this test fails with error 39

#!/bin/bash
set -euo pipefail

MDTEST_BIN="/home/rocky/build/ior/src/mdtest"
dirname="/mnt/lustre/rajeevm/test_dir"

echo "Using dir: $dirname"
echo "Using mdtest: $MDTEST_BIN"
rm -fr $dirname
sudo lctl set_param mdt.*.enable_dir_restripe=1
sudo lctl set_param mdt.*.dir_restripe_nsonly=0

1. Ensure parent directory exists
   sudo chown "$USER:$USER" /mnt/lustre
   if [ ! -d "/mnt/lustre/rajeevm" ]; then
   echo "Creating parent dir /mnt/lustre/rajeevm ..."
   sudo mkdir -p /mnt/lustre/rajeevm
   sudo chown "$USER:$USER" /mnt/lustre/rajeevm
   fi

1. Clean old test dir (optional)
   if [ -e "$dirname" ]; then
   sudo rm -rf "$dirname"
   fi

echo "=== sudo lfs mkdir --mdt-index 1 --mdt-count 2 $dirname ==="

1. Create target dir on MDTs
   sudo lfs mkdir --mdt-index 1 --mdt-count 2 "$dirname"
   sudo chown "$USER:$USER" "$dirname"
   echo "=== $MDTEST_BIN -w 16384 -f 1 -l 1 -i 1 -C -n 500 -t -T -v -v -E -d $dirname -u ==="
2. Run mdtest (single-process, no MPI launcher)
   #"$MDTEST_BIN" -w 16384 -f 1 -l 1 -i 2 -C -n 50000 -t -T -v -v -E -d "$dirname" -u
   "$MDTEST_BIN" -w 16384 -f 1 -l 1 -i 1 -C -n 1 -t -T -v -v -E -d "$dirname" -u
   echo "=== Enabling all Lustre debug ==="
   sudo lctl set_param debug=+all
   sudo lctl set_param debug_mb=256
   sudo lctl clear
   sudo lctl mark "=== START OF RAJEEV DEBUG Migrate ==="

1. Repro step: migrate
   sudo lfs migrate -v --mdt-index 0 --mdt-count 1 "$dirname"
   sudo lctl mark "=== END OF RAJEEV DEBUG Migrate ==="
   sudo lctl dk > /tmp/lustre-migrate-debug.log
   sudo lctl set_param debug=0
   echo "Log saved to /tmp/lustre-migrate-debug.log"
   echo "Done."

tree.0.0
V-1: Rank 0 Line 611 Entering mdtest_read on /mnt/lustre/rajeevm/test_dir/#test-dir.0-0/mdtest_tree.0.0
V-1: Rank 0 Line 1219 File creation : 0.009 sec, 109.879 ops/sec
V-1: Rank 0 Line 1223 File stat : 0.001 sec, 950.243 ops/sec
V-1: Rank 0 Line 1224 File read : 0.004 sec, 264.120 ops/sec
V-1: Rank 0 Line 1225 File removal : 0.000 sec, 0.000 ops/sec
V-1: Rank 0 Line 1237 Entering summarize_results...

SUMMARY rate: (of 1 iterations)
Operation Max Min Mean Std Dev
--------- — — ---- -------
Directory creation : 192.335 192.335 192.335 0.000
Directory stat : 442.647 442.647 442.647 0.000
Directory removal : 0.000 0.000 0.000 0.000
File creation : 109.879 109.879 109.879 0.000
File stat : 950.243 950.243 950.243 0.000
File read : 264.120 264.120 264.120 0.000
File removal : 0.000 0.000 0.000 0.000
Tree creation : 197.015 197.015 197.015 0.000
Tree removal : 0.000 0.000 0.000 0.000
V-1: Entering PrintTimestamp...
– finished at 04/21/2026 15:30:59 –

=== Enabling all Lustre debug ===
debug=+all
debug_mb=256
migrate /mnt/lustre/rajeevm/test_dir to MDT0 stripe count 1
/mnt/lustre/rajeevm/test_dir/#test-dir.0-0 migrated to MDT0 already
/mnt/lustre/rajeevm/test_dir/#test-dir.0-0/mdtest_tree.0.0 migrated to MDT0 already
migrate /mnt/lustre/rajeevm/test_dir/#test-dir.0-0/mdtest_tree.0.0/file.mdtest.0.0 to MDT0 stripe count 1
/mnt/lustre/rajeevm/test_dir/#test-dir.0-0/mdtest_tree.0.0/dir.mdtest.0.0 migrated to MDT0 already
lfs migrate: cb_migrate_mdt_fini: error completing migration of /mnt/lustre/rajeevm/test_dir: Directory not empty (39)