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=-8.7 required=3.0 tests=BAYES_00,FROM_LOCAL_HEX, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING, SPF_HELO_NONE,SPF_PASS 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 5F175C433B4 for ; Thu, 8 Apr 2021 14:42:15 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 37C09610F7 for ; Thu, 8 Apr 2021 14:42:15 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231574AbhDHOmZ (ORCPT ); Thu, 8 Apr 2021 10:42:25 -0400 Received: from mail-il1-f200.google.com ([209.85.166.200]:54685 "EHLO mail-il1-f200.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231480AbhDHOmY (ORCPT ); Thu, 8 Apr 2021 10:42:24 -0400 Received: by mail-il1-f200.google.com with SMTP id f14so1433443ilr.21 for ; Thu, 08 Apr 2021 07:42:13 -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=omWXKOI+6Y8Uu1OPaxNuoex04esEAItjZ32ZmdFimmw=; b=IVIuG6T3UKwxk4WSPqY0MvkpidrE9W8oDF+Ecf0JRxflwYb1RcSjFrXna9YfMmPhYQ e7Ijmt5KK1rr7eqfvuti1hTjz4Oh6wElgLMNFPIAqDMm1w7z45L1dny5Xacdq1ZhF9/F x2v/yl5kb8Kz409XFv+gJEWnlun7nBr23uwQ0CCWJPk6l72BvtmRT9CmcSCiziSMwPok Y5ma/V1cxZZo/e+IiR1gG8dj9Rn2BEdUsBCFzC7/K08/w9gHWfxjx40Ze4cRaWFaiIME Rl/PYpyTGGAqmshLA+NZ+spjsWh4O+8YWWJuhJq8bW8uw6RRe08iqmoRbZWJabDUp/RS anlQ== X-Gm-Message-State: AOAM531x8yGbFmtGbQbI7CU/HFiis6INZXsRq13riSjihCpIbnRp4xIC xEeOVo6bHu45BFPHi1JSINUcxlvFn+5XuCHuBSjIHOKuq1xT X-Google-Smtp-Source: ABdhPJxT4mVuv0smV/u0E+2/BNXePBlc2qm71w8Ei4gtIMnXhxIoO1l841fQD80v+mhg1g7hQOoSD2BRAO6vX0trzrZ2iHsUzVsX MIME-Version: 1.0 X-Received: by 2002:a02:6654:: with SMTP id l20mr9360186jaf.55.1617892932933; Thu, 08 Apr 2021 07:42:12 -0700 (PDT) Date: Thu, 08 Apr 2021 07:42:12 -0700 In-Reply-To: <346fb87c-6fae-284d-62a0-edafde451861@gmail.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <0000000000008d622905bf770dd6@google.com> Subject: Re: [syzbot] INFO: task hung in io_ring_exit_work From: syzbot To: asml.silence@gmail.com, axboe@kernel.dk, io-uring@vger.kernel.org, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: io-uring@vger.kernel.org Hello, syzbot has tested the proposed patch but the reproducer is still triggering an issue: INFO: task hung in io_ring_exit_work INFO: task kworker/u4:0:9 blocked for more than 143 seconds. Not tainted 5.12.0-rc2-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/u4:0 state:D stack:26056 pid: 9 ppid: 2 flags:0x00004000 Workqueue: events_unbound io_ring_exit_work Call Trace: context_switch kernel/sched/core.c:4324 [inline] __schedule+0x911/0x21b0 kernel/sched/core.c:5075 schedule+0xcf/0x270 kernel/sched/core.c:5154 schedule_timeout+0x1db/0x250 kernel/time/timer.c:1868 do_wait_for_common kernel/sched/completion.c:85 [inline] __wait_for_common kernel/sched/completion.c:106 [inline] wait_for_common kernel/sched/completion.c:117 [inline] wait_for_completion+0x168/0x270 kernel/sched/completion.c:138 io_ring_exit_work+0x4e8/0x12d0 fs/io_uring.c:8616 process_one_work+0x98d/0x1600 kernel/workqueue.c:2275 worker_thread+0x64c/0x1120 kernel/workqueue.c:2421 kthread+0x3b1/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 INFO: task kworker/u4:1:25 blocked for more than 143 seconds. Not tainted 5.12.0-rc2-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/u4:1 state:D stack:25560 pid: 25 ppid: 2 flags:0x00004000 Workqueue: events_unbound io_ring_exit_work Call Trace: context_switch kernel/sched/core.c:4324 [inline] __schedule+0x911/0x21b0 kernel/sched/core.c:5075 schedule+0xcf/0x270 kernel/sched/core.c:5154 schedule_timeout+0x14a/0x250 kernel/time/timer.c:1892 Tested on: commit: a2a68d4c io_uring: signalling fun / syz test git tree: https://github.com/isilence/linux.git syz_test3 console output: https://syzkaller.appspot.com/x/log.txt?x=12eed711d00000 kernel config: https://syzkaller.appspot.com/x/.config?x=86318203e865a02b dashboard link: https://syzkaller.appspot.com/bug?extid=93f72b3885406bb09e0d compiler: