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Bug 43088 - UCS@school exam user: smbd core due to panic /SIGABRT "smbXsrv_session_logoff_all failed"
UCS@school exam user: smbd core due to panic /SIGABRT "smbXsrv_session_logoff...
Status: CLOSED WONTFIX
Product: UCS@school
Classification: Unclassified
Component: Samba 4
UCS@school 4.1 R2
Other Linux
: P5 normal (vote)
: UCS@school 4.2 vXXX
Assigned To: Samba maintainers
:
Depends on:
Blocks: 44157
  Show dependency tree / graph
 
Reported: 2016-12-01 12:30 CET by Florian Best
Modified: 2023-06-12 15:39 CEST (History)
4 users (show)

See Also:
What kind of report is it?: Bug Report
What type of bug is this?: 5: Major Usability: Impairs usability in key scenarios
Who will be affected by this bug?: 2: Will only affect a few installed domains
How will those affected feel about the bug?: 2: A Pain – users won’t like this once they notice it
User Pain: 0.114
Enterprise Customer affected?:
School Customer affected?: Yes
ISV affected?:
Waiting Support:
Flags outvoted (downgraded) after PO Review:
Ticket number:
Bug group (optional): External feedback
Max CVSS v3 score:

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Description Florian Best univentionstaff 2016-12-01 12:30:55 CET 
One of our UCS@school customers send us the following smbd crash.
It seems to be in relation with the exam users, when they try to access shares.
I asked for the core dump(s), they might follow.

[2016/11/02 17:26:58.643705,  0, pid=20903] ../source3/auth/pampass.c:89(smb_pam_error_handler)
  smb_pam_error_handler: PAM: session setup failed : User not known to the underlying authentication module
[2016/11/02 17:26:58.645257,  1, pid=20903] ../source3/smbd/session.c:70(session_claim)
  pam_session rejected the session for ZENSIERTESCHULE+exam-Benutzer.Name [smb/196512954]
[2016/11/02 17:26:58.645276,  1, pid=20903] ../source3/smbd/smb2_sesssetup.c:450(smbd_smb2_auth_generic_return)
  smb2: Failed to claim session for vuid=196512954
[2016/11/02 17:26:58.695698,  0, pid=20901] ../source3/auth/pampass.c:89(smb_pam_error_handler)
  smb_pam_error_handler: PAM: session setup failed : User not known to the underlying authentication module
[2016/11/02 17:26:58.696423,  1, pid=20901] ../source3/smbd/session.c:70(session_claim)
  pam_session rejected the session for ZENSIERTESCHULE+exam-Benutzer.Name [smb/196512954]
[2016/11/02 17:26:58.696436,  1, pid=20901] ../source3/smbd/smb2_sesssetup.c:450(smbd_smb2_auth_generic_return)
  smb2: Failed to claim session for vuid=196512954
[2016/11/02 17:26:58.696545,  0, pid=20901] ../source3/smbd/smbXsrv_session.c:1553(smbXsrv_session_logoff)
  smbXsrv_session_logoff(0x0bb68cba): failed to delete global key '0BB68CBA': NT_STATUS_NOT_FOUND
[2016/11/02 17:26:58.699472,  0, pid=20901] ../source3/smbd/smbXsrv_session.c:1662(smbXsrv_session_logoff_all)
  smbXsrv_session_logoff_all: count[1] errors[1] first[NT_STATUS_NOT_FOUND]
[2016/11/02 17:26:58.699488,  0, pid=20901] ../source3/smbd/server_exit.c:159(exit_server_common)
  Server exit (NT_STATUS_CONNECTION_DISCONNECTED)
[2016/11/02 17:26:58.699496,  0, pid=20901] ../source3/smbd/server_exit.c:162(exit_server_common)
  exit_server_common: smbXsrv_session_logoff_all() failed (NT_STATUS_NOT_FOUND) - triggering cleanup
[2016/11/02 17:26:58.700148,  0, pid=20901] ../source3/lib/util.c:789(smb_panic_s3)
  PANIC (pid 20901): smbXsrv_session_logoff_all failed
[2016/11/02 17:26:58.700664,  0, pid=20901] ../source3/lib/util.c:900(log_stack_trace)
  BACKTRACE: 23 stack frames:
   #0 /usr/lib/x86_64-linux-gnu/libsmbconf.so.0(log_stack_trace+0x1a) [0x7f43701974da]
   #1 /usr/lib/x86_64-linux-gnu/libsmbconf.so.0(smb_panic_s3+0x20) [0x7f43701975b0]
   #2 /usr/lib/x86_64-linux-gnu/libsamba-util.so.0(smb_panic+0x2f) [0x7f43722a6b9f]
   #3 /usr/lib/x86_64-linux-gnu/samba/libsmbd-base.so.0(+0x178168) [0x7f4371ec0168]
   #4 /usr/lib/x86_64-linux-gnu/samba/libsmbd-base.so.0(+0x17848e) [0x7f4371ec048e]
   #5 /usr/lib/x86_64-linux-gnu/samba/libsmbd-shim.so.0(exit_server_cleanly+0x12) [0x7f436fb56d42]
   #6 /usr/lib/x86_64-linux-gnu/samba/libsmbd-base.so.0(smbd_server_connection_terminate_ex+0x28) [0x7f4371e9df08]
