0c 00 00 48 b8 00 00 00 00 00 fc ff df 4c 8b 65 70 49 8d 7c 24 58 48 89 fa 48 c1 ea 03 <0f> b6 04 02 84 c0 74 08 3c 03 0f 8e 3e 0b 00 00 45 8b 74 24 58 31 RSP: 0018:ffffc90002e4fd48 EFLAGS: 00010202 RAX: dffffc0000000000 RBX: 1ffff920005c9fb0 RCX: 0000000000000000 RDX: 000000000000000b RSI: ffffffff81e1bcbf RDI: 0000000000000058 RBP: ffff88807afc6280 R08: 0000000000000001 R09: ffff88807afc62df R10: ffffed100f5f8c5b R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: ffff88807afc62f0 R15: ffff88807afc62f0 FS: 000000000169a300(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000200002c4 CR3: 0000000072b0d000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 89 fa mov %edi,%edx 2: 48 c1 ea 03 shr $0x3,%rdx 6: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) a: 0f 85 07 0c 00 00 jne 0xc17 10: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 17: fc ff df 1a: 4c 8b 65 70 mov 0x70(%rbp),%r12 1e: 49 8d 7c 24 58 lea 0x58(%r12),%rdi 23: 48 89 fa mov %rdi,%rdx 26: 48 c1 ea 03 shr $0x3,%rdx 2a: 0f b6 04 02 movzbl (%rdx,%rax,1),%eax <-- trapping instruction 2e: 84 c0 test %al,%al 30: 74 08 je 0x3a 32: 3c 03 cmp $0x3,%al 34: 0f 8e 3e 0b 00 00 jle 0xb78 3a: 45 8b 74 24 58 mov 0x58(%r12),%r14d 3f: 31 .byte 0x31