Hi Linus, please pull from: git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm libnvdimm-fixes
...to receive a crash fix and corresponding regression test enabling for the crash scenario. The unit test for this crash is available in ndctl-v58.2. This branch has received a build success notification from the 0day-kbuild robot over 148 configs. The fix is tagged for -stable / backport to 4.13. --- The following changes since commit 2bd6bf03f4c1c59381d62c61d03f6cc3fe71f66e: Linux 4.14-rc1 (2017-09-16 15:47:51 -0700) are available in the git repository at: git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm libnvdimm-fixes for you to fetch changes up to 33a56086712561b8b9cdc881e0317f4c36861f72: libnvdimm, namespace: fix btt claim class crash (2017-09-18 17:29:01 -0700) ---------------------------------------------------------------- Dan Williams (2): tools/testing/nvdimm: disable labels for nfit_test.1 libnvdimm, namespace: fix btt claim class crash drivers/nvdimm/namespace_devs.c | 9 +++++++++ tools/testing/nvdimm/test/nfit.c | 3 --- 2 files changed, 9 insertions(+), 3 deletions(-) commit 5e75fe3927559505682b0053b5745e3f42d66e8c Author: Dan Williams <dan.j.willi...@intel.com> Date: Mon Sep 18 17:19:10 2017 -0700 tools/testing/nvdimm: disable labels for nfit_test.1 Improve coverage of NVDIMM-N test scenarios by providing a test bus incapable of label operations. Signed-off-by: Dan Williams <dan.j.willi...@intel.com> commit 33a56086712561b8b9cdc881e0317f4c36861f72 Author: Dan Williams <dan.j.willi...@intel.com> Date: Mon Sep 18 14:48:58 2017 -0700 libnvdimm, namespace: fix btt claim class crash Maurice reports: BUG: unable to handle kernel NULL pointer dereference at 0000000000000028 IP: holder_class_store+0x253/0x2b0 [libnvdimm] ...while trying to reconfigure an NVDIMM-N namespace into 'sector' / 'btt' mode. The crash points to this line: (gdb) li *(holder_class_store+0x253) 0x7773 is in holder_class_store (drivers/nvdimm/namespace_devs.c:1420). 1415 for (i = 0; i < nd_region->ndr_mappings; i++) { 1416 struct nd_mapping *nd_mapping = &nd_region->mapping[i]; 1417 struct nvdimm_drvdata *ndd = to_ndd(nd_mapping); 1418 struct nd_namespace_index *nsindex; 1419 1420 nsindex = to_namespace_index(ndd, ndd->ns_current); ...where we are failing because ndd is NULL due to NVDIMM-N dimms not supporting labels. Long story short, default to the BTTv1 format in the label-less / NVDIMM-N case. Fixes: 14e494542636 ("libnvdimm, btt: BTT updates for UEFI 2.7 format") Cc: <sta...@vger.kernel.org> Cc: Vishal Verma <vishal.l.ve...@intel.com> Reported-by: Maurice A. Saldivar <maurice.a.saldi...@hpe.com> Tested-by: Maurice A. Saldivar <maurice.a.saldi...@hpe.com> Signed-off-by: Dan Williams <dan.j.willi...@intel.com>