Segmentation fault when trying to do a domain backup online

Hi folks,

I'm trying to do a domain backup online. Functional level and domain 
level both 2016. OS Debian 13. Samba 4.23.6 from Trixie backports. The 
whole conversation (redacted) is displayed below.

If somebody could help me with this, I would be grateful.

Best regards,

Peter

administrator@nuctest:~$ samba-tool domain backup online 
--server=domsrv3.private.talps --targetdir=.
INFO 2026-04-27 17:06:47,025 pid:73460 
/usr/lib/python3/dist-packages/samba/join.py #1650: workgroup is PRIVATE
INFO 2026-04-27 17:06:47,026 pid:73460 
/usr/lib/python3/dist-packages/samba/join.py #1653: realm is private.talps
Calling bare provision
INFO 2026-04-27 17:06:47,035 pid:73460 
/usr/lib/python3/dist-packages/samba/provision/__init__.py #2112: 
Looking up IPv4 addresses
INFO 2026-04-27 17:06:47,036 pid:73460 
/usr/lib/python3/dist-packages/samba/provision/__init__.py #2129: 
Looking up IPv6 addresses
WARNING 2026-04-27 17:06:47,036 pid:73460 
/usr/lib/python3/dist-packages/samba/provision/__init__.py #2136: No 
IPv6 address will be assigned
INFO 2026-04-27 17:06:47,286 pid:73460 
/usr/lib/python3/dist-packages/samba/provision/__init__.py #2302: 
Setting up share.ldb
INFO 2026-04-27 17:06:47,312 pid:73460 
/usr/lib/python3/dist-packages/samba/provision/__init__.py #2306: 
Setting up secrets.ldb
INFO 2026-04-27 17:06:47,332 pid:73460 
/usr/lib/python3/dist-packages/samba/provision/__init__.py #2311: 
Setting up the registry
INFO 2026-04-27 17:06:47,368 pid:73460 
/usr/lib/python3/dist-packages/samba/provision/__init__.py #2314: 
Setting up the privileges database
INFO 2026-04-27 17:06:47,398 pid:73460 
/usr/lib/python3/dist-packages/samba/provision/__init__.py #2317: 
Setting up idmap db
INFO 2026-04-27 17:06:47,429 pid:73460 
/usr/lib/python3/dist-packages/samba/provision/__init__.py #2324: 
Setting up SAM db
INFO 2026-04-27 17:06:47,439 pid:73460 
/usr/lib/python3/dist-packages/samba/provision/__init__.py #887: Setting 
up sam.ldb partitions and settings
INFO 2026-04-27 17:06:47,441 pid:73460 
/usr/lib/python3/dist-packages/samba/provision/__init__.py #899: Setting 
up sam.ldb rootDSE
INFO 2026-04-27 17:06:47,450 pid:73460 
/usr/lib/python3/dist-packages/samba/provision/__init__.py #1312: 
Pre-loading the Samba 4 and AD schema
Unable to determine the DomainSID, can not enforce uniqueness constraint 
on local domainSIDs

