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=-18.3 required=3.0 tests=BAYES_00,DKIMWL_WL_MED, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING,SPF_HELO_NONE,SPF_PASS, USER_IN_DEF_DKIM_WL autolearn=unavailable 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 95E53C433EF for ; Thu, 16 Sep 2021 08:00:02 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 76ABF61207 for ; Thu, 16 Sep 2021 08:00:02 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234932AbhIPIBV (ORCPT ); Thu, 16 Sep 2021 04:01:21 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42186 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234900AbhIPIBV (ORCPT ); Thu, 16 Sep 2021 04:01:21 -0400 Received: from mail-oo1-xc35.google.com (mail-oo1-xc35.google.com [IPv6:2607:f8b0:4864:20::c35]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 0676BC061574 for ; Thu, 16 Sep 2021 01:00:01 -0700 (PDT) Received: by mail-oo1-xc35.google.com with SMTP id v20-20020a4a2554000000b0028f8cc17378so1825517ooe.0 for ; Thu, 16 Sep 2021 01:00:00 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=93zx3vU1aklDWU/pl0rAprDMWU2o0pwv4FUA4FyOCAc=; b=Nh3thr9/uwyT4GqeuZdCadhw3TTv9l0fUkLi4cddtGIVWB/kSoHsl8RTQbXDy5GtT6 wjIzSY6/nzhY3Fc7vPfgHXDXQlFjS38SbEqO52gLhY7c0UBT72zY3Y6nYK4JTwqzCZI/ qFwoCHIJM81r1ojcjumVtghzPeYlmah802j9eAtxSnxipUWOoeU1WYA9BYbiUblowCll ru/hes4cVP8nQnR1HUMMazk26L/mC97CFDZhAjxqVBDhpE18Dbm6V6s+ot1wnykLKzV9 S7V+FTjKBAIyAND6vb6Y5jSEpeAi0x/tYu1olh4Nm76fhsHdzEfKzLkfzENxcf7P6UAB YHww== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=93zx3vU1aklDWU/pl0rAprDMWU2o0pwv4FUA4FyOCAc=; b=02+muvgA48BdRP+qwxfjoTYNnfA+aeNpBD1DaPCxYV28gWMCZ6/mRgocos30ejq+Gz irJqTi6TNUjmZiC45vxeKF6ZxTO0LIf5iulyN8xn+TMYaC8FUnWz/pi64EyxuBJQ/HX+ 9kFAJ/l38236dJvecvaaqZJy7KGeMnpaHgik7Z6O/ZUZ91LC8LlgMb939l3KY4roc5aK xmwbxSLht7WPern9MwGqv/TwThZWA1CXn2opLWst6Ya+gcTSFmx/SpGcVRuzf/Xi0GiD CM28iSj3+Mp/tJoX7cn2xj9uq94XnqhNkarBGm9sPaHE4L1RUpUjWuTxbr+6Q3a3X1yq YV2g== X-Gm-Message-State: AOAM530pWmtmmn7hKEbxNAG9UqqTYAq9rDrMNzZOMOOF8OZQVAmL/Npv 9ewBeZ/7o54rof58WJXi6eVKlv2I6Ck9J6I1WdVU3g== X-Google-Smtp-Source: ABdhPJx9WYkZtAm+l9hmPej8DdPKD0lNlKUA5YclHnJHZua1+FIPkm8muONXSS2oM1OJ+gYUhz1mA/ik1Z98A1nQUt4= X-Received: by 2002:a4a:e792:: with SMTP id x18mr3298706oov.53.1631779199332; Thu, 16 Sep 2021 00:59:59 -0700 (PDT) MIME-Version: 1.0 References: <0000000000006e9e0705bd91f762@google.com> <0000000000006ab57905cbdd002c@google.com> In-Reply-To: <0000000000006ab57905cbdd002c@google.com> From: Dmitry Vyukov Date: Thu, 16 Sep 2021 09:59:48 +0200 Message-ID: Subject: Re: [syzbot] WARNING in __percpu_ref_exit (2) To: syzbot Cc: asml.silence@gmail.com, axboe@kernel.dk, coreteam@netfilter.org, davem@davemloft.net, dsahern@kernel.org, fw@strlen.de, hdanton@sina.com, io-uring@vger.kernel.org, kadlec@netfilter.org, kuba@kernel.org, linux-kernel@vger.kernel.org, ming.lei@redhat.com, netdev@vger.kernel.org, netfilter-devel@vger.kernel.org, pablo@netfilter.org, syzkaller-bugs@googlegroups.com, yoshfuji@linux-ipv6.org Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: io-uring@vger.kernel.org On Mon, 13 Sept 2021 at 11:22, syzbot wrote: > > syzbot suspects this issue was fixed by commit: > > commit 43016d02cf6e46edfc4696452251d34bba0c0435 > Author: Florian Westphal > Date: Mon May 3 11:51:15 2021 +0000 > > netfilter: arptables: use pernet ops struct during unregister > > bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=10acd273300000 > start commit: c98ff1d013d2 Merge tag 'scsi-fixes' of git://git.kernel.or.. > git tree: upstream > kernel config: https://syzkaller.appspot.com/x/.config?x=1c70e618af4c2e92 > dashboard link: https://syzkaller.appspot.com/bug?extid=d6218cb2fae0b2411e9d > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=145cb2b6d00000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=157b72b1d00000 > > If the result looks correct, please mark the issue as fixed by replying with: > > #syz fix: netfilter: arptables: use pernet ops struct during unregister > > For information about bisection process see: https://goo.gl/tpsmEJ#bisection I guess this is a wrong commit and it was fixed by something in io_uring. Searching for refcount fixes I see a298232ee6b9a1d5d732aa497ff8be0d45b5bd82 "io_uring: fix link timeout refs". Pavel, does it look right to you?