diff --git a/fs/ext4/ext4_jbd2.c b/fs/ext4/ext4_jbd2.c
index f5240aa..aca1790 100644
--- a/fs/ext4/ext4_jbd2.c
+++ b/fs/ext4/ext4_jbd2.c
@@ -109,9 +109,11 @@
 
 	if (ext4_handle_valid(handle)) {
 		err = jbd2_journal_dirty_metadata(handle, bh);
-		if (err)
-			ext4_journal_abort_handle(where, line, __func__,
-						  bh, handle, err);
+		if (err) {
+			/* Errors can only happen if there is a bug */
+			handle->h_err = err;
+			__ext4_journal_stop(where, line, handle);
+		}
 	} else {
 		if (inode)
 			mark_buffer_dirty_inode(bh, inode);
diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
index 9124cd2..2c5216a 100644
--- a/fs/ext4/extents.c
+++ b/fs/ext4/extents.c
@@ -96,13 +96,17 @@
  *  - ENOMEM
  *  - EIO
  */
-static int ext4_ext_dirty(handle_t *handle, struct inode *inode,
-				struct ext4_ext_path *path)
+#define ext4_ext_dirty(handle, inode, path) \
+		__ext4_ext_dirty(__func__, __LINE__, (handle), (inode), (path))
+static int __ext4_ext_dirty(const char *where, unsigned int line,
+			    handle_t *handle, struct inode *inode,
+			    struct ext4_ext_path *path)
 {
 	int err;
 	if (path->p_bh) {
 		/* path points to block */
-		err = ext4_handle_dirty_metadata(handle, inode, path->p_bh);
+		err = __ext4_handle_dirty_metadata(where, line, handle,
+						   inode, path->p_bh);
 	} else {
 		/* path points to leaf/index in inode body */
 		err = ext4_mark_inode_dirty(handle, inode);
diff --git a/fs/jbd2/transaction.c b/fs/jbd2/transaction.c
index 2d71094..cb56fe9 100644
--- a/fs/jbd2/transaction.c
+++ b/fs/jbd2/transaction.c
@@ -1049,6 +1049,10 @@
  * mark dirty metadata which needs to be journaled as part of the current
  * transaction.
  *
+ * The buffer must have previously had jbd2_journal_get_write_access()
+ * called so that it has a valid journal_head attached to the buffer
+ * head.
+ *
  * The buffer is placed on the transaction's metadata list and is marked
  * as belonging to the transaction.
  *
@@ -1065,11 +1069,16 @@
 	transaction_t *transaction = handle->h_transaction;
 	journal_t *journal = transaction->t_journal;
 	struct journal_head *jh = bh2jh(bh);
+	int ret = 0;
 
 	jbd_debug(5, "journal_head %p\n", jh);
 	JBUFFER_TRACE(jh, "entry");
 	if (is_handle_aborted(handle))
 		goto out;
+	if (!buffer_jbd(bh)) {
+		ret = -EUCLEAN;
+		goto out;
+	}
 
 	jbd_lock_bh_state(bh);
 
@@ -1093,8 +1102,20 @@
 	 */
 	if (jh->b_transaction == transaction && jh->b_jlist == BJ_Metadata) {
 		JBUFFER_TRACE(jh, "fastpath");
-		J_ASSERT_JH(jh, jh->b_transaction ==
-					journal->j_running_transaction);
+		if (unlikely(jh->b_transaction !=
+			     journal->j_running_transaction)) {
+			printk(KERN_EMERG "JBD: %s: "
+			       "jh->b_transaction (%llu, %p, %u) != "
+			       "journal->j_running_transaction (%p, %u)",
+			       journal->j_devname,
+			       (unsigned long long) bh->b_blocknr,
+			       jh->b_transaction,
+			       jh->b_transaction ? jh->b_transaction->t_tid : 0,
+			       journal->j_running_transaction,
+			       journal->j_running_transaction ?
+			       journal->j_running_transaction->t_tid : 0);
+			ret = -EINVAL;
+		}
 		goto out_unlock_bh;
 	}
 
@@ -1108,9 +1129,32 @@
 	 */
 	if (jh->b_transaction != transaction) {
 		JBUFFER_TRACE(jh, "already on other transaction");
-		J_ASSERT_JH(jh, jh->b_transaction ==
-					journal->j_committing_transaction);
-		J_ASSERT_JH(jh, jh->b_next_transaction == transaction);
+		if (unlikely(jh->b_transaction !=
+			     journal->j_committing_transaction)) {
+			printk(KERN_EMERG "JBD: %s: "
+			       "jh->b_transaction (%llu, %p, %u) != "
+			       "journal->j_committing_transaction (%p, %u)",
+			       journal->j_devname,
+			       (unsigned long long) bh->b_blocknr,
+			       jh->b_transaction,
+			       jh->b_transaction ? jh->b_transaction->t_tid : 0,
+			       journal->j_committing_transaction,
+			       journal->j_committing_transaction ?
+			       journal->j_committing_transaction->t_tid : 0);
+			ret = -EINVAL;
+		}
+		if (unlikely(jh->b_next_transaction != transaction)) {
+			printk(KERN_EMERG "JBD: %s: "
+			       "jh->b_next_transaction (%llu, %p, %u) != "
+			       "transaction (%p, %u)",
+			       journal->j_devname,
+			       (unsigned long long) bh->b_blocknr,
+			       jh->b_next_transaction,
+			       jh->b_next_transaction ?
+			       jh->b_next_transaction->t_tid : 0,
+			       transaction, transaction->t_tid);
+			ret = -EINVAL;
+		}
 		/* And this case is illegal: we can't reuse another
 		 * transaction's data buffer, ever. */
 		goto out_unlock_bh;
@@ -1127,7 +1171,9 @@
 	jbd_unlock_bh_state(bh);
 out:
 	JBUFFER_TRACE(jh, "exit");
-	return 0;
+	if (ret)
+		__WARN();	/* All errors are bugs, so dump the stack */
+	return ret;
 }
 
 /*