[Samba] Samba panic when accessing DNS domain entry with RSAT DNS tool

Andreas Oster aoster at novanetwork.de
Fri Nov 9 10:15:49 UTC 2018 

Hi everybody,

for some time now I have an issue with our samba/bind9-DLZ setup which 
became worse lately.
I use the RSAT DNS tool to configure DNS records. In the past it 
sometimes happened, that DNS died when accessing the domain zone. This 
condition could only be resolved by restarting samba on the affected DC.
Unfortunately the situation got worse and configuration/modification of 
entries in the domain zone is nearly impossible.

Connecting to the DNS is working but when I do select the domain zone I 
get the following in the log.samba log file:

<--

[2018/11/09 11:08:18.452913,  0] 
../source4/rpc_server/dnsserver/dcerpc_dnsserver.c:1089(dnsserver_query_zone)
   dnsserver: Invalid zone operation IsSigneddnsserver: Invalid zone 
operation IsSigneddnsserver: Invalid zone operation IsSigneddnsserver: 
Invalid zone operation IsSigneddnsserver: Invalid zone operation 
IsSigneddnsserver: Invalid zone operation IsSigneddnsserver: Invalid 
zone operation 
IsSigned===============================================================
[2018/11/09 11:08:23.956220,  0] ../lib/util/fault.c:80(fault_report)
   INTERNAL ERROR: Signal 11 in pid 3901 (4.9.3-GIT-424d4d2b408)
   Please read the Trouble-Shooting section of the Samba HOWTO
[2018/11/09 11:08:23.956548,  0] ../lib/util/fault.c:82(fault_report)
   ===============================================================
[2018/11/09 11:08:23.956634,  0] ../lib/util/fault.c:128(smb_panic_default)
   smb_panic_default: PANIC (pid 3901): internal error
[2018/11/09 11:08:23.957585,  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) 
[0x7f2472c76562]
    #1 /usr/local/samba/lib/libsamba-util.so.0(+0x202e2) [0x7f2472c762e2]
    #2 /usr/local/samba/lib/libsamba-util.so.0(log_stack_trace+0) 
[0x7f2472c76534]
    #3 /usr/local/samba/lib/libsamba-util.so.0(+0x201e2) [0x7f2472c761e2]
    #4 /usr/local/samba/lib/libsamba-util.so.0(+0x201f7) [0x7f2472c761f7]
    #5 /lib/x86_64-linux-gnu/libpthread.so.0(+0x12890) [0x7f2472eea890]
    #6 
/usr/local/samba/lib/private/libldb.so.1(ldb_msg_find_element+0x5e) 
[0x7f2472a2ac88]
    #7 
/usr/local/samba/lib/private/libldb.so.1(ldb_msg_find_ldb_val+0x23) 
[0x7f2472a2bd6a]
    #8 
/usr/local/samba/lib/private/libldb.so.1(ldb_msg_find_attr_as_string+0x27) 
[0x7f2472a2c41c]
    #9 /usr/local/samba/lib/libdcerpc-server.so.0(dns_name_compare+0x4e) 
[0x7f245b39eae2]
    #10 /usr/local/samba/lib/private/libldb.so.1(ldb_qsort+0x723) 
[0x7f2472a3ba6d]
    #11 /usr/local/samba/lib/libdcerpc-server.so.0(+0x65483) 
[0x7f245b398483]
    #12 /usr/local/samba/lib/libdcerpc-server.so.0(+0x66844) 
[0x7f245b399844]
    #13 /usr/local/samba/lib/libdcerpc-server.so.0(+0x6722c) 
[0x7f245b39a22c]
    #14 /usr/local/samba/lib/libdcerpc-server.so.0(+0x2c371) 
[0x7f245b35f371]
    #15 /usr/local/samba/lib/libdcerpc-server.so.0(+0x2cdea) 
[0x7f245b35fdea]
    #16 /usr/local/samba/lib/libdcerpc-server.so.0(+0x2e808) 
[0x7f245b361808]
    #17 
/usr/local/samba/lib/private/libtevent.so.0(_tevent_req_notify_callback+0x6a) 
[0x7f24723d46a2]
    #18 /usr/local/samba/lib/private/libtevent.so.0(+0x8803) 
