=== [1] dense window fill (40000 same-CRC32C names, batch=256) ===
(milestone run, stopped after the window held 19818 entries; stock panics
 at 96-112)
created=... errors=0  (every batch through 19456+, zero errors, no panic)
=== milestone state ===
   19818
post-sync:    19818
/dev/vn1@DATA     974848 88192 886656    9%    /mnt/h2632
DENSE_UMOUNT_OK
post-remount dense files:    19818
REMOUNT_UMOUNT_OK
=== [2] natural names (20000 sequential + 2000 random) ===
names=22000 windows=22000 max-per-window=1 windows-with->1=0
DONE created=22000 errors=0
natural files present:    22000
NATURAL_UMOUNT_OK
=== [3] stock roundtrip ===
md5_live=30e0f538caf365edf9e3b43bdb4227e6 md5_remount=30e0f538caf365edf9e3b43bdb4227e6
ROUNDTRIP_MATCH
RT_UMOUNT_OK
VALIDATION2632_COMPLETE
(full logs: fix_validation.log, fix_validation_part2.log; serial console
 shows rate-limited "hammer2: indirect_maint: deferring collapse (nested
 key range)" at 1/s instead of the panic)