tree: git://git.cmpxchg.org/linux-mmotm.git master
head: 89331b857195aa00660fb19f1383924e95f7709e
commit: 57cfa5e82e8d30fd8532f606df1d77c1408cf97d [106/260] mm, oom: avoid printk() iteration under RCU
config: x86_64-randconfig-s021-20200614 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-13) 9.3.0
reproduce:
# apt-get install sparse
# sparse version: v0.6.1-250-g42323db3-dirty
git checkout 57cfa5e82e8d30fd8532f606df1d77c1408cf97d
# save the attached .config to linux build tree
make W=1 C=1 ARCH=x86_64 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__'
If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@xxxxxxxxx>
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@xxxxxxxxxxxxx>
:::::: CC: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx
Attachment:
.config.gz
Description: application/gzip
