Ceph » rgw

if bucket listing races with a pending index transaction, its suggested removal may be mistakenly applied if that index transaction completes before the osd receives this suggestion

in rgw_dir_suggest_changes(), the sole condition for applying a suggested change is that the cur_disk.pending_map is empty. this is true after rgw_bucket_complete_op()

racing sequence of events in cls/rgw:

rgw_bucket_prepare_op() adds entry to pending_map

rgw_bucket_list() returns entry with pending_map

rgw_bucket_complete_op() completes entry, clears pending_map

rgw_dir_suggest_changes() finds pending_map empty, so applies a suggestion to remove the listed entry