Public bug reported:

Our Ubuntu clients are in an AD domain using realm. Accessing a samba share 
(SSO) with dolphin/nautilus (smb://HOST/share) is working on ubuntu clients 
where the host with the shared directory is ubuntu 16.04 or 17.10.
Accessing the shared folder on ubuntu 18.04 with same configuration as 16.04 or 
17.10 clients throws a panic on the system with 18.04:


/var/log/samba/log.LOCALHOST on HOST with 18.04
===============================================

[2018/04/06 13:43:50.360655,  5] ../source3/smbd/reply.c:780(reply_special)
  init msg_type=0x81 msg_flags=0x0
[2018/04/06 13:43:50.361179,  3] ../source3/smbd/process.c:1959(process_smb)
  Transaction 0 of length 194 (0 toread)
[2018/04/06 13:43:50.361241,  5] ../source3/lib/util.c:184(show_msg)
[2018/04/06 13:43:50.361264,  5] ../source3/lib/util.c:194(show_msg)
  size=190
  smb_com=0x72
  smb_rcls=0
  smb_reh=0
  smb_err=0
  smb_flg=24
  smb_flg2=51267
  smb_tid=0
  smb_pid=65534
  smb_uid=0
  smb_mid=0
  smt_wct=0
  smb_bcc=155
[2018/04/06 13:43:50.361467,  3] ../source3/smbd/process.c:1539(switch_message)
  switch message SMBnegprot (pid 2538) conn 0x0
[2018/04/06 13:43:50.361554,  4] 
../source3/smbd/sec_ctx.c:320(set_sec_ctx_internal)
  setting sec ctx (0, 0) - sec_ctx_stack_ndx = 0
[2018/04/06 13:43:50.361617,  5] 
../libcli/security/security_token.c:53(security_token_debug)
  Security token: (NULL)
[2018/04/06 13:43:50.361667,  5] 
../source3/auth/token_util.c:651(debug_unix_user_token)
  UNIX token of user 0
  Primary group is 0 and contains 0 supplementary groups
[2018/04/06 13:43:50.361766,  5] 
../source3/smbd/uid.c:425(smbd_change_to_root_user)
  change_to_root_user: now uid=(0,0) gid=(0,0)
[2018/04/06 13:43:50.363559,  3] ../source3/smbd/negprot.c:612(reply_negprot)
  Requested protocol [PC NETWORK PROGRAM 1.0]
[2018/04/06 13:43:50.363638,  3] ../source3/smbd/negprot.c:612(reply_negprot)
  Requested protocol [MICROSOFT NETWORKS 1.03]
[2018/04/06 13:43:50.363677,  3] ../source3/smbd/negprot.c:612(reply_negprot)
  Requested protocol [MICROSOFT NETWORKS 3.0]
[2018/04/06 13:43:50.363712,  3] ../source3/smbd/negprot.c:612(reply_negprot)
  Requested protocol [LANMAN1.0]
[2018/04/06 13:43:50.363747,  3] ../source3/smbd/negprot.c:612(reply_negprot)
  Requested protocol [LM1.2X002]
[2018/04/06 13:43:50.363782,  3] ../source3/smbd/negprot.c:612(reply_negprot)
  Requested protocol [DOS LANMAN2.1]
[2018/04/06 13:43:50.363817,  3] ../source3/smbd/negprot.c:612(reply_negprot)
  Requested protocol [LANMAN2.1]
[2018/04/06 13:43:50.363852,  3] ../source3/smbd/negprot.c:612(reply_negprot)
  Requested protocol [Samba]
[2018/04/06 13:43:50.363888,  3] ../source3/smbd/negprot.c:612(reply_negprot)
  Requested protocol [NT LANMAN 1.0]
[2018/04/06 13:43:50.363924,  3] ../source3/smbd/negprot.c:612(reply_negprot)
  Requested protocol [NT LM 0.12]
[2018/04/06 13:43:50.364019,  5] 
../lib/dbwrap/dbwrap.c:160(dbwrap_check_lock_order)
  check lock order 2 for /var/run/samba/serverid.tdb
[2018/04/06 13:43:50.364077,  5] 