   #7 /usr/lib/x86_64-linux-gnu/samba/libsmbd-base.so.0(+0x15cf0b) [0x7f4371ea4f0b]
   #8 /usr/lib/x86_64-linux-gnu/libtevent.so.0(_tevent_req_error+0x22) [0x7f436ebd5a42]
   #9 /usr/lib/x86_64-linux-gnu/libtevent.so.0(tevent_common_loop_immediate+0xe2) [0x7f436ebd5022]
   #10 /usr/lib/x86_64-linux-gnu/libsmbconf.so.0(run_events_poll+0x48) [0x7f43701ad4f8]
   #11 /usr/lib/x86_64-linux-gnu/libsmbconf.so.0(+0x3880b) [0x7f43701ad80b]
   #12 /usr/lib/x86_64-linux-gnu/libtevent.so.0(_tevent_loop_once+0x9d) [0x7f436ebd476d]
   #13 /usr/lib/x86_64-linux-gnu/libtevent.so.0(tevent_common_loop_wait+0x1b) [0x7f436ebd492b]
   #14 /usr/lib/x86_64-linux-gnu/samba/libsmbd-base.so.0(smbd_process+0x715) [0x7f4371e8f065]
   #15 /usr/sbin/smbd(+0xa006) [0x558b55eb3006]
   #16 /usr/lib/x86_64-linux-gnu/libsmbconf.so.0(run_events_poll+0x187) [0x7f43701ad637]
   #17 /usr/lib/x86_64-linux-gnu/libsmbconf.so.0(+0x388b9) [0x7f43701ad8b9]
   #18 /usr/lib/x86_64-linux-gnu/libtevent.so.0(_tevent_loop_once+0x9d) [0x7f436ebd476d]
   #19 /usr/lib/x86_64-linux-gnu/libtevent.so.0(tevent_common_loop_wait+0x1b) [0x7f436ebd492b]
   #20 /usr/sbin/smbd(main+0x15d6) [0x558b55eb0fa6]
   #21 /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xfd) [0x7f436e861ead]
   #22 /usr/sbin/smbd(+0x8375) [0x558b55eb1375]
[2016/11/02 17:26:58.700733,  0, pid=20901] ../source3/lib/dumpcore.c:318(dump_core)
  dumping core in /var/log/samba/cores/smbd
[2016/11/02 17:26:58.732960,  1, pid=3621] ../source3/smbd/server.c:486(remove_child_pid)
  Scheduled cleanup of brl and lock database after unclean shutdown
[2016/11/02 17:26:58.793262,  0, pid=20908] ../source3/auth/pampass.c:89(smb_pam_error_handler)
  smb_pam_error_handler: PAM: session setup failed : User not known to the underlying authentication module
[2016/11/02 17:26:58.794854,  1, pid=20908] ../source3/smbd/session.c:70(session_claim)
  pam_session rejected the session for ZENSIERTESCHULE+exam-Benutzer.Name [smb/2849920519]
[2016/11/02 17:26:58.794874,  1, pid=20908] ../source3/smbd/smb2_sesssetup.c:450(smbd_smb2_auth_generic_return)
  smb2: Failed to claim session for vuid=2849920519
[2016/11/02 17:26:58.846759,  0, pid=20905] ../source3/auth/pampass.c:89(smb_pam_error_handler)
  smb_pam_error_handler: PAM: session setup failed : User not known to the underlying authentication module
[2016/11/02 17:26:58.847485,  1, pid=20905] ../source3/smbd/session.c:70(session_claim)
  pam_session rejected the session for ZENSIERTESCHULE+exam-Benutzer.Name [smb/2849920519]
[2016/11/02 17:26:58.847497,  1, pid=20905] ../source3/smbd/smb2_sesssetup.c:450(smbd_smb2_auth_generic_return)
  smb2: Failed to claim session for vuid=2849920519
[2016/11/02 17:26:58.847601,  0, pid=20905] ../source3/smbd/smbXsrv_session.c:1553(smbXsrv_session_logoff)
  smbXsrv_session_logoff(0xa9de5607): failed to delete global key 'A9DE5607': NT_STATUS_NOT_FOUND
[2016/11/02 17:26:58.850517,  0, pid=20905] ../source3/smbd/smbXsrv_session.c:1662(smbXsrv_session_logoff_all)
  smbXsrv_session_logoff_all: count[1] errors[1] first[NT_STATUS_NOT_FOUND]
[2016/11/02 17:26:58.850532,  0, pid=20905] ../source3/smbd/server_exit.c:159(exit_server_common)
  Server exit (NT_STATUS_CONNECTION_DISCONNECTED)
[2016/11/02 17:26:58.850539,  0, pid=20905] ../source3/smbd/server_exit.c:162(exit_server_common)
  exit_server_common: smbXsrv_session_logoff_all() failed (NT_STATUS_NOT_FOUND) - triggering cleanup
[2016/11/02 17:26:58.851170,  0, pid=20905] ../source3/lib/util.c:789(smb_panic_s3)
  PANIC (pid 20905): smbXsrv_session_logoff_all failed
[2016/11/02 17:26:58.851672,  0, pid=20905] ../source3/lib/util.c:900(log_stack_trace)
  BACKTRACE: 23 stack frames:
   #0 /usr/lib/x86_64-linux-gnu/libsmbconf.so.0(log_stack_trace+0x1a) [0x7f43701974da]
   #1 /usr/lib/x86_64-linux-gnu/libsmbconf.so.0(smb_panic_s3+0x20) [0x7f43701975b0]
   #2 /usr/lib/x86_64-linux-gnu/libsamba-util.so.0(smb_panic+0x2f) [0x7f43722a6b9f]
   #3 /usr/lib/x86_64-linux-gnu/samba/libsmbd-base.so.0(+0x178168) [0x7f4371ec0168]
   #4 /usr/lib/x86_64-linux-gnu/samba/libsmbd-base.so.0(+0x17848e) [0x7f4371ec048e]
