[Samba] DNS crashing when accessing with MS DNS tool on Samba with BIND9 backend

Fri Sep 20 11:12:53 UTC 2019

Hi all,

I am currently having some problems managing DNS on our Samba servers
with bind9 backend. Whenever I try to access the AD domain zone from the
MS DNS tool the DNS part crashes and services need to be restarted.
After the crash DNS is not working anymore.

I get the following in log.samba:

[2019/09/20 09:39:10.681745,  0]
../../source4/rpc_server/dnsserver/dcerpc_dnsserver.c:1101(dnsserver_query_zone)
  dnsserver: Invalid zone operation
IsSigned===============================================================
[2019/09/20 09:39:10.693900,  0] ../../lib/util/fault.c:80(fault_report)
  INTERNAL ERROR: Signal 11 in pid 6563 (4.10.9-GIT-e3f51924971)
  Please read the Trouble-Shooting section of the Samba HOWTO
[2019/09/20 09:39:10.694089,  0] ../../lib/util/fault.c:82(fault_report)
  ===============================================================
[2019/09/20 09:39:10.694168,  0]
../../lib/util/fault.c:128(smb_panic_default)
  smb_panic_default: PANIC (pid 6563): internal error
[2019/09/20 09:39:10.695626,  0] ../../lib/util/fault.c:261(log_stack_trace)
  BACKTRACE: 49 stack frames:
   #0 /usr/local/samba/lib/libsamba-util.so.0(log_stack_trace+0x2e)
[0x7fdc478da67f]
   #1 /usr/local/samba/lib/libsamba-util.so.0(+0x22405) [0x7fdc478da405]
   #2 /usr/local/samba/lib/libsamba-util.so.0(log_stack_trace+0)
[0x7fdc478da651]
   #3 /usr/local/samba/lib/libsamba-util.so.0(+0x22307) [0x7fdc478da307]
   #4 /usr/local/samba/lib/libsamba-util.so.0(+0x2231c) [0x7fdc478da31c]
   #5 /lib/x86_64-linux-gnu/libpthread.so.0(+0x12890) [0x7fdc45fcf890]
   #6
/usr/local/samba/lib/private/libldb.so.1(ldb_msg_find_element+0x5e)
[0x7fdc483c57d3]
   #7
/usr/local/samba/lib/private/libldb.so.1(ldb_msg_find_ldb_val+0x23)
[0x7fdc483c68ba]
   #8
/usr/local/samba/lib/private/libldb.so.1(ldb_msg_find_attr_as_string+0x27)
[0x7fdc483c6f80]
   #9 /usr/local/samba/lib/libdcerpc-server.so.0(dns_name_compare+0x4e)
[0x7fdc30b97f22]
   #10 /usr/local/samba/lib/private/libldb.so.1(ldb_qsort+0x31e)
[0x7fdc483d6953]
   #11 /usr/local/samba/lib/libdcerpc-server.so.0(+0x848dc) [0x7fdc30b918dc]
   #12 /usr/local/samba/lib/libdcerpc-server.so.0(+0x85df4) [0x7fdc30b92df4]
   #13 /usr/local/samba/lib/libdcerpc-server.so.0(+0x867b7) [0x7fdc30b937b7]
   #14 /usr/local/samba/lib/libdcerpc-server.so.0(+0x2ac58) [0x7fdc30b37c58]
   #15 /usr/local/samba/lib/libdcerpc-server.so.0(+0x2bcda) [0x7fdc30b38cda]
   #16 /usr/local/samba/lib/libdcerpc-server.so.0(+0x2d6fc) [0x7fdc30b3a6fc]
   #17
/usr/local/samba/lib/private/libtevent.so.0(_tevent_req_notify_callback+0x6a)
[0x7fdc487ff7d2]
   #18 /usr/local/samba/lib/private/libtevent.so.0(+0x8933) [0x7fdc487ff933]
   #19
/usr/local/samba/lib/private/libtevent.so.0(_tevent_req_done+0x25)
[0x7fdc487ff960]
   #20 /usr/local/samba/lib/libdcerpc-binding.so.0(+0xea94) [0x7fdc44c12a94]
   #21
