ERROR: set_share_mode failed ?!?

[Giovanni Beani]

Hi all,
could someone tell me how means the following message found in the log file
of smbd:

ERROR: set_share_mode: failed to ftruncate share mode file
/usr/local/samba/var/
lock/share.119543296.53387 to size 65 (Permission denied)

I run SAMBA 1.9.18p3 on a HP-UX 09.07!

Thanks in advance.