tree: https://git.kernel.org/pub/scm/linux/kernel/git/josef/btrfs-next.git locking-rework head: ecc26315fec63c1ce9a1420cb6d9b6e0d0c4d7f5 commit: 061e82bf86d54d981acb307eff1fa114e71c3854 [16/18] btrfs: change our extent buffer lock to a rw_semaphore config: i386-randconfig-s002-20200810 (attached as .config) compiler: gcc-9 (Debian 9.3.0-15) 9.3.0 reproduce: # apt-get install sparse # sparse version: v0.6.2-141-g19506bc2-dirty git checkout 061e82bf86d54d981acb307eff1fa114e71c3854 # save the attached .config to linux build tree make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=i386 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 >>) fs/btrfs/locking.c: note: in included file (through fs/btrfs/ctree.h): fs/btrfs/locking.c:217:6: sparse: sparse: context imbalance in 'btrfs_tree_lock' - wrong count at exit vim +/__btrfs_tree_lock +2066 include/trace/events/btrfs.h 34e73cc930a867 Qu Wenruo 2019-04-15 2065 34e73cc930a867 Qu Wenruo 2019-04-15 @2066 DEFINE_EVENT(btrfs_sleep_tree_lock, btrfs_tree_lock, 34e73cc930a867 Qu Wenruo 2019-04-15 2067 TP_PROTO(const struct extent_buffer *eb, u64 start_ns), 34e73cc930a867 Qu Wenruo 2019-04-15 2068 34e73cc930a867 Qu Wenruo 2019-04-15 2069 TP_ARGS(eb, start_ns) 34e73cc930a867 Qu Wenruo 2019-04-15 2070 ); 34e73cc930a867 Qu Wenruo 2019-04-15 2071 :::::: The code at line 2066 was first introduced by commit :::::: 34e73cc930a8677426c9cbffdd3421e18f32e79f btrfs: trace: Introduce trace events for sleepable tree lock :::::: TO: Qu Wenruo <wqu(a)suse.com&gt; :::::: CC: David Sterba <dsterba(a)suse.com&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org