   #5 /usr/lib/x86_64-linux-gnu/samba/libsmbd-shim.so.0(exit_server_cleanly+0x12) [0x7f436fb56d42]
   #6 /usr/lib/x86_64-linux-gnu/samba/libsmbd-base.so.0(smbd_server_connection_terminate_ex+0x28) [0x7f4371e9df08]
   #7 /usr/lib/x86_64-linux-gnu/samba/libsmbd-base.so.0(+0x15cf0b) [0x7f4371ea4f0b]
   #8 /usr/lib/x86_64-linux-gnu/libtevent.so.0(_tevent_req_error+0x22) [0x7f436ebd5a42]
   #9 /usr/lib/x86_64-linux-gnu/libtevent.so.0(tevent_common_loop_immediate+0xe2) [0x7f436ebd5022]
   #10 /usr/lib/x86_64-linux-gnu/libsmbconf.so.0(run_events_poll+0x48) [0x7f43701ad4f8]
   #11 /usr/lib/x86_64-linux-gnu/libsmbconf.so.0(+0x3880b) [0x7f43701ad80b]
   #12 /usr/lib/x86_64-linux-gnu/libtevent.so.0(_tevent_loop_once+0x9d) [0x7f436ebd476d]
   #13 /usr/lib/x86_64-linux-gnu/libtevent.so.0(tevent_common_loop_wait+0x1b) [0x7f436ebd492b]
   #14 /usr/lib/x86_64-linux-gnu/samba/libsmbd-base.so.0(smbd_process+0x715) [0x7f4371e8f065]
   #15 /usr/sbin/smbd(+0xa006) [0x558b55eb3006]
   #16 /usr/lib/x86_64-linux-gnu/libsmbconf.so.0(run_events_poll+0x187) [0x7f43701ad637]
   #17 /usr/lib/x86_64-linux-gnu/libsmbconf.so.0(+0x388b9) [0x7f43701ad8b9]
   #18 /usr/lib/x86_64-linux-gnu/libtevent.so.0(_tevent_loop_once+0x9d) [0x7f436ebd476d]
   #19 /usr/lib/x86_64-linux-gnu/libtevent.so.0(tevent_common_loop_wait+0x1b) [0x7f436ebd492b]
   #20 /usr/sbin/smbd(main+0x15d6) [0x558b55eb0fa6]
   #21 /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xfd) [0x7f436e861ead]
   #22 /usr/sbin/smbd(+0x8375) [0x558b55eb1375]
[2016/11/02 17:26:58.851738,  0, pid=20905] ../source3/lib/dumpcore.c:318(dump_core)
  dumping core in /var/log/samba/cores/smbd
[2016/11/02 17:26:58.944296,  0, pid=20913] ../source3/auth/pampass.c:89(smb_pam_error_handler)
  smb_pam_error_handler: PAM: session setup failed : User not known to the underlying authentication module
[2016/11/02 17:26:58.945869,  1, pid=20913] ../source3/smbd/session.c:70(session_claim)
  pam_session rejected the session for ZENSIERTESCHULE+exam-Benutzer.Name [smb/98504799]
[2016/11/02 17:26:58.945889,  1, pid=20913] ../source3/smbd/smb2_sesssetup.c:450(smbd_smb2_auth_generic_return)
  smb2: Failed to claim session for vuid=98504799
[2016/11/02 17:26:58.997043,  0, pid=20910] ../source3/auth/pampass.c:89(smb_pam_error_handler)
  smb_pam_error_handler: PAM: session setup failed : User not known to the underlying authentication module
[2016/11/02 17:26:58.997776,  1, pid=20910] ../source3/smbd/session.c:70(session_claim)
  pam_session rejected the session for ZENSIERTESCHULE+exam-Benutzer.Name [smb/98504799]
[2016/11/02 17:26:58.997790,  1, pid=20910] ../source3/smbd/smb2_sesssetup.c:450(smbd_smb2_auth_generic_return)
  smb2: Failed to claim session for vuid=98504799
[2016/11/02 17:26:58.997900,  0, pid=20910] ../source3/smbd/smbXsrv_session.c:1553(smbXsrv_session_logoff)
  smbXsrv_session_logoff(0x05df105f): failed to delete global key '05DF105F': NT_STATUS_NOT_FOUND
[2016/11/02 17:26:59.000961,  0, pid=20910] ../source3/smbd/smbXsrv_session.c:1662(smbXsrv_session_logoff_all)
  smbXsrv_session_logoff_all: count[1] errors[1] first[NT_STATUS_NOT_FOUND]
[2016/11/02 17:26:59.000976,  0, pid=20910] ../source3/smbd/server_exit.c:159(exit_server_common)
  Server exit (NT_STATUS_CONNECTION_DISCONNECTED)
[2016/11/02 17:26:59.000983,  0, pid=20910] ../source3/smbd/server_exit.c:162(exit_server_common)
  exit_server_common: smbXsrv_session_logoff_all() failed (NT_STATUS_NOT_FOUND) - triggering cleanup
[2016/11/02 17:26:59.001653,  0, pid=20910] ../source3/lib/util.c:789(smb_panic_s3)
  PANIC (pid 20910): smbXsrv_session_logoff_all failed
[2016/11/02 17:26:59.002173,  0, pid=20910] ../source3/lib/util.c:900(log_stack_trace)
  BACKTRACE: 23 stack frames:
   #0 /usr/lib/x86_64-linux-gnu/libsmbconf.so.0(log_stack_trace+0x1a) [0x7f43701974da]
   #1 /usr/lib/x86_64-linux-gnu/libsmbconf.so.0(smb_panic_s3+0x20) [0x7f43701975b0]
   #2 /usr/lib/x86_64-linux-gnu/libsamba-util.so.0(smb_panic+0x2f) [0x7f43722a6b9f]
   #3 /usr/lib/x86_64-linux-gnu/samba/libsmbd-base.so.0(+0x178168) [0x7f4371ec0168]
   #4 /usr/lib/x86_64-linux-gnu/samba/libsmbd-base.so.0(+0x17848e) [0x7f4371ec048e]
