ProFTP: Meldung renaming '/dstXXXfokibU' to ... failed

[GwenDragon]

proftp 1.3.4c (Plesk 11.5, Debian 7.2) meldet ins daemon.log öfters sowas:

Dec 12 15:52:54 server2 proftpd[24814]: 213.*.***.** (84.147.*.*[84.147.**.*]) - FTP session opened.
Dec 12 15:52:54 server2 proftpd[24814]: 213.*.***.** (84.147.*.*[84.147.**.*]) - Preparing to chroot to directory '/var/www/vhosts/*****.de/w2.******.de'
Dec 12 15:41:15 server2 proftpd[23513]: 213.*.***.** (84.147.*.*[84.147.**.*]) - renaming '/dstXXXfokibU' to '/scripts' failed: Directory not empty

Das passiert bei Uploads von Verzeichnissen.

Seltsamerweise ist im Client kein Fehler angezeigt.

DebugLeve 4 liefert dann in daemon.log:

Dec 12 16:03:14 server2 proftpd[25417]: 213.133.*.* (84.147.*.*[84.147.*.*]) - passive data connection opened - local  : 213.133.*.*:54744
Dec 12 16:03:14 server2 proftpd[25417]: 213.133.*.* (84.147.*.*[84.147.*.*]) - passive data connection opened - remote : 84.147.*.*:59027
Dec 12 16:03:15 server2 proftpd[25417]: 213.133.*.* (84.147.*.*[84.147.*.*]) - dispatching POST_CMD command 'LIST -a' to mod_ratio
Dec 12 16:03:15 server2 proftpd[25417]: 213.133.*.* (84.147.*.*[84.147.*.*]) - dispatching LOG_CMD command 'LIST -a' to mod_log
Dec 12 16:03:15 server2 proftpd[25417]: 213.133.*.* (84.147.*.*[84.147.*.*]) - dispatching LOG_CMD command 'LIST -a' to mod_ls
Dec 12 16:03:15 server2 proftpd[25417]: 213.133.*.* (84.147.*.*[84.147.*.*]) - dispatching PRE_CMD command 'MKD tmp' to mod_tls
Dec 12 16:03:15 server2 proftpd[25417]: 213.133.*.* (84.147.*.*[84.147.*.*]) - dispatching PRE_CMD command 'MKD tmp' to mod_core
Dec 12 16:03:15 server2 proftpd[25417]: 213.133.*.* (84.147.*.*[84.147.*.*]) - dispatching PRE_CMD command 'MKD tmp' to mod_core
Dec 12 16:03:15 server2 proftpd[25417]: 213.133.*.* (84.147.*.*[84.147.*.*]) - dispatching PRE_CMD command 'MKD tmp' to mod_quotatab
Dec 12 16:03:15 server2 proftpd[25417]: 213.133.*.* (84.147.*.*[84.147.*.*]) - dispatching CMD command 'MKD tmp' to mod_core
Dec 12 16:03:15 server2 proftpd[25417]: 213.133.*.* (84.147.*.*[84.147.*.*]) - lchown(/dstXXXu0qj2H) to GID 1003 successful
Dec 12 16:03:15 server2 proftpd[25417]: 213.133.*.* (84.147.*.*[84.147.*.*]) - renaming '/dstXXXu0qj2H' to '/tmp' failed: Directory not empty
Dec 12 16:03:15 server2 proftpd[25417]: 213.133.*.* (84.147.*.*[84.147.*.*]) - dispatching POST_CMD_ERR command 'MKD tmp' to mod_quotatab
Dec 12 16:03:15 server2 proftpd[25417]: 213.133.*.* (84.147.*.*[84.147.*.*]) - dispatching LOG_CMD_ERR command 'MKD tmp' to mod_log

Eine Erhöhung der DebugLevel bringt nicht mehr zum Problem.

In /opt/psa/var/log/xferlog ist nichts zu finden.

Woran kann das liegen, dass proftp das rename anmeckert?