at around Jul 4 01:20:37, I've seen the console is saying:

afpd[14999]: cnid_open: dbenv->open (rw) of /home/hoge/root/.AppleDB failed: Resource temporarily unavailable
afpd[14999]: cnid_open: dbenv->open of /home/hoge/root/.AppleDB failed: Resource temporarily unavailable
afpd[14999]: Cannot open CNID db at [/home/hoge/root].
afpd[14999]: Fatal error: cannot open CNID or invalid CNID backend for /home/hoge/root: cdb

afpd[22229]: cnid_open: dbenv->open (rw) of /home/hoge/root/.AppleDB failed: Resource temporarily unavailable
afpd[22229]: cnid_open: dbenv->open of /home/hoge/root/.AppleDB failed: Resource temporarily unavailable
afpd[22229]: Cannot open CNID db at [/home/hoge/root].
afpd[22229]: Fatal error: cannot open CNID or invalid CNID backend for /home/hoge/root: cdb

afpd[1514]: cnid_open: dbenv->open (rw) of /home/hoge/root/.AppleDB failed: Resource temporarily unavailable
afpd[1514]: cnid_open: dbenv->open of /home/hoge/root/.AppleDB failed: Resource temporarily unavailable
afpd[1514]: Cannot open CNID db at [/home/hoge/root].
afpd[1514]: Fatal error: cannot open CNID or invalid CNID backend for /home/hoge/root: cdb

I remember followin operation fixed the problem.

rm -rf /home/hoge/root/.AppleDB

( I don't know what happened and why.)

The version is:

netatalk-2.0.3nb1 Netatalk appletalk file and print services