   #5 /usr/lib/x86_64-linux-gnu/samba/libsmbd-shim.so.0(exit_server_cleanly+0x12) [0x7f436fb56d42]
   #6 /usr/lib/x86_64-linux-gnu/samba/libsmbd-base.so.0(smbd_server_connection_terminate_ex+0x28) [0x7f4371e9df08]
   #7 /usr/lib/x86_64-linux-gnu/samba/libsmbd-base.so.0(+0x15cf0b) [0x7f4371ea4f0b]
   #8 /usr/lib/x86_64-linux-gnu/libtevent.so.0(_tevent_req_error+0x22) [0x7f436ebd5a42]
   #9 /usr/lib/x86_64-linux-gnu/libtevent.so.0(tevent_common_loop_immediate+0xe2) [0x7f436ebd5022]
   #10 /usr/lib/x86_64-linux-gnu/libsmbconf.so.0(run_events_poll+0x48) [0x7f43701ad4f8]
   #11 /usr/lib/x86_64-linux-gnu/libsmbconf.so.0(+0x3880b) [0x7f43701ad80b]
   #12 /usr/lib/x86_64-linux-gnu/libtevent.so.0(_tevent_loop_once+0x9d) [0x7f436ebd476d]
   #13 /usr/lib/x86_64-linux-gnu/libtevent.so.0(tevent_common_loop_wait+0x1b) [0x7f436ebd492b]
   #14 /usr/lib/x86_64-linux-gnu/samba/libsmbd-base.so.0(smbd_process+0x715) [0x7f4371e8f065]
   #15 /usr/sbin/smbd(+0xa006) [0x558b55eb3006]
   #16 /usr/lib/x86_64-linux-gnu/libsmbconf.so.0(run_events_poll+0x187) [0x7f43701ad637]
   #17 /usr/lib/x86_64-linux-gnu/libsmbconf.so.0(+0x388b9) [0x7f43701ad8b9]
   #18 /usr/lib/x86_64-linux-gnu/libtevent.so.0(_tevent_loop_once+0x9d) [0x7f436ebd476d]
   #19 /usr/lib/x86_64-linux-gnu/libtevent.so.0(tevent_common_loop_wait+0x1b) [0x7f436ebd492b]
   #20 /usr/sbin/smbd(main+0x15d6) [0x558b55eb0fa6]
   #21 /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xfd) [0x7f436e861ead]
   #22 /usr/sbin/smbd(+0x8375) [0x558b55eb1375]
[2016/11/02 17:26:59.002235,  0, pid=20910] ../source3/lib/dumpcore.c:318(dump_core)
  dumping core in /var/log/samba/cores/smbd
[2016/11/02 17:26:59.107324,  0, pid=20918] ../source3/auth/pampass.c:89(smb_pam_error_handler)
  smb_pam_error_handler: PAM: session setup failed : User not known to the underlying authentication module
[2016/11/02 17:26:59.109451,  1, pid=20918] ../source3/smbd/session.c:70(session_claim)
  pam_session rejected the session for ZENSIERTESCHULE+exam-Benutzer.Name [smb/2439841655]
[2016/11/02 17:26:59.109472,  1, pid=20918] ../source3/smbd/smb2_sesssetup.c:450(smbd_smb2_auth_generic_return)
  smb2: Failed to claim session for vuid=2439841655
[2016/11/02 17:26:59.160198,  0, pid=20915] ../source3/auth/pampass.c:89(smb_pam_error_handler)
  smb_pam_error_handler: PAM: session setup failed : User not known to the underlying authentication module
[2016/11/02 17:26:59.161017,  1, pid=20915] ../source3/smbd/session.c:70(session_claim)
  pam_session rejected the session for ZENSIERTESCHULE+exam-Benutzer.Name [smb/2439841655]
[2016/11/02 17:26:59.161033,  1, pid=20915] ../source3/smbd/smb2_sesssetup.c:450(smbd_smb2_auth_generic_return)
  smb2: Failed to claim session for vuid=2439841655
[2016/11/02 17:26:59.161167,  0, pid=20915] ../source3/smbd/smbXsrv_session.c:1553(smbXsrv_session_logoff)
  smbXsrv_session_logoff(0x916d0777): failed to delete global key '916D0777': NT_STATUS_NOT_FOUND
[2016/11/02 17:26:59.164634,  0, pid=20915] ../source3/smbd/smbXsrv_session.c:1662(smbXsrv_session_logoff_all)
  smbXsrv_session_logoff_all: count[1] errors[1] first[NT_STATUS_NOT_FOUND]
[2016/11/02 17:26:59.164651,  0, pid=20915] ../source3/smbd/server_exit.c:159(exit_server_common)
  Server exit (NT_STATUS_CONNECTION_DISCONNECTED)
[2016/11/02 17:26:59.164659,  0, pid=20915] ../source3/smbd/server_exit.c:162(exit_server_common)
  exit_server_common: smbXsrv_session_logoff_all() failed (NT_STATUS_NOT_FOUND) - triggering cleanup
[2016/11/02 17:26:59.165345,  0, pid=20915] ../source3/lib/util.c:789(smb_panic_s3)
  PANIC (pid 20915): smbXsrv_session_logoff_all failed
[2016/11/02 17:26:59.165931,  0, pid=20915] ../source3/lib/util.c:900(log_stack_trace)
  BACKTRACE: 23 stack frames:
   #0 /usr/lib/x86_64-linux-gnu/libsmbconf.so.0(log_stack_trace+0x1a) [0x7f43701974da]
   #1 /usr/lib/x86_64-linux-gnu/libsmbconf.so.0(smb_panic_s3+0x20) [0x7f43701975b0]
   #2 /usr/lib/x86_64-linux-gnu/libsamba-util.so.0(smb_panic+0x2f) [0x7f43722a6b9f]
   #3 /usr/lib/x86_64-linux-gnu/samba/libsmbd-base.so.0(+0x178168) [0x7f4371ec0168]
   #4 /usr/lib/x86_64-linux-gnu/samba/libsmbd-base.so.0(+0x17848e) [0x7f4371ec048e]
