>From 4262819d046dacfb75ad2d639cb61c5b6985e159 Mon Sep 17 00:00:00 2001
From: Jerome Glisse <jglisse@redhat.com>
Date: Fri, 2 Dec 2011 17:50:02 -0500
Subject: [PATCH] UGLY DEBUGING

WARNING: at mm/slub.c:3357, kernel BUG at mm/slub.c:3413
---
 drivers/gpu/drm/drm_crtc.c     |    2 ++
 drivers/gpu/drm/drm_pci.c      |    2 ++
 drivers/gpu/drm/drm_platform.c |    2 ++
 lib/idr.c                      |    6 +++++-
 mm/slab.c                      |    2 +-
 5 files changed, 12 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c
index 8323fc3..a1a0a69 100644
--- a/drivers/gpu/drm/drm_crtc.c
+++ b/drivers/gpu/drm/drm_crtc.c
@@ -242,6 +242,7 @@ again:
 
 	obj->id = new_id;
 	obj->type = obj_type;
+DRM_INFO("allocating idr %p %d idr %d\n", obj, obj_type, new_id);
 	return 0;
 }
 
@@ -259,6 +260,7 @@ static void drm_mode_object_put(struct drm_device *dev,
 				struct drm_mode_object *object)
 {
 	mutex_lock(&dev->mode_config.idr_mutex);
+DRM_INFO("remove idr %p %d idr %d\n", object, object->type, object->id);
 	idr_remove(&dev->mode_config.crtc_idr, object->id);
 	mutex_unlock(&dev->mode_config.idr_mutex);
 }
diff --git a/drivers/gpu/drm/drm_pci.c b/drivers/gpu/drm/drm_pci.c
index d4d10b7..7932ebb 100644
--- a/drivers/gpu/drm/drm_pci.c
+++ b/drivers/gpu/drm/drm_pci.c
@@ -345,11 +345,13 @@ int drm_get_pci_dev(struct pci_dev *pdev, const struct pci_device_id *ent,
 
 	if (drm_core_check_feature(dev, DRIVER_MODESET)) {
 		pci_set_drvdata(pdev, dev);
+printk(KERN_INFO "%s %d\n", __func__, __LINE__);
 		ret = drm_get_minor(dev, &dev->control, DRM_MINOR_CONTROL);
 		if (ret)
 			goto err_g2;
 	}
 
+printk(KERN_INFO "%s %d\n", __func__, __LINE__);
 	if ((ret = drm_get_minor(dev, &dev->primary, DRM_MINOR_LEGACY)))
 		goto err_g3;
 
diff --git a/drivers/gpu/drm/drm_platform.c b/drivers/gpu/drm/drm_platform.c
index ae9db5e..3e7e401 100644
--- a/drivers/gpu/drm/drm_platform.c
+++ b/drivers/gpu/drm/drm_platform.c
@@ -65,11 +65,13 @@ int drm_get_platform_dev(struct platform_device *platdev,
 
 	if (drm_core_check_feature(dev, DRIVER_MODESET)) {
 		dev_set_drvdata(&platdev->dev, dev);
+printk(KERN_INFO "%s %d\n", __func__, __LINE__);
 		ret = drm_get_minor(dev, &dev->control, DRM_MINOR_CONTROL);
 		if (ret)
 			goto err_g1;
 	}
 
+printk(KERN_INFO "%s %d\n", __func__, __LINE__);
 	ret = drm_get_minor(dev, &dev->primary, DRM_MINOR_LEGACY);
 	if (ret)
 		goto err_g2;
diff --git a/lib/idr.c b/lib/idr.c
index ed055b2..22c3ec6 100644
--- a/lib/idr.c
+++ b/lib/idr.c
@@ -427,6 +427,7 @@ void idr_remove(struct idr *idp, int id)
 		 * layers that fall into the freelist are those that have been
 		 * preallocated.
 		 */
+printk(KERN_INFO "%s free idr %p\n", __func__, p);
 		kmem_cache_free(idr_layer_cache, p);
 	}
 	return;
@@ -489,6 +490,7 @@ void idr_destroy(struct idr *idp)
 {
 	while (idp->id_free_cnt) {
 		struct idr_layer *p = get_from_free_list(idp);
+printk(KERN_INFO "%s free idr %p\n", __func__, p);
 		kmem_cache_free(idr_layer_cache, p);
 	}
 }
@@ -841,8 +843,10 @@ int ida_get_new_above(struct ida *ida, int starting_id, int *p_id)
 	 */
 	if (ida->idr.id_free_cnt || ida->free_bitmap) {
 		struct idr_layer *p = get_from_free_list(&ida->idr);
-		if (p)
+		if (p) {
+printk(KERN_INFO "%s free idr %p\n", __func__, p);
 			kmem_cache_free(idr_layer_cache, p);
+		}
 	}
 
 	return 0;
diff --git a/mm/slab.c b/mm/slab.c
index 708efe8..83864f9 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -1926,7 +1926,7 @@ static void check_poison_obj(struct kmem_cache *cachep, void *objp)
 			/* Mismatch ! */
 			/* Print header */
 			if (lines == 0) {
-				printk(KERN_ERR
+				WARN(1, 
 					"Slab corruption: %s start=%p, len=%d\n",
 					cachep->name, realobj, size);
 				print_objinfo(cachep, objp, 0);
-- 
1.7.7.1