[Samba] Samba panics frequently after being configured for AD authentication

[Chris Kukuchka]

Hello,

I had just completed reconfiguring Samba so it would authenticate against Active Directory.  After user side testing seemed successful, I found the log directory on the server was growing quickly and abrtd emails were being sent out.  Unfortunately, I have been unable to track down the cause for these panics and I am looking for help.

The /var/log/messages files contains entries like this posted every few seconds:

[2013/03/13 15:59:02.576390,  0] lib/fault.c:47(fault_report)
  ===============================================================
[2013/03/13 15:59:02.576961,  0] lib/fault.c:48(fault_report)
  INTERNAL ERROR: Signal 11 in pid 24781 (3.6.9-151.el6)
  Please read the Trouble-Shooting section of the Samba3-HOWTO
[2013/03/13 15:59:02.577486,  0] lib/fault.c:50(fault_report)
  
  From: http://www.samba.org/samba/docs/Samba3-HOWTO.pdf
[2013/03/13 15:59:02.577972,  0] lib/fault.c:51(fault_report)
  ===============================================================
[2013/03/13 15:59:02.578512,  0] lib/util.c:1117(smb_panic)
  PANIC (pid 24781): internal error
[2013/03/13 15:59:02.586398,  0] lib/util.c:1221(log_stack_trace)
  BACKTRACE: 25 stack frames:
   #0 smbd(log_stack_trace+0x1a) [0x7f54df3a575a]
   #1 smbd(smb_panic+0x2b) [0x7f54df3a582b]
   #2 smbd(+0x41a2b4) [0x7f54df3962b4]
   #3 /lib64/libc.so.6(+0x34f1632920) [0x7f54dbd17920]
   #4 smbd(_wkssvc_NetWkstaEnumUsers+0x184) [0x7f54df214844]
   #5 smbd(+0x2976f7) [0x7f54df2136f7]
   #6 smbd(+0x31c4b6) [0x7f54df2984b6]
   #7 smbd(process_complete_pdu+0xe0f) [0x7f54df29972f]
   #8 smbd(process_incoming_data+0x128) [0x7f54df29aea8]
   #9 smbd(np_write_send+0x151) [0x7f54df29b341]
   #10 smbd(+0x10ef79) [0x7f54df08af79]
   #11 smbd(+0x10f47b) [0x7f54df08b47b]
   #12 smbd(reply_trans+0x60a) [0x7f54df08c2ea]
   #13 smbd(+0x178604) [0x7f54df0f4604]
   #14 smbd(+0x178a1b) [0x7f54df0f4a1b]
   #15 smbd(+0x178e35) [0x7f54df0f4e35]
   #16 smbd(run_events_poll+0x377) [0x7f54df3b4ad7]
   #17 smbd(smbd_process+0x86d) [0x7f54df0f297d]
   #18 smbd(+0x6998cf) [0x7f54df6158cf]
   #19 smbd(run_events_poll+0x377) [0x7f54df3b4ad7]
   #20 smbd(+0x438f8f) [0x7f54df3b4f8f]
   #21 smbd(_tevent_loop_once+0x90) [0x7f54df3b5310]
   #22 smbd(main+0xf3b) [0x7f54df616bcb]
   #23 /lib64/libc.so.6(__libc_start_main+0xfd) [0x7f54dbd03cdd]
   #24 smbd(+0xf4db9) [0x7f54df070db9]
[2013/03/13 15:59:02.591551,  0] lib/fault.c:345(dump_core)
  Exiting on internal error (core file administratively disabled)
[2013/03/13 15:59:06.004427,  0] lib/fault.c:47(fault_report)


Samba is running on a RedHat Enterprise Linux Server 6.4:
# cat /proc/version
Linux version 2.6.32-279.el6.x86_64 (mockbuild at x86-008.build.bos.redhat.com) (gcc version 4.4.6 20120305 (Red Hat 4.4.6-4) (GCC) ) #1 SMP Wed Jun 13 18:24:36 EDT 2012

# smbd -V
Version 3.6.9-151.el6

# testparm
[global]
	workgroup = DOMAIN
	realm = DOMAIN.LOCAL
	netbios name = MYHOST
	server string = Samba Server Version %v
	security = ADS
	log file = /var/log/samba/log.%m
	max log size = 500
	enable core files = No
	load printers = No
	local master = No
	winbind separator = /
	winbind enum users = Yes
	winbind enum groups = Yes
	winbind use default domain = Yes
	winbind refresh tickets = Yes
	idmap config * : range = 16777216-33554431
	idmap config * : backend = tdb

As you can see above, I have disabled core files.  This was done in an effort to stop the flow of core files from filling up the filesystem.

Aside from disabling Samba, I have been unable to determine what can be done to stop these panics.  Any help would be appreciated.  If you need any further information, please feel free to ask.

Thanks in advance.

Chris Kukuchka
Sequoia Group, Inc.