tree: https://github.com/0day-ci/linux/commits/UPDATE-20200915-064914/Nikolay-A... head: 784cbfb5fbccf5af49aa79a65d53338137044d35 commit: 784cbfb5fbccf5af49aa79a65d53338137044d35 [1/1] rcu: prevent RCU_LOCKDEP_WARN() from swallowing the condition config: arm-defconfig (attached as .config) compiler: arm-linux-gnueabi-gcc (GCC) 9.3.0 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 git checkout 784cbfb5fbccf5af49aa79a65d53338137044d35 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=arm 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 >>): In file included from include/linux/rcupdate_wait.h:9, from kernel/rcu/srcutree.c:22: kernel/rcu/srcutree.c: In function '__synchronize_srcu': 922 | RCU_LOCKDEP_WARN(lock_is_held(&ssp->dep_map) || | ^~ include/linux/rcupdate.h:324:52: note: in definition of macro 'RCU_LOCKDEP_WARN' 324 | #define RCU_LOCKDEP_WARN(c, s) do { } while (0 && (c)) | ^ # https://github.com/0day-ci/linux/commit/784cbfb5fbccf5af49aa79a65d5333813... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review UPDATE-20200915-064914/Nikolay-Aleksandrov/net-bridge-mcast-fix-unused-br-var-when-lockdep-isn-t-defined/20200908-151845 git checkout 784cbfb5fbccf5af49aa79a65d53338137044d35 vim +922 kernel/rcu/srcutree.c dad81a2026841b Paul E. McKenney 2017-03-25 914 dad81a2026841b Paul E. McKenney 2017-03-25 915 /* dad81a2026841b Paul E. McKenney 2017-03-25 916 * Helper function for synchronize_srcu() and synchronize_srcu_expedited(). dad81a2026841b Paul E. McKenney 2017-03-25 917 */ aacb5d91ab1bfb Paul E. McKenney 2018-10-28 918 static void __synchronize_srcu(struct srcu_struct *ssp, bool do_norm) dad81a2026841b Paul E. McKenney 2017-03-25 919 { dad81a2026841b Paul E. McKenney 2017-03-25 920 struct rcu_synchronize rcu; dad81a2026841b Paul E. McKenney 2017-03-25 921 aacb5d91ab1bfb Paul E. McKenney 2018-10-28 @922 RCU_LOCKDEP_WARN(lock_is_held(&ssp->dep_map) || dad81a2026841b Paul E. McKenney 2017-03-25 923 lock_is_held(&rcu_bh_lock_map) || dad81a2026841b Paul E. McKenney 2017-03-25 924 lock_is_held(&rcu_lock_map) || dad81a2026841b Paul E. McKenney 2017-03-25 925 lock_is_held(&rcu_sched_lock_map), dad81a2026841b Paul E. McKenney 2017-03-25 926 "Illegal synchronize_srcu() in same-type SRCU (or in RCU) read-side critical section"); dad81a2026841b Paul E. McKenney 2017-03-25 927 dad81a2026841b Paul E. McKenney 2017-03-25 928 if (rcu_scheduler_active == RCU_SCHEDULER_INACTIVE) dad81a2026841b Paul E. McKenney 2017-03-25 929 return; dad81a2026841b Paul E. McKenney 2017-03-25 930 might_sleep(); aacb5d91ab1bfb Paul E. McKenney 2018-10-28 931 check_init_srcu_struct(ssp); dad81a2026841b Paul E. McKenney 2017-03-25 932 init_completion(&rcu.completion); da915ad5cf25b5 Paul E. McKenney 2017-04-05 933 init_rcu_head_on_stack(&rcu.head); aacb5d91ab1bfb Paul E. McKenney 2018-10-28 934 __call_srcu(ssp, &rcu.head, wakeme_after_rcu, do_norm); dad81a2026841b Paul E. McKenney 2017-03-25 935 wait_for_completion(&rcu.completion); da915ad5cf25b5 Paul E. McKenney 2017-04-05 936 destroy_rcu_head_on_stack(&rcu.head); 35732cf9dd38b1 Paul E. McKenney 2017-07-05 937 35732cf9dd38b1 Paul E. McKenney 2017-07-05 938 /* 35732cf9dd38b1 Paul E. McKenney 2017-07-05 939 * Make sure that later code is ordered after the SRCU grace d633198088bd9e Paul E. McKenney 2017-10-10 940 * period. This pairs with the spin_lock_irq_rcu_node() 35732cf9dd38b1 Paul E. McKenney 2017-07-05 941 * in srcu_invoke_callbacks(). Unlike Tree RCU, this is needed 35732cf9dd38b1 Paul E. McKenney 2017-07-05 942 * because the current CPU might have been totally uninvolved with 35732cf9dd38b1 Paul E. McKenney 2017-07-05 943 * (and thus unordered against) that grace period. 35732cf9dd38b1 Paul E. McKenney 2017-07-05 944 */ 35732cf9dd38b1 Paul E. McKenney 2017-07-05 945 smp_mb(); dad81a2026841b Paul E. McKenney 2017-03-25 946 } dad81a2026841b Paul E. McKenney 2017-03-25 947 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org