linux-kernel - Re: [Merge tag 'pci-v4.12-changes' of git] 857f864014: BUG: unable to handle kernel NULL pointer dereference at 00000000000000a8

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Message-ID: <20170613043518.GA14621@kroah.com>
Date:   Tue, 13 Jun 2017 06:35:18 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Logan Gunthorpe <logang@...tatee.com>
Cc:     Bjorn Helgaas <helgaas@...nel.org>,
        kernel test robot <fengguang.wu@...el.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        LKP <lkp@...org>, linux-arm-kernel@...ts.infradead.org,
        devicetree@...r.kernel.org, linux-doc@...r.kernel.org,
        linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
        Bjorn Helgaas <bhelgaas@...gle.com>, wfg@...ux.intel.com,
        Alan Cox <alan@...ux.intel.com>, Arnd Bergmann <arnd@...db.de>,
        Linus Walleij <linus.walleij@...aro.org>,
        David Airlie <airlied@...ux.ie>,
        David Herrmann <dh.herrmann@...il.com>,
        Daniel Vetter <daniel.vetter@...ll.ch>
Subject: Re: [Merge tag 'pci-v4.12-changes' of git] 857f864014: BUG: unable
 to handle kernel NULL pointer dereference at 00000000000000a8

On Tue, Jun 13, 2017 at 06:34:16AM +0200, Greg Kroah-Hartman wrote:
> 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 :)

Or better yet, just turn all char major allocations into dynamic, which
would be really good for test systems.  I thought someone proposed
patches for that a long time ago, but I can't find them anymore.  That
would be the simplest solution here.

thnaks,

greg k-h