SBT:

The Samba 'panic action' script, /usr/share/samba/scripts/panic-action,
was called for pid 5905 (/usr/sbin/winbindd).

Below is a backtrace for this process generated with gdb, which shows
the state of the program at the time the error occured.  You are
encouraged to submit this information as a bug report to the Samba Team.
via https://bugzilla.samba.org
For information about the procedure for submitting bug reports, please see
https://wiki.samba.org/index.php/Bug_Reporting
If you think this is a Sernet-Samba-Package bug or if you want commercial
Samba support please send a mail to samba@sernet.de.

[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib64/libthread_db.so.1".
0x00007fca6459f4fc in waitpid () from /lib64/libc.so.6
#0  0x00007fca6459f4fc in waitpid () from /lib64/libc.so.6
No symbol table info available.
#1  0x00007fca6451cf62 in do_system () from /lib64/libc.so.6
No symbol table info available.
#2  0x00007fca67049414 in smb_panic_s3 (why=<optimized out>) at ../../source3/lib/util.c:840
        lp_sub = <optimized out>
        cmd = 0x559a5dab1520 "/usr/share/samba/scripts/panic-action 5905"
        result = <optimized out>
        __FUNCTION__ = "smb_panic_s3"
#3  0x00007fca69bae921 in smb_panic (why=why@entry=0x7fff907e79d0 "Signal 11: Segmentation fault") at ../../lib/util/fault.c:197
No locals.
#4  0x00007fca69bae9aa in fault_report (sig=<optimized out>) at ../../lib/util/fault.c:81
        signal_string = "Signal 11: Segmentation fault\000\062\066\066\060\064\060\066\060\062-2346345224-122503247-501]\000\000\000\377\177\000\000lpUd\312\177\000\000\002", '\000' <repeats 23 times>, "\253\215\356g\312\177\000\000`\200~\220\377\177\000\000\200\340\211d\312\177\000"
        counter = 1
#5  sig_fault (sig=11) at ../../lib/util/fault.c:92
No locals.
#6  <signal handler called>
No symbol table info available.
#7  dcerpc_binding_handle_call_send (mem_ctx=<optimized out>, ev=ev@entry=0x559a5da7bb30, h=h@entry=0x0, object=object@entry=0x0, table=0x7fca69771620 <ndr_table_winbind>, opnum=opnum@entry=8, r_mem=0x559a5da9ab20, r_ptr=r_ptr@entry=0x559a5daac9f8) at ../../librpc/rpc/binding_handle.c:376
        req = 0x559a5daae570
        state = 0x559a5daae720
        subreq = <optimized out>
        ndr_err = <optimized out>
#8  0x00007fca6a9d28b4 in dcerpc_wbint_GetNssInfo_r_send (mem_ctx=<optimized out>, ev=ev@entry=0x559a5da7bb30, h=h@entry=0x0, r=0x559a5daac9f8) at librpc/gen_ndr/ndr_winbind_c.c:1856
        req = 0x559a5daae240
        state = 0x559a5daae3f0
        subreq = <optimized out>
#9  0x00007fca6a9d2b7a in dcerpc_wbint_GetNssInfo_send (mem_ctx=mem_ctx@entry=0x559a5daa9fe0, ev=0x559a5da7bb30, h=0x0, _info=_info@entry=0x559a5daaa150) at librpc/gen_ndr/ndr_winbind_c.c:1954
        req = 0x559a5daac830
        state = 0x559a5daac9e0
        subreq = <optimized out>
#10 0x0000559a5be7ff34 in wb_queryuser_got_domain (subreq=<optimized out>) at ../../source3/winbindd/wb_queryuser.c:199
        req = 0x559a5daa9e30
        state = 0x559a5daa9fe0
        info = 0x559a5daaa150
        type = SID_NAME_USER
        child_binding_handle = <optimized out>
        status = {v = 0}
#11 0x00007fca6c7d1cd5 in _tevent_req_notify_callback (req=req@entry=0x559a5daaba80, location=location@entry=0x559a5becb820 "../../source3/winbindd/wb_lookupsid.c:83") at ../../lib/tevent/tevent_req.c:141
No locals.
