tree: https://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git sched/core head: f530b3f85f437a7beb09ac49cef3ce771c40715f commit: d7533f6616e62e1aceaa580bcffa32eb2d36f2ab [3/5] sched/fair: Eliminate bandwidth race between throttling and distribution config: i386-allyesconfig (attached as .config) compiler: gcc-7 (Ubuntu 7.5.0-6ubuntu2) 7.5.0 reproduce: git checkout d7533f6616e62e1aceaa580bcffa32eb2d36f2ab # save the attached .config to linux build tree make ARCH=i386 If you fix the issue, kindly add following tag as appropriate Reported-by: kbuild test robot <lkp(a)intel.com&gt; All error/warnings (new ones prefixed by >>): In file included from arch/x86/include/asm/bug.h:83:0, from include/linux/bug.h:5, from include/linux/thread_info.h:12, from arch/x86/include/asm/preempt.h:7, from include/linux/preempt.h:78, from include/linux/rcupdate.h:27, from include/linux/rculist.h:11, from include/linux/pid.h:5, from include/linux/sched.h:14, from kernel/sched/sched.h:5, from kernel/sched/fair.c:23: kernel/sched/fair.c: In function '__assign_cfs_rq_runtime': lockdep_assert_held(cfs_rq->lock); ^ include/asm-generic/bug.h:113:25: note: in definition of macro 'WARN_ON' int __ret_warn_on = !!(condition); \ ^~~~~~~~~ include/linux/lockdep.h:435:27: note: in expansion of macro 'lockdep_is_held' WARN_ON(debug_locks && !lockdep_is_held(l)); \ ^~~~~~~~~~~~~~~ lockdep_assert_held(cfs_rq->lock); ^~~~~~~~~~~~~~~~~~~ vim +4596 kernel/sched/fair.c 4589 4590 /* returns 0 on failure to allocate runtime */ 4591 static int __assign_cfs_rq_runtime(struct cfs_bandwidth *cfs_b, 4592 struct cfs_rq *cfs_rq, u64 target_runtime) 4593 { 4594 u64 min_amount, amount = 0; 4595 4597 4598 /* note: this is a positive sum as runtime_remaining <= 0 */ 4599 min_amount = target_runtime - cfs_rq->runtime_remaining; 4600 4601 if (cfs_b->quota == RUNTIME_INF) 4602 amount = min_amount; 4603 else { 4604 start_cfs_bandwidth(cfs_b); 4605 4606 if (cfs_b->runtime > 0) { 4607 amount = min(cfs_b->runtime, min_amount); 4608 cfs_b->runtime -= amount; 4609 cfs_b->idle = 0; 4610 } 4611 } 4612 4613 cfs_rq->runtime_remaining += amount; 4614 4615 return cfs_rq->runtime_remaining > 0; 4616 } 4617 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org