[Samba] Winbind+ldap = core dump

[Robin]

Hi,
I use samba 3.0.26a on fedora 8 as a fileserver for a win 2k3 domain.  This
has worked fine for about 2 months without any problems.  However I came to
the server 3 days ago and the harddrive was 100% full.  On checking I found
60gb of core dumps in the winbind folder.  I did a lot of searching and
couldnt find anything relevent for this release.  I tried upgrading samba to
3.0.28 (fc8 supplied rpm) and this does the same.  The log.winbindd-idmap
log suggests to me that it has a problem with ldap and empty results, so I
made a quick script to check for gaps in the ldap records and found that
several uid and gid numbers were not assigned (ie there was no entry for
them in ldap, even though there were entries after them).

Winbind does still mostly work just fails once in about every 10 tries.  I
believe it fails for both samba and dovecot (pop3/imap mail server).  At the
moment we are generating about 10gb/hour of core dumps which a cron job is
keeping cleaned up.  Has anyone got any ideas on this? also is it possible
to tell samba/winbind not to do core dumps?

smb.conf (only shown one share as we have lots!):

[global]
printer admin = @"MCS+sysadmin","MCS+root","MCS+administrator"
add machine script = /usr/sbin/useradd -d /dev/null -g samba-clients -s
/bin/false -M %u
server string = Meadows
log level = 1
syslog = 0
#       vfs objects = extd_audit
log file = /var/log/samba/%U.smbd.log
max log size= 100000
printing = cups
update encrypted = Yes
encrypt passwords = Yes
preferred master = no
map to guest = Bad User
name resolve order = lmhosts hosts wins bcast
kernel oplocks = no
oplocks = no
locking = no
level2 oplocks = no
workgroup = MCS
netbios name = MCS3
wins server = 192.168.0.8
wins support = no
wins proxy = no
admin users = "MCS+administrator"
unix extensions = no

security = ADS

lanman auth = yes
client lanman auth = yes
client plaintext auth = yes
idmap uid = 10000-100000
idmap gid = 10000-100000
ldap admin dn = cn=Manager,dc=meadows,dc=derbyshire,dc=sch,dc=uk
ldap idmap suffix = ou=Idmap
ldap suffix = dc=meadows,dc=derbyshire,dc=sch,dc=uk
idmap backend = ldap:ldap://192.168.0.1
winbind use default domain = yes
winbind separator = +
winbind enum groups = yes
winbind enum users = yes
winbind cache time = 60
dns proxy = no
password server = MCS1
template homedir = /home/%G/%U
template shell = /bin/false
realm = MEADOWS.DERBYSHIRE.SCH.UK

[info]
valid users = @"MCS+staff",@"MCS+teacher",@"MCS+sysadmin"
write list = @"MCS+staff",@"MCS+teacher",@"MCS+sysadmin"
path = /school/datadrive
force directory mode = 0777
force create mode = 0666
comment = DataDrive
create mode = 0666
directory mode = 777
browseable = yes

log.winbindd-idmap:

winbindd: ../../../libraries/libldap/getentry.c:48: ldap_next_entry:
Assertion `entry != ((void *)0)' failed.
[2008/02/27 14:54:20, 0] lib/fault.c:fault_report(41)
===============================================================
[2008/02/27 14:54:20, 0] lib/fault.c:fault_report(42)
INTERNAL ERROR: Signal 6 in pid 29940 (3.0.28-0.fc8)
Please read the Trouble-Shooting section of the Samba3-HOWTO
[2008/02/27 14:54:20, 0] lib/fault.c:fault_report(44)

From: http://www.samba.org/samba/docs/Samba3-HOWTO.pdf
[2008/02/27 14:54:20, 0] lib/fault.c:fault_report(45)
===============================================================
[2008/02/27 14:54:20, 0] lib/util.c:smb_panic(1655)
PANIC (pid 29940): internal error
[2008/02/27 14:54:20, 0] lib/util.c:log_stack_trace(1759)
BACKTRACE: 19 stack frames:
#0 winbindd(log_stack_trace+0x2d) [0xb7d515ad]
#1 winbindd(smb_panic+0x5d) [0xb7d516dd]
#2 winbindd [0xb7d3c10a]
#3 [0x12d420]
#4 [0x12d402]
#5 /lib/libc.so.6(gsignal+0x50) [0x2f4690]
#6 /lib/libc.so.6(abort+0x101) [0x2f5f91]
#7 /lib/libc.so.6(__assert_fail+0xee) [0x2ed93e]
#8 /usr/lib/libldap-2.3.so.0(ldap_next_entry+0x9c) [0x29d9fc]
#9 winbindd [0xb7e8afa7]
#10 winbindd(idmap_unixids_to_sids+0x397) [0xb7e84aa7]
#11 winbindd(idmap_uid_to_sid+0x6b) [0xb7e888ab]
#12 winbindd(winbindd_dual_uid2sid+0x61) [0xb7ce9fc1]
#13 winbindd [0xb7ce7202]
#14 winbindd [0xb7ce803f]
#15 winbindd [0xb7cb9459]
#16 winbindd(main+0x94d) [0xb7cb9e4d]
#17 /lib/libc.so.6(__libc_start_main+0xe0) [0x2e1390]
#18 winbindd [0xb7cb80f1]
[2008/02/27 14:54:20, 0] lib/fault.c:dump_core(181)
dumping core in /var/log/samba/cores/winbindd


Thanks
Robin


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