diff --git a/kmod/src/btree.c b/kmod/src/btree.c
index 15e28c8c..d8ff6d51 100644
--- a/kmod/src/btree.c
+++ b/kmod/src/btree.c
@@ -27,6 +27,7 @@
 #include "counters.h"
 #include "triggers.h"
 #include "options.h"
+#include "msg.h"
 
 #include "scoutfs_trace.h"
 
@@ -1145,6 +1146,15 @@ restart:
 
 		/* XXX more aggressive block verification, before ref updates? */
 		if (bt->level != level) {
+			scoutfs_corruption(sb, SC_BTREE_BLOCK_LEVEL,
+					   corrupt_btree_block_level,
+					   "root_height %u root_blkno %llu root_seq %llu blkno %llu seq %llu level %u expected %u",
+					   root->height,
+					   le64_to_cpu(root->ref.blkno),
+					   le64_to_cpu(root->ref.seq),
+					   le64_to_cpu(bt->blkno),
+					   le64_to_cpu(bt->seq), bt->level,
+					   level);
 			ret = -EIO;
 			break;
 		}
@@ -1177,6 +1187,15 @@ restart:
 		/* Find the next child block for the search key. */
 		pos = find_pos(bt, key, key_len, &cmp);
 		if (pos >= nr) {
+			scoutfs_corruption(sb, SC_BTREE_NO_CHILD_REF,
+					   corrupt_btree_block_level,
+					   "root_height %u root_blkno %llu root_seq %llu blkno %llu seq %llu level %u nr %u pos %u cmp %d",
+					   root->height,
+					   le64_to_cpu(root->ref.blkno),
+					   le64_to_cpu(root->ref.seq),
+					   le64_to_cpu(bt->blkno),
+					   le64_to_cpu(bt->seq), bt->level,
+					   nr, pos, cmp);
 			ret = -EIO;
 			break;
 		}
diff --git a/kmod/src/counters.h b/kmod/src/counters.h
index a919b191..6ecbd8e5 100644
--- a/kmod/src/counters.h
+++ b/kmod/src/counters.h
@@ -23,6 +23,8 @@
 	EXPAND_COUNTER(compact_stale_error)			\
 	EXPAND_COUNTER(compact_sticky_upper)			\
 	EXPAND_COUNTER(compact_sticky_written)			\
+	EXPAND_COUNTER(corrupt_btree_block_level)		\
+	EXPAND_COUNTER(corrupt_btree_no_child_ref)		\
 	EXPAND_COUNTER(corrupt_dirent_backref_name_len)		\
 	EXPAND_COUNTER(corrupt_dirent_name_len)			\
 	EXPAND_COUNTER(corrupt_dirent_readdir_name_len)		\
diff --git a/kmod/src/format.h b/kmod/src/format.h
index 54857d24..4b60a75c 100644
--- a/kmod/src/format.h
+++ b/kmod/src/format.h
@@ -655,6 +655,8 @@ enum {
 	SC_SYMLINK_INODE_SIZE,
 	SC_SYMLINK_MISSING_ITEM,
 	SC_SYMLINK_NOT_NULL_TERM,
+	SC_BTREE_BLOCK_LEVEL,
+	SC_BTREE_NO_CHILD_REF,
 	SC_NR_SOURCES,
 };