CC: kbuild-all(a)lists.01.org BCC: lkp(a)intel.com CC: linux-kernel(a)vger.kernel.org TO: Vlastimil Babka <vbabka(a)suse.cz&gt; CC: Roman Gushchin <guro(a)fb.com&gt; CC: Hyeonggon Yoo <42.hyeyoo(a)gmail.com&gt; tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 787af64d05cd528aac9ad16752d11bb1c6061bb9 commit: 401fb12c68c257b9c9116b1475c0ac26b646fcc0 mm/sl*b: Differentiate struct slab fields by sl*b implementations date: 3 months ago :::::: branch date: 19 hours ago :::::: commit date: 3 months ago compiler: or1k-linux-gcc (GCC) 11.2.0 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; cppcheck possible warnings: (new ones prefixed by >>, may not real problems) mm/slab_common.c:187:48: warning: Parameter 'ctor' can be declared with const [constParameter] slab_flags_t flags, const char *name, void (*ctor)(void *)) ^ debugfs_slab_release(s); ^ mm/slab_common.c:437:16: note: Assuming condition is false if (list_empty(&to_destroy)) ^ mm/slab_common.c:437:16: note: Assuming condition is false if (list_empty(&to_destroy)) ^ mm/slab_common.c:437:16: note: Assuming condition is false if (list_empty(&to_destroy)) ^ mm/slab_common.c:437:16: note: Assuming condition is false if (list_empty(&to_destroy)) ^ mm/slab_common.c:437:16: note: Assuming condition is false if (list_empty(&to_destroy)) ^ mm/slab_common.c:437:16: note: Assuming condition is false if (list_empty(&to_destroy)) ^ mm/slab_common.c:437:16: note: Assuming condition is false if (list_empty(&to_destroy)) ^ mm/slab_common.c:437:16: note: Assuming condition is false if (list_empty(&to_destroy)) ^ mm/slab_common.c:437:16: note: Assuming condition is false if (list_empty(&to_destroy)) ^ mm/slab_common.c:437:16: note: Assuming condition is false if (list_empty(&to_destroy)) ^ mm/slab_common.c:443:24: note: Uninitialized variables: s.object_size, s.size, s.align, s.flags, s.useroffset, s.usersize, s.name, s.refcount, s.ctor, s.list debugfs_slab_release(s); ^ vim +443 mm/slab_common.c 3965fc36522446 Vladimir Davydov 2014-01-23 418 657dc2f9722092 Tejun Heo 2017-02-22 419 static void slab_caches_to_rcu_destroy_workfn(struct work_struct *work) d5b3cf7139b877 Vladimir Davydov 2015-02-10 420 { 657dc2f9722092 Tejun Heo 2017-02-22 421 LIST_HEAD(to_destroy); 657dc2f9722092 Tejun Heo 2017-02-22 422 struct kmem_cache *s, *s2; d5b3cf7139b877 Vladimir Davydov 2015-02-10 423 657dc2f9722092 Tejun Heo 2017-02-22 424 /* 5f0d5a3ae7cff0 Paul E. McKenney 2017-01-18 425 * On destruction, SLAB_TYPESAFE_BY_RCU kmem_caches are put on the 657dc2f9722092 Tejun Heo 2017-02-22 426 * @slab_caches_to_rcu_destroy list. The slab pages are freed 081a06fa299066 Randy Dunlap 2020-08-11 427 * through RCU and the associated kmem_cache are dereferenced 657dc2f9722092 Tejun Heo 2017-02-22 428 * while freeing the pages, so the kmem_caches should be freed only 657dc2f9722092 Tejun Heo 2017-02-22 429 * after the pending RCU operations are finished. As rcu_barrier() 657dc2f9722092 Tejun Heo 2017-02-22 430 * is a pretty slow operation, we batch all pending destructions 657dc2f9722092 Tejun Heo 2017-02-22 431 * asynchronously. 657dc2f9722092 Tejun Heo 2017-02-22 432 */ 657dc2f9722092 Tejun Heo 2017-02-22 433 mutex_lock(&slab_mutex); 657dc2f9722092 Tejun Heo 2017-02-22 434 list_splice_init(&slab_caches_to_rcu_destroy, &to_destroy); 657dc2f9722092 Tejun Heo 2017-02-22 435 mutex_unlock(&slab_mutex); d5b3cf7139b877 Vladimir Davydov 2015-02-10 436 657dc2f9722092 Tejun Heo 2017-02-22 437 if (list_empty(&to_destroy)) 657dc2f9722092 Tejun Heo 2017-02-22 438 return; 657dc2f9722092 Tejun Heo 2017-02-22 439 657dc2f9722092 Tejun Heo 2017-02-22 440 rcu_barrier(); 657dc2f9722092 Tejun Heo 2017-02-22 441 657dc2f9722092 Tejun Heo 2017-02-22 442 list_for_each_entry_safe(s, s2, &to_destroy, list) { 64dd68497be76a Faiyaz Mohammed 2021-06-28 @443 debugfs_slab_release(s); d3fb45f370d927 Alexander Potapenko 2021-02-25 444 kfence_shutdown_cache(s); 657dc2f9722092 Tejun Heo 2017-02-22 445 #ifdef SLAB_SUPPORTS_SYSFS 657dc2f9722092 Tejun Heo 2017-02-22 446 sysfs_slab_release(s); 657dc2f9722092 Tejun Heo 2017-02-22 447 #else 657dc2f9722092 Tejun Heo 2017-02-22 448 slab_kmem_cache_release(s); 657dc2f9722092 Tejun Heo 2017-02-22 449 #endif 657dc2f9722092 Tejun Heo 2017-02-22 450 } d5b3cf7139b877 Vladimir Davydov 2015-02-10 451 } d5b3cf7139b877 Vladimir Davydov 2015-02-10 452 :::::: The code at line 443 was first introduced by commit :::::: 64dd68497be76ab4e237cca06f5324e220d0f050 mm: slub: move sysfs slab alloc/free interfaces to debugfs :::::: TO: Faiyaz Mohammed <faiyazm(a)codeaurora.org&gt; :::::: CC: Linus Torvalds <torvalds(a)linux-foundation.org&gt; -- 0-DAY CI Kernel Test Service https://01.org/lkp