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 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 56E37C433F5 for ; Sun, 31 Oct 2021 19:40:52 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 3973961040 for ; Sun, 31 Oct 2021 19:40:52 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231134AbhJaTnX (ORCPT ); Sun, 31 Oct 2021 15:43:23 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33222 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230041AbhJaTnW (ORCPT ); Sun, 31 Oct 2021 15:43:22 -0400 Received: from mail-io1-xd36.google.com (mail-io1-xd36.google.com [IPv6:2607:f8b0:4864:20::d36]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E08D7C061570 for ; Sun, 31 Oct 2021 12:40:50 -0700 (PDT) Received: by mail-io1-xd36.google.com with SMTP id e144so19174702iof.3 for ; Sun, 31 Oct 2021 12:40:50 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel-dk.20210112.gappssmtp.com; s=20210112; h=subject:to:references:from:message-id:date:user-agent:mime-version :in-reply-to:content-language:content-transfer-encoding; bh=MzDrzuzpYnbYB0j0l2jWAFKlpNw8zKCZIf59AYFBfkU=; b=VtzIBg9nH2TBJO7RLbVEorGZy2ztmplRMgsK4PAELDA8/WNUpDxGXwzfcjxcFuJSAF SAVOFqg+Gv+pW4X4Qvelr8sPUs5DSADDCw3AHIhBFUBOUubMS5NV4LL2DO8J3H8vjJ7O G2JljQOzoqIgVZ2oxw99zctxez8hhod2UUmW0YBvSEVISKBokwoVWs189hSxEcUfUhc3 /W0+rhwwF24IyC8ogtuc+pxL+/BSQtSThe8WyuNfpLltMG9MJonvlMRz3Kh4fnwDU6IR 0sNkxz/348J/0rygxvs1w5800+gIyXOWkpZJZSC90NInTtBkiR7OKW6AVOo1kh7DF7Ir UtYw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; 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=MzDrzuzpYnbYB0j0l2jWAFKlpNw8zKCZIf59AYFBfkU=; b=5O0jt7im8Lqzv9nJoKLC+Gf1vqRUFTmz9S4dPu07w4Il31HdsrFhDQLHET7GXKuc8W l9c4DANetKhyceE+uw6RQVOZOPtFEdsMVI7szDPAKRk52S0yqq/o8HX4xOXwhZti93RF OI+rkWfavT+IwMpVKYcZ5MaB1dC5RaFPJOz2MlpbCnsPtX8USwWtIkwSL48TX8SkmQ+9 kugUocyDYpCST04aFBtOcB5QdcbNp+mFwMrq+o6VdZ+QyD5tWd2Ospln2k7t7q0wSjvV wJGxdViLYkuAPjndXEV7xpoBiS4LnVNDd8VFfyBpT9YzxelAMfeZTZVTBQQsTZM/VaW7 N+qA== X-Gm-Message-State: AOAM5307Azyo8t1tdb7ddjIse6C5u6IU92VAcFSpgNGA8LdKfYUZZY05 jBTFp+GhUFsLslJ/t1Zhs6YuyQ== X-Google-Smtp-Source: ABdhPJxavGrskLJZx7SWqJM9Byj7QN7LjpAqwfFYPCVd8hoT/PR190/kiFfcZa8ew5N4xoLvuadPUg== X-Received: by 2002:a02:9701:: with SMTP id x1mr17981931jai.97.1635709250298; Sun, 31 Oct 2021 12:40:50 -0700 (PDT) Received: from [192.168.1.116] ([66.219.217.159]) by smtp.gmail.com with ESMTPSA id s12sm2429782iol.30.2021.10.31.12.40.49 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sun, 31 Oct 2021 12:40:49 -0700 (PDT) Subject: Re: [syzbot] INFO: rcu detected stall in tctx_task_work To: syzbot , asml.silence@gmail.com, fweisbec@gmail.com, io-uring@vger.kernel.org, linux-kernel@vger.kernel.org, mingo@kernel.org, syzkaller-bugs@googlegroups.com, tglx@linutronix.de, xiaoguang.wang@linux.alibaba.com References: <00000000000030c35005cfa98ed5@google.com> From: Jens Axboe Message-ID: <13c4d07e-0e4c-ee55-c3be-1b42125f248d@kernel.dk> Date: Sun, 31 Oct 2021 13:40:48 -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: <00000000000030c35005cfa98ed5@google.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: io-uring@vger.kernel.org On 10/31/21 11:40 AM, syzbot wrote: > Hello, > > syzbot found the following issue on: > > HEAD commit: bdcc9f6a5682 Add linux-next specific files for 20211029 > git tree: linux-next > console output: https://syzkaller.appspot.com/x/log.txt?x=10be38f4b00000 > kernel config: https://syzkaller.appspot.com/x/.config?x=4b504bcb4c507265 > dashboard link: https://syzkaller.appspot.com/bug?extid=e4f5deeeccdd5a4873fe > compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=10b915d4b00000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1395f3e2b00000 > > The issue was bisected to: > > commit 34ced75ca1f63fac6148497971212583aa0f7a87 > Author: Xiaoguang Wang > Date: Mon Oct 25 05:38:48 2021 +0000 > > io_uring: reduce frequent add_wait_queue() overhead for multi-shot poll request This was dropped from the tree last week: #syz invalid -- Jens Axboe