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=-0.7 required=3.0 tests=FROM_LOCAL_HEX, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_PASS,URIBL_BLOCKED autolearn=ham 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 ED75CC43381 for ; Fri, 22 Mar 2019 07:14:02 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id BD98520830 for ; Fri, 22 Mar 2019 07:14:02 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727707AbfCVHOC (ORCPT ); Fri, 22 Mar 2019 03:14:02 -0400 Received: from mail-io1-f72.google.com ([209.85.166.72]:56431 "EHLO mail-io1-f72.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727604AbfCVHOB (ORCPT ); Fri, 22 Mar 2019 03:14:01 -0400 Received: by mail-io1-f72.google.com with SMTP id s184so982198iod.23 for ; Fri, 22 Mar 2019 00:14:01 -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=kkthjFO2LoxdqDWlU8fzl2TfzJas6xfEmLfZna8RI+I=; b=FqZzQGmm2vrjFA4I+Z5y016f1YSn29gefnZLHrVVoT+JiRwCGHjnC5/Wtkernz8v71 VuUtuZZmBvMkaEI0kKiJwKqaruR+bG64kWPwifVRTwrTbIjeZSC7NGRq/iSOST2PghRu NfqtoEYHw/EeDHoYz0hBvl/9gjs4Fhr1THyKzIsOM2tHuyDMFXlkxwtnneuwFtrfCHkT TallvkfmlxFAXtLFbc7Cpvrh9aR8RfLZ9/ZG2gSv/EOops3Oz5o+3OWlu1rZZ/eE6yg3 hTp8e6LMDU5QwReYxMfeU5JjFmj5bCJEm0FYMiF4+V1d3Bu/YtTRU/aYJ/bx2wN5TxzJ 0MGA== X-Gm-Message-State: APjAAAXN+5hoEJ1W8z0bnIMkFYLK78t1GIQ1LoeLbKvAxnV40L0KrnAX JPAEvVx+vDdUjd+/wpkLq4J84UHXXhZ/G8uZtOo2ENuBYpaA X-Google-Smtp-Source: APXvYqwVeJkFj+kZRFeV0cGVLtKDGYWkBKqh9CQ7x6U3PJ8MA0Zgna957qEIe/qSuJtbGjgOHzvwAyudMuiHxp1UY6h7XvlmuFdp MIME-Version: 1.0 X-Received: by 2002:a6b:ea19:: with SMTP id m25mr6518156ioc.291.1553238840994; Fri, 22 Mar 2019 00:14:00 -0700 (PDT) Date: Fri, 22 Mar 2019 00:14:00 -0700 In-Reply-To: <000000000000700cdc057935aa71@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <0000000000005e71740584a999d1@google.com> Subject: Re: possible deadlock in userfaultfd_release From: syzbot To: adam.manzanares@wdc.com, avi@scylladb.com, bcrl@kvack.org, darrick.wong@oracle.com, hch@lst.de, jmoyer@redhat.com, linux-aio@kvack.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: linux-fsdevel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org syzbot has bisected this bug to: commit bfe4037e722ec672c9dafd5730d9132afeeb76e9 Author: Christoph Hellwig Date: Mon Jul 16 07:08:20 2018 +0000 aio: implement IOCB_CMD_POLL bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=1382985d200000 start commit: bfe4037e aio: implement IOCB_CMD_POLL git tree: upstream final crash: https://syzkaller.appspot.com/x/report.txt?x=1042985d200000 console output: https://syzkaller.appspot.com/x/log.txt?x=1782985d200000 kernel config: https://syzkaller.appspot.com/x/.config?x=5c0a49d2b5210087 dashboard link: https://syzkaller.appspot.com/bug?extid=53c0b767f7ca0dc0c451 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1111f2eb400000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=13e874f5400000 Reported-by: syzbot+53c0b767f7ca0dc0c451@syzkaller.appspotmail.com Fixes: bfe4037e722e ("aio: implement IOCB_CMD_POLL") For information about bisection process see: https://goo.gl/tpsmEJ#bisection