../lib/dbwrap/dbwrap.c:128(dbwrap_lock_order_state_destructor)
  release lock order 2 for /var/run/samba/serverid.tdb
[2018/04/06 13:43:50.364259,  5] 
../source3/auth/auth.c:537(make_auth3_context_for_ntlm)
  Making default auth method list for server role = 'standalone server', 
encrypt passwords = yes
[2018/04/06 13:43:50.364282,  5] ../source3/auth/auth.c:48(smb_register_auth)
  Attempting to register auth backend trustdomain
[2018/04/06 13:43:50.364300,  5] ../source3/auth/auth.c:60(smb_register_auth)
  Successfully added auth method 'trustdomain'
[2018/04/06 13:43:50.364316,  5] ../source3/auth/auth.c:48(smb_register_auth)
  Attempting to register auth backend ntdomain
[2018/04/06 13:43:50.364334,  5] ../source3/auth/auth.c:60(smb_register_auth)
  Successfully added auth method 'ntdomain'
[2018/04/06 13:43:50.364352,  5] ../source3/auth/auth.c:48(smb_register_auth)
  Attempting to register auth backend guest
[2018/04/06 13:43:50.364364,  5] ../source3/auth/auth.c:60(smb_register_auth)
  Successfully added auth method 'guest'
[2018/04/06 13:43:50.364392,  5] ../source3/auth/auth.c:48(smb_register_auth)
  Attempting to register auth backend sam
[2018/04/06 13:43:50.364404,  5] ../source3/auth/auth.c:60(smb_register_auth)
  Successfully added auth method 'sam'
[2018/04/06 13:43:50.364415,  5] ../source3/auth/auth.c:48(smb_register_auth)
  Attempting to register auth backend sam_ignoredomain
[2018/04/06 13:43:50.364427,  5] ../source3/auth/auth.c:60(smb_register_auth)
  Successfully added auth method 'sam_ignoredomain'
[2018/04/06 13:43:50.364438,  5] ../source3/auth/auth.c:48(smb_register_auth)
  Attempting to register auth backend sam_netlogon3
[2018/04/06 13:43:50.364450,  5] ../source3/auth/auth.c:60(smb_register_auth)
  Successfully added auth method 'sam_netlogon3'
[2018/04/06 13:43:50.364461,  5] ../source3/auth/auth.c:48(smb_register_auth)
  Attempting to register auth backend winbind
[2018/04/06 13:43:50.364473,  5] ../source3/auth/auth.c:60(smb_register_auth)
  Successfully added auth method 'winbind'
[2018/04/06 13:43:50.364484,  5] ../source3/auth/auth.c:48(smb_register_auth)
  Attempting to register auth backend unix
[2018/04/06 13:43:50.364502,  5] ../source3/auth/auth.c:60(smb_register_auth)
  Successfully added auth method 'unix'
[2018/04/06 13:43:50.364514,  5] ../source3/auth/auth.c:400(load_auth_module)
  load_auth_module: Attempting to find an auth method to match guest
[2018/04/06 13:43:50.364527,  5] ../source3/auth/auth.c:425(load_auth_module)
  load_auth_module: auth method guest has a valid init
[2018/04/06 13:43:50.364539,  5] ../source3/auth/auth.c:400(load_auth_module)
  load_auth_module: Attempting to find an auth method to match sam_ignoredomain
[2018/04/06 13:43:50.364551,  5] ../source3/auth/auth.c:425(load_auth_module)
  load_auth_module: auth method sam_ignoredomain has a valid init
[2018/04/06 13:43:50.365880,  3] 
../auth/gensec/gensec_start.c:977(gensec_register)
  GENSEC backend 'gssapi_spnego' registered
[2018/04/06 13:43:50.365916,  3] 
