diff --git a/drivers/md/md.c b/drivers/md/md.c index ac85ec73a409..2362397b0808 100644 --- a/drivers/md/md.c +++ b/drivers/md/md.c @@ -646,6 +646,15 @@ static void __mddev_put(struct mddev *mddev) * Call queue_work inside the spinlock so that flush_workqueue() after * mddev_find will succeed in waiting for the work to be done. */ + { + const int ref = refcount_read(&mddev->kobj.kref.refcount); + + pr_warn("%s %s (%px) %d\n", __func__, mddev->kobj.name, &mddev->kobj, ref); + if (!ref) + BUG(); + else + dump_stack(); + } queue_work(md_misc_wq, &mddev->del_work); } diff --git a/lib/kobject.c b/lib/kobject.c index abe5f5b856ce..028909882389 100644 --- a/lib/kobject.c +++ b/lib/kobject.c @@ -641,6 +641,13 @@ struct kobject *kobject_get(struct kobject *kobj) "kobject: '%s' (%p): is not initialized, yet kobject_get() is being called.\n", kobject_name(kobj), kobj); kref_get(&kobj->kref); + if (kobj->name && kobj->name[0] == 'm' && kobj->name[1] == 'd' && + kobj->name[2] >= '0' && kobj->name[2] <= '9') { + const int ref = refcount_read(&kobj->kref.refcount); + + pr_warn("%s %s (%px) %d->%d\n", __func__, kobj->name, kobj, ref - 1, ref); + dump_stack(); + } } return kobj; } @@ -652,6 +659,13 @@ struct kobject * __must_check kobject_get_unless_zero(struct kobject *kobj) return NULL; if (!kref_get_unless_zero(&kobj->kref)) kobj = NULL; + if (kobj && kobj->name && kobj->name[0] == 'm' && kobj->name[1] == 'd' && + kobj->name[2] >= '0' && kobj->name[2] <= '9') { + const int ref = refcount_read(&kobj->kref.refcount); + + pr_warn("%s %s (%px) %d->%d\n", __func__, kobj->name, kobj, ref - 1, ref); + dump_stack(); + } return kobj; } EXPORT_SYMBOL(kobject_get_unless_zero); @@ -734,6 +748,13 @@ void kobject_put(struct kobject *kobj) WARN(1, KERN_WARNING "kobject: '%s' (%p): is not initialized, yet kobject_put() is being called.\n", kobject_name(kobj), kobj); + if (kobj->name && kobj->name[0] == 'm' && kobj->name[1] == 'd' && + kobj->name[2] >= '0' && kobj->name[2] <= '9') { + const int ref = refcount_read(&kobj->kref.refcount); + + pr_warn("%s %s (%px) %d->%d\n", __func__, kobj->name, kobj, ref, ref - 1); + dump_stack(); + } kref_put(&kobj->kref, kobject_release); } }