   #5 /usr/lib/x86_64-linux-gnu/samba/libsmbd-shim.so.0(exit_server_cleanly+0x12) [0x7f436fb56d42]
   #6 /usr/lib/x86_64-linux-gnu/samba/libsmbd-base.so.0(smbd_server_connection_terminate_ex+0x28) [0x7f4371e9df08]
   #7 /usr/lib/x86_64-linux-gnu/samba/libsmbd-base.so.0(+0x15cf0b) [0x7f4371ea4f0b]
   #8 /usr/lib/x86_64-linux-gnu/libtevent.so.0(_tevent_req_error+0x22) [0x7f436ebd5a42]
   #9 /usr/lib/x86_64-linux-gnu/libtevent.so.0(tevent_common_loop_immediate+0xe2) [0x7f436ebd5022]
   #10 /usr/lib/x86_64-linux-gnu/libsmbconf.so.0(run_events_poll+0x48) [0x7f43701ad4f8]
   #11 /usr/lib/x86_64-linux-gnu/libsmbconf.so.0(+0x3880b) [0x7f43701ad80b]
   #12 /usr/lib/x86_64-linux-gnu/libtevent.so.0(_tevent_loop_once+0x9d) [0x7f436ebd476d]
   #13 /usr/lib/x86_64-linux-gnu/libtevent.so.0(tevent_common_loop_wait+0x1b) [0x7f436ebd492b]
   #14 /usr/lib/x86_64-linux-gnu/samba/libsmbd-base.so.0(smbd_process+0x715) [0x7f4371e8f065]
   #15 /usr/sbin/smbd(+0xa006) [0x558b55eb3006]
   #16 /usr/lib/x86_64-linux-gnu/libsmbconf.so.0(run_events_poll+0x187) [0x7f43701ad637]
   #17 /usr/lib/x86_64-linux-gnu/libsmbconf.so.0(+0x388b9) [0x7f43701ad8b9]
   #18 /usr/lib/x86_64-linux-gnu/libtevent.so.0(_tevent_loop_once+0x9d) [0x7f436ebd476d]
   #19 /usr/lib/x86_64-linux-gnu/libtevent.so.0(tevent_common_loop_wait+0x1b) [0x7f436ebd492b]
   #20 /usr/sbin/smbd(main+0x15d6) [0x558b55eb0fa6]
   #21 /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xfd) [0x7f436e861ead]
   #22 /usr/sbin/smbd(+0x8375) [0x558b55eb1375]
[2016/11/02 17:26:59.165996,  0, pid=20915] ../source3/lib/dumpcore.c:318(dump_core)
  dumping core in /var/log/samba/cores/smbd
[2016/11/02 17:27:18.735869,  1, pid=3621] ../source3/smbd/server.c:429(cleanup_timeout_fn)
  Cleaning up brl and lock database after unclean shutdown
[2016/11/02 19:16:07.517314,  0, pid=31982] ../source3/auth/pampass.c:89(smb_pam_error_handler)
  smb_pam_error_handler: PAM: session setup failed : User not known to the underlying authentication module
[2016/11/02 19:16:07.518907,  1, pid=31982] ../source3/smbd/session.c:70(session_claim)
  pam_session rejected the session for ZENSIERTESCHULE+exam-Benutzer.Name [smb/2690445347]
[2016/11/02 19:16:07.518929,  1, pid=31982] ../source3/smbd/smb2_sesssetup.c:450(smbd_smb2_auth_generic_return)
  smb2: Failed to claim session for vuid=2690445347
[2016/11/02 19:16:07.571101,  0, pid=31980] ../source3/auth/pampass.c:89(smb_pam_error_handler)
  smb_pam_error_handler: PAM: session setup failed : User not known to the underlying authentication module
[2016/11/02 19:16:07.571812,  1, pid=31980] ../source3/smbd/session.c:70(session_claim)
  pam_session rejected the session for ZENSIERTESCHULE+exam-Benutzer.Name [smb/2690445347]
[2016/11/02 19:16:07.571824,  1, pid=31980] ../source3/smbd/smb2_sesssetup.c:450(smbd_smb2_auth_generic_return)
  smb2: Failed to claim session for vuid=2690445347
[2016/11/02 19:16:07.571934,  0, pid=31980] ../source3/smbd/smbXsrv_session.c:1553(smbXsrv_session_logoff)
  smbXsrv_session_logoff(0xa05cf023): failed to delete global key 'A05CF023': NT_STATUS_NOT_FOUND
[2016/11/02 19:16:07.574830,  0, pid=31980] ../source3/smbd/smbXsrv_session.c:1662(smbXsrv_session_logoff_all)
  smbXsrv_session_logoff_all: count[1] errors[1] first[NT_STATUS_NOT_FOUND]
[2016/11/02 19:16:07.574846,  0, pid=31980] ../source3/smbd/server_exit.c:159(exit_server_common)
  Server exit (NT_STATUS_CONNECTION_DISCONNECTED)
[2016/11/02 19:16:07.574854,  0, pid=31980] ../source3/smbd/server_exit.c:162(exit_server_common)
  exit_server_common: smbXsrv_session_logoff_all() failed (NT_STATUS_NOT_FOUND) - triggering cleanup
[2016/11/02 19:16:07.575489,  0, pid=31980] ../source3/lib/util.c:789(smb_panic_s3)
  PANIC (pid 31980): smbXsrv_session_logoff_all failed
[2016/11/02 19:16:07.575993,  0, pid=31980] ../source3/lib/util.c:900(log_stack_trace)
  BACKTRACE: 23 stack frames:
   #0 /usr/lib/x86_64-linux-gnu/libsmbconf.so.0(log_stack_trace+0x1a) [0x7f43701974da]
   #1 /usr/lib/x86_64-linux-gnu/libsmbconf.so.0(smb_panic_s3+0x20) [0x7f43701975b0]
   #2 /usr/lib/x86_64-linux-gnu/libsamba-util.so.0(smb_panic+0x2f) [0x7f43722a6b9f]