../auth/gensec/gensec_start.c:977(gensec_register)
  GENSEC backend 'gssapi_krb5' registered
[2018/04/06 13:43:50.365930,  3] 
../auth/gensec/gensec_start.c:977(gensec_register)
  GENSEC backend 'gssapi_krb5_sasl' registered
[2018/04/06 13:43:50.365942,  3] 
../auth/gensec/gensec_start.c:977(gensec_register)
  GENSEC backend 'spnego' registered
[2018/04/06 13:43:50.365954,  3] 
../auth/gensec/gensec_start.c:977(gensec_register)
  GENSEC backend 'schannel' registered
[2018/04/06 13:43:50.365967,  3] 
../auth/gensec/gensec_start.c:977(gensec_register)
  GENSEC backend 'naclrpc_as_system' registered
[2018/04/06 13:43:50.365979,  3] 
../auth/gensec/gensec_start.c:977(gensec_register)
  GENSEC backend 'sasl-EXTERNAL' registered
[2018/04/06 13:43:50.365992,  3] 
../auth/gensec/gensec_start.c:977(gensec_register)
  GENSEC backend 'ntlmssp' registered
[2018/04/06 13:43:50.366004,  3] 
../auth/gensec/gensec_start.c:977(gensec_register)
  GENSEC backend 'ntlmssp_resume_ccache' registered
[2018/04/06 13:43:50.366017,  3] 
../auth/gensec/gensec_start.c:977(gensec_register)
  GENSEC backend 'http_basic' registered
[2018/04/06 13:43:50.366029,  3] 
../auth/gensec/gensec_start.c:977(gensec_register)
  GENSEC backend 'http_ntlm' registered
[2018/04/06 13:43:50.366042,  3] 
../auth/gensec/gensec_start.c:977(gensec_register)
  GENSEC backend 'krb5' registered
[2018/04/06 13:43:50.366055,  3] 
../auth/gensec/gensec_start.c:977(gensec_register)
  GENSEC backend 'fake_gssapi_krb5' registered
[2018/04/06 13:43:50.366109,  5] 
../auth/gensec/gensec_start.c:739(gensec_start_mech)
  Starting GENSEC mechanism spnego
[2018/04/06 13:43:50.366144,  5] 
../auth/gensec/gensec_start.c:739(gensec_start_mech)
  Starting GENSEC submechanism gse_krb5
[2018/04/06 13:43:50.366323,  0] ../lib/util/fault.c:78(fault_report)
  ===============================================================
[2018/04/06 13:43:50.366346,  0] ../lib/util/fault.c:79(fault_report)
  INTERNAL ERROR: Signal 11 in pid 2538 (4.7.6-Ubuntu)
  Please read the Trouble-Shooting section of the Samba HOWTO
[2018/04/06 13:43:50.366368,  0] ../lib/util/fault.c:81(fault_report)
  ===============================================================
[2018/04/06 13:43:50.366387,  0] ../source3/lib/util.c:815(smb_panic_s3)
  PANIC (pid 2538): internal error
[2018/04/06 13:43:50.366896,  0] ../source3/lib/util.c:926(log_stack_trace)
  BACKTRACE: 33 stack frames:
   #0 /usr/lib/x86_64-linux-gnu/libsmbconf.so.0(log_stack_trace+0x1f) 
[0x7f738c2bd9cf]
   #1 /usr/lib/x86_64-linux-gnu/libsmbconf.so.0(smb_panic_s3+0x20) 
[0x7f738c2bdaa0]
   #2 /usr/lib/x86_64-linux-gnu/libsamba-util.so.0(smb_panic+0x2f) 
[0x7f738e3a65af]
   #3 /usr/lib/x86_64-linux-gnu/libsamba-util.so.0(+0x197c6) [0x7f738e3a67c6]
   #4 /lib/x86_64-linux-gnu/libpthread.so.0(+0x12890) [0x7f738e817890]
   #5 /usr/lib/x86_64-linux-gnu/samba/libgse.so.0(+0x8070) [0x7f73866c5070]
   #6 
/usr/lib/x86_64-linux-gnu/samba/libgse.so.0(gse_krb5_get_server_keytab+0x95) 
[0x7f73866c5ac5]
   #7 /usr/lib/x86_64-linux-gnu/samba/libgse.so.0(+0xac89) [0x7f73866c7c89]
