tree: https://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git sched/wip2 head: fb0089110c5e29151c75028add05458ad2bf8a68 commit: fb0089110c5e29151c75028add05458ad2bf8a68 [5/5] sched: Massage set_cpus_allowed config: x86_64-randconfig-r026-20200916 (attached as .config) compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project 9e3842d60351f986d77dfe0a94f76e4fd895f188) reproduce (this is a W=1 build): wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # install x86_64 cross compiling tool for clang build # apt-get install binutils-x86-64-linux-gnu git checkout fb0089110c5e29151c75028add05458ad2bf8a68 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): retval = __set_cpus_allowed_ptr(p, new_mask, SCA_CHECK); ^ 1 error generated. # https://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git/commit/?... git remote add peterz-queue https://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git git fetch --no-tags peterz-queue sched/wip2 git checkout fb0089110c5e29151c75028add05458ad2bf8a68 vim +/SCA_CHECK +6058 kernel/sched/core.c 5991 5992 long sched_setaffinity(pid_t pid, const struct cpumask *in_mask) 5993 { 5994 cpumask_var_t cpus_allowed, new_mask; 5995 struct task_struct *p; 5996 int retval; 5997 5998 rcu_read_lock(); 5999 6000 p = find_process_by_pid(pid); 6001 if (!p) { 6002 rcu_read_unlock(); 6003 return -ESRCH; 6004 } 6005 6006 /* Prevent p going away */ 6007 get_task_struct(p); 6008 rcu_read_unlock(); 6009 6010 if (p->flags & PF_NO_SETAFFINITY) { 6011 retval = -EINVAL; 6012 goto out_put_task; 6013 } 6014 if (!alloc_cpumask_var(&cpus_allowed, GFP_KERNEL)) { 6015 retval = -ENOMEM; 6016 goto out_put_task; 6017 } 6018 if (!alloc_cpumask_var(&new_mask, GFP_KERNEL)) { 6019 retval = -ENOMEM; 6020 goto out_free_cpus_allowed; 6021 } 6022 retval = -EPERM; 6023 if (!check_same_owner(p)) { 6024 rcu_read_lock(); 6025 if (!ns_capable(__task_cred(p)->user_ns, CAP_SYS_NICE)) { 6026 rcu_read_unlock(); 6027 goto out_free_new_mask; 6028 } 6029 rcu_read_unlock(); 6030 } 6031 6032 retval = security_task_setscheduler(p); 6033 if (retval) 6034 goto out_free_new_mask; 6035 6036 6037 cpuset_cpus_allowed(p, cpus_allowed); 6038 cpumask_and(new_mask, in_mask, cpus_allowed); 6039 6040 /* 6041 * Since bandwidth control happens on root_domain basis, 6042 * if admission test is enabled, we only admit -deadline 6043 * tasks allowed to run on all the CPUs in the task's 6044 * root_domain. 6045 */ 6046 #ifdef CONFIG_SMP 6047 if (task_has_dl_policy(p) && dl_bandwidth_enabled()) { 6048 rcu_read_lock(); 6049 if (!cpumask_subset(task_rq(p)->rd->span, new_mask)) { 6050 retval = -EBUSY; 6051 rcu_read_unlock(); 6052 goto out_free_new_mask; 6053 } 6054 rcu_read_unlock(); 6055 } 6056 #endif 6057 again: 6059 6060 if (!retval) { 6061 cpuset_cpus_allowed(p, cpus_allowed); 6062 if (!cpumask_subset(new_mask, cpus_allowed)) { 6063 /* 6064 * We must have raced with a concurrent cpuset 6065 * update. Just reset the cpus_allowed to the 6066 * cpuset's cpus_allowed 6067 */ 6068 cpumask_copy(new_mask, cpus_allowed); 6069 goto again; 6070 } 6071 } 6072 out_free_new_mask: 6073 free_cpumask_var(new_mask); 6074 out_free_cpus_allowed: 6075 free_cpumask_var(cpus_allowed); 6076 out_put_task: 6077 put_task_struct(p); 6078 return retval; 6079 } 6080 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org