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[Samba] Memory leak samba 4.4.5 and authentications errors




Hi,

We are using samba 4.4.5, and we detected two issue, and we are not sure if
both errors are related...


1) memory leak
I have detected that It seems that samba 4.4.5 (AD mode) has a memory leak,
because after some time memory usage is very high, for example with an
environment with 150 users  and Samba server with 2GB RAM after 222 days
up, is using swap, and memory is increasing continuously...

I have searched in changelog of samba 4.4.10 but any clear information
about memory leaks, and before to upgrade we like to ensure if this is
solved or not...

Actual server is Debian 8 with samba 4.4.5 compiled form sources and
additional information with high memory usage is:

# free -m
             total       used       free     shared    buffers     cached
Mem:          2010       1770        239         40        519        623
-/+ buffers/cache:        627       1382
Swap:         2076        *523       *1553

root@samba4:~# ps auxf | egrep "samba|smbd|winbindd"
root     10925  0.0  0.0  12728  2040 pts/0    S+   10:45   0:00
 \_ grep -E samba|smbd|winbindd
root      3639  0.0  0.4 540524  9020 ?        Ss    2016   0:15
/usr/local/samba/sbin/samba -D
root      3657  0.0  0.2 540524  4904 ?        S     2016   0:00  \_
/usr/local/samba/sbin/samba -D
root      3661  0.0  0.4 513240 10204 ?        Ss    2016   6:50  |   \_
/usr/local/samba/sbin/smbd -D --option=server role check:inhibit=yes
--foreground
root      3673  0.0  0.3 503500  7976 ?        S     2016  74:21  |
\_ /usr/local/samba/sbin/smbd -D --option=server role check:inhibit=yes
--foreground
root      3674  0.0  0.1 503508  3276 ?        S     2016   0:17  |
\_ /usr/local/samba/sbin/smbd -D --option=server role check:inhibit=yes
--foreground
root      3679  0.0  0.1 513240  3476 ?        S     2016   0:53  |
\_ /usr/local/samba/sbin/smbd -D --option=server role check:inhibit=yes
--foreground
root     14383  0.0  1.4 533324 29804 ?        S    Mar03   0:02  |
\_ /usr/local/samba/sbin/smbd -D --option=server role check:inhibit=yes
--foreground
DOMAIN\31+  1984  1.0  2.4 533964 49976 ?        S    Mar08  74:12  |
\_ /usr/local/samba/sbin/smbd -D --option=server role check:inhibit=yes
--foreground
DOMAIN\32+  5343  0.7  2.7 537760 56696 ?        S    06:57   1:38  |
\_ /usr/local/samba/sbin/smbd -D --option=server role check:inhibit=yes
--foreground
root      7161  0.1  2.4 533964 49888 ?        S    08:12   0:10  |
\_ /usr/local/samba/sbin/smbd -D --option=server role check:inhibit=yes
--foreground
root      7171  0.0  1.5 533972 32760 ?        S    08:14   0:00  |
\_ /usr/local/samba/sbin/smbd -D --option=server role check:inhibit=yes
--foreground
root      8837  0.0  1.9 533964 39404 ?        S    09:22   0:00  |
\_ /usr/local/samba/sbin/smbd -D --option=server role check:inhibit=yes
--foreground
DOMAIN\sr+ 10920  0.2  1.4 536512 30596 ?        S    10:44   0:00  |
\_ /usr/local/samba/sbin/smbd -D --option=server role check:inhibit=yes
--foreground
root      3658  0.2  1.0 553932 20888 ?        S     2016 616:00  \_
/usr/local/samba/sbin/samba -D
root      3659  0.0  0.6 544676 12800 ?        S     2016   3:35  \_
/usr/local/samba/sbin/samba -D
root      3660  0.0  0.2 540524  4952 ?        S     2016   0:14  \_
/usr/local/samba/sbin/samba -D
root      3662  0.0  2.0 555616 42616 ?        S     2016 104:33  \_
/usr/local/samba/sbin/samba -D
root      3663  0.0  0.5 540524 10892 ?        S     2016  12:07  \_
/usr/local/samba/sbin/samba -D
root      3664  0.0  2.8 915716 59188 ?        S     2016  79:00  \_
/usr/local/samba/sbin/samba -D
root      3665  0.0  0.5 540524 10888 ?        S     2016  83:37  \_
/usr/local/samba/sbin/samba -D
root      3666  0.0  0.2 540524  4956 ?        S     2016   0:00  \_
/usr/local/samba/sbin/samba -D
root      3667  0.0  0.6 466468 14352 ?        Ss    2016  19:52  |   \_
/usr/local/samba/sbin/winbindd -D --option=server role check:inhibit=yes
--foreground
root      3675  0.0  0.5 478496 10776 ?        S     2016  62:22  |
\_ /usr/local/samba/sbin/winbindd -D --option=server role check:inhibit=yes
--foreground
root      3677  0.0  0.7 469044 15280 ?        S     2016   0:22  |
\_ /usr/local/samba/sbin/winbindd -D --option=server role check:inhibit=yes
--foreground
root      9546  0.0  0.4 478996  9740 ?        S     2016   0:22  |
\_ /usr/local/samba/sbin/winbindd -D --option=server role check:inhibit=yes
--foreground
root      3668  0.0  0.4 543072  9744 ?        S     2016   0:20  \_
/usr/local/samba/sbin/samba -D
root      3669  0.0  1.4 543072 29728 ?        S     2016  34:56  \_
/usr/local/samba/sbin/samba -D
root      3670  0.0  0.4 540524 10004 ?        S     2016   5:21  \_
/usr/local/samba/sbin/samba -D

I can give more information if is needed

2) random errors locked accounts
Users are reporting raondom errors with authentications, in some situations
users can't login, and they have entered correctly password, but they
receive a message that account is locked, and after 2 minutes they can
login with same password that in previou attempts was refused...
We don't know how to reproduce this error and how to debug and give any
interesting information to find the problem...

What can I do?


I'm not sure if bot errors are related...

Anybody can help?

Thanks
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