:::::: :::::: Manual check reason: "low confidence bisect report" :::::: Manual check reason: "low confidence static check warning: kernel/trace/trace_events.c:2684:22: warning: use of uninitialized value '<unknown>' [CWE-457] [-Wanalyzer-use-of-uninitialized-value]" ::::::
BCC: [email protected] CC: [email protected] CC: [email protected] TO: "Steven Rostedt (VMware)" <[email protected]> tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 7e18e42e4b280c85b76967a9106a13ca61c16179 commit: 6cb206508b621a9a0a2c35b60540e399225c8243 tracing: Check pid filtering when creating events date: 9 months ago :::::: branch date: 7 hours ago :::::: commit date: 9 months ago config: arm-randconfig-c002-20220831 (https://download.01.org/0day-ci/archive/20220905/[email protected]/config) compiler: arm-linux-gnueabi-gcc (GCC) 12.1.0 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 # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=6cb206508b621a9a0a2c35b60540e399225c8243 git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git git fetch --no-tags linus master git checkout 6cb206508b621a9a0a2c35b60540e399225c8243 # save the config file COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross ARCH=arm KBUILD_USERCFLAGS='-fanalyzer -Wno-error' If you fix the issue, kindly add following tag where applicable Reported-by: kernel test robot <[email protected]> gcc_analyzer warnings: (new ones prefixed by >>) kernel/trace/trace_events.c: In function 'trace_create_new_event': kernel/trace/trace_events.c:2681:32: warning: variable 'no_pid_list' set but not used [-Wunused-but-set-variable] 2681 | struct trace_pid_list *no_pid_list; | ^~~~~~~~~~~ >> kernel/trace/trace_events.c:2684:22: warning: use of uninitialized value >> '<unknown>' [CWE-457] [-Wanalyzer-use-of-uninitialized-value] 2684 | unsigned int first; | ^~~~~ '__add_event_to_tracers': event 1 | | 3419 | static void __add_event_to_tracers(struct trace_event_call *call) | | ^~~~~~~~~~~~~~~~~~~~~~ | | | | | (1) entry to '__add_event_to_tracers' | '__add_event_to_tracers': event 2 | |include/linux/list.h:631:14: | 631 | !list_entry_is_head(pos, head, member); \ | | ^ | | | | | (2) following 'true' branch... kernel/trace/trace_events.c:3423:9: note: in expansion of macro 'list_for_each_entry' | 3423 | list_for_each_entry(tr, &ftrace_trace_arrays, list) | | ^~~~~~~~~~~~~~~~~~~ | '__add_event_to_tracers': events 3-4 | | 3424 | __trace_add_new_event(call, tr); | | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | | | | | (3) ...to here | | (4) calling '__trace_add_new_event' from '__add_event_to_tracers' | +--> '__trace_add_new_event': events 5-6 | | 2711 | __trace_add_new_event(struct trace_event_call *call, struct trace_array *tr) | | ^~~~~~~~~~~~~~~~~~~~~ | | | | | (5) entry to '__trace_add_new_event' |...... | 2715 | file = trace_create_new_event(call, tr); | | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | | | | | (6) calling 'trace_create_new_event' from '__trace_add_new_event' | +--> 'trace_create_new_event': events 7-8 | | 2678 | trace_create_new_event(struct trace_event_call *call, | | ^~~~~~~~~~~~~~~~~~~~~~ | | | | | (7) entry to 'trace_create_new_event' |...... | 2684 | unsigned int first; | | ~~~~~ | | | | | (8) use of uninitialized value '<unknown>' here | vim +2684 kernel/trace/trace_events.c 0c564a538aa934 Steven Rostedt (Red Hat 2015-03-24 2676) 7f1d2f8210195c Steven Rostedt (Red Hat 2015-05-05 2677) static struct trace_event_file * 2425bcb9240f8c Steven Rostedt (Red Hat 2015-05-05 2678) trace_create_new_event(struct trace_event_call *call, da511bf33e47ea Steven Rostedt (Red Hat 2013-05-09 2679) struct trace_array *tr) da511bf33e47ea Steven Rostedt (Red Hat 2013-05-09 2680) { 6cb206508b621a Steven Rostedt (VMware 2021-11-26 @2681) struct trace_pid_list *no_pid_list; 6cb206508b621a Steven Rostedt (VMware 2021-11-26 2682) struct trace_pid_list *pid_list; 7f1d2f8210195c Steven Rostedt (Red Hat 2015-05-05 2683) struct trace_event_file *file; 6cb206508b621a Steven Rostedt (VMware 2021-11-26 @2684) unsigned int first; da511bf33e47ea Steven Rostedt (Red Hat 2013-05-09 2685) da511bf33e47ea Steven Rostedt (Red Hat 2013-05-09 2686) file = kmem_cache_alloc(file_cachep, GFP_TRACE); da511bf33e47ea Steven Rostedt (Red Hat 2013-05-09 2687) if (!file) da511bf33e47ea Steven Rostedt (Red Hat 2013-05-09 2688) return NULL; da511bf33e47ea Steven Rostedt (Red Hat 2013-05-09 2689) 6cb206508b621a Steven Rostedt (VMware 2021-11-26 2690) pid_list = rcu_dereference_protected(tr->filtered_pids, 6cb206508b621a Steven Rostedt (VMware 2021-11-26 2691) lockdep_is_held(&event_mutex)); 6cb206508b621a Steven Rostedt (VMware 2021-11-26 2692) no_pid_list = rcu_dereference_protected(tr->filtered_no_pids, 6cb206508b621a Steven Rostedt (VMware 2021-11-26 2693) lockdep_is_held(&event_mutex)); 6cb206508b621a Steven Rostedt (VMware 2021-11-26 2694) 6cb206508b621a Steven Rostedt (VMware 2021-11-26 2695) if (!trace_pid_list_first(pid_list, &first) || 6cb206508b621a Steven Rostedt (VMware 2021-11-26 2696) !trace_pid_list_first(pid_list, &first)) 6cb206508b621a Steven Rostedt (VMware 2021-11-26 2697) file->flags |= EVENT_FILE_FL_PID_FILTER; 6cb206508b621a Steven Rostedt (VMware 2021-11-26 2698) da511bf33e47ea Steven Rostedt (Red Hat 2013-05-09 2699) file->event_call = call; da511bf33e47ea Steven Rostedt (Red Hat 2013-05-09 2700) file->tr = tr; da511bf33e47ea Steven Rostedt (Red Hat 2013-05-09 2701) atomic_set(&file->sm_ref, 0); 85f2b08268c014 Tom Zanussi 2013-10-24 2702 atomic_set(&file->tm_ref, 0); 85f2b08268c014 Tom Zanussi 2013-10-24 2703 INIT_LIST_HEAD(&file->triggers); da511bf33e47ea Steven Rostedt (Red Hat 2013-05-09 2704) list_add(&file->list, &tr->events); da511bf33e47ea Steven Rostedt (Red Hat 2013-05-09 2705) da511bf33e47ea Steven Rostedt (Red Hat 2013-05-09 2706) return file; da511bf33e47ea Steven Rostedt (Red Hat 2013-05-09 2707) } da511bf33e47ea Steven Rostedt (Red Hat 2013-05-09 2708) -- 0-DAY CI Kernel Test Service https://01.org/lkp _______________________________________________ kbuild mailing list -- [email protected] To unsubscribe send an email to [email protected]
