linux-kernel - include/asm-generic/atomic-instrumented.h:193:29: sparse: sparse: context imbalance in 'dn_socket_seq_next'

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Message-ID: <202009022254.UI6rWM4D%lkp@intel.com>
Date:   Wed, 2 Sep 2020 22:19:05 +0800
From:   kernel test robot <lkp@...el.com>
To:     Borislav Petkov <bp@...e.de>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
        Ingo Molnar <mingo@...nel.org>
Subject: include/asm-generic/atomic-instrumented.h:193:29: sparse: sparse:
 context imbalance in 'dn_socket_seq_next' - unexpected unlock

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   9c7d619be5a002ea29c172df5e3c1227c22cbb41
commit: a4654e9bde4ecedb4921e6c8fe2088114bdff1b3 Merge branch 'x86/kdump' into locking/kcsan, to resolve conflicts
date:   6 months ago
config: arm64-randconfig-s031-20200902 (attached as .config)
compiler: aarch64-linux-gcc (GCC) 9.3.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # apt-get install sparse
        # sparse version: v0.6.2-191-g10164920-dirty
        git checkout a4654e9bde4ecedb4921e6c8fe2088114bdff1b3
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=arm64 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@...el.com>


sparse warnings: (new ones prefixed by >>)

   net/decnet/af_decnet.c:249:22: sparse: sparse: incorrect type in assignment (different base types) @@     expected unsigned int hash @@     got restricted __le16 [usertype] sdn_objnamel @@
   net/decnet/af_decnet.c:249:22: sparse:     expected unsigned int hash
   net/decnet/af_decnet.c:249:22: sparse:     got restricted __le16 [usertype] sdn_objnamel
   net/decnet/af_decnet.c: note: in included file:
   include/net/dn.h:192:24: sparse: sparse: incorrect type in assignment (different base types) @@     expected restricted __be16 [usertype] sport @@     got restricted __le16 [usertype] addrloc @@
   include/net/dn.h:192:24: sparse:     expected restricted __be16 [usertype] sport
   include/net/dn.h:192:24: sparse:     got restricted __le16 [usertype] addrloc
   include/net/dn.h:193:24: sparse: sparse: incorrect type in assignment (different base types) @@     expected restricted __be16 [usertype] dport @@     got restricted __le16 [usertype] addrrem @@
   include/net/dn.h:193:24: sparse:     expected restricted __be16 [usertype] dport
   include/net/dn.h:193:24: sparse:     got restricted __le16 [usertype] addrrem
   net/decnet/af_decnet.c:2159:13: sparse: sparse: context imbalance in 'dn_socket_get_idx' - wrong count at exit
   net/decnet/af_decnet.c: note: in included file (through arch/arm64/include/asm/atomic.h, include/linux/atomic.h, include/asm-generic/bitops/atomic.h, ...):
>> include/asm-generic/atomic-instrumented.h:193:29: sparse: sparse: context imbalance in 'dn_socket_seq_next' - unexpected unlock
>> include/asm-generic/atomic-instrumented.h:193:29: sparse: sparse: context imbalance in 'dn_socket_seq_stop' - unexpected unlock

# https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=a4654e9bde4ecedb4921e6c8fe2088114bdff1b3
git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
git fetch --no-tags linus master
git checkout a4654e9bde4ecedb4921e6c8fe2088114bdff1b3
vim +/dn_socket_seq_next +193 include/asm-generic/atomic-instrumented.h

aa525d063851a9 Mark Rutland 2018-09-04  188  
aa525d063851a9 Mark Rutland 2018-09-04  189  #if defined(arch_atomic_sub_return_release)
c020395b6634b7 Marco Elver  2019-11-26  190  static __always_inline int
aa525d063851a9 Mark Rutland 2018-09-04  191  atomic_sub_return_release(int i, atomic_t *v)
aa525d063851a9 Mark Rutland 2018-09-04  192  {
e75a6795ed132f Marco Elver  2019-11-14 @193  	__atomic_check_write(v, sizeof(*v));
aa525d063851a9 Mark Rutland 2018-09-04  194  	return arch_atomic_sub_return_release(i, v);
aa525d063851a9 Mark Rutland 2018-09-04  195  }
aa525d063851a9 Mark Rutland 2018-09-04  196  #define atomic_sub_return_release atomic_sub_return_release
aa525d063851a9 Mark Rutland 2018-09-04  197  #endif
aa525d063851a9 Mark Rutland 2018-09-04  198  

:::::: The code at line 193 was first introduced by commit
:::::: e75a6795ed132f26f69d08dea958630d5993056d locking/atomics, kcsan: Add KCSAN instrumentation

:::::: TO: Marco Elver <elver@...gle.com>
:::::: CC: Paul E. McKenney <paulmck@...nel.org>

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

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