From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Return-Path: Date: Tue, 13 Jun 2017 06:18:42 +0200 From: Greg Kroah-Hartman To: Logan Gunthorpe Cc: Bjorn Helgaas , kernel test robot , Linus Torvalds , LKP , 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 , wfg@linux.intel.com, Alan Cox , Arnd Bergmann , Linus Walleij , David Airlie , David Herrmann , Daniel Vetter Subject: Re: [Merge tag 'pci-v4.12-changes' of git] 857f864014: BUG: unable to handle kernel NULL pointer dereference at 00000000000000a8 Message-ID: <20170613041842.GA13308@kroah.com> References: <5933fe2d.V33ODGPU9noDVuyF%fengguang.wu@intel.com> <20170606175552.GA12672@bhelgaas-glaptop.roam.corp.google.com> <20170612200852.GA28578@bhelgaas-glaptop.roam.corp.google.com> <61e11e67-6c1b-ef1e-5fb8-a7c9efb17666@deltatee.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii In-Reply-To: <61e11e67-6c1b-ef1e-5fb8-a7c9efb17666@deltatee.com> List-ID: On Mon, Jun 12, 2017 at 05:34:59PM -0600, Logan Gunthorpe wrote: > 1) The test we are looking at is overrunning the dynamic char dev major > numbers by a lot. On a successful run, it gets down to 216 where the > limit is 234. Thus, there are 18 too many major numbers assigned and the > fact that this test used to work is really just luck. (I've cc'd > developers from 49db08c3 for this issue.) 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? thanks, gre gk-h From mboxrd@z Thu Jan 1 00:00:00 1970 Content-Type: multipart/mixed; boundary="===============0821461514454508534==" MIME-Version: 1.0 From: Greg Kroah-Hartman To: lkp@lists.01.org Subject: Re: [Merge tag 'pci-v4.12-changes' of git] 857f864014: BUG: unable to handle kernel NULL pointer dereference at 00000000000000a8 Date: Tue, 13 Jun 2017 06:18:42 +0200 Message-ID: <20170613041842.GA13308@kroah.com> In-Reply-To: <61e11e67-6c1b-ef1e-5fb8-a7c9efb17666@deltatee.com> List-Id: --===============0821461514454508534== Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable On Mon, Jun 12, 2017 at 05:34:59PM -0600, Logan Gunthorpe wrote: > 1) The test we are looking at is overrunning the dynamic char dev major > numbers by a lot. On a successful run, it gets down to 216 where the > limit is 234. Thus, there are 18 too many major numbers assigned and the > fact that this test used to work is really just luck. (I've cc'd > developers from 49db08c3 for this issue.) 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? thanks, gre gk-h --===============0821461514454508534==-- From mboxrd@z Thu Jan 1 00:00:00 1970 From: gregkh@linuxfoundation.org (Greg Kroah-Hartman) Date: Tue, 13 Jun 2017 06:18:42 +0200 Subject: [Merge tag 'pci-v4.12-changes' of git] 857f864014: BUG: unable to handle kernel NULL pointer dereference at 00000000000000a8 In-Reply-To: <61e11e67-6c1b-ef1e-5fb8-a7c9efb17666@deltatee.com> References: <5933fe2d.V33ODGPU9noDVuyF%fengguang.wu@intel.com> <20170606175552.GA12672@bhelgaas-glaptop.roam.corp.google.com> <20170612200852.GA28578@bhelgaas-glaptop.roam.corp.google.com> <61e11e67-6c1b-ef1e-5fb8-a7c9efb17666@deltatee.com> Message-ID: <20170613041842.GA13308@kroah.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On Mon, Jun 12, 2017 at 05:34:59PM -0600, Logan Gunthorpe wrote: > 1) The test we are looking at is overrunning the dynamic char dev major > numbers by a lot. On a successful run, it gets down to 216 where the > limit is 234. Thus, there are 18 too many major numbers assigned and the > fact that this test used to work is really just luck. (I've cc'd > developers from 49db08c3 for this issue.) 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? thanks, gre gk-h