samba - Sep 2019 - DNS crashing when accessing with MS DNS tool on Samba with BIND9 backend

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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I would suggest, downgrade to a "release" samba version. 
Check if it happens again.. 

4.10.9-GIT-e3f51924971 < 4.10.9 is not released yet. 
If is also craches with 4.10.8, then submit a bug in bugzilla. 
(note: > ? Please read the Trouble-Shooting section of the Samba HOWTO ) 
;-) 

Greetz, 

Louis

> -----Oorspronkelijk bericht-----
> Van: samba [mailto:samba-bounces at lists.samba.org] Namens 
> Andreas Oster via samba
> Verzonden: vrijdag 20 september 2019 13:13
> Aan: samba at lists.samba.org
> Onderwerp: [Samba] DNS crashing when accessing with MS DNS 
> tool on Samba with BIND9 backend
> 
> 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(dns
> server_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_invo
> ke_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_servi
> ce_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
> 
> -- 
> To unsubscribe from this list go to the following URL and read the
> instructions:  https://lists.samba.org/mailman/options/samba
>

On 20/09/2019 12:43, L.P.H. van Belle via samba wrote:
> I would suggest, downgrade to a "release" samba version.
> Check if it happens again..
>
> 4.10.9-GIT-e3f51924971 < 4.10.9 is not released yet.
> If is also craches with 4.10.8, then submit a bug in bugzilla.
> (note: > ? Please read the Trouble-Shooting section of the Samba HOWTO )
> ;-)
>
I agree with what Louis says, plus it might help if you tell us what OS 
this is on and post your Bind9 conf files.

Rowland