[0x7f24723d4803]
    #19 
/usr/local/samba/lib/private/libtevent.so.0(_tevent_req_done+0x25) 
[0x7f24723d4830]
    #20 /usr/local/samba/lib/libdcerpc-binding.so.0(+0x1e1f6) 
[0x7f246d20c1f6]
    #21 
/usr/local/samba/lib/private/libtevent.so.0(_tevent_req_notify_callback+0x6a) 
[0x7f24723d46a2]
    #22 /usr/local/samba/lib/private/libtevent.so.0(+0x8803) 
[0x7f24723d4803]
    #23 
/usr/local/samba/lib/private/libtevent.so.0(_tevent_req_done+0x25) 
[0x7f24723d4830]
    #24 /usr/local/samba/lib/private/libsamba-sockets-samba4.so(+0xd962) 
[0x7f246d425962]
    #25 /usr/local/samba/lib/private/libsamba-sockets-samba4.so(+0xdb9c) 
[0x7f246d425b9c]
    #26 
/usr/local/samba/lib/private/libtevent.so.0(_tevent_req_notify_callback+0x6a) 
[0x7f24723d46a2]
    #27 /usr/local/samba/lib/private/libtevent.so.0(+0x8803) 
[0x7f24723d4803]
    #28 
/usr/local/samba/lib/private/libtevent.so.0(_tevent_req_done+0x25) 
[0x7f24723d4830]
    #29 /usr/local/samba/lib/private/libsamba-sockets-samba4.so(+0xcda2) 
[0x7f246d424da2]
    #30 
/usr/local/samba/lib/private/libtevent.so.0(_tevent_req_notify_callback+0x6a) 
[0x7f24723d46a2]
    #31 /usr/local/samba/lib/private/libtevent.so.0(+0x8803) 
[0x7f24723d4803]
    #32 /usr/local/samba/lib/private/libtevent.so.0(+0x8930) 
[0x7f24723d4930]
    #33 
/usr/local/samba/lib/private/libtevent.so.0(tevent_common_invoke_immediate_handler+0x184) 
[0x7f24723d35a5]
    #34 
/usr/local/samba/lib/private/libtevent.so.0(tevent_common_loop_immediate+0x37) 
[0x7f24723d36ab]
    #35 /usr/local/samba/lib/private/libtevent.so.0(+0x11d33) 
[0x7f24723ddd33]
    #36 /usr/local/samba/lib/private/libtevent.so.0(+0xe5d9) 
[0x7f24723da5d9]
    #37 
/usr/local/samba/lib/private/libtevent.so.0(_tevent_loop_once+0x11e) 
[0x7f24723d204f]
    #38 
/usr/local/samba/lib/private/libtevent.so.0(tevent_common_loop_wait+0x25) 
[0x7f24723d23a1]
    #39 /usr/local/samba/lib/private/libtevent.so.0(+0xe67b) 
[0x7f24723da67b]
    #40 
/usr/local/samba/lib/private/libtevent.so.0(_tevent_loop_wait+0x2b) 
[0x7f24723d2444]
    #41 /usr/local/samba/lib/process_model/standard.so(+0x27e9) 
[0x7f2464bfd7e9]
    #42 
/usr/local/samba/lib/private/libservice-samba4.so(task_server_startup+0x9b) 
[0x7f2471fafaf5]
    #43 /usr/local/samba/lib/private/libservice-samba4.so(+0x2afe) 
[0x7f2471fadafe]
    #44 
/usr/local/samba/lib/private/libservice-samba4.so(server_service_startup+0x166) 
[0x7f2471fadc83]
    #45 samba: task[dcesrv](+0x5ca6) [0x557afdceaca6]
    #46 samba: task[dcesrv](main+0x3f) [0x557afdceadb8]
    #47 /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xe7) 
[0x7f246fec9b97]
    #48 samba: task[dcesrv](_start+0x2a) [0x557afdce88ca]
[2018/11/09 11:08:24.463400,  0] 
../source4/smbd/process_standard.c:158(standard_child_pipe_handler)
   standard_child_pipe_handler: Child 3901 (rpc) terminated with signal 6
-->

Afterwards DNS is not working and samba needs to be restarted.
I have configured some additional zones which do not result in the same 
error when being accessed via the RSAT DNS tool.

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

Thank you very much for your kind support.

Best regards
Andreas

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