#12 0x00007fca6c7d1d6e in tevent_req_finish (req=req@entry=0x559a5daaba80, state=state@entry=TEVENT_REQ_DONE, location=location@entry=0x559a5becb820 "../../source3/winbindd/wb_lookupsid.c:83") at ../../lib/tevent/tevent_req.c:193
        p = 0x559a5daabd00
#13 0x00007fca6c7d1d8a in _tevent_req_done (req=req@entry=0x559a5daaba80, location=location@entry=0x559a5becb820 "../../source3/winbindd/wb_lookupsid.c:83") at ../../lib/tevent/tevent_req.c:199
No locals.
#14 0x0000559a5be7c21d in wb_lookupsid_done (subreq=<optimized out>) at ../../source3/winbindd/wb_lookupsid.c:83
        req = 0x559a5daaba80
        state = <optimized out>
        status = {v = 0}
        result = {v = 0}
#15 0x00007fca6c7d1cd5 in _tevent_req_notify_callback (req=req@entry=0x559a5daabe10, location=location@entry=0x7fca6a9d8f18 "librpc/gen_ndr/ndr_winbind_c.c:386") at ../../lib/tevent/tevent_req.c:141
No locals.
#16 0x00007fca6c7d1d6e in tevent_req_finish (req=req@entry=0x559a5daabe10, state=state@entry=TEVENT_REQ_DONE, location=location@entry=0x7fca6a9d8f18 "librpc/gen_ndr/ndr_winbind_c.c:386") at ../../lib/tevent/tevent_req.c:193
        p = 0x559a5daac080
#17 0x00007fca6c7d1d8a in _tevent_req_done (req=req@entry=0x559a5daabe10, location=location@entry=0x7fca6a9d8f18 "librpc/gen_ndr/ndr_winbind_c.c:386") at ../../lib/tevent/tevent_req.c:199
No locals.
#18 0x00007fca6a9d02cb in dcerpc_wbint_LookupSid_done (subreq=<optimized out>) at librpc/gen_ndr/ndr_winbind_c.c:386
        req = 0x559a5daabe10
        state = 0x559a5daabfc0
        status = {v = 0}
        mem_ctx = <optimized out>
#19 0x00007fca6c7d1cd5 in _tevent_req_notify_callback (req=req@entry=0x559a5daac190, location=location@entry=0x7fca6a9d7bd8 "librpc/gen_ndr/ndr_winbind_c.c:267") at ../../lib/tevent/tevent_req.c:141
No locals.
#20 0x00007fca6c7d1d6e in tevent_req_finish (req=req@entry=0x559a5daac190, state=state@entry=TEVENT_REQ_DONE, location=location@entry=0x7fca6a9d7bd8 "librpc/gen_ndr/ndr_winbind_c.c:267") at ../../lib/tevent/tevent_req.c:193
        p = 0x559a5daac3b0
#21 0x00007fca6c7d1d8a in _tevent_req_done (req=req@entry=0x559a5daac190, location=location@entry=0x7fca6a9d7bd8 "librpc/gen_ndr/ndr_winbind_c.c:267") at ../../lib/tevent/tevent_req.c:199
No locals.
#22 0x00007fca6a9cf19c in dcerpc_wbint_LookupSid_r_done (subreq=<optimized out>) at librpc/gen_ndr/ndr_winbind_c.c:267
        req = 0x559a5daac190
        status = {v = 0}
#23 0x00007fca6c7d1cd5 in _tevent_req_notify_callback (req=req@entry=0x559a5daac4c0, location=location@entry=0x7fca6c9f7dc8 "../../librpc/rpc/binding_handle.c:520") at ../../lib/tevent/tevent_req.c:141
No locals.
#24 0x00007fca6c7d1d6e in tevent_req_finish (req=req@entry=0x559a5daac4c0, state=state@entry=TEVENT_REQ_DONE, location=location@entry=0x7fca6c9f7dc8 "../../librpc/rpc/binding_handle.c:520") at ../../lib/tevent/tevent_req.c:193
        p = 0x559a5daac720
#25 0x00007fca6c7d1d8a in _tevent_req_done (req=req@entry=0x559a5daac4c0, location=location@entry=0x7fca6c9f7dc8 "../../librpc/rpc/binding_handle.c:520") at ../../lib/tevent/tevent_req.c:199
No locals.