   #3 /usr/lib/x86_64-linux-gnu/samba/libsmbd-base.so.0(+0x178168) [0x7f4371ec0168]
   #4 /usr/lib/x86_64-linux-gnu/samba/libsmbd-base.so.0(+0x17848e) [0x7f4371ec048e]
   #5 /usr/lib/x86_64-linux-gnu/samba/libsmbd-shim.so.0(exit_server_cleanly+0x12) [0x7f436fb56d42]
   #6 /usr/lib/x86_64-linux-gnu/samba/libsmbd-base.so.0(smbd_server_connection_terminate_ex+0x28) [0x7f4371e9df08]
   #7 /usr/lib/x86_64-linux-gnu/samba/libsmbd-base.so.0(+0x15cf0b) [0x7f4371ea4f0b]
   #8 /usr/lib/x86_64-linux-gnu/libtevent.so.0(_tevent_req_error+0x22) [0x7f436ebd5a42]
   #9 /usr/lib/x86_64-linux-gnu/libtevent.so.0(tevent_common_loop_immediate+0xe2) [0x7f436ebd5022]
   #10 /usr/lib/x86_64-linux-gnu/libsmbconf.so.0(run_events_poll+0x48) [0x7f43701ad4f8]
   #11 /usr/lib/x86_64-linux-gnu/libsmbconf.so.0(+0x3880b) [0x7f43701ad80b]
   #12 /usr/lib/x86_64-linux-gnu/libtevent.so.0(_tevent_loop_once+0x9d) [0x7f436ebd476d]
   #13 /usr/lib/x86_64-linux-gnu/libtevent.so.0(tevent_common_loop_wait+0x1b) [0x7f436ebd492b]
   #14 /usr/lib/x86_64-linux-gnu/samba/libsmbd-base.so.0(smbd_process+0x715) [0x7f4371e8f065]
   #15 /usr/sbin/smbd(+0xa006) [0x558b55eb3006]
   #16 /usr/lib/x86_64-linux-gnu/libsmbconf.so.0(run_events_poll+0x187) [0x7f43701ad637]
   #17 /usr/lib/x86_64-linux-gnu/libsmbconf.so.0(+0x388b9) [0x7f43701ad8b9]
   #18 /usr/lib/x86_64-linux-gnu/libtevent.so.0(_tevent_loop_once+0x9d) [0x7f436ebd476d]
   #19 /usr/lib/x86_64-linux-gnu/libtevent.so.0(tevent_common_loop_wait+0x1b) [0x7f436ebd492b]
   #20 /usr/sbin/smbd(main+0x15d6) [0x558b55eb0fa6]
   #21 /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xfd) [0x7f436e861ead]
   #22 /usr/sbin/smbd(+0x8375) [0x558b55eb1375]
[2016/11/02 19:16:07.576057,  0, pid=31980] ../source3/lib/dumpcore.c:318(dump_core)
  dumping core in /var/log/samba/cores/smbd
[2016/11/02 19:16:07.608196,  1, pid=3621] ../source3/smbd/server.c:486(remove_child_pid)
  Scheduled cleanup of brl and lock database after unclean shutdown
[2016/11/02 19:16:07.667414,  0, pid=31987] ../source3/auth/pampass.c:89(smb_pam_error_handler)
  smb_pam_error_handler: PAM: session setup failed : User not known to the underlying authentication module
[2016/11/02 19:16:07.669067,  1, pid=31987] ../source3/smbd/session.c:70(session_claim)
  pam_session rejected the session for ZENSIERTESCHULE+exam-Benutzer.Name [smb/2034116196]
[2016/11/02 19:16:07.669088,  1, pid=31987] ../source3/smbd/smb2_sesssetup.c:450(smbd_smb2_auth_generic_return)
  smb2: Failed to claim session for vuid=2034116196
[2016/11/02 19:16:07.725211,  0, pid=31984] ../source3/auth/pampass.c:89(smb_pam_error_handler)
  smb_pam_error_handler: PAM: session setup failed : User not known to the underlying authentication module
[2016/11/02 19:16:07.726051,  1, pid=31984] ../source3/smbd/session.c:70(session_claim)
  pam_session rejected the session for ZENSIERTESCHULE+exam-Benutzer.Name [smb/2034116196]
[2016/11/02 19:16:07.726068,  1, pid=31984] ../source3/smbd/smb2_sesssetup.c:450(smbd_smb2_auth_generic_return)
  smb2: Failed to claim session for vuid=2034116196
[2016/11/02 19:16:07.726175,  0, pid=31984] ../source3/smbd/smbXsrv_session.c:1553(smbXsrv_session_logoff)
  smbXsrv_session_logoff(0x793e2664): failed to delete global key '793E2664': NT_STATUS_NOT_FOUND
[2016/11/02 19:16:07.729230,  0, pid=31984] ../source3/smbd/smbXsrv_session.c:1662(smbXsrv_session_logoff_all)
  smbXsrv_session_logoff_all: count[1] errors[1] first[NT_STATUS_NOT_FOUND]
[2016/11/02 19:16:07.729245,  0, pid=31984] ../source3/smbd/server_exit.c:159(exit_server_common)
  Server exit (NT_STATUS_CONNECTION_DISCONNECTED)
[2016/11/02 19:16:07.729253,  0, pid=31984] ../source3/smbd/server_exit.c:162(exit_server_common)
  exit_server_common: smbXsrv_session_logoff_all() failed (NT_STATUS_NOT_FOUND) - triggering cleanup
[2016/11/02 19:16:07.729940,  0, pid=31984] ../source3/lib/util.c:789(smb_panic_s3)
  PANIC (pid 31984): smbXsrv_session_logoff_all failed
[2016/11/02 19:16:07.730551,  0, pid=31984] ../source3/lib/util.c:900(log_stack_trace)
  BACKTRACE: 23 stack frames:
   #0 /usr/lib/x86_64-linux-gnu/libsmbconf.so.0(log_stack_trace+0x1a) [0x7f43701974da]
