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 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 F2AADC2D0D2 for ; Sat, 21 Dec 2019 08:05:11 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id C9053206D3 for ; Sat, 21 Dec 2019 08:05:11 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726131AbfLUIFK (ORCPT ); Sat, 21 Dec 2019 03:05:10 -0500 Received: from mail-io1-f72.google.com ([209.85.166.72]:39793 "EHLO mail-io1-f72.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725944AbfLUIFJ (ORCPT ); Sat, 21 Dec 2019 03:05:09 -0500 Received: by mail-io1-f72.google.com with SMTP id i4so7657628iog.6 for ; Sat, 21 Dec 2019 00:05:08 -0800 (PST) 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=deYFK8ddtWh1jagx++4fGZM5W0SjiPRG6DK7H6PrJhc=; b=i184WY/tEkWbGYFvhMoAcYJteSxVG6xpH6zQzPX6jCt2LyIf1It07Rh3t4R3GmVq9E CUm8oiCER1D5PZ0IPTSHPGeogzO8X5RYxIn8cyurk90gq0uzaHJ5aSAXZbhQAh1m13Vx V8okSF0garYoNmEWM56HS67cpSBNyQPcJSfZhlbsZ7otBLgPnYPc2QaERd4UIZqAksk5 UvWwB69bHja5ALz73+/Wg71YD/ko8IFar/WDgY/alQWKeVRHMFCrwGuMeQr3asPuwGHO BMkrmdQvhmfwcwv38YIKMIOBTFCMBGBey4qSrSuwXj6e1BE0YzuRVHJ9maNFShAz8Pcg P44Q== X-Gm-Message-State: APjAAAVma27G8UgHK/0X31QMJOIHvqpBF0xuvWCwyVmCnPIfg6FZAKXt q9XQu3c4KjAj0iWRAu43F4KgA3LffFNSBsgqk7+tlcfSNFg3 X-Google-Smtp-Source: APXvYqzhDnpMLztsh0UlrrdoM00CUjaZhiVYUYPccEAHhKGyarpAS/rqpAfitgprb+IaOAfl0N3+4vHIWUa3JSskvLWr8H67eDId MIME-Version: 1.0 X-Received: by 2002:a02:3409:: with SMTP id x9mr15588491jae.3.1576915507909; Sat, 21 Dec 2019 00:05:07 -0800 (PST) Date: Sat, 21 Dec 2019 00:05:07 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000b09d8c059a3240be@google.com> Subject: WARNING in percpu_ref_exit (2) 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"; format=flowed; delsp=yes Sender: io-uring-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: io-uring@vger.kernel.org Hello, syzbot found the following crash on: HEAD commit: 7ddd09fc Add linux-next specific files for 20191220 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=12a18cc6e00000 kernel config: https://syzkaller.appspot.com/x/.config?x=f183b01c3088afc6 dashboard link: https://syzkaller.appspot.com/bug?extid=8c4a14856e657b43487c compiler: gcc (GCC) 9.0.0 20181231 (experimental) syz repro: https://syzkaller.appspot.com/x/repro.syz?x=14b8f351e00000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=14b51925e00000 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+8c4a14856e657b43487c@syzkaller.appspotmail.com ------------[ cut here ]------------ WARNING: CPU: 1 PID: 11482 at lib/percpu-refcount.c:111 percpu_ref_exit+0xab/0xd0 lib/percpu-refcount.c:111 Kernel panic - not syncing: panic_on_warn set ... CPU: 1 PID: 11482 Comm: syz-executor051 Not tainted 5.5.0-rc2-next-20191220-syzkaller #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+0x197/0x210 lib/dump_stack.c:118 panic+0x2e3/0x75c kernel/panic.c:221 __warn.cold+0x2f/0x3e kernel/panic.c:582 report_bug+0x289/0x300 lib/bug.c:195 fixup_bug arch/x86/kernel/traps.c:174 [inline] fixup_bug arch/x86/kernel/traps.c:169 [inline] do_error_trap+0x11b/0x200 arch/x86/kernel/traps.c:267 do_invalid_op+0x37/0x50 arch/x86/kernel/traps.c:286 invalid_op+0x23/0x30 arch/x86/entry/entry_64.S:1027 RIP: 0010:percpu_ref_exit+0xab/0xd0 lib/percpu-refcount.c:111 Code: 00 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 75 1d 48 c7 43 08 03 00 00 00 e8 01 41 e5 fd 5b 41 5c 41 5d 5d c3 e8 f5 40 e5 fd <0f> 0b eb bf 4c 89 ef e8 29 2c 23 fe eb d9 e8 82 2b 23 fe eb a7 4c RSP: 0018:ffffc9000cb17968 EFLAGS: 00010293 RAX: ffff8880a3390640 RBX: ffff8880a83a8010 RCX: ffffffff83901432 RDX: 0000000000000000 RSI: ffffffff8390149b RDI: ffff8880a83a8028 RBP: ffffc9000cb17980 R08: ffff8880a3390640 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000607f51435750 R13: ffff8880a83a8018 R14: ffff888097b95000 R15: ffff888097b95228 io_sqe_files_unregister+0x7d/0x2f0 fs/io_uring.c:4623 io_ring_ctx_free fs/io_uring.c:5575 [inline] io_ring_ctx_wait_and_kill+0x430/0x9a0 fs/io_uring.c:5644 io_uring_release+0x42/0x50 fs/io_uring.c:5652 __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+0x909/0x2f20 kernel/exit.c:797 do_group_exit+0x135/0x360 kernel/exit.c:895 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:160 prepare_exit_to_usermode arch/x86/entry/common.c:195 [inline] syscall_return_slowpath arch/x86/entry/common.c:278 [inline] do_syscall_64+0x676/0x790 arch/x86/entry/common.c:304 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4468f9 Code: e8 0c e8 ff ff 48 83 c4 18 c3 0f 1f 80 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 0f 83 5b 07 fc ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f7ef700ddb8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 00000000006dbc38 RCX: 00000000004468f9 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00000000006dbc38 RBP: 00000000006dbc30 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dbc3c R13: 00007fff8371e42f R14: 00007f7ef700e9c0 R15: 0000000000000001 Kernel Offset: disabled Rebooting in 86400 seconds.. --- 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. syzbot can test patches for this bug, for details see: https://goo.gl/tpsmEJ#testing-patches