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 32A1CC2D0C0 for ; Sat, 21 Dec 2019 08:43:03 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 04A7A206D3 for ; Sat, 21 Dec 2019 08:43:02 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726057AbfLUInC (ORCPT ); Sat, 21 Dec 2019 03:43:02 -0500 Received: from mail-il1-f197.google.com ([209.85.166.197]:54800 "EHLO mail-il1-f197.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725944AbfLUInC (ORCPT ); Sat, 21 Dec 2019 03:43:02 -0500 Received: by mail-il1-f197.google.com with SMTP id t4so9614970ili.21 for ; Sat, 21 Dec 2019 00:43:01 -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:in-reply-to:message-id:subject :from:to; bh=xU44G83IDVYmN3c7FdaPJTALb5/aKinaCWXRoF+LTv0=; b=OaJIS/BuGssZqrpGI1ER9izj7cMIqGhm8k2haGd1lDO8vFbsRExoKwlyKlHiaUybNH QPIhYyQ8C0C8BRQnCvFbH9/Bg4QFSNKhQLyvK7MjPaGjRpS1E7en1fqyjKR6xqNbAmDI xI1Pieup3JYOKotxvO28sdkJsd9/I14ZZf48RGQLcOWTin3WWzdXL7x7HYTHhDbwOOJm BneapNeATwsofnQjve5c5wxg8BfFIvSLtCVBUqhe6fb9AGA9APRVa6bK7qN3ssBMRc/+ nWZNVxZVMeRdE3OJy9kq3p7qsN7lmNtSTdMgAT8Fhz8hhff9VnvhrJpqpCHdEBVOuKzj 1GGA== X-Gm-Message-State: APjAAAUOMcz6Bnvf9oRNsQfbobHhVmd+B/LwxyV+0Nh+uxKppUzSi0FD KEqA/ag1S+k8jdcROm3BNKbD9iTMrLTlqQ/PcpjVnLFOnSl3 X-Google-Smtp-Source: APXvYqyuTa0ejKszQhq4t1cDUBFdclRyWYWGgRzHUDUmQVrVTb5aXX9IU8liJ2nc0RY4emELLWHbwalTEI6xVDJ0PpVmRGT9Mtvt MIME-Version: 1.0 X-Received: by 2002:a6b:4407:: with SMTP id r7mr11525660ioa.160.1576917781568; Sat, 21 Dec 2019 00:43:01 -0800 (PST) Date: Sat, 21 Dec 2019 00:43:01 -0800 In-Reply-To: <000000000000b09d8c059a3240be@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <00000000000035eda1059a32c80f@google.com> Subject: Re: WARNING in percpu_ref_exit (2) From: syzbot To: axboe@kernel.dk, io-uring@vger.kernel.org, linux-block@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 syzbot has bisected this bug to: commit cbb537634780172137459dead490d668d437ef4d Author: Jens Axboe Date: Mon Dec 9 18:22:50 2019 +0000 io_uring: avoid ring quiesce for fixed file set unregister and update bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=1118aac1e00000 start commit: 7ddd09fc Add linux-next specific files for 20191220 git tree: linux-next final crash: https://syzkaller.appspot.com/x/report.txt?x=1318aac1e00000 console output: https://syzkaller.appspot.com/x/log.txt?x=1518aac1e00000 kernel config: https://syzkaller.appspot.com/x/.config?x=f183b01c3088afc6 dashboard link: https://syzkaller.appspot.com/bug?extid=8c4a14856e657b43487c syz repro: https://syzkaller.appspot.com/x/repro.syz?x=14b8f351e00000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=14b51925e00000 Reported-by: syzbot+8c4a14856e657b43487c@syzkaller.appspotmail.com Fixes: cbb537634780 ("io_uring: avoid ring quiesce for fixed file set unregister and update") For information about bisection process see: https://goo.gl/tpsmEJ#bisection