   #1 /usr/lib/x86_64-linux-gnu/libsmbconf.so.0(smb_panic_s3+0x20) [0x7f43701975b0]
   #2 /usr/lib/x86_64-linux-gnu/libsamba-util.so.0(smb_panic+0x2f) [0x7f43722a6b9f]
   #3 /usr/lib/x86_64-linux-gnu/samba/libsmbd-base.so.0(+0x178168) [0x7f4371ec0168]
   #4 /usr/lib/x86_64-linux-gnu/samba/libsmbd-base.so.0(+0x17848e) [0x7f4371ec048e]
   #5 /usr/lib/x86_64-linux-gnu/samba/libsmbd-shim.so.0(exit_server_cleanly+0x12) [0x7f436fb56d42]
   #6 /usr/lib/x86_64-linux-gnu/samba/libsmbd-base.so.0(smbd_server_connection_terminate_ex+0x28) [0x7f4371e9df08]
   #7 /usr/lib/x86_64-linux-gnu/samba/libsmbd-base.so.0(+0x15cf0b) [0x7f4371ea4f0b]
   #8 /usr/lib/x86_64-linux-gnu/libtevent.so.0(_tevent_req_error+0x22) [0x7f436ebd5a42]
   #9 /usr/lib/x86_64-linux-gnu/libtevent.so.0(tevent_common_loop_immediate+0xe2) [0x7f436ebd5022]
   #10 /usr/lib/x86_64-linux-gnu/libsmbconf.so.0(run_events_poll+0x48) [0x7f43701ad4f8]
   #11 /usr/lib/x86_64-linux-gnu/libsmbconf.so.0(+0x3880b) [0x7f43701ad80b]
   #12 /usr/lib/x86_64-linux-gnu/libtevent.so.0(_tevent_loop_once+0x9d) [0x7f436ebd476d]
   #13 /usr/lib/x86_64-linux-gnu/libtevent.so.0(tevent_common_loop_wait+0x1b) [0x7f436ebd492b]
   #14 /usr/lib/x86_64-linux-gnu/samba/libsmbd-base.so.0(smbd_process+0x715) [0x7f4371e8f065]
   #15 /usr/sbin/smbd(+0xa006) [0x558b55eb3006]
   #16 /usr/lib/x86_64-linux-gnu/libsmbconf.so.0(run_events_poll+0x187) [0x7f43701ad637]
   #17 /usr/lib/x86_64-linux-gnu/libsmbconf.so.0(+0x388b9) [0x7f43701ad8b9]
   #18 /usr/lib/x86_64-linux-gnu/libtevent.so.0(_tevent_loop_once+0x9d) [0x7f436ebd476d]
   #19 /usr/lib/x86_64-linux-gnu/libtevent.so.0(tevent_common_loop_wait+0x1b) [0x7f436ebd492b]
   #20 /usr/sbin/smbd(main+0x15d6) [0x558b55eb0fa6]
   #21 /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xfd) [0x7f436e861ead]
   #22 /usr/sbin/smbd(+0x8375) [0x558b55eb1375]
[2016/11/02 19:16:07.730613,  0, pid=31984] ../source3/lib/dumpcore.c:318(dump_core)
  dumping core in /var/log/samba/cores/smbd
[2016/11/02 19:16:07.821364,  0, pid=31993] ../source3/auth/pampass.c:89(smb_pam_error_handler)
  smb_pam_error_handler: PAM: session setup failed : User not known to the underlying authentication module
[2016/11/02 19:16:07.823189,  1, pid=31993] ../source3/smbd/session.c:70(session_claim)
  pam_session rejected the session for ZENSIERTESCHULE+exam-Benutzer.Name [smb/3215073105]
[2016/11/02 19:16:07.823219,  1, pid=31993] ../source3/smbd/smb2_sesssetup.c:450(smbd_smb2_auth_generic_return)
  smb2: Failed to claim session for vuid=3215073105
[2016/11/02 19:16:07.890048,  0, pid=31989] ../source3/auth/pampass.c:89(smb_pam_error_handler)
  smb_pam_error_handler: PAM: session setup failed : User not known to the underlying authentication module
[2016/11/02 19:16:07.890862,  1, pid=31989] ../source3/smbd/session.c:70(session_claim)
  pam_session rejected the session for ZENSIERTESCHULE+exam-Benutzer.Name [smb/3215073105]
[2016/11/02 19:16:07.890882,  1, pid=31989] ../source3/smbd/smb2_sesssetup.c:450(smbd_smb2_auth_generic_return)
  smb2: Failed to claim session for vuid=3215073105
[2016/11/02 19:16:07.891037,  0, pid=31989] ../source3/smbd/smbXsrv_session.c:1553(smbXsrv_session_logoff)
  smbXsrv_session_logoff(0xbfa21f51): failed to delete global key 'BFA21F51': NT_STATUS_NOT_FOUND
[2016/11/02 19:16:07.894454,  0, pid=31989] ../source3/smbd/smbXsrv_session.c:1662(smbXsrv_session_logoff_all)
  smbXsrv_session_logoff_all: count[1] errors[1] first[NT_STATUS_NOT_FOUND]
[2016/11/02 19:16:07.894470,  0, pid=31989] ../source3/smbd/server_exit.c:159(exit_server_common)
  Server exit (NT_STATUS_CONNECTION_DISCONNECTED)
[2016/11/02 19:16:07.894477,  0, pid=31989] ../source3/smbd/server_exit.c:162(exit_server_common)
  exit_server_common: smbXsrv_session_logoff_all() failed (NT_STATUS_NOT_FOUND) - triggering cleanup
[2016/11/02 19:16:07.895170,  0, pid=31989] ../source3/lib/util.c:789(smb_panic_s3)
  PANIC (pid 31989): smbXsrv_session_logoff_all failed
[2016/11/02 19:16:07.895688,  0, pid=31989] ../source3/lib/util.c:900(log_stack_trace)
  BACKTRACE: 23 stack frames:
