From: Martin Wilck <[email protected]> Also, introduce booleans that indicate a certain thread has been started successfully. Using these booleans, we can avoid crashing by cancelling threads that have never been started.
Reviewed-by: Benjamin Marzinski <[email protected]> Signed-off-by: Martin Wilck <[email protected]> --- multipathd/main.c | 76 +++++++++++++++++++++++++++++++---------------- 1 file changed, 51 insertions(+), 25 deletions(-) diff --git a/multipathd/main.c b/multipathd/main.c index eb760a7..9eb658d 100644 --- a/multipathd/main.c +++ b/multipathd/main.c @@ -129,6 +129,9 @@ static volatile enum daemon_status running_state = DAEMON_INIT; pid_t daemon_pid; static pthread_mutex_t config_lock = PTHREAD_MUTEX_INITIALIZER; static pthread_cond_t config_cond; +static pthread_t check_thr, uevent_thr, uxlsnr_thr, uevq_thr, dmevent_thr; +static bool check_thr_started, uevent_thr_started, uxlsnr_thr_started, + uevq_thr_started, dmevent_thr_started; static inline enum daemon_status get_running_state(void) { @@ -2927,6 +2930,39 @@ static void cleanup_vecs(void) FREE(gvecs); } +static void cleanup_threads(void) +{ + stop_io_err_stat_thread(); + + if (check_thr_started) + pthread_cancel(check_thr); + if (uevent_thr_started) + pthread_cancel(uevent_thr); + if (uxlsnr_thr_started) + pthread_cancel(uxlsnr_thr); + if (uevq_thr_started) + pthread_cancel(uevq_thr); + if (dmevent_thr_started) + pthread_cancel(dmevent_thr); + + if (check_thr_started) + pthread_join(check_thr, NULL); + if (uevent_thr_started) + pthread_join(uevent_thr, NULL); + if (uxlsnr_thr_started) + pthread_join(uxlsnr_thr, NULL); + if (uevq_thr_started) + pthread_join(uevq_thr, NULL); + if (dmevent_thr_started) + pthread_join(dmevent_thr, NULL); + + /* + * As all threads are joined now, and we're in DAEMON_SHUTDOWN + * state, no new waiter threads will be created any more. + */ + pthread_attr_destroy(&waiter_attr); +} + /* * Use a non-default call_rcu_data for child(). * @@ -2972,7 +3008,6 @@ static void cleanup_rcu(void) static int child (__attribute__((unused)) void *param) { - pthread_t check_thr, uevent_thr, uxlsnr_thr, uevq_thr, dmevent_thr; pthread_attr_t log_attr, misc_attr, uevent_attr; struct vectors * vecs; int rc; @@ -3070,9 +3105,12 @@ child (__attribute__((unused)) void *param) condlog(0, "failed to create cli listener: %d", rc); goto failed; } - else if (state != DAEMON_CONFIGURE) { - condlog(0, "cli listener failed to start"); - goto failed; + else { + uxlsnr_thr_started = true; + if (state != DAEMON_CONFIGURE) { + condlog(0, "cli listener failed to start"); + goto failed; + } } if (poll_dmevents) { @@ -3085,7 +3123,8 @@ child (__attribute__((unused)) void *param) condlog(0, "failed to create dmevent waiter thread: %d", rc); goto failed; - } + } else + dmevent_thr_started = true; } /* @@ -3094,7 +3133,8 @@ child (__attribute__((unused)) void *param) if ((rc = pthread_create(&uevent_thr, &uevent_attr, ueventloop, udev))) { condlog(0, "failed to create uevent thread: %d", rc); goto failed; - } + } else + uevent_thr_started = true; pthread_attr_destroy(&uevent_attr); /* @@ -3103,11 +3143,13 @@ child (__attribute__((unused)) void *param) if ((rc = pthread_create(&check_thr, &misc_attr, checkerloop, vecs))) { condlog(0,"failed to create checker loop thread: %d", rc); goto failed; - } + } else + check_thr_started = true; if ((rc = pthread_create(&uevq_thr, &misc_attr, uevqloop, vecs))) { condlog(0, "failed to create uevent dispatcher: %d", rc); goto failed; - } + } else + uevq_thr_started = true; pthread_attr_destroy(&misc_attr); while (1) { @@ -3136,22 +3178,7 @@ child (__attribute__((unused)) void *param) } } - pthread_cancel(check_thr); - pthread_cancel(uevent_thr); - pthread_cancel(uxlsnr_thr); - pthread_cancel(uevq_thr); - if (poll_dmevents) - pthread_cancel(dmevent_thr); - - pthread_join(check_thr, NULL); - pthread_join(uevent_thr, NULL); - pthread_join(uxlsnr_thr, NULL); - pthread_join(uevq_thr, NULL); - if (poll_dmevents) - pthread_join(dmevent_thr, NULL); - - stop_io_err_stat_thread(); - + cleanup_threads(); cleanup_vecs(); cleanup_foreign(); cleanup_checkers(); @@ -3178,7 +3205,6 @@ child (__attribute__((unused)) void *param) conf = rcu_dereference(multipath_conf); rcu_assign_pointer(multipath_conf, NULL); call_rcu(&conf->rcu, rcu_free_config); - pthread_attr_destroy(&waiter_attr); #ifdef _DEBUG_ dbg_free_final(NULL); #endif -- 2.29.0 -- dm-devel mailing list [email protected] https://www.redhat.com/mailman/listinfo/dm-devel