#26 0x00007fca6c9ec0b6 in dcerpc_binding_handle_call_done (subreq=<optimized out>) at ../../librpc/rpc/binding_handle.c:520
        req = 0x559a5daac4c0
        state = 0x559a5daac670
        h = 0x559a5da93b20
        error = {v = 0}
        out_flags = 0
        ndr_err = <optimized out>
#27 0x00007fca6c7d1cd5 in _tevent_req_notify_callback (req=req@entry=0x559a5daacca0, location=location@entry=0x7fca6c9f7a78 "../../librpc/rpc/binding_handle.c:203") at ../../lib/tevent/tevent_req.c:141
No locals.
#28 0x00007fca6c7d1d6e in tevent_req_finish (req=req@entry=0x559a5daacca0, state=state@entry=TEVENT_REQ_DONE, location=location@entry=0x7fca6c9f7a78 "../../librpc/rpc/binding_handle.c:203") at ../../lib/tevent/tevent_req.c:193
        p = 0x559a5daaced0
#29 0x00007fca6c7d1d8a in _tevent_req_done (req=req@entry=0x559a5daacca0, location=location@entry=0x7fca6c9f7a78 "../../librpc/rpc/binding_handle.c:203") at ../../lib/tevent/tevent_req.c:199
No locals.
#30 0x00007fca6c9ebb2d in dcerpc_binding_handle_raw_call_done (subreq=<optimized out>) at ../../librpc/rpc/binding_handle.c:203
        req = 0x559a5daacca0
        state = <optimized out>
        error = {v = 0}
#31 0x00007fca6c7d1cd5 in _tevent_req_notify_callback (req=req@entry=0x559a5daacfe0, location=location@entry=0x559a5bec4640 "../../source3/winbindd/winbindd_dual_ndr.c:208") at ../../lib/tevent/tevent_req.c:141
No locals.
#32 0x00007fca6c7d1d6e in tevent_req_finish (req=req@entry=0x559a5daacfe0, state=state@entry=TEVENT_REQ_DONE, location=location@entry=0x559a5bec4640 "../../source3/winbindd/winbindd_dual_ndr.c:208") at ../../lib/tevent/tevent_req.c:193
        p = 0x559a5daada80
#33 0x00007fca6c7d1d8a in _tevent_req_done (req=req@entry=0x559a5daacfe0, location=location@entry=0x559a5bec4640 "../../source3/winbindd/winbindd_dual_ndr.c:208") at ../../lib/tevent/tevent_req.c:199
No locals.
#34 0x0000559a5be70cbb in wbint_bh_raw_call_domain_done (subreq=<optimized out>) at ../../source3/winbindd/winbindd_dual_ndr.c:208
        req = 0x559a5daacfe0
        state = 0x559a5daad190
        ret = 0
        err = 32714
#35 0x00007fca6c7d1cd5 in _tevent_req_notify_callback (req=req@entry=0x559a5daadb90, location=location@entry=0x559a5bec2a28 "../../source3/winbindd/winbindd_dual.c:736") at ../../lib/tevent/tevent_req.c:141
No locals.
#36 0x00007fca6c7d1d6e in tevent_req_finish (req=req@entry=0x559a5daadb90, state=state@entry=TEVENT_REQ_DONE, location=location@entry=0x559a5bec2a28 "../../source3/winbindd/winbindd_dual.c:736") at ../../lib/tevent/tevent_req.c:193
        p = 0x559a5daadde0
#37 0x00007fca6c7d1d8a in _tevent_req_done (req=req@entry=0x559a5daadb90, location=location@entry=0x559a5bec2a28 "../../source3/winbindd/winbindd_dual.c:736") at ../../lib/tevent/tevent_req.c:199
No locals.
#38 0x0000559a5be6e82f in wb_domain_request_done (subreq=<optimized out>) at ../../source3/winbindd/winbindd_dual.c:736
        req = 0x559a5daadb90
        state = <optimized out>
        ret = 0
        err = 0
#39 0x00007fca6c7d1cd5 in _tevent_req_notify_callback (req=req@entry=0x559a5daadef0, location=location@entry=0x559a5bec1418 "../../source3/winbindd/winbindd_dual.c:300") at ../../lib/tevent/tevent_req.c:141
No locals.
#40 0x00007fca6c7d1d6e in tevent_req_finish (req=req@entry=0x559a5daadef0, state=state@entry=TEVENT_REQ_DONE, location=location@entry=0x559a5bec1418 "../../source3/winbindd/winbindd_dual.c:300") at ../../lib/tevent/tevent_req.c:193
        p = 0x559a5daae130
#41 0x00007fca6c7d1d8a in _tevent_req_done (req=req@entry=0x559a5daadef0, location=location@entry=0x559a5bec1418 "../../source3/winbindd/winbindd_dual.c:300") at ../../lib/tevent/tevent_req.c:199
No locals.
