diff --git a/fs/nilfs2/btnode.c b/fs/nilfs2/btnode.c
index 5941958f1e47325e9497cef3101065f3efd73f46..84c25382f8e3b35b13f6509463aef70308bb3164 100644
--- a/fs/nilfs2/btnode.c
+++ b/fs/nilfs2/btnode.c
@@ -87,6 +87,7 @@ int nilfs_btnode_submit_block(struct address_space *btnc, __u64 blocknr,
 			brelse(bh);
 			BUG();
 		}
+		memset(bh->b_data, 0, 1 << inode->i_blkbits);
 		bh->b_bdev = NILFS_I_NILFS(inode)->ns_bdev;
 		bh->b_blocknr = blocknr;
 		set_buffer_mapped(bh);
@@ -276,8 +277,7 @@ void nilfs_btnode_commit_change_key(struct address_space *btnc,
 				       "invalid oldkey %lld (newkey=%lld)",
 				       (unsigned long long)oldkey,
 				       (unsigned long long)newkey);
-		if (!test_set_buffer_dirty(obh) && TestSetPageDirty(opage))
-			BUG();
+		nilfs_btnode_mark_dirty(obh);
 
 		spin_lock_irq(&btnc->tree_lock);
 		radix_tree_delete(&btnc->page_tree, oldkey);
diff --git a/fs/nilfs2/segment.c b/fs/nilfs2/segment.c
index 683df89dbae5a3366ac459e660776bcccc69bc47..6eff66a070d5e39c23a8c2af4f51f6b62ba91881 100644
--- a/fs/nilfs2/segment.c
+++ b/fs/nilfs2/segment.c
@@ -2468,17 +2468,22 @@ static void nilfs_segctor_notify(struct nilfs_sc_info *sci,
 	/* Clear requests (even when the construction failed) */
 	spin_lock(&sci->sc_state_lock);
 
-	sci->sc_state &= ~NILFS_SEGCTOR_COMMIT;
-
 	if (req->mode == SC_LSEG_SR) {
+		sci->sc_state &= ~NILFS_SEGCTOR_COMMIT;
 		sci->sc_seq_done = req->seq_accepted;
 		nilfs_segctor_wakeup(sci, req->sc_err ? : req->sb_err);
 		sci->sc_flush_request = 0;
-	} else if (req->mode == SC_FLUSH_FILE)
-		sci->sc_flush_request &= ~FLUSH_FILE_BIT;
-	else if (req->mode == SC_FLUSH_DAT)
-		sci->sc_flush_request &= ~FLUSH_DAT_BIT;
+	} else {
+		if (req->mode == SC_FLUSH_FILE)
+			sci->sc_flush_request &= ~FLUSH_FILE_BIT;
+		else if (req->mode == SC_FLUSH_DAT)
+			sci->sc_flush_request &= ~FLUSH_DAT_BIT;
 
+		/* re-enable timer if checkpoint creation was not done */
+		if (sci->sc_timer && (sci->sc_state & NILFS_SEGCTOR_COMMIT) &&
+		    time_before(jiffies, sci->sc_timer->expires))
+			add_timer(sci->sc_timer);
+	}
 	spin_unlock(&sci->sc_state_lock);
 }