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From: kernel test robot <lkp@intel.com>
To: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Cc: kbuild-all@lists.01.org, Johannes Weiner <hannes@cmpxchg.org>,
	Andrew Morton <akpm@linux-foundation.org>,
	Linux Memory Management List <linux-mm@kvack.org>
Subject: [mmotm:master 106/260] include/linux/spinlock.h:378:9: sparse: sparse: context imbalance in 'dump_tasks' - unexpected unlock
Date: Sun, 28 Jun 2020 12:09:45 +0800	[thread overview]
Message-ID: <202006281234.JidtY0c9%lkp@intel.com> (raw)

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tree:   git://git.cmpxchg.org/linux-mmotm.git master
head:   89331b857195aa00660fb19f1383924e95f7709e
commit: 57cfa5e82e8d30fd8532f606df1d77c1408cf97d [106/260] mm, oom: avoid printk() iteration under RCU
config: arm-randconfig-s031-20200628 (attached as .config)
compiler: arm-linux-gnueabi-gcc (GCC) 9.3.0
reproduce:
        # apt-get install sparse
        # sparse version: v0.6.2-dirty
        git checkout 57cfa5e82e8d30fd8532f606df1d77c1408cf97d
        # save the attached .config to linux build tree
        make W=1 C=1 ARCH=arm CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__'

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 >>)

   include/linux/rcupdate.h:642:9: sparse: sparse: context imbalance in 'find_lock_task_mm' - wrong count at exit
   include/linux/sched/mm.h:166:37: sparse: sparse: dereference of noderef expression
   include/linux/spinlock.h:378:9: sparse: sparse: context imbalance in 'oom_badness' - unexpected unlock
>> include/linux/spinlock.h:378:9: sparse: sparse: context imbalance in 'dump_tasks' - unexpected unlock
   include/linux/rcupdate.h:644:9: sparse: sparse: context imbalance in '__oom_kill_process' - unexpected unlock

vim +/dump_tasks +378 include/linux/spinlock.h

c2f21ce2e31286 Thomas Gleixner 2009-12-02  375  
3490565b633c70 Denys Vlasenko  2015-07-13  376  static __always_inline void spin_unlock(spinlock_t *lock)
c2f21ce2e31286 Thomas Gleixner 2009-12-02  377  {
c2f21ce2e31286 Thomas Gleixner 2009-12-02 @378  	raw_spin_unlock(&lock->rlock);
c2f21ce2e31286 Thomas Gleixner 2009-12-02  379  }
c2f21ce2e31286 Thomas Gleixner 2009-12-02  380  

:::::: The code at line 378 was first introduced by commit
:::::: c2f21ce2e31286a0a32f8da0a7856e9ca1122ef3 locking: Implement new raw_spinlock

:::::: TO: Thomas Gleixner <tglx@linutronix.de>
:::::: CC: Thomas Gleixner <tglx@linutronix.de>

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

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WARNING: multiple messages have this Message-ID (diff)
From: kernel test robot <lkp@intel.com>
To: kbuild-all@lists.01.org
Subject: [mmotm:master 106/260] include/linux/spinlock.h:378:9: sparse: sparse: context imbalance in 'dump_tasks' - unexpected unlock
Date: Sun, 28 Jun 2020 12:09:45 +0800	[thread overview]
Message-ID: <202006281234.JidtY0c9%lkp@intel.com> (raw)

[-- Attachment #1: Type: text/plain, Size: 2095 bytes --]

tree:   git://git.cmpxchg.org/linux-mmotm.git master
head:   89331b857195aa00660fb19f1383924e95f7709e
commit: 57cfa5e82e8d30fd8532f606df1d77c1408cf97d [106/260] mm, oom: avoid printk() iteration under RCU
config: arm-randconfig-s031-20200628 (attached as .config)
compiler: arm-linux-gnueabi-gcc (GCC) 9.3.0
reproduce:
        # apt-get install sparse
        # sparse version: v0.6.2-dirty
        git checkout 57cfa5e82e8d30fd8532f606df1d77c1408cf97d
        # save the attached .config to linux build tree
        make W=1 C=1 ARCH=arm CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__'

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 >>)

   include/linux/rcupdate.h:642:9: sparse: sparse: context imbalance in 'find_lock_task_mm' - wrong count at exit
   include/linux/sched/mm.h:166:37: sparse: sparse: dereference of noderef expression
   include/linux/spinlock.h:378:9: sparse: sparse: context imbalance in 'oom_badness' - unexpected unlock
>> include/linux/spinlock.h:378:9: sparse: sparse: context imbalance in 'dump_tasks' - unexpected unlock
   include/linux/rcupdate.h:644:9: sparse: sparse: context imbalance in '__oom_kill_process' - unexpected unlock

vim +/dump_tasks +378 include/linux/spinlock.h

c2f21ce2e31286 Thomas Gleixner 2009-12-02  375  
3490565b633c70 Denys Vlasenko  2015-07-13  376  static __always_inline void spin_unlock(spinlock_t *lock)
c2f21ce2e31286 Thomas Gleixner 2009-12-02  377  {
c2f21ce2e31286 Thomas Gleixner 2009-12-02 @378  	raw_spin_unlock(&lock->rlock);
c2f21ce2e31286 Thomas Gleixner 2009-12-02  379  }
c2f21ce2e31286 Thomas Gleixner 2009-12-02  380  

:::::: The code at line 378 was first introduced by commit
:::::: c2f21ce2e31286a0a32f8da0a7856e9ca1122ef3 locking: Implement new raw_spinlock

:::::: TO: Thomas Gleixner <tglx@linutronix.de>
:::::: CC: Thomas Gleixner <tglx@linutronix.de>

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

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             reply	other threads:[~2020-06-28  4:10 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-06-28  4:09 kernel test robot [this message]
2020-06-28  4:09 ` [mmotm:master 106/260] include/linux/spinlock.h:378:9: sparse: sparse: context imbalance in 'dump_tasks' - unexpected unlock kernel test robot
  -- strict thread matches above, loose matches on Subject: below --
2020-08-11  9:48 kernel test robot
2020-08-11  9:48 ` kernel test robot
2020-06-14 14:47 kernel test robot
2020-06-14 14:47 ` kernel test robot

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