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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 61430C6FD1D for ; Tue, 21 Mar 2023 15:44:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231732AbjCUPn7 (ORCPT ); Tue, 21 Mar 2023 11:43:59 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53376 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231817AbjCUPni (ORCPT ); Tue, 21 Mar 2023 11:43:38 -0400 Received: from mail-vs1-xe2a.google.com (mail-vs1-xe2a.google.com [IPv6:2607:f8b0:4864:20::e2a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 4EE4A2BEDF for ; Tue, 21 Mar 2023 08:43:34 -0700 (PDT) Received: by mail-vs1-xe2a.google.com with SMTP id cu36so5065127vsb.7 for ; Tue, 21 Mar 2023 08:43:34 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; t=1679413413; h=content-transfer-encoding:cc:to:subject:message-id:date:from :in-reply-to:references:mime-version:from:to:cc:subject:date :message-id:reply-to; bh=Y00xZTMnW/WazbGdbgQrBycDfNcdSIYV3Mj2B7uLQTc=; b=sPFXiF51FOiH1Az8z8W3OFjCkyrxHA+rMnCni2Cfh0p1HCJTcba1loA9m5PGDrcBXG 9m+0Pa72K/zYMdNxB8WA+Ea5uLprRi5MKyVdqgvc9IcEHQVbziqDVOwZSF2SEwWHvJFp wdlm2p8YJ0yvelTRL6Yg5tRI+T08JHaput8IFf1Lo5momgM1EGsA4BansylobRI3ESf+ /nOllXRmzQzan52DN49tMCrAZ7utbT7p3Xz3sYSK5e5GOJ4iD+p7oRFZMxF4WGxF/DYD DzfJwrC9q726iq7rpNhtVrAnraybW2odx9sG8zE/vhT/Oi4qHerQ+cP2j28uOWuNSft4 AUEg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; t=1679413413; h=content-transfer-encoding:cc:to:subject:message-id:date:from :in-reply-to:references:mime-version:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=Y00xZTMnW/WazbGdbgQrBycDfNcdSIYV3Mj2B7uLQTc=; b=YtQvA47IfIYsYpnlH66FRbZ6U6gGNRJ0TVRrBHDHmOJbPo5bdecjcY/pUvojlfWg9/ eRQCIIfQy7u1/noUOX1EcbMk8y2feqskw1JQau1pWTHTDvFRuea6Wd2MzTceFDeQC4Br nFBFrSiCeVSjtlT9ySMDUaAWrxr04e9rwsXzcSqos+ogVhxx0QV7enzxaLEncWcd0qMD M32mTPC0NnJKHQqVxDgCQ6qpI5i0BaDUiqRw9NhsDy+hJUOxSyopXCAQZccC5Gif5zvs FgpoMouImfX2nixgh7aP84CYAfQ/jXdVzTOW7gdD1PwFZfO38yibERQA+TL8M5qnGm/1 W+Uw== X-Gm-Message-State: AAQBX9cwFez7bNEjs/fg+OmdYlFTYzjFQqDtqNiQSVrk2hOtPBv3d3En M+wnF0metOLzCr3fug4RNoyUyfq9HK80Bctf0a/VWg== X-Google-Smtp-Source: AK7set+uE31fRevBboLUAiIpZN5iCBwZ5X84oVwutDcKQH0rj2bO1OlFmwPCvwxrPKza1UPYQ2We10CceECf7Oyd3pc= X-Received: by 2002:a67:d891:0:b0:425:b38b:650 with SMTP id f17-20020a67d891000000b00425b38b0650mr1896281vsj.7.1679413412722; Tue, 21 Mar 2023 08:43:32 -0700 (PDT) MIME-Version: 1.0 References: <26269528616bb41dcb2b5a3314f87fb36d45acac.camel@redhat.com> In-Reply-To: <26269528616bb41dcb2b5a3314f87fb36d45acac.camel@redhat.com> From: Eric Dumazet Date: Tue, 21 Mar 2023 08:43:20 -0700 Message-ID: Subject: Re: syzbot + epoll To: Paolo Abeni Cc: LKML , Xiumei Mu , Jacob Keller , Soheil Hassas Yeganeh , Andrew Morton , Hillf Danton Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Mar 21, 2023 at 8:20=E2=80=AFAM Paolo Abeni wro= te: > (adding Hillf, as was looking to this issue, too) > > The fix LGTM and syzkaller says it addresses the issue: > > https://groups.google.com/g/syzkaller-bugs/c/oiBUmGsqz_Q/m/1IQ4vbROAgAJ > > I see Andrew removed the patch from the -mm tree. I guess at this point > a new version of "epoll: use refcount to reduce ep_mutex contention", > including the above is needed? > > If the above is correct, would a co-devel tag fit you Eric? Squashing patches make sense for sure, thanks.