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=-5.5 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,NICE_REPLY_A, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 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 AE0D1C433DF for ; Mon, 10 Aug 2020 18:11:45 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 7406F20838 for ; Mon, 10 Aug 2020 18:11:45 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=kernel-dk.20150623.gappssmtp.com header.i=@kernel-dk.20150623.gappssmtp.com header.b="BsvJhtuE" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728119AbgHJSLm (ORCPT ); Mon, 10 Aug 2020 14:11:42 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:32978 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728116AbgHJSLl (ORCPT ); Mon, 10 Aug 2020 14:11:41 -0400 Received: from mail-pl1-x636.google.com (mail-pl1-x636.google.com [IPv6:2607:f8b0:4864:20::636]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 28E3EC061788 for ; Mon, 10 Aug 2020 11:11:41 -0700 (PDT) Received: by mail-pl1-x636.google.com with SMTP id o1so5442328plk.1 for ; Mon, 10 Aug 2020 11:11:41 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel-dk.20150623.gappssmtp.com; s=20150623; h=subject:to:references:from:message-id:date:user-agent:mime-version :in-reply-to:content-language:content-transfer-encoding; bh=S0kQGL1Z8bJks/onFWo7b2UmOXKnEogpEFfQxSaoZZQ=; b=BsvJhtuEB8EnVSkDyBpqlM4lWzlhc+vAlB1NwoCjyNXrKrgAN1esgAeHIAVIzUOGCu hdUl6g9dyqfXgvf8pTL5Ju2D8gHYWrp8bUmyJ1OkI0p8QaUPYIdfnUOVT/GGtEG0dx5y PKCxFkUlHUGzIkX12nGr0dHUhV1NsxIJ+QEaENSRd2DS/K1+OLrS3FuH0EcKEBsdrXPE xjW6ljsHTsqw3n7wY4DbRyDBw71glTLQBWPRF1KmeftWOj2gP0rJZq7zxO0I9byJVfi/ qyqwsO3e0HDCIk4B7p0oArS+W0O0fA+2Z27NCRatQtuucoQtd69/4Xk6iy3L8YrCiYiM 5asQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:to:references:from:message-id:date :user-agent:mime-version:in-reply-to:content-language :content-transfer-encoding; bh=S0kQGL1Z8bJks/onFWo7b2UmOXKnEogpEFfQxSaoZZQ=; b=Zcb2+jJ/GdlhP4rCELPOEmKnap9gcPic03+sWqr5rbC0jS6906V6F4U95qttIYhwZQ nFKxUMrsZn8zSvF0pXy7HgcigD8BOlYq077hmRB33OPDayd3pxjolC7CgEsZ3H5egohk M5i3KNoc2E0ngwm73U4dMsByepCxcuRZWuseNJGuhC9t+mr50U67M3w30YbYnQlCD9tG YC6jk3trMiG5Gz24JxSVO+lYrl9Xlx5tgpX5qn+YVI8TGKLebp8yTmqGJhi/z+k4ifkm HJbl9ius2wcvTszAFRT2KmG1hawN+bZe9blZfBVOQg/op0xvAsmznI+h0g2cJxvv0YQ1 btPg== X-Gm-Message-State: AOAM530x9z0A+HclJdHXRFc6Xj0/lGVQCd9EQZaYu9nqIHPRpldsn7EA aB4rSn4cUdtvwYU/jKpQ9nBzFw== X-Google-Smtp-Source: ABdhPJzCCoxLw6D751mh3seWnzIzGBBgYKolOyGsKXgliby4JAVq7FQ2IASxq3IaDwl0pEMwyd5ZWw== X-Received: by 2002:a17:902:7291:: with SMTP id d17mr6460922pll.141.1597083098512; Mon, 10 Aug 2020 11:11:38 -0700 (PDT) Received: from [192.168.1.182] ([66.219.217.173]) by smtp.gmail.com with ESMTPSA id r15sm24531992pfq.189.2020.08.10.11.11.37 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 10 Aug 2020 11:11:37 -0700 (PDT) Subject: Re: INFO: task hung in io_uring_flush To: Pavel Begunkov , syzbot , io-uring@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com, viro@zeniv.linux.org.uk References: <00000000000099566305ac881a16@google.com> From: Jens Axboe Message-ID: Date: Mon, 10 Aug 2020 12:11:36 -0600 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: io-uring-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: io-uring@vger.kernel.org On 8/10/20 10:08 AM, Pavel Begunkov wrote: > On 10/08/2020 19:04, syzbot wrote: >> syzbot has bisected this issue to: >> >> commit f86cd20c9454847a524ddbdcdec32c0380ed7c9b >> Author: Jens Axboe >> Date: Wed Jan 29 20:46:44 2020 +0000 >> >> io_uring: fix linked command file table usage > > There are several known problems with io_uring_cancel_files() including > races and hangs. I had some drafts and going to patch it in a week or so. I'll let you deal with this one, thanks. -- Jens Axboe