   #8 /usr/lib/x86_64-linux-gnu/samba/libgensec.so.0(+0x187a5) [0x7f73864ab7a5]
   #9 /usr/lib/x86_64-linux-gnu/samba/libgensec.so.0(+0xa2a7) [0x7f738649d2a7]
   #10 /usr/lib/x86_64-linux-gnu/samba/libgensec.so.0(+0xb7fe) [0x7f738649e7fe]
   #11 /usr/lib/x86_64-linux-gnu/samba/libgensec.so.0(gensec_update_ev+0x64) 
[0x7f73864aafa4]
   #12 /usr/lib/x86_64-linux-gnu/samba/libsmbd-base.so.0(negprot_spnego+0xa8) 
[0x7f738df764f8]
   #13 /usr/lib/x86_64-linux-gnu/samba/libsmbd-base.so.0(+0x12ba3b) 
[0x7f738df76a3b]
   #14 /usr/lib/x86_64-linux-gnu/samba/libsmbd-base.so.0(reply_negprot+0x4e3) 
[0x7f738df771f3]
   #15 /usr/lib/x86_64-linux-gnu/samba/libsmbd-base.so.0(+0x1814ca) 
[0x7f738dfcc4ca]
   #16 /usr/lib/x86_64-linux-gnu/samba/libsmbd-base.so.0(+0x183aee) 
[0x7f738dfceaee]
   #17 /usr/lib/x86_64-linux-gnu/samba/libsmbd-base.so.0(+0x1849fc) 
[0x7f738dfcf9fc]
   #18 /usr/lib/x86_64-linux-gnu/libtevent.so.0(+0x9ed0) [0x7f738aeefed0]
   #19 /usr/lib/x86_64-linux-gnu/libtevent.so.0(+0x8357) [0x7f738aeee357]
   #20 /usr/lib/x86_64-linux-gnu/libtevent.so.0(_tevent_loop_once+0x9d) 
[0x7f738aeea7cd]
   #21 /usr/lib/x86_64-linux-gnu/libtevent.so.0(tevent_common_loop_wait+0x1b) 
[0x7f738aeea9eb]
   #22 /usr/lib/x86_64-linux-gnu/libtevent.so.0(+0x82f7) [0x7f738aeee2f7]
   #23 /usr/lib/x86_64-linux-gnu/samba/libsmbd-base.so.0(smbd_process+0x718) 
[0x7f738dfd0d78]
   #24 /usr/sbin/smbd(+0xcfcc) [0x55a15e207fcc]
   #25 /usr/lib/x86_64-linux-gnu/libtevent.so.0(+0x9ed0) [0x7f738aeefed0]
   #26 /usr/lib/x86_64-linux-gnu/libtevent.so.0(+0x8357) [0x7f738aeee357]
   #27 /usr/lib/x86_64-linux-gnu/libtevent.so.0(_tevent_loop_once+0x9d) 
[0x7f738aeea7cd]
   #28 /usr/lib/x86_64-linux-gnu/libtevent.so.0(tevent_common_loop_wait+0x1b) 
[0x7f738aeea9eb]
   #29 /usr/lib/x86_64-linux-gnu/libtevent.so.0(+0x82f7) [0x7f738aeee2f7]
   #30 /usr/sbin/smbd(main+0x1d0a) [0x55a15e20334a]
   #31 /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xe7) [0x7f738ab16b97]
   #32 /usr/sbin/smbd(_start+0x2a) [0x55a15e20345a]
[2018/04/06 13:43:50.367078,  0] ../source3/lib/util.c:827(smb_panic_s3)
  smb_panic(): calling panic action [/usr/share/samba/panic-action 2538]
30      ../sysdeps/unix/sysv/linux/waitpid.c: No such file or directory.
mail: cannot send message: Process exited with a non-zero status
[2018/04/06 13:43:51.587520,  0] ../source3/lib/util.c:835(smb_panic_s3)
  smb_panic(): action returned status 36
[2018/04/06 13:43:51.587618,  0] ../source3/lib/dumpcore.c:318(dump_core)
  coredump is handled by helper binary specified at 
/proc/sys/kernel/core_pattern[2018/04/06 13:43:52.153171,  5]


client
======

HOST:   Ubuntu 18.04RC (2018-04-06), amd64
samba:  4.7.6+dfsg~ubuntu-0ubuntu1
krb5:   1.16-2build1
sssd:   1.16.0-5ubuntu2


This is a blocker for us to upgrade from 16.04 to 18.04 after release. :-(

** Affects: samba (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1761737

Title:
  samba PANIC, INTERNAL ERROR: Signal 11

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