INFO 2026-04-27 17:06:47,486 pid:73460 
/usr/lib/python3/dist-packages/samba/provision/__init__.py #2425: A 
Kerberos configuration suitable for Samba AD has been generated at 
/home/administrator/tmpmi8dxlwp/private/krb5.conf
INFO 2026-04-27 17:06:47,486 pid:73460 
/usr/lib/python3/dist-packages/samba/provision/__init__.py #2427: Merge 
the contents of this file with your system krb5.conf or replace it with 
this one. Do not create a symlink!
Provision OK for domain DN DC=private,DC=talps
INFO 2026-04-27 17:06:47,494 pid:73460 
/usr/lib/python3/dist-packages/samba/join.py #973: Starting replication
Using DS_BIND_GUID_W2K3
Schema-DN[CN=Schema,CN=Configuration,DC=private,DC=talps] 
objects[402/1783] linked_values[0/0]
Schema-DN[CN=Schema,CN=Configuration,DC=private,DC=talps] 
objects[804/1783] linked_values[0/0]
Schema-DN[CN=Schema,CN=Configuration,DC=private,DC=talps] 
objects[1206/1783] linked_values[0/0]
Schema-DN[CN=Schema,CN=Configuration,DC=private,DC=talps] 
objects[1599/1783] linked_values[0/0]
Schema-DN[CN=Schema,CN=Configuration,DC=private,DC=talps] 
objects[1783/1783] linked_values[0/0]
Analyze and apply schema objects
Partition[CN=Configuration,DC=private,DC=talps] objects[402/2904] 
linked_values[0/74]
Partition[CN=Configuration,DC=private,DC=talps] objects[804/2904] 
linked_values[0/74]
Partition[CN=Configuration,DC=private,DC=talps] objects[1206/2904] 
linked_values[0/74]
Partition[CN=Configuration,DC=private,DC=talps] objects[1608/2904] 
linked_values[0/74]
Partition[CN=Configuration,DC=private,DC=talps] objects[1924/2904] 
linked_values[74/74]
dsdb_replicated_objects_convert: Ignoring object outside partition 
e6c65d1b-902a-412e-88b5-46a551de1d8b 
CN=Schema,CN=Configuration,DC=private,DC=talps: 
WERR_DS_ADD_REPLICA_INHIBITED
Replicating critical objects from the base DN of the domain
Partition[DC=private,DC=talps] objects[114/161] linked_values[10/120]
Partition[DC=private,DC=talps] objects[304/3255] linked_values[123/120]
===============================================================
INTERNAL ERROR: Signal 11: Segmentation fault in  () () pid 73460 
(4.23.6-Debian-4.23.6+dfsg-2~bpo13+1)
If you are running a recent Samba version, and if you think this problem 
is not yet fixed in the latest versions, please consider reporting this 
bug, see https://wiki.samba.org/index.php/Bug_Reporting
===============================================================
PANIC (pid 73460): Signal 11: Segmentation fault in 
4.23.6-Debian-4.23.6+dfsg-2~bpo13+1
BACKTRACE: 35 stack frames:
  #0 
/usr/lib/x86_64-linux-gnu/samba/libgenrand-private-samba.so.0(log_stack_trace+0x2d) 
[0x7fcb547aa5bd]
  #1 
/usr/lib/x86_64-linux-gnu/samba/libgenrand-private-samba.so.0(smb_panic+0xd) 
[0x7fcb547aa85d]
  #2 
/usr/lib/x86_64-linux-gnu/samba/libgenrand-private-samba.so.0(+0x28f5) 
[0x7fcb547aa8f5]
  #3 /lib/x86_64-linux-gnu/libc.so.6(+0x3fdf0) [0x7fcb55242df0]
  #4 /usr/lib/x86_64-linux-gnu/samba/ldb/repl_meta_data.so(+0xa7c6) 
[0x7fcb4d6c07c6]
  #5 
/usr/lib/x86_64-linux-gnu/samba/libldb-key-value-private-samba.so.0(+0x6eae) 
[0x7fcb4d816eae]
  #6 
/lib/x86_64-linux-gnu/libtevent.so.0(tevent_common_invoke_timer_handler+0xef) 
[0x7fcb54899fdf]
  #7 
/lib/x86_64-linux-gnu/libtevent.so.0(tevent_common_loop_timer_delay+0xb3) 
[0x7fcb5489a203]
  #8 /lib/x86_64-linux-gnu/libtevent.so.0(+0xf84b) [0x7fcb5489b84b]
  #9 /lib/x86_64-linux-gnu/libtevent.so.0(+0xd54b) [0x7fcb5489954b]
  #10 /lib/x86_64-linux-gnu/libtevent.so.0(_tevent_loop_once+0x93) 
[0x7fcb548939c3]
  #11 /lib/x86_64-linux-gnu/libldb.so.2(ldb_wait+0x9b) [0x7fcb548bcb2b]
  #12 /lib/x86_64-linux-gnu/libldb.so.2(ldb_extended+0x118) [0x7fcb548bdd68]
  #13 
/lib/x86_64-linux-gnu/libsamdb.so.0(dsdb_replicated_objects_commit+0x25f) 
[0x7fcb4fe8864f]
  #14 
/usr/lib/x86_64-linux-gnu/samba/libsamba-net-join.cpython-313-x86-64-linux-gnu-private-samba.so.0(libnet_vampire_cb_store_chunk+0x5e9) 
[0x7fcb4e2c5e39]
  #15 
/usr/lib/python3/dist-packages/samba/net.cpython-313-x86_64-linux-gnu.so(+0x4d8d) 
[0x7fcb4e6b0d8d]
  #16 /usr/bin/python3() [0x591ceb]
  #17 /usr/bin/python3(PyObject_Vectorcall+0x32) [0x54cf22]
  #18 /usr/bin/python3(_PyEval_EvalFrameDefault+0x95b7) [0x56acf7]
  #19 /usr/bin/python3() [0x5cd43a]
  #20 /usr/bin/python3() [0x5abce5]
  #21 /usr/bin/python3(_PyEval_EvalFrameDefault+0x4008) [0x565748]
  #22 /usr/bin/python3() [0x5cd3c9]
  #23 /usr/bin/python3(_PyEval_EvalFrameDefault+0x4008) [0x565748]
  #24 /usr/bin/python3(PyEval_EvalCode+0xcc) [0x55d48c]
  #25 /usr/bin/python3() [0x6ab8d1]
  #26 /usr/bin/python3() [0x6a899c]
  #27 /usr/bin/python3() [0x6b9943]
  #28 /usr/bin/python3() [0x6b93e3]
  #29 /usr/bin/python3() [0x6b921e]
  #30 /usr/bin/python3(Py_RunMain+0x3c1) [0x6b86f1]
  #31 /usr/bin/python3(Py_BytesMain+0x2b) [0x6838eb]
  #32 /lib/x86_64-linux-gnu/libc.so.6(+0x29ca8) [0x7fcb5522cca8]
  #33 /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0x85) 
[0x7fcb5522cd65]
  #34 /usr/bin/python3(_start+0x21) [0x682c81]
Aborted


-- 
To unsubscribe from this list go to the following URL and read the
instructions:  https://lists.samba.org/mailman/options/samba