[Samba] Samba 3.0.23c PANIC during registering computer into domain

[Marcin Giedz]

Hello,

Recently I've had a chance to test samba 3.0.23c on debian etch 
(unstable) with LDAP as PDC. I found two problems, however I'd like to 
describe the second one:
1) I added users to LDAP so I could connect and I was able to authorize 
myself in samba via LDAP
2) I added my computer to LDAP but didn't check the SambaSID for my 
machine - in fact it was different than sambaSID for PDC.... but this 
oversight caused another PANIC in smbd. So I compiled samba with 
--enable-debug --enable-developer to get some details. Here is what I found:

[2006/11/13 17:02:23, 0] smbd/sec_ctx.c:push_sec_ctx(194)
  Security context stack overflow!
[2006/11/13 17:02:23, 0] lib/util.c:smb_panic(1586)
  smb_panic: clobber_region() last called from [account_policy_get(322)]
[2006/11/13 17:02:23, 0] lib/util.c:smb_panic(1592)
  PANIC (pid 21823): Security context stack overflow!
 
[2006/11/13 17:02:23, 0] lib/util.c:log_stack_trace(1699)
  BACKTRACE: 64 stack frames:
   #0 /opt/samba-3.0.23c/sbin/smbd(log_stack_trace+0x2b) [0x757b730c]
   #1 /opt/samba-3.0.23c/sbin/smbd(smb_panic+0x11e) [0x757b7136]
   #2 /opt/samba-3.0.23c/sbin/smbd(push_sec_ctx+0x8f) [0x7560cd12]
   #3 /opt/samba-3.0.23c/sbin/smbd(become_root+0x17) [0x7560035e]
   #4 /opt/samba-3.0.23c/sbin/smbd [0x7576ddf8]
   #5 /opt/samba-3.0.23c/sbin/smbd [0x7576d4d9]
   #6 /opt/samba-3.0.23c/sbin/smbd(pdb_sid_to_id+0x34) [0x7576cade]
   #7 /opt/samba-3.0.23c/sbin/smbd(sid_to_gid+0x176) [0x75773722]
   #8 /opt/samba-3.0.23c/sbin/smbd(pdb_set_group_sid+0x77) [0x757643bd]
   #9 /opt/samba-3.0.23c/sbin/smbd(pdb_set_group_sid_from_rid+0xf5) 
[0x7576ff84]
   #10 /opt/samba-3.0.23c/sbin/smbd(init_sam_from_buffer_v3+0x99a) 
[0x757686cf]
   #11 /opt/samba-3.0.23c/sbin/smbd(pdb_copy_sam_account+0x81) [0x757694b4]
   #12 /opt/samba-3.0.23c/sbin/smbd(pdb_getsampwsid+0x10d) [0x7576ace0]
   #13 /opt/samba-3.0.23c/sbin/smbd [0x7576de0d]
   #14 /opt/samba-3.0.23c/sbin/smbd [0x7576d4d9]
   #15 /opt/samba-3.0.23c/sbin/smbd(pdb_sid_to_id+0x34) [0x7576cade]
   #16 /opt/samba-3.0.23c/sbin/smbd(sid_to_gid+0x176) [0x75773722]
   #17 /opt/samba-3.0.23c/sbin/smbd(pdb_set_group_sid+0x77) [0x757643bd]
   #18 /opt/samba-3.0.23c/sbin/smbd(pdb_set_group_sid_from_rid+0xf5) 
[0x7576ff84]
   #19 /opt/samba-3.0.23c/sbin/smbd(init_sam_from_buffer_v3+0x99a) 
[0x757686cf]
   #20 /opt/samba-3.0.23c/sbin/smbd(pdb_copy_sam_account+0x81) [0x757694b4]
   #21 /opt/samba-3.0.23c/sbin/smbd(pdb_getsampwsid+0x10d) [0x7576ace0]
   #22 /opt/samba-3.0.23c/sbin/smbd [0x7576de0d]
   #23 /opt/samba-3.0.23c/sbin/smbd [0x7576d4d9]
   #24 /opt/samba-3.0.23c/sbin/smbd(pdb_sid_to_id+0x34) [0x7576cade]
   #25 /opt/samba-3.0.23c/sbin/smbd(sid_to_gid+0x176) [0x75773722]
   #26 /opt/samba-3.0.23c/sbin/smbd(pdb_set_group_sid+0x77) [0x757643bd]
   #27 /opt/samba-3.0.23c/sbin/smbd(pdb_set_group_sid_from_rid+0xf5) 
[0x7576ff84]
