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=-3.6 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, 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 EEFF6C2D0A3 for ; Sat, 7 Nov 2020 00:51:48 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A2A6E206E3 for ; Sat, 7 Nov 2020 00:51:48 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="ddbbMrns" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727257AbgKGAvs (ORCPT ); Fri, 6 Nov 2020 19:51:48 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56986 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727178AbgKGAvs (ORCPT ); Fri, 6 Nov 2020 19:51:48 -0500 Received: from mail-qk1-x72e.google.com (mail-qk1-x72e.google.com [IPv6:2607:f8b0:4864:20::72e]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id CF6CDC0613CF for ; Fri, 6 Nov 2020 16:51:47 -0800 (PST) Received: by mail-qk1-x72e.google.com with SMTP id t191so1675733qka.4 for ; Fri, 06 Nov 2020 16:51:47 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=MidwcJtEuz6EP2nXlGHsa+y3NJw740xoS40pVjjYvk0=; b=ddbbMrnsXecAPJYlUgKXbtoGlYHfo6iB0X3wLUgRioeDrqtLE2m/d/c36t3IsPLf50 dxXQV1VlcIbvayIMgxsOSmeO69PdPcmIfI7CrrYUOAUDAFvUhx2Z0SMJE52LBdJuzKSz pJwfb2BVmHLovH8W9Lhy6lrcw5cqcActYUlwc1/0yOQFbY9kE3C9cpj1VUBxwn7A2uOf dr402WxqWY0I9RmPH+yDe3dXjWbQdh3cJC9s4+HzN7L1OQicz6s6vxA+g/zNiiE0q0XD gVa9Kv9oVbw7BSldPpjTA04/C0wbRxK/aUFK8wCfYm/4VQvoyI2Y2QdEcf6/krjuPW9e XurA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=MidwcJtEuz6EP2nXlGHsa+y3NJw740xoS40pVjjYvk0=; b=qmvQRL2nW8hrjVlSF5alFNHEdcGzn5GLNuxckSNP1crh4vvEBeEmE+AuKTWtWhUF1a gFsXk1ucOiqnbTDAw9c4+1EO/EHRSb9/tejJA3vMc7P4Kt7ZO3XWJ7DCeDmay1cfXNOo EobVNe3yhWBUFYkP/TA7cQ5zPhc7iYzHYs+74uomI46qdaO5f4bPmt4BshfmOClKHxZX lCl90eLsgY690HZt/NmG8MHtuCDbKZbZSAdOneU0AtA6S4npIS12pZP+cmaWpi0RNCo3 waKICzHv0eMQ2DTSXGS9xHlB+hXkNMasPQumDSlVRUmUJD0bN7bzezUMPdV0dXIViFJJ qdpQ== X-Gm-Message-State: AOAM531tw7FgD0cSlAF9PlSewwJpsi+H+pC2M7pyEYHgDJrwMD/f49iY VnG/UcRqfN6qS5E5lbOkcGlwKEpAtQavMA7uNM8= X-Google-Smtp-Source: ABdhPJznWT/622fpVqt2Gsy3Ljgp9iq7IK8X7U4+Zu9u++v3B+dfH7nZM7WMoClwx4oYExuxxw/zqGtAPWtzsaaR1eE= X-Received: by 2002:a05:620a:24ce:: with SMTP id m14mr4272639qkn.399.1604710305908; Fri, 06 Nov 2020 16:51:45 -0800 (PST) MIME-Version: 1.0 References: In-Reply-To: From: Josef Date: Sat, 7 Nov 2020 01:51:35 +0100 Message-ID: Subject: Re: Using SQPOLL for-5.11/io_uring kernel NULL pointer dereference To: Jens Axboe , io-uring Cc: norman@apache.org Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: io-uring@vger.kernel.org On Sat, 7 Nov 2020 at 01:45, Josef wrote: > > Hi, > > I came across some strange behaviour in some netty-io_uring tests when > using SQPOLL which seems like a bug to me, however I don't know how to > reproduce it, as the error occurs randomly which leads to a kernel > "freeze", I spend all day trying to figure out how to reproduce this > error...any idea what the cause is? > > branch: for-5.11/io_uring > last commit 34f98f655639b32f28c30c27dbbea57f8c304d9c > > (please don't waste your time as I'll take a look on the weekend) > > --- > Josef Grieb I forgot to mention that same cores are running at 100% cpu usage, when error occurs ---- Josef Grieb