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=-3.7 required=3.0 tests=BAYES_00,FROM_LOCAL_HEX, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED 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 67AA5C433E7 for ; Thu, 8 Oct 2020 20:28:16 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 23D8322227 for ; Thu, 8 Oct 2020 20:28:16 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730373AbgJHU2P (ORCPT ); Thu, 8 Oct 2020 16:28:15 -0400 Received: from mail-io1-f78.google.com ([209.85.166.78]:34487 "EHLO mail-io1-f78.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730369AbgJHU2N (ORCPT ); Thu, 8 Oct 2020 16:28:13 -0400 Received: by mail-io1-f78.google.com with SMTP id y70so4641946iof.1 for ; Thu, 08 Oct 2020 13:28:11 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:date:in-reply-to:message-id:subject :from:to; bh=7y3B3XsOiPTLYLIDns6NguVsL9ucnpw4TXcZn72tI0c=; b=TpzLfWTWgXl92MSUzTwr3sE8B4+2PiLbwd/oYm1J19C/5ttGVF3k0Qm45cGh8UI1sY HKA3d/6nVoecH3BHhGQxWsIVvFR+tA45UlFBIHHOQu526MxPthm3mOhnhrLxDU4+vY/l 6V7095LLfzZe8BR2jV8DeiMMES1a2uJRpYYQApTWqVnGF0BBKRY6vxfbfvLCzbypX+8u O6ZCuanXnH7ag7ezWDMTIB3GjXOJNBzdBgWD2VyoLNSTpvZkyav2s9eFxk7E0ZvxuUUs sK8a18uIZi0lMQhft5r35zc0bJh0OVD1ylH34ae8AlTKCEsrnZVShCvu8QkjhRtpWhSI xWvg== X-Gm-Message-State: AOAM533gvm/bhRjH1qf0CNh43xCQFCmIvozCXyecJ3LWO+jaTOt/S18i TE6g2Kq3R1N+iZPpOmJ3r2xcM2PKQQl/vcLj8beLYKVTR6Cl X-Google-Smtp-Source: ABdhPJxQG7zkhxy1g7ndmakw3pFTvWpidkFGm3ConSOutpg5F4NLy+BDbf/l7aHvxuH3DwXEGuIgtAHY6s+z1objQuaP9/PVvEnF MIME-Version: 1.0 X-Received: by 2002:a92:1f44:: with SMTP id i65mr7622723ile.280.1602188890683; Thu, 08 Oct 2020 13:28:10 -0700 (PDT) Date: Thu, 08 Oct 2020 13:28:10 -0700 In-Reply-To: <00000000000084dcbd05b12a3736@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000b1412b05b12eab0a@google.com> Subject: Re: general protection fault in percpu_ref_exit From: syzbot To: axboe@kernel.dk, bcrl@kvack.org, hch@lst.de, linux-aio@kvack.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, ming.lei@redhat.com, syzkaller-bugs@googlegroups.com, tj@kernel.org, viro@zeniv.linux.org.uk, vkabatov@redhat.com Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org syzbot has bisected this issue to: commit 2b0d3d3e4fcfb19d10f9a82910b8f0f05c56ee3e Author: Ming Lei Date: Thu Oct 1 15:48:41 2020 +0000 percpu_ref: reduce memory footprint of percpu_ref in fast path bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=126930d0500000 start commit: 8b787da7 Add linux-next specific files for 20201007 git tree: linux-next final oops: https://syzkaller.appspot.com/x/report.txt?x=116930d0500000 console output: https://syzkaller.appspot.com/x/log.txt?x=166930d0500000 kernel config: https://syzkaller.appspot.com/x/.config?x=aac055e9c8fbd2b8 dashboard link: https://syzkaller.appspot.com/bug?extid=fd15ff734dace9e16437 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=119a0568500000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=106c0a8b900000 Reported-by: syzbot+fd15ff734dace9e16437@syzkaller.appspotmail.com Fixes: 2b0d3d3e4fcf ("percpu_ref: reduce memory footprint of percpu_ref in fast path") For information about bisection process see: https://goo.gl/tpsmEJ#bisection