/usr/local/samba/lib/private/libtevent.so.0(_tevent_req_notify_callback+0x6a)
[0x7fdc487ff7d2]
   #22 /usr/local/samba/lib/private/libtevent.so.0(+0x8933) [0x7fdc487ff933]
   #23
/usr/local/samba/lib/private/libtevent.so.0(_tevent_req_done+0x25)
[0x7fdc487ff960]
   #24 /usr/local/samba/lib/private/libsamba-sockets-samba4.so(+0x72e2)
[0x7fdc459b72e2]
   #25 /usr/local/samba/lib/private/libsamba-sockets-samba4.so(+0x751c)
[0x7fdc459b751c]
   #26
/usr/local/samba/lib/private/libtevent.so.0(_tevent_req_notify_callback+0x6a)
[0x7fdc487ff7d2]
   #27 /usr/local/samba/lib/private/libtevent.so.0(+0x8933) [0x7fdc487ff933]
   #28
/usr/local/samba/lib/private/libtevent.so.0(_tevent_req_done+0x25)
[0x7fdc487ff960]
   #29 /usr/local/samba/lib/private/libsamba-sockets-samba4.so(+0x6722)
[0x7fdc459b6722]
   #30
/usr/local/samba/lib/private/libtevent.so.0(_tevent_req_notify_callback+0x6a)
[0x7fdc487ff7d2]
   #31 /usr/local/samba/lib/private/libtevent.so.0(+0x8933) [0x7fdc487ff933]
   #32 /usr/local/samba/lib/private/libtevent.so.0(+0x8a60) [0x7fdc487ffa60]
   #33
/usr/local/samba/lib/private/libtevent.so.0(tevent_common_invoke_immediate_handler+0x184)
[0x7fdc487fe6d5]
   #34
/usr/local/samba/lib/private/libtevent.so.0(tevent_common_loop_immediate+0x37)
[0x7fdc487fe7db]
   #35 /usr/local/samba/lib/private/libtevent.so.0(+0x11e79)
[0x7fdc48808e79]
   #36 /usr/local/samba/lib/private/libtevent.so.0(+0xe70b) [0x7fdc4880570b]
   #37
/usr/local/samba/lib/private/libtevent.so.0(_tevent_loop_once+0x11e)
[0x7fdc487fd17f]
   #38
/usr/local/samba/lib/private/libtevent.so.0(tevent_common_loop_wait+0x25)
[0x7fdc487fd4d1]
   #39 /usr/local/samba/lib/private/libtevent.so.0(+0xe7ad) [0x7fdc488057ad]
   #40
/usr/local/samba/lib/private/libtevent.so.0(_tevent_loop_wait+0x2b)
[0x7fdc487fd574]
   #41 /usr/local/samba/lib/process_model/standard.so(+0x29fd)
[0x7fdc3a9399fd]
   #42
/usr/local/samba/lib/private/libservice-samba4.so(task_server_startup+0x9b)
[0x7fdc481abb11]
   #43 /usr/local/samba/lib/private/libservice-samba4.so(+0x2b05)
[0x7fdc481a9b05]
   #44
/usr/local/samba/lib/private/libservice-samba4.so(server_service_startup+0x162)
[0x7fdc481a9c82]
   #45 samba: task[dcesrv](+0x613e) [0x5638fd65113e]
   #46 samba: task[dcesrv](main+0x3f) [0x5638fd651250]
   #47 /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xe7)
[0x7fdc45bedb97]
   #48 samba: task[dcesrv](_start+0x2a) [0x5638fd64eb0a]
[2019/09/20 09:39:11.350740,  0]
../../source4/smbd/process_standard.c:160(standard_child_pipe_handler)
  standard_child_pipe_handler: Child 6563 (rpc) terminated with signal 6

When I access any other configured non-AD zone on the server the crash
does not happen.

I have already tried to repair the setup with "samba_upgradedns
--dns-backend=BIND9_DLZ" but unfortunately this did not change anything.

Does anyone have an idea what could be the cause of the problem and how
it can be fixed ?

Thank you for your kind help.

Best regards
Andreas

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