RE: nfit_test: issue #3: BUG: kernel NULL pointer dereference, address: 0000000000000018

From: "Dorau, Lukasz" <lukasz.dorau@intel.com>
To: "Williams, Dan J" <dan.j.williams@intel.com>
Cc: linux-nvdimm <linux-nvdimm@lists.01.org>
Subject: RE: nfit_test: issue #3: BUG: kernel NULL pointer dereference, address: 0000000000000018
Date: Tue, 17 Mar 2020 09:09:07 +0000	[thread overview]
Message-ID: <SN6PR11MB286403BE843E5B13813825E396F60@SN6PR11MB2864.namprd11.prod.outlook.com> (raw)
In-Reply-To: <CAPcyv4iAJbZpKYzA5SgGcH+dkPQyHkxgGgufTd_YnSZ5bF_X7A@mail.gmail.com>

On Tuesday, March 17, 2020 9:26 AM Dan Williams <dan.j.williams@intel.com> wrote:
> On Mon, Mar 16, 2020 at 1:58 AM Dorau, Lukasz <lukasz.dorau@intel.com> wrote:
> > The above error:
> >    "nfit_test: Unknown symbol acpi_nfit_test (err -2)"
> > I have hit after having removed the 'nfit_test' module:
> >    $ sudo modprobe -v -r nfit_test
> > and having tried to reinsert it:
> >
> > $ sudo modprobe -v nfit_test
> > insmod /lib/modules/5.6.0-rc1-13504-
> g7b27a8622f80/kernel/drivers/acpi/nfit/nfit.ko.xz
> > insmod /lib/modules/5.6.0-rc1-13504-g7b27a8622f80/extra/test/nfit_test.ko.xz
> > modprobe: ERROR: could not insert 'nfit_test': Unknown symbol in module, or
> unknown parameter (see dmesg)
> >
> > because 'modprobe' has inserted the production version of the 'nfit' driver
> (kernel/drivers/acpi/nfit/nfit.ko.xz)
> > instead of the test one (extra/nfit.ko.xz).
> 
> Right, that's broken, but I'm not sure why.
> 
> >
> > Regarding 'depmod' I have run the following commands to build and install the
> kernel and the modules:
> > $ make
> > $ make M=tools/testing/nvdimm
> > $ sudo make M=tools/testing/nvdimm  modules_install     # ---> it runs depmod
> > $ sudo make modules_install     # ---> it runs depmod
> > $ sudo make install
> 
> What distro? On Fedora rawhide I'm doing the same steps and end up with:

Fedora release 31 (Thirty One)

> 
> # cat /lib/modules/$(uname -r)/modules.dep | grep nfit_test.ko
> extra/test/nfit_test.ko: extra/dax_pmem.ko extra/dax_pmem_core.ko
> extra/device_dax.ko extra/nd_pmem.ko extra/nd_btt.ko extra/nfit.ko
> extra/libnvdimm.ko
> kernel/security/keys/encrypted-keys/encrypted-keys.ko
> kernel/security/keys/trusted-keys/trusted.ko
> extra/test/nfit_test_iomap.ko kernel/drivers/char/tpm/tpm.ko
> 
> ...i.e. the test version "extra/nfit.ko" in the dependency chain.

On Fedora release 31 (Thirty One) I have the production version ("kernel/drivers/acpi/nfit/nfit.ko.xz") in the dependency chain:

$ cat /lib/modules/5.6.0-rc1-13504-g7b27a8622f80/modules.dep | grep nfit_test.ko
extra/test/nfit_test.ko.xz: extra/test/nfit_test_iomap.ko.xz kernel/drivers/acpi/nfit/nfit.ko.xz kernel/drivers/nvdimm/libnvdimm.ko.xz kernel/security/keys/encrypted-keys/encrypted-keys.ko.xz kernel/security/keys/trusted-keys/trusted.ko.xz kernel/drivers/char/tpm/tpm.ko.xz kernel/drivers/char/hw_random/rng-core.ko.xz

I do not want to use Fedora rawhide, because AFAIK ndctl does not compile on it.
All I need now is to know the distro & kernel the 'nfit_test' module works well with.
Do you know them? 

--
Lukasz

_______________________________________________
Linux-nvdimm mailing list -- linux-nvdimm@lists.01.org
To unsubscribe send an email to linux-nvdimm-leave@lists.01.org