[Samba] Memory leak in 3.0.22?

[Mark Cullen]

Hi,

I have just switched from FreeBSD 4.11 using 3.0.21b to NetBSD 3.0.1 
using 3.0.22. With the same configuration, and the same clients, I am 
now seeing what appears to be some rather large memory leakage [ I am 
not sure if this is the fault of Samba or NetBSD ]. Eventually the 
process will run out of memory (machine only has 256MB of RAM) and the 
Windows clients (2000, SP4 and all the latest updates) pop up a message:

"Insufficient system resources exist to complete the requested service"

At which point the Samba server becomes unresponsive to the current user 
logged in. At the same time, I am seeing alot of errors in the logs 
regarding memory allocation errors:

---
[..snip extract..]

[2006/06/25 22:03:48, 0] lib/util.c:Realloc(969)
   Memory allocation error: failed to expand to 4896 bytes
[2006/06/25 22:03:48, 0] lib/util.c:Realloc(969)
   Memory allocation error: failed to expand to 4896 bytes
[2006/06/25 22:03:48, 0] lib/util.c:Realloc(969)
   Memory allocation error: failed to expand to 4896 bytes
[2006/06/25 22:03:58, 0] lib/util.c:Realloc(969)
   Memory allocation error: failed to expand to 4136 bytes
[2006/06/25 22:03:58, 0] lib/util.c:Realloc(969)
   Memory allocation error: failed to expand to 4136 bytes
[2006/06/25 22:03:58, 0] lib/util.c:Realloc(969)
   Memory allocation error: failed to expand to 4136 bytes
[2006/06/25 22:03:58, 0] lib/util.c:Realloc(969)
   Memory allocation error: failed to expand to 4136 bytes
[2006/06/25 22:03:58, 0] lib/util.c:Realloc(969)
   Memory allocation error: failed to expand to 4136 bytes
[2006/06/25 22:03:59, 0] lib/util.c:Realloc(969)
   Memory allocation error: failed to expand to 4120 bytes
[2006/06/25 22:03:59, 0] lib/util.c:Realloc(969)
   Memory allocation error: failed to expand to 4120 bytes
---

The smbd process memory usage according to `top` at this time:

---
28795 admin       2    0   130M   58M select     5:31  0.00%  0.00% smbd
---

I never had this problem with FreeBSD 4.11 and 3.0.21b. Another user 
logged in is currently sitting at:

---
10090 donna       2    0    52M 2704K select     3:25  0.00%  0.00% smbd
---

I have logged back on and I am instantly seeing:

---
25971 admin       2    0    24M 4040K select     0:22  0.00%  0.00% smbd
---

Something doesn't seem quite right here!


I'm not sure what kind of info you need, but I have attached my smb.conf 
(it's a bit messy, perhaps this issue is just a misconfiguration 
somewhere?) to get started. If anything else is required (it didn't dump 
a core so I have no backtrace or anything) I will try my best to provide it.

---
#======================= Global Settings 
=====================================
[global]
         workgroup = PIE-NET
         netbios name = BONE
         server string = Login Server
         hosts allow = 10. 127.
         log file = /var/log/samba/samba.%m
         max log size = 500

         csc policy = disable

         security = user
         encrypt passwords = yes
         passdb backend = smbpasswd
#       socket options = TCP_NODELAY SO_RCVBUF=65535 SO_SNDBUF=65535
#       interfaces = 10.0.0.0/8 127.0.0.0/8
         os level = 34
         local master = yes
         domain master = yes
         preferred master = yes
         domain logons = yes
         logon script = %G\connect.bat
         logon path = \\%L\profiles\%u
         logon home = \\%L\nt

         null passwords = yes
#       unix password sync = yes
#       passwd program = /usr/bin/passwd %u

         utmp = no
         nt acl support = yes

#============================ Share Definitions 
==============================

[unix]
         comment = Unix Home
         volume = Unix Home
         path = /home/%u
         read only = no
         directory mode = 0700
         create mode = 0700

[nt]
         comment = NT Home
         volume = NT Home
         path = /home/%u/.NT
         read only = no
         directory mode = 0700
         create mode = 0700
         csc policy = disable

[userhome]
         comment = User Homes
         path = /home
         browsable = no
         read only = no
         admin users = @admin
         valid users = @admin
         csc policy = disable

[netlogon]
         comment = Network Logon Service
         path = /samba/netlogon
         browsable = no
         read only = no
         directory mode = 0755
         create mode = 0755
         acl check permissions = no
         map readonly = yes
         csc policy = disable

[profiles]
         comment = Samba Roaming Profiles
         path = /samba/profiles
         browsable = no
         read only = no
         create mode = 0700
         directory mode = 0700
         admin users = @admin
         profile acls = no
         csc policy = disable

[www]
         comment = WWW
         path = /var/www
         browsable = no
         read only = no
         valid users = @admin
         admin users = @admin
         csc policy = disable

[vh]
         comment = Virtual Hosts
         path = /var/vh
         read only = no
         admin users = @admin
         valid users = @admin
         browsable = no
         csc policy = disable

[admtools]
         comment = Administration Tools
         path = /samba/admtools
         browsable = no
         read only = no
         admin users = @admin
         valid users = @admin
         csc policy = disable

[spare]
         comment = RAID left over
         path = /spare
         browsable = no
         read only = no
         admin users = @admin
         valid users = @admin
         create mode = 0700
         directory mode = 0700
         csc policy = disable

Thanks in advance,
Mark