tree: https://git.kernel.org/pub/scm/linux/kernel/git/josef/btrfs-next.git zygo-submit head: ae98f2775f4bf9178e8121e3e58fd433db00b6d7 commit: ae98f2775f4bf9178e8121e3e58fd433db00b6d7 [66/66] btrfs: throttle snapshot delete on delayed refs reproduce: # apt-get install sparse # sparse version: git checkout ae98f2775f4bf9178e8121e3e58fd433db00b6d7 make ARCH=x86_64 allmodconfig make C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' If you fix the issue, kindly add following tag Reported-by: kbuild test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): fs/btrfs/locking.c:232:41: sparse: warning: context imbalance in 'btrfs_set_lock_blocking_write' - unexpected unlock fs/btrfs/locking.c:247:6: sparse: warning: context imbalance in 'btrfs_tree_read_lock' - different lock contexts for basic block fs/btrfs/locking.c:288:5: sparse: warning: context imbalance in 'btrfs_tree_read_lock_atomic' - different lock contexts for basic block fs/btrfs/locking.c:310:5: sparse: warning: context imbalance in 'btrfs_try_tree_read_lock' - different lock contexts for basic block fs/btrfs/locking.c:335:5: sparse: warning: context imbalance in 'btrfs_try_tree_write_lock' - different lock contexts for basic block fs/btrfs/locking.c:412:6: sparse: warning: context imbalance in 'btrfs_tree_lock' - wrong count at exit fs/btrfs/locking.c:129:9: sparse: warning: context imbalance in 'btrfs_tree_unlock' - unexpected unlock -- fs/btrfs/extent_io.c:2315:9: sparse: error: incompatible types in comparison expression (different address spaces): fs/btrfs/extent_io.c:2315:9: sparse: struct rcu_string [noderef] <asn:4> * fs/btrfs/extent_io.c:2315:9: sparse: struct rcu_string * include/linux/page-flags.h:174:30: sparse: warning: context imbalance in 'btrfs_release_extent_buffer_pages' - different lock contexts for basic block arch/x86/include/asm/bitops.h:77:37: sparse: warning: cast truncates bits from constant value (ffffff7f becomes 7f) vim +/btrfs_set_lock_blocking_read +38 include/linux/kasan-checks.h 7d8ad890dad00f Marco Elver 2019-07-11 25 7d8ad890dad00f Marco Elver 2019-07-11 26 /* 7d8ad890dad00f Marco Elver 2019-07-11 27 * kasan_check_*: Only available when the particular compilation unit has KASAN 7d8ad890dad00f Marco Elver 2019-07-11 28 * instrumentation enabled. May be used in header files. 7d8ad890dad00f Marco Elver 2019-07-11 29 */ 7d8ad890dad00f Marco Elver 2019-07-11 30 #ifdef __SANITIZE_ADDRESS__ 7d8ad890dad00f Marco Elver 2019-07-11 31 #define kasan_check_read __kasan_check_read 7d8ad890dad00f Marco Elver 2019-07-11 32 #define kasan_check_write __kasan_check_write 64f8ebaf115bcd Andrey Ryabinin 2016-05-20 33 #else b5f6e0fc7d60e0 Marco Elver 2019-07-11 34 static inline bool kasan_check_read(const volatile void *p, unsigned int size) b5f6e0fc7d60e0 Marco Elver 2019-07-11 35 { b5f6e0fc7d60e0 Marco Elver 2019-07-11 36 return true; b5f6e0fc7d60e0 Marco Elver 2019-07-11 37 } b5f6e0fc7d60e0 Marco Elver 2019-07-11 @38 static inline bool kasan_check_write(const volatile void *p, unsigned int size) b5f6e0fc7d60e0 Marco Elver 2019-07-11 39 { b5f6e0fc7d60e0 Marco Elver 2019-07-11 40 return true; b5f6e0fc7d60e0 Marco Elver 2019-07-11 41 } 64f8ebaf115bcd Andrey Ryabinin 2016-05-20 42 #endif 64f8ebaf115bcd Andrey Ryabinin 2016-05-20 43 :::::: The code at line 38 was first introduced by commit :::::: b5f6e0fc7d60e0234dac82498e90dfe9027bad1f mm/kasan: change kasan_check_{read,write} to return boolean :::::: TO: Marco Elver <elver(a)google.com&gt; :::::: CC: Linus Torvalds <torvalds(a)linux-foundation.org&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org