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Since March, 25th in log.smbd started to appear
[2018/03/25 09:02:55.669983, 0]./source3/smbd/process.c:339 (read_packet_remainder)
read_fd_with_timeout failed for client 127.0.0.1 read error = NT_STATUS_END_OF_FILE.
Sometimes on one hundred records a day, sometimes any. On March, 15th the samba was  for March, 4.3.11th and 24 the server has been rebooted - can be connected. The C log level = 10 it looks as
[2018/04/19 12:27:02.394513, 3]./source3/lib/access.c:338 (allow_access)
Allowed connection from 127.0.0.1 (127.0.0.1)
[2018/04/19 12:27:02.394888, 3]./source3/param/loadparm.c:3754 (lp_load_ex)
lp_load_ex: refreshing parameters
[2018/04/19 12:27:02.395091, 3]./source3/param/loadparm.c:548 (init_globals)
Initialising global parameters
[2018/04/19 12:27:02.395677, 3]./source3/param/loadparm.c:2683 (lp_do_section)
Processing section "[global]"
[2018/04/19 12:27:02.396265, 2]./source3/param/loadparm.c:2700 (lp_do_section)
Processing section "[u]"
[2018/04/19 12:27:02.396464, 2]./source3/param/loadparm.c:2700 (lp_do_section)
Processing section "[htpc]"
[2018/04/19 12:27:02.396647, 2]./source3/param/loadparm.c:2700 (lp_do_section)
Processing section "[backup]"
[2018/04/19 12:27:02.396898, 3]./source3/param/loadparm.c:1600 (lp_add_ipc)
adding IPC service
[2018/04/19 12:27:02.397241, 2]./source3/lib/interface.c:341 (add_interface)
added interface eth2 ip=192.168.1.3 bcast=192.168.1.255 netmask=255.255.255.0
[2018/04/19 12:27:02.397411, 3]./source3/smbd/oplock.c:1310 (init_oplocks)
init_oplocks: initializing messages.
[2018/04/19 12:27:32.391894, 0]./source3/smbd/process.c:339 (read_packet_remainder)
read_fd_with_timeout failed for client 127.0.0.1 read error = NT_STATUS_END_OF_FILE.
[2018/04/19 12:27:32.392569, 3]./source3/smbd/server_exit.c:252 (exit_server_common)
Server exit (failed to receive smb request)
[2018/04/19 12:31:32.815377, 2]./source3/smbd/server.c:467 (remove_child_pid)
Could not find child 4423 - ignoring
I do not see anything useful. smbstatus, launched while all it happens (from ' tail-n 0-f log.smbd | (while read f; do echo $f; smbstatus; done) ') shows nothing. How to catch the originator? And whether costs?  14.04