Return-Path: <linux-kernel-owner@vger.kernel.org>
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
        id S1752396AbdFMEe3 (ORCPT <rfc822;w@1wt.eu>);
        Tue, 13 Jun 2017 00:34:29 -0400
Received: from mail.linuxfoundation.org ([140.211.169.12]:59990 "EHLO
        mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org
        with ESMTP id S1750818AbdFMEe1 (ORCPT
        <rfc822;linux-kernel@vger.kernel.org>);
        Tue, 13 Jun 2017 00:34:27 -0400
Date: Tue, 13 Jun 2017 06:34:16 +0200
From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: Logan Gunthorpe <logang@deltatee.com>
Cc: Bjorn Helgaas <helgaas@kernel.org>,
        kernel test robot <fengguang.wu@intel.com>,
        Linus Torvalds <torvalds@linux-foundation.org>, LKP <lkp@01.org>,
        linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org,
        linux-doc@vger.kernel.org, linux-pci@vger.kernel.org,
        linux-kernel@vger.kernel.org, Bjorn Helgaas <bhelgaas@google.com>,
        wfg@linux.intel.com, Alan Cox <alan@linux.intel.com>,
        Arnd Bergmann <arnd@arndb.de>,
        Linus Walleij <linus.walleij@linaro.org>,
        David Airlie <airlied@linux.ie>,
        David Herrmann <dh.herrmann@gmail.com>,
        Daniel Vetter <daniel.vetter@ffwll.ch>
Subject: Re: [Merge tag 'pci-v4.12-changes' of git] 857f864014: BUG: unable
 to handle kernel NULL pointer dereference at 00000000000000a8
Message-ID: <20170613043416.GB14217@kroah.com>
References: <5933fe2d.V33ODGPU9noDVuyF%fengguang.wu@intel.com>
 <20170606175552.GA12672@bhelgaas-glaptop.roam.corp.google.com>
 <fe0543c1-cba6-02bb-36eb-395910bd5012@deltatee.com>
 <20170612200852.GA28578@bhelgaas-glaptop.roam.corp.google.com>
 <61e11e67-6c1b-ef1e-5fb8-a7c9efb17666@deltatee.com>
 <20170613041842.GA13308@kroah.com>
 <f6322f70-7ca7-abf6-b947-4cbbfd598948@deltatee.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <f6322f70-7ca7-abf6-b947-4cbbfd598948@deltatee.com>
User-Agent: Mutt/1.8.3 (2017-05-23)
Sender: linux-kernel-owner@vger.kernel.org
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org
Content-Length: 777
Lines: 20

On Mon, Jun 12, 2017 at 10:29:20PM -0600, Logan Gunthorpe wrote:
> 
> 
> On 12/06/17 10:18 PM, Greg Kroah-Hartman wrote:
> > What test causes so many major numbers to be allocated?  Is this
> > in-kernel test code?  Do you really have a system that requires so many
> > different drivers that all want a dynamic char major?
> 
> This is a 0day kernel robot test. I'm not sure the motivations of its
> design but it seems to be similar to an allyesconfig. So all/most
> modules are compiled in and allocating their char device regions on boot
> of a qemu instance.

Ah, that makes sense.  Well, someone can always work on expanding the
range of dynamic char major numbers if they are running out of them on a
real system, I'll gladly take patches for that :)

thanks,

greg k-h