tree: https://git.kernel.org/pub/scm/linux/kernel/git/sashal/linux-stable.git queue-4.19 head: 2fa1d7f2ce3cf358f01aed3043d2c325aa9167e7 commit: eb5aef6d9f1c964f93295c9c28a698805f7c440b [12/18] nvme: register ns_id attributes as default sysfs groups config: x86_64-randconfig-s021-20210307 (attached as .config) compiler: gcc-9 (Debian 9.3.0-22) 9.3.0 reproduce: # apt-get install sparse # sparse version: v0.6.3-245-gacc5c298-dirty # https://git.kernel.org/pub/scm/linux/kernel/git/sashal/linux-stable.git/c... git remote add sashal-linux-stable https://git.kernel.org/pub/scm/linux/kernel/git/sashal/linux-stable.git git fetch --no-tags sashal-linux-stable queue-4.19 git checkout eb5aef6d9f1c964f93295c9c28a698805f7c440b # save the attached .config to linux build tree make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=x86_64 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; "sparse warnings: (new ones prefixed by >>)" drivers/nvme/host/core.c:1317:23: sparse: sparse: context imbalance in 'nvme_get_ns_from_disk' - wrong count at exit drivers/nvme/host/core.c:1340:33: sparse: sparse: context imbalance in 'nvme_put_ns_from_disk' - unexpected unlock Please review and possibly fold the followup patch. --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org