The memory maybe leak in samba 4.3.11

[Zhangxiaoxu]

Hi,

SCENE:
Client A and Client B write data to an share.
Client B open the share with windows explorer.

Problem:
The RES of smbd grows quickly.
     $ top
PID USER      PR  NI    VIRT    RES    SHR S  %CPU %MEM     TIME+ COMMAND        CODE    DATA
2913029 nobody    20   0 1664536 1.204g  16608 D   0.0  1.3   5:09.21 smbd            64        1318580

Process 2913029 is the connection of client B.
The DATA also grows quickly.

Use smbcontrol, we found smbd process not talloc so much memory.
$ smbcontrol 2913029 pool-usage
full talloc report on 'null_context' (total  92353 bytes in 1274 blocks)

  From logs, we found there a lot of 0x310(maybe MSG_PVFS_NOTIFY) message from the ctdb.

Environment:
Ubuntu 14.04
Samba 4.3.11
Windows 7 Client

Configuration:
clustering = yes
    ctdbd socket = /var/run/ctdb/ctdbd.socket
   max protocol = SMB3
   large readwrite = yes
   idmap config *:range = 1000000-1999999
   log level = 2
   use sendfile = yes
   store dos attributes = yes
   acl_xattr:ignore system acls = yes
   aio read size = 1024
   deadtime = 10

Is this an exist problem?
Could you give us some suggestion about how to find the root cause about the problem.

Br,
Zhang Xiaoxu.
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