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=-8.6 required=3.0 tests=DKIMWL_WL_MED,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_PASS,USER_IN_DEF_DKIM_WL 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 D5008C43381 for ; Mon, 11 Mar 2019 13:45:59 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 9E025206BA for ; Mon, 11 Mar 2019 13:45:59 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="NRR0RRm+" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727385AbfCKNp7 (ORCPT ); Mon, 11 Mar 2019 09:45:59 -0400 Received: from mail-it1-f194.google.com ([209.85.166.194]:55139 "EHLO mail-it1-f194.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726592AbfCKNp6 (ORCPT ); Mon, 11 Mar 2019 09:45:58 -0400 Received: by mail-it1-f194.google.com with SMTP id w18so7291159itj.4 for ; Mon, 11 Mar 2019 06:45:58 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=dGbWLAbGdP2dt1Ji3sFEPy8nE5bOi94Sx8Q7SdZwl/c=; b=NRR0RRm+ucm6/fH9ki6PCN5ENjumfQYH8+I0VgBNcGtemaAAXStSSGbUujjdHOoryL bkUammXLthZRhu/QTwxQS4EErohWxAmbLw5TB6SFdH63/n4V+ic73Tl7hV1qTCeJlRsu TehzqO3KGyVnJ9MOX+NGHCmDN7g4RujGyUGxFbokgrt/xyUV0pciyEwkaPO5cg6OuSBo gLdoY00fmc49rMIpfVfOHTmJWWXILKMbuX6saNYFfBufX+4wtp3T2shg1dESRUN8QQvA Nb2EeZ6RP05SXGbI7UEvLnBj4EQoH41smObU/cRSwOzeL7LRPZ6cHkI6LggF8bsCJsAW E97Q== 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=dGbWLAbGdP2dt1Ji3sFEPy8nE5bOi94Sx8Q7SdZwl/c=; b=eIBNtSEEyNsQwrfUGPTF+EbSKr2dLutr/9TpylIct5xz9GmCmvRU1dUXVH05zZOuVu wsou3WD8jVIbm8pmDC7IV6faUsZknlbf6YC14tw0ItGkuwJCHyo17GLvfTTHwgLZJ81o rUBlqHblLh6fxuRM5u1iPOts5J8UpLfZhKtLODomfxSOR7mTYCvvXA2VwhOCNjQMD0cj Xmut+n5qiD1RAudXLDQX8O9zULIuWPOJQRKRxPodXfe4dWJvLlqyxgXLb1+Zehy1T6i7 OTAtFUXbgRV/LrUgdxXOz2FvlXHd+7K0S/pMeQUxYcaZkWDcdHlnd6KKDyD+rPXLUwFI ESow== X-Gm-Message-State: APjAAAVBRBVg47/oQubN8hd6xLQuJo2iJ4wg8k31IzCc+L1DcVnTLuu+ pZfh3bleva72AgB3AgTNgkzP8FvEQum4HRnAQppbBA== X-Google-Smtp-Source: APXvYqxkfVD+fyyD9HI6O9hePZoEpcmVhlshwb5kiC2YUCuwoZaevjuenVggrhxR0GdtbN91uUlFb8sLSFMKmZy+NmI= X-Received: by 2002:a02:5986:: with SMTP id v6mr1657341jad.35.1552311957696; Mon, 11 Mar 2019 06:45:57 -0700 (PDT) MIME-Version: 1.0 References: <0000000000008f34570583d15823@google.com> <0ded99b8d69a74c260f3f44f5ae1ab59@suse.de> In-Reply-To: <0ded99b8d69a74c260f3f44f5ae1ab59@suse.de> From: Dmitry Vyukov Date: Mon, 11 Mar 2019 14:45:46 +0100 Message-ID: Subject: Re: WARNING in ep_poll_callback To: Roman Penyaev Cc: Andrew Morton , dbueso@suse.de, Jason Baron , linux-fsdevel , LKML , Paul McKenney , Stephen Rothwell , syzkaller-bugs , Al Viro Content-Type: text/plain; charset="UTF-8" Sender: linux-fsdevel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org On Mon, Mar 11, 2019 at 2:37 PM Roman Penyaev wrote: > > Hi Andrew, > > I thought "epoll: loosen irq safety in ep_poll_callback()" patch was > removed from your tree, at least I got a notification on 9th of january, > also I do not see it in the linux-next tree. > > Should I ignore this syzbot message? If this was resolved we need to communicate it to syzbot one way or the other. Since it was in linux-next, it won't even be able to do fix bisection. So the bug will be open forever otherwise. > -- > Roman > > On 2019-03-11 14:14, syzbot wrote: > > syzbot has bisected this bug to: > > > > commit f92cacf118171208f62519d92502a8dd0341286d > > Author: Roman Penyaev > > Date: Tue Jan 8 01:15:44 2019 +0000 > > > > epoll: loosen irq safety in ep_poll_callback() > > > > bisection log: > > https://syzkaller.appspot.com/x/bisect.txt?x=107ae15f200000 > > start commit: f92cacf1 epoll: loosen irq safety in ep_poll_callback() > > git tree: linux-next > > final crash: > > https://syzkaller.appspot.com/x/report.txt?x=127ae15f200000 > > console output: > > https://syzkaller.appspot.com/x/log.txt?x=147ae15f200000 > > kernel config: > > https://syzkaller.appspot.com/x/.config?x=1521b074ff5a5bdf > > dashboard link: > > https://syzkaller.appspot.com/bug?extid=aea82bf9ee6ffd9a79d9 > > userspace arch: amd64 > > syz repro: > > https://syzkaller.appspot.com/x/repro.syz?x=1776034b400000 > > C reproducer: > > https://syzkaller.appspot.com/x/repro.c?x=14c2e580c00000 > > > > Reported-by: syzbot+aea82bf9ee6ffd9a79d9@syzkaller.appspotmail.com > > Fixes: f92cacf1 ("epoll: loosen irq safety in ep_poll_callback()") > > >