include/linux/rwlock_api_smp.h:251:30: sparse: sparse: context imbalance in 'ip6_mc_msfilter'

* include/linux/rwlock_api_smp.h:251:30: sparse: sparse: context imbalance in 'ip6_mc_msfilter' - unexpected unlock
@ 2020-10-30  5:43 kernel test robot
  0 siblings, 0 replies; 4+ messages in thread
From: kernel test robot @ 2020-10-30  5:43 UTC (permalink / raw)
  To: kbuild

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CC: kbuild-all(a)lists.01.org
CC: linux-kernel(a)vger.kernel.org
TO: Amit Daniel Kachhap <amit.kachhap@arm.com>
CC: Will Deacon <will@kernel.org>

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   07e0887302450a62f51dba72df6afb5fabb23d1c
commit: 203b1152d18c04823f73b843eb3b0ad646e4dbb2 arm64/crash_core: Export KERNELPACMASK in vmcoreinfo
date:   6 months ago
:::::: branch date: 10 hours ago
:::::: commit date: 6 months ago
config: arm64-randconfig-s032-20201028 (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: v0.6.3-56-gc09e8239-dirty
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=203b1152d18c04823f73b843eb3b0ad646e4dbb2
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout 203b1152d18c04823f73b843eb3b0ad646e4dbb2
        # 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@intel.com>


"sparse warnings: (new ones prefixed by >>)"
   net/ipv6/mcast.c: note: in included file:
   include/net/mld.h:32:43: sparse: sparse: array of flexible structures
   net/ipv6/mcast.c:259:25: sparse: sparse: context imbalance in 'ip6_mc_find_dev_rcu' - different lock contexts for basic block
   net/ipv6/mcast.c:453:9: sparse: sparse: context imbalance in 'ip6_mc_source' - unexpected unlock
   net/ipv6/mcast.c: note: in included file (through include/linux/spinlock_api_smp.h, include/linux/spinlock.h, include/linux/seqlock.h, ...):
>> include/linux/rwlock_api_smp.h:251:30: sparse: sparse: context imbalance in 'ip6_mc_msfilter' - unexpected unlock
>> include/linux/rwlock_api_smp.h:251:30: sparse: sparse: context imbalance in 'ip6_mc_msfget' - unexpected unlock
   net/ipv6/mcast.c:2704:25: sparse: sparse: context imbalance in 'igmp6_mc_get_next' - unexpected unlock
   net/ipv6/mcast.c:2726:9: sparse: sparse: context imbalance in 'igmp6_mc_get_idx' - wrong count at exit
   net/ipv6/mcast.c:2753:9: sparse: sparse: context imbalance in 'igmp6_mc_seq_stop' - unexpected unlock
   net/ipv6/mcast.c:2825:31: sparse: sparse: context imbalance in 'igmp6_mcf_get_next' - unexpected unlock
   net/ipv6/mcast.c:2857:9: sparse: sparse: context imbalance in 'igmp6_mcf_get_idx' - wrong count at exit
   net/ipv6/mcast.c:2874:9: sparse: sparse: context imbalance in 'igmp6_mcf_seq_next' - wrong count at exit
   net/ipv6/mcast.c:2887:17: sparse: sparse: context imbalance in 'igmp6_mcf_seq_stop' - unexpected unlock

vim +/ip6_mc_msfilter +251 include/linux/rwlock_api_smp.h

6b6b4792f89346e Thomas Gleixner 2009-11-16  246  
9c1721aa4994f66 Thomas Gleixner 2009-12-03  247  static inline void __raw_read_unlock_bh(rwlock_t *lock)
6b6b4792f89346e Thomas Gleixner 2009-11-16  248  {
5facae4f3549b5c Qian Cai        2019-09-19  249  	rwlock_release(&lock->dep_map, _RET_IP_);
9828ea9d75c38fe Thomas Gleixner 2009-12-03  250  	do_raw_read_unlock(lock);
9ea4c380066fbe2 Peter Zijlstra  2013-11-19 @251  	__local_bh_enable_ip(_RET_IP_, SOFTIRQ_LOCK_OFFSET);
6b6b4792f89346e Thomas Gleixner 2009-11-16  252  }
6b6b4792f89346e Thomas Gleixner 2009-11-16  253  

:::::: The code at line 251 was first introduced by commit
:::::: 9ea4c380066fbe23fe0da7f4abfabc444f2467f4 locking: Optimize lock_bh functions

:::::: TO: Peter Zijlstra <peterz@infradead.org>
:::::: CC: Ingo Molnar <mingo@kernel.org>

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

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