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=-2.1 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, 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 183D4C54FCB for ; Sun, 26 Apr 2020 21:53:47 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E72B120700 for ; Sun, 26 Apr 2020 21:53:46 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="gz4u1B/S" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726215AbgDZVxq (ORCPT ); Sun, 26 Apr 2020 17:53:46 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:49178 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726184AbgDZVxq (ORCPT ); Sun, 26 Apr 2020 17:53:46 -0400 Received: from mail-pl1-x642.google.com (mail-pl1-x642.google.com [IPv6:2607:f8b0:4864:20::642]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 402E5C061A0F; Sun, 26 Apr 2020 14:53:46 -0700 (PDT) Received: by mail-pl1-x642.google.com with SMTP id s10so6214716plr.1; Sun, 26 Apr 2020 14:53:46 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=subject:to:cc:references:from:message-id:date:user-agent :mime-version:in-reply-to:content-language:content-transfer-encoding; bh=H5D1PG6e/lMszq0Rf949EFEkle4oIskhG7vE9vM9dC4=; b=gz4u1B/Skr8dsJGByTK2XWhiRHHeIiJZhyUTcQxEMw5oTN+clJwfvrhHWwRaMgDPks SMs+QJlwZcv4XoMltJQ/o7qXuTkMuSfpQdq4HxDJBXB1/Brawn81miRiltA44CJozitD 4/CP/nB3W0TUJfCo2rr6dGLiBAvgxJgcgpsFtrfASPAlOec4eLvqfib9DRtnJAFMUmDU JIsUDSHkLXGpVaSiKplTehHcZ+1gNn/HtN1XqWTqzQ53K/4TPUCPgx3OR0moFSueWT16 epWZKE9C2Q3NooFtA+t+7twpfMYGy3NXlHU/op6j2ucEvcAcjn00qPEOyYTlMZ0JwEwZ +oEA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:to:cc:references:from:message-id:date :user-agent:mime-version:in-reply-to:content-language :content-transfer-encoding; bh=H5D1PG6e/lMszq0Rf949EFEkle4oIskhG7vE9vM9dC4=; b=I3lNpitHO6vpe0BYxvrQqKNvXjQQbDEkNtFH8sNLq1mxcJ+AIUDJkBI4KFkQxLWIAo iklrekpb6q26WBlkiGh3T+HFfepa85nv7SOgjeW6qQuALVC75CKEr6vi4GJcrD7vgvg3 K2oTsWCiHAfO+pRBqKseRgy286SVeJWGwIs7pGKp5wWkLfu8hwjGamk8v8u6Ir3O9B7e zGcMMggptAC7Y+46YVKqQvAvQNIVx98trWae9pyN/nhK1kvkA5RMgI5BvR7zdQHiC05Y 6PYbHyp4p6s/psvXaL5ljRWpyuFeks5gzWoqXewIFXdmtmVCcXMQg3u3JhaBHUdwDovd 63RA== X-Gm-Message-State: AGi0PuakV54nrAg1mNaUHuo3MsQKu5kHRhT0o6j9tDgTZja0geni1mnY iJsXq7CxrgFQaLkoDbD3RA4= X-Google-Smtp-Source: APiQypLlLPgA6Ou9oUq3eMaI0CVQsG9UrGKGpXBdsliinmBgCNXAyiE4zSfQmRisUhR9LgkPSFMytg== X-Received: by 2002:a17:90a:6d03:: with SMTP id z3mr20045920pjj.32.1587938024753; Sun, 26 Apr 2020 14:53:44 -0700 (PDT) Received: from [192.168.86.235] (c-73-241-150-58.hsd1.ca.comcast.net. [73.241.150.58]) by smtp.gmail.com with ESMTPSA id 67sm954454pfx.108.2020.04.26.14.53.43 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sun, 26 Apr 2020 14:53:44 -0700 (PDT) Subject: Re: INFO: rcu detected stall in wg_packet_tx_worker To: "Jason A. Donenfeld" , Eric Dumazet Cc: syzbot , David Miller , Florian Fainelli , Greg Kroah-Hartman , jhs@mojatatu.com, =?UTF-8?B?SmnFmcOtIFDDrXJrbw==?= , Krzysztof Kozlowski , kuba@kernel.org, kvalo@codeaurora.org, leon@kernel.org, LKML , linux-kselftest@vger.kernel.org, Netdev , Shuah Khan , syzkaller-bugs@googlegroups.com, Thomas Gleixner , vivien.didelot@gmail.com, Cong Wang References: <0000000000005fd19505a4355311@google.com> <29bd64f4-5fe0-605e-59cc-1afa199b1141@gmail.com> From: Eric Dumazet Message-ID: <85e76f66-f807-ad12-df9d-0805b68133fa@gmail.com> Date: Sun, 26 Apr 2020 14:53:42 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.6.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-kselftest-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org On 4/26/20 1:46 PM, Jason A. Donenfeld wrote: > > Ah, whew, okay. I had just begun instrumenting sfq (the highly > technical term for "adding printks everywhere") to figure out what's > going on. Looks like you've got a handle on it, so I'll let you have > at it. Yes, syzbot manages to put a zero in q->scaled_quantum I will send a fix. > > On the brighter side, it seems like Dmitry's and my effort to get full > coverage of WireGuard has paid off in the sense that tons of packets > wind up being shoveled through it in one way or another, which is > good. > Sure !