#42 0x0000559a5be6cb17 in wb_child_request_done (subreq=0x559a5daaee20) at ../../source3/winbindd/winbindd_dual.c:300
        req = 0x559a5daadef0
        state = <optimized out>
        ret = <optimized out>
        err = 0
#43 0x00007fca6c7d1cd5 in _tevent_req_notify_callback (req=req@entry=0x559a5daaee20, location=location@entry=0x7fca6530dd88 "../../nsswitch/wb_reqtrans.c:432") at ../../lib/tevent/tevent_req.c:141
No locals.
#44 0x00007fca6c7d1d6e in tevent_req_finish (req=req@entry=0x559a5daaee20, state=state@entry=TEVENT_REQ_DONE, location=location@entry=0x7fca6530dd88 "../../nsswitch/wb_reqtrans.c:432") at ../../lib/tevent/tevent_req.c:193
        p = 0x559a5daaf050
#45 0x00007fca6c7d1d8a in _tevent_req_done (req=req@entry=0x559a5daaee20, location=location@entry=0x7fca6530dd88 "../../nsswitch/wb_reqtrans.c:432") at ../../lib/tevent/tevent_req.c:199
No locals.
#46 0x00007fca6530d233 in wb_simple_trans_read_done (subreq=<optimized out>) at ../../nsswitch/wb_reqtrans.c:432
        req = 0x559a5daaee20
        state = <optimized out>
        ret = 4068
        err = 0
#47 0x00007fca6c7d1cd5 in _tevent_req_notify_callback (req=req@entry=0x559a5daaf810, location=location@entry=0x7fca6530d910 "../../nsswitch/wb_reqtrans.c:275") at ../../lib/tevent/tevent_req.c:141
No locals.
#48 0x00007fca6c7d1d6e in tevent_req_finish (req=req@entry=0x559a5daaf810, state=state@entry=TEVENT_REQ_DONE, location=location@entry=0x7fca6530d910 "../../nsswitch/wb_reqtrans.c:275") at ../../lib/tevent/tevent_req.c:193
        p = 0x559a5daafa30
#49 0x00007fca6c7d1d8a in _tevent_req_done (req=req@entry=0x559a5daaf810, location=location@entry=0x7fca6530d910 "../../nsswitch/wb_reqtrans.c:275") at ../../lib/tevent/tevent_req.c:199
No locals.
#50 0x00007fca6530cb37 in wb_resp_read_done (subreq=<optimized out>) at ../../nsswitch/wb_reqtrans.c:275
        req = 0x559a5daaf810
        state = 0x559a5daaf9c0
        buf = 0x559a5daafe70 "N\003\253]\232U"
        err = 0
#51 0x00007fca6c7d1cd5 in _tevent_req_notify_callback (req=req@entry=0x559a5daafb40, location=location@entry=0x7fca5eed63a0 "../../lib/async_req/async_sock.c:567") at ../../lib/tevent/tevent_req.c:141
No locals.
#52 0x00007fca6c7d1d6e in tevent_req_finish (req=req@entry=0x559a5daafb40, state=state@entry=TEVENT_REQ_DONE, location=location@entry=0x7fca5eed63a0 "../../lib/async_req/async_sock.c:567") at ../../lib/tevent/tevent_req.c:193
        p = 0x559a5daafd80
#53 0x00007fca6c7d1d8a in _tevent_req_done (req=req@entry=0x559a5daafb40, location=location@entry=0x7fca5eed63a0 "../../lib/async_req/async_sock.c:567") at ../../lib/tevent/tevent_req.c:199
No locals.
