Received: by 2002:ac0:a5a7:0:0:0:0:0 with SMTP id m36-v6csp611794imm; Mon, 9 Jul 2018 07:37:47 -0700 (PDT) X-Google-Smtp-Source: AAOMgpdM9neA4bd9D8Tydjkpt9Ur+JsiFykaOIxzwZTHbGHxLkWVKLvEVE+2DD1LFqPqqovTu0+P X-Received: by 2002:a62:1089:: with SMTP id 9-v6mr20413194pfq.30.1531147067720; Mon, 09 Jul 2018 07:37:47 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1531147067; cv=none; d=google.com; s=arc-20160816; b=MYJJ9NfwPjn6jz7f7gdHWypcV7J5Esa+MYBLRBax6MhK4ucMtP1uF9mSJBji3VilHM LMXGUhAhL8J/dDEOjqqD7n7V1mMTWetOaByP0ocn1muxVYoXbX5kSOYitYS68qjJA3in /uCEfkbItwGMhpOWMNOs4+caRdE6gR3LTPgm3kCsAsICKp+d8uFO7InqoQZOImVgESHI 7Zl6S4SBVY40Bgt8kuNc3ncydNyGJzSwugQhEFdPlcBQJxu5nOdg5nNPb0MVYXulF4b1 CdI+HktpG8g+xFbazDHVLnxI/33K6XTb8O6z2ydulxVijhoQ7esHBGqGD/KhfaQTVqZb eWjw== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:sender:user-agent:in-reply-to :content-disposition:mime-version:references:message-id:subject:cc :to:from:date:dkim-signature:arc-authentication-results; bh=do65+p/1fwKe/HUlk44JmPxnFidFLJM3iwwMNZoCfDc=; b=TeKvZrgi3R5H3ymGmwW+C5fnuFajhWOozmxyRkZ2auefC0cCnM9skz1EGr09GGAI+G ghTxwDlNBy04ny2yhaNMaaaP4JT7P4QBhtfu1C8FiCBFSbM2T5pFCC/ctvl+J26LDLC2 xo3Fa7XA4UzpjyB5hQEquVVw4Gh8FnlVNm+JNRu1+bGqjSqbvkt+RiUqzwQ1yLGkd92r k1scqEa/qMcJyFBaF0bI3bwvbh95hIA35lVT6WHo1SYAvz9YT0RY0ajAOY/ySUSL4Qat JVv1hdD4T+2Ap9P/Y8dXOih/nGE0uDPBFwevpOge7/pXUOhhP4iLQgjrrx/d47hYDh0x RL1w== ARC-Authentication-Results: i=1; mx.google.com; dkim=fail header.i=@infradead.org header.s=bombadil.20170209 header.b=FDLxTc3F; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id w15-v6si12225916pga.30.2018.07.09.07.37.33; Mon, 09 Jul 2018 07:37:47 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; dkim=fail header.i=@infradead.org header.s=bombadil.20170209 header.b=FDLxTc3F; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932998AbeGIOgM (ORCPT + 99 others); Mon, 9 Jul 2018 10:36:12 -0400 Received: from bombadil.infradead.org ([198.137.202.133]:58538 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932633AbeGIOgL (ORCPT ); Mon, 9 Jul 2018 10:36:11 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20170209; h=In-Reply-To:Content-Type:MIME-Version :References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id: List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=do65+p/1fwKe/HUlk44JmPxnFidFLJM3iwwMNZoCfDc=; b=FDLxTc3FRzszE3tHxEjpVzdJV 2eKLlUgx/tLtsbR0tCKDEkHI31oBNVKY0hd8zuB+W3bUz4h0NmdmIaIWP++Or82xdKYGED8FB/+YT bOmx4xXXQZPkcjmMJPrTA7t4GP45Ij8QLkWmUgfaftui4+nqk9lwE7ASPWmDfnKSxjK3sPfwVXqrC UzIZWeyFu/b12Gv0tqGYoVMj4nEL7yp1FIFnT85pudSSaFtSLEW8F/uQeINaWyzWxdrc/M7Eh3JEJ vq7g1MKU9VN/kQXHuLK9SY4U464BWUt/e7Y90BSA1YCk4xWxZ7ld0ttiZC6lqmKryizwsMWNWAOc7 Ay2weGF/Q==; Received: from willy by bombadil.infradead.org with local (Exim 4.90_1 #2 (Red Hat Linux)) id 1fcXGs-00057E-7I; Mon, 09 Jul 2018 14:36:10 +0000 Date: Mon, 9 Jul 2018 07:36:10 -0700 From: Matthew Wilcox To: syzbot Cc: hughd@google.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, syzkaller-bugs@googlegroups.com Subject: Re: kernel BUG at mm/shmem.c:LINE! Message-ID: <20180709143610.GD2662@bombadil.infradead.org> References: <000000000000d624c605705e9010@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <000000000000d624c605705e9010@google.com> User-Agent: Mutt/1.9.2 (2017-12-15) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, Jul 06, 2018 at 06:19:02PM -0700, syzbot wrote: > Hello, > > syzbot found the following crash on: > > HEAD commit: 526674536360 Add linux-next specific files for 20180706 > git tree: linux-next > console output: https://syzkaller.appspot.com/x/log.txt?x=116d16fc400000 > kernel config: https://syzkaller.appspot.com/x/.config?x=c8d1cfc0cb798e48 > dashboard link: https://syzkaller.appspot.com/bug?extid=b8e0dfee3fd8c9012771 > compiler: gcc (GCC) 8.0.1 20180413 (experimental) > syzkaller repro:https://syzkaller.appspot.com/x/repro.syz?x=170e462c400000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=15f1ba2c400000 > > IMPORTANT: if you fix the bug, please add the following tag to the commit: > Reported-by: syzbot+b8e0dfee3fd8c9012771@syzkaller.appspotmail.com #syz fix: shmem: Convert shmem_add_to_page_cache to XArray