CC: [email protected] CC: [email protected] TO: "Paul E. McKenney" <[email protected]>
tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 0fcfb00b28c0b7884635dacf38e46d60bf3d4eb1 commit: 0260b92e1c39412b1e345e202355c43169c16274 rcutorture: Forgive RCU boost failures when CPUs don't pass through QS date: 7 months ago :::::: branch date: 22 hours ago :::::: commit date: 7 months ago config: x86_64-randconfig-m001-20211206 (https://download.01.org/0day-ci/archive/20211207/[email protected]/config) compiler: gcc-9 (Debian 9.3.0-22) 9.3.0 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <[email protected]> Reported-by: Dan Carpenter <[email protected]> smatch warnings: kernel/rcu/rcutorture.c:941 rcu_torture_boost_failed() error: uninitialized symbol 'cpu'. vim +/cpu +941 kernel/rcu/rcutorture.c 450efca7182a51 Joel Fernandes (Google 2018-06-10 920) ea6d962e80b619 Paul E. McKenney 2021-03-30 921 static bool rcu_torture_boost_failed(unsigned long gp_state, unsigned long start, unsigned long end) 3b745c8969c752 Joel Fernandes (Google 2018-06-10 922) { 0260b92e1c3941 Paul E. McKenney 2021-04-08 923 int cpu; 5e59fba573e64c Paul E. McKenney 2021-01-15 924 static int dbg_done; bcd4af44e2f173 Paul E. McKenney 2021-04-08 925 bool gp_done; 0260b92e1c3941 Paul E. McKenney 2021-04-08 926 unsigned long j; 0260b92e1c3941 Paul E. McKenney 2021-04-08 927 static unsigned long last_persist; 0260b92e1c3941 Paul E. McKenney 2021-04-08 928 unsigned long lp; 0260b92e1c3941 Paul E. McKenney 2021-04-08 929 unsigned long mininterval = test_boost_duration * HZ - HZ / 2; 5e59fba573e64c Paul E. McKenney 2021-01-15 930 0260b92e1c3941 Paul E. McKenney 2021-04-08 931 if (end - start > mininterval) { 7b9dad7abad707 Paul E. McKenney 2021-04-07 932 // Recheck after checking time to avoid false positives. 7b9dad7abad707 Paul E. McKenney 2021-04-07 933 smp_mb(); // Time check before grace-period check. 7b9dad7abad707 Paul E. McKenney 2021-04-07 934 if (cur_ops->poll_gp_state(gp_state)) 7b9dad7abad707 Paul E. McKenney 2021-04-07 935 return false; // passed, though perhaps just barely 0260b92e1c3941 Paul E. McKenney 2021-04-08 936 if (cur_ops->check_boost_failed && !cur_ops->check_boost_failed(gp_state, &cpu)) { 0260b92e1c3941 Paul E. McKenney 2021-04-08 937 // At most one persisted message per boost test. 0260b92e1c3941 Paul E. McKenney 2021-04-08 938 j = jiffies; 0260b92e1c3941 Paul E. McKenney 2021-04-08 939 lp = READ_ONCE(last_persist); 0260b92e1c3941 Paul E. McKenney 2021-04-08 940 if (time_after(j, lp + mininterval) && cmpxchg(&last_persist, lp, j) == lp) 0260b92e1c3941 Paul E. McKenney 2021-04-08 @941 pr_info("Boost inversion persisted: No QS from CPU %d\n", cpu); 0260b92e1c3941 Paul E. McKenney 2021-04-08 942 return false; // passed on a technicality 0260b92e1c3941 Paul E. McKenney 2021-04-08 943 } 3b745c8969c752 Joel Fernandes (Google 2018-06-10 944) VERBOSE_TOROUT_STRING("rcu_torture_boost boosting failed"); 3b745c8969c752 Joel Fernandes (Google 2018-06-10 945) n_rcu_torture_boost_failure++; ea6d962e80b619 Paul E. McKenney 2021-03-30 946 if (!xchg(&dbg_done, 1) && cur_ops->gp_kthread_dbg) { ea6d962e80b619 Paul E. McKenney 2021-03-30 947 pr_info("Boost inversion thread ->rt_priority %u gp_state %lu jiffies %lu\n", ea6d962e80b619 Paul E. McKenney 2021-03-30 948 current->rt_priority, gp_state, end - start); 5e59fba573e64c Paul E. McKenney 2021-01-15 949 cur_ops->gp_kthread_dbg(); bcd4af44e2f173 Paul E. McKenney 2021-04-08 950 // Recheck after print to flag grace period ending during splat. bcd4af44e2f173 Paul E. McKenney 2021-04-08 951 gp_done = cur_ops->poll_gp_state(gp_state); bcd4af44e2f173 Paul E. McKenney 2021-04-08 952 pr_info("Boost inversion: GP %lu %s.\n", gp_state, bcd4af44e2f173 Paul E. McKenney 2021-04-08 953 gp_done ? "ended already" : "still pending"); bcd4af44e2f173 Paul E. McKenney 2021-04-08 954 ea6d962e80b619 Paul E. McKenney 2021-03-30 955 } 3b745c8969c752 Joel Fernandes (Google 2018-06-10 956) 7b9dad7abad707 Paul E. McKenney 2021-04-07 957 return true; // failed 3b745c8969c752 Joel Fernandes (Google 2018-06-10 958) } 3b745c8969c752 Joel Fernandes (Google 2018-06-10 959) 7b9dad7abad707 Paul E. McKenney 2021-04-07 960 return false; // passed 3b745c8969c752 Joel Fernandes (Google 2018-06-10 961) } 3b745c8969c752 Joel Fernandes (Google 2018-06-10 962) --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/[email protected] _______________________________________________ kbuild mailing list -- [email protected] To unsubscribe send an email to [email protected]