   #28 /opt/samba-3.0.23c/sbin/smbd(init_sam_from_buffer_v3+0x99a) 
[0x757686cf]
   #29 /opt/samba-3.0.23c/sbin/smbd(pdb_copy_sam_account+0x81) [0x757694b4]
   #30 /opt/samba-3.0.23c/sbin/smbd(pdb_getsampwsid+0x10d) [0x7576ace0]
   #31 /opt/samba-3.0.23c/sbin/smbd [0x7576de0d]
   #32 /opt/samba-3.0.23c/sbin/smbd [0x7576d4d9]
   #33 /opt/samba-3.0.23c/sbin/smbd(pdb_sid_to_id+0x34) [0x7576cade]
   #34 /opt/samba-3.0.23c/sbin/smbd(sid_to_gid+0x176) [0x75773722]
   #35 /opt/samba-3.0.23c/sbin/smbd(pdb_set_group_sid+0x77) [0x757643bd]
   #36 /opt/samba-3.0.23c/sbin/smbd(pdb_set_group_sid_from_rid+0xf5) 
[0x7576ff84]
   #37 /opt/samba-3.0.23c/sbin/smbd(init_sam_from_buffer_v3+0x99a) 
[0x757686cf]
   #38 /opt/samba-3.0.23c/sbin/smbd(pdb_copy_sam_account+0x81) [0x757694b4]
   #39 /opt/samba-3.0.23c/sbin/smbd(pdb_getsampwsid+0x10d) [0x7576ace0]
   #40 /opt/samba-3.0.23c/sbin/smbd [0x7576de0d]
   #41 /opt/samba-3.0.23c/sbin/smbd [0x7576d4d9]
   #42 /opt/samba-3.0.23c/sbin/smbd(pdb_sid_to_id+0x34) [0x7576cade]
   #43 /opt/samba-3.0.23c/sbin/smbd(sid_to_gid+0x176) [0x75773722]
   #44 /opt/samba-3.0.23c/sbin/smbd(pdb_set_group_sid+0x77) [0x757643bd]
   #45 /opt/samba-3.0.23c/sbin/smbd(pdb_set_group_sid_from_rid+0xf5) 
[0x7576ff84]
   #46 /opt/samba-3.0.23c/sbin/smbd(init_sam_from_buffer_v3+0x99a) 
[0x757686cf]
   #47 /opt/samba-3.0.23c/sbin/smbd(pdb_copy_sam_account+0x81) [0x757694b4]
   #48 /opt/samba-3.0.23c/sbin/smbd(pdb_getsampwsid+0x10d) [0x7576ace0]
   #49 /opt/samba-3.0.23c/sbin/smbd [0x7576de0d]
   #50 /opt/samba-3.0.23c/sbin/smbd [0x7576d4d9]
   #51 /opt/samba-3.0.23c/sbin/smbd(pdb_sid_to_id+0x34) [0x7576cade]
   #52 /opt/samba-3.0.23c/sbin/smbd(sid_to_gid+0x176) [0x75773722]
   #53 /opt/samba-3.0.23c/sbin/smbd(pdb_set_group_sid+0x77) [0x757643bd]
   #54 /opt/samba-3.0.23c/sbin/smbd(pdb_set_group_sid_from_rid+0xf5) 
[0x7576ff84]
   #55 /opt/samba-3.0.23c/sbin/smbd(init_sam_from_buffer_v3+0x99a) 
[0x757686cf]
   #56 /opt/samba-3.0.23c/sbin/smbd(pdb_copy_sam_account+0x81) [0x757694b4]
   #57 /opt/samba-3.0.23c/sbin/smbd(pdb_getsampwsid+0x10d) [0x7576ace0]
   #58 /opt/samba-3.0.23c/sbin/smbd [0x7576de0d]
   #59 /opt/samba-3.0.23c/sbin/smbd [0x7576d4d9]
   #60 /opt/samba-3.0.23c/sbin/smbd(pdb_sid_to_id+0x34) [0x7576cade]
   #61 /opt/samba-3.0.23c/sbin/smbd(sid_to_gid+0x176) [0x75773722]
   #62 /opt/samba-3.0.23c/sbin/smbd(pdb_set_group_sid+0x77) [0x757643bd]
   #63 /opt/samba-3.0.23c/sbin/smbd(pdb_set_group_sid_from_rid+0xf5) 
[0x7576ff84]
[2006/11/13 17:02:23, 0] lib/util.c:smb_panic(1600)
  smb_panic(): calling panic action [/bin/sleep 999999999]

Then I changed sambaSID in my machine entry in LDAP to the GOOD one so 
machine sambaSID = PDC sambaSID and I was able to register my computer 
into my domain. I know this was my fault but it (PANIC) shouldn't have 
happened anyway. If you (developers) need more info let me know. 
Nowadays I can reproduce this error.

Best regards,
Marcin
ARISE