#54 0x00007fca5eed4f79 in read_packet_handler (ev=<optimized out>, fde=<optimized out>, flags=<optimized out>, private_data=<optimized out>) at ../../lib/async_req/async_sock.c:567
        req = 0x559a5daafb40
        state = 0x559a5daafcf0
        total = 4068
        nread = <optimized out>
        more = <optimized out>
        tmp = <optimized out>
#55 0x00007fca6c7d111c in tevent_common_invoke_fd_handler (fde=0x559a5daa9740, flags=<optimized out>, removed=removed@entry=0x0) at ../../lib/tevent/tevent_fd.c:138
        handler_ev = 0x559a5da7bb30
#56 0x00007fca6c7d74a5 in epoll_event_loop (tvalp=0x7fff907e8ea0, epoll_ev=0x559a5da7bd00) at ../../lib/tevent/tevent_epoll.c:736
        fde = <optimized out>
        flags = <optimized out>
        mpx_fde = <optimized out>
        ret = <optimized out>
        i = 0
        timeout = <optimized out>
        wait_errno = 17
        events = {{events = 1, data = {ptr = 0x559a5daa9740, fd = 1571460928, u32 = 1571460928, u64 = 94121484785472}}}
#57 epoll_event_loop_once (ev=<optimized out>, location=<optimized out>) at ../../lib/tevent/tevent_epoll.c:937
        epoll_ev = 0x559a5da7bd00
        tval = {tv_sec = 4, tv_usec = 885563}
        panic_triggered = false
#58 0x00007fca6c7d5217 in std_event_loop_once (ev=0x559a5da7bb30, location=0x559a5be99a70 "../../source3/winbindd/winbindd.c:2026") at ../../lib/tevent/tevent_standard.c:110
        glue_ptr = <optimized out>
        glue = 0x559a5da7bc70
        ret = <optimized out>
#59 0x00007fca6c7d0946 in _tevent_loop_once (ev=0x559a5da7bb30, location=location@entry=0x559a5be99a70 "../../source3/winbindd/winbindd.c:2026") at ../../lib/tevent/tevent.c:772
        ret = <optimized out>
        nesting_stack_ptr = 0x0
#60 0x0000559a5be20cb7 in main (argc=<optimized out>, argv=<optimized out>) at ../../source3/winbindd/winbindd.c:2026
        is_daemon = false
        Fork = false
        log_stdout = false
        no_process_group = true
        long_options = {{longName = 0x0, shortName = 0 '\000', argInfo = 4, arg = 0x7fca65d6a160 <poptHelpOptions>, val = 0, descrip = 0x559a5be971bb "Help options:", argDescrip = 0x0}, {longName = 0x559a5be971d0 "stdout", shortName = 83 'S', argInfo = 0, arg = 0x0, val = 1003, descrip = 0x559a5be971c9 "Log to stdout", argDescrip = 0x0}, {longName = 0x559a5be971d7 "foreground", shortName = 70 'F', argInfo = 0, arg = 0x0, val = 1001, descrip = 0x559a5be971e2 "Daemon in foreground mode", argDescrip = 0x0}, {longName = 0x559a5be971fc "no-process-group", shortName = 0 '\000', argInfo = 0, arg = 0x0, val = 1002, descrip = 0x559a5be98d00 "Don't create a new process group", argDescrip = 0x0}, {longName = 0x559a5bed9ee9 "daemon", shortName = 68 'D', argInfo = 0, arg = 0x0, val = 1000, descrip = 0x559a5be9720d "Become a daemon (default)", argDescrip = 0x0}, {longName = 0x559a5be97227 "interactive", shortName = 105 'i', argInfo = 0, arg = 0x0, val = 105, descrip = 0x559a5be97233 "Interactive mode", argDescrip = 0x0}, {longName = 0x559a5be97244 "no-caching", shortName = 110 'n', argInfo = 0, arg = 0x0, val = 110, descrip = 0x559a5be9724f "Disable caching", argDescrip = 0x0}, {longName = 0x0, shortName = 0 '\000', argInfo = 4, arg = 0x7fca6a3a2280 <popt_common_samba>, val = 0, descrip = 0x559a5be9725f "Common samba options:", argDescrip = 0x0}, {longName = 0x0, shortName = 0 '\000', argInfo = 0, arg = 0x0, val = 0, descrip = 0x0, argDescrip = 0x0}}
        lp_sub = <optimized out>
        pc = <optimized out>
        opt = <optimized out>
        frame = 0x559a5da8d6d0
        status = <optimized out>
        ok = <optimized out>
        ep_server = <optimized out>
        dce_ctx = <optimized out>
        __FUNCTION__ = "main"
        __func__ = "main"

The problem is in wb_queryuser_got_domain() we call idmap_child_handle() assuming it is already initialized via wb_sids2xids_send() -> wb_parent_idmap_setup_send().

Unfortunately in wb_sids2xids_send() we skip the call to wb_parent_idmap_setup_send() if all sids are in the cache...

Working on a fix, need bugnumber...