   #0 /usr/lib/x86_64-linux-gnu/libsmbconf.so.0(log_stack_trace+0x1a) [0x7f43701974da]
   #1 /usr/lib/x86_64-linux-gnu/libsmbconf.so.0(smb_panic_s3+0x20) [0x7f43701975b0]
   #2 /usr/lib/x86_64-linux-gnu/libsamba-util.so.0(smb_panic+0x2f) [0x7f43722a6b9f]
   #3 /usr/lib/x86_64-linux-gnu/samba/libsmbd-base.so.0(+0x178168) [0x7f4371ec0168]
   #4 /usr/lib/x86_64-linux-gnu/samba/libsmbd-base.so.0(+0x17848e) [0x7f4371ec048e]
   #5 /usr/lib/x86_64-linux-gnu/samba/libsmbd-shim.so.0(exit_server_cleanly+0x12) [0x7f436fb56d42]
   #6 /usr/lib/x86_64-linux-gnu/samba/libsmbd-base.so.0(smbd_server_connection_terminate_ex+0x28) [0x7f4371e9df08]
   #7 /usr/lib/x86_64-linux-gnu/samba/libsmbd-base.so.0(+0x15cf0b) [0x7f4371ea4f0b]
   #8 /usr/lib/x86_64-linux-gnu/libtevent.so.0(_tevent_req_error+0x22) [0x7f436ebd5a42]
   #9 /usr/lib/x86_64-linux-gnu/libtevent.so.0(tevent_common_loop_immediate+0xe2) [0x7f436ebd5022]
   #10 /usr/lib/x86_64-linux-gnu/libsmbconf.so.0(run_events_poll+0x48) [0x7f43701ad4f8]
   #11 /usr/lib/x86_64-linux-gnu/libsmbconf.so.0(+0x3880b) [0x7f43701ad80b]
   #12 /usr/lib/x86_64-linux-gnu/libtevent.so.0(_tevent_loop_once+0x9d) [0x7f436ebd476d]
   #13 /usr/lib/x86_64-linux-gnu/libtevent.so.0(tevent_common_loop_wait+0x1b) [0x7f436ebd492b]
   #14 /usr/lib/x86_64-linux-gnu/samba/libsmbd-base.so.0(smbd_process+0x715) [0x7f4371e8f065]
   #15 /usr/sbin/smbd(+0xa006) [0x558b55eb3006]
   #16 /usr/lib/x86_64-linux-gnu/libsmbconf.so.0(run_events_poll+0x187) [0x7f43701ad637]
   #17 /usr/lib/x86_64-linux-gnu/libsmbconf.so.0(+0x388b9) [0x7f43701ad8b9]
   #18 /usr/lib/x86_64-linux-gnu/libtevent.so.0(_tevent_loop_once+0x9d) [0x7f436ebd476d]
   #19 /usr/lib/x86_64-linux-gnu/libtevent.so.0(tevent_common_loop_wait+0x1b) [0x7f436ebd492b]
   #20 /usr/sbin/smbd(main+0x15d6) [0x558b55eb0fa6]
   #21 /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xfd) [0x7f436e861ead]
   #22 /usr/sbin/smbd(+0x8375) [0x558b55eb1375]
[2016/11/02 19:16:07.895748,  0, pid=31989] ../source3/lib/dumpcore.c:318(dump_core)
  dumping core in /var/log/samba/cores/smbd
[2016/11/02 19:16:07.979421,  0, pid=31998] ../source3/auth/pampass.c:89(smb_pam_error_handler)
  smb_pam_error_handler: PAM: session setup failed : User not known to the underlying authentication module
[2016/11/02 19:16:07.981390,  1, pid=31998] ../source3/smbd/session.c:70(session_claim)
  pam_session rejected the session for ZENSIERTESCHULE+exam-Benutzer.Name [smb/829713322]
[2016/11/02 19:16:07.981417,  1, pid=31998] ../source3/smbd/smb2_sesssetup.c:450(smbd_smb2_auth_generic_return)
  smb2: Failed to claim session for vuid=829713322
[2016/11/02 19:16:08.033841,  0, pid=31995] ../source3/auth/pampass.c:89(smb_pam_error_handler)
  smb_pam_error_handler: PAM: session setup failed : User not known to the underlying authentication module
[2016/11/02 19:16:08.034569,  1, pid=31995] ../source3/smbd/session.c:70(session_claim)
  pam_session rejected the session for ZENSIERTESCHULE+exam-Benutzer.Name [smb/829713322]
[2016/11/02 19:16:08.034581,  1, pid=31995] ../source3/smbd/smb2_sesssetup.c:450(smbd_smb2_auth_generic_return)
  smb2: Failed to claim session for vuid=829713322
[2016/11/02 19:16:08.034704,  0, pid=31995] ../source3/smbd/smbXsrv_session.c:1553(smbXsrv_session_logoff)
  smbXsrv_session_logoff(0x31746baa): failed to delete global key '31746BAA': NT_STATUS_NOT_FOUND
[2016/11/02 19:16:08.037752,  0, pid=31995] ../source3/smbd/smbXsrv_session.c:1662(smbXsrv_session_logoff_all)
  smbXsrv_session_logoff_all: count[1] errors[1] first[NT_STATUS_NOT_FOUND]
[2016/11/02 19:16:08.037768,  0, pid=31995] ../source3/smbd/server_exit.c:159(exit_server_common)
  Server exit (NT_STATUS_CONNECTION_DISCONNECTED)
[2016/11/02 19:16:08.037776,  0, pid=31995] ../source3/smbd/server_exit.c:162(exit_server_common)
  exit_server_common: smbXsrv_session_logoff_all() failed (NT_STATUS_NOT_FOUND) - triggering cleanup
[2016/11/02 19:16:08.038408,  0, pid=31995] ../source3/lib/util.c:789(smb_panic_s3)
  PANIC (pid 31995): smbXsrv_session_logoff_all failed
[2016/11/02 19:16:08.038914,  0, pid=31995] ../source3/lib/util.c:900(log_stack_trace)
  BACKTRACE: 23 stack frames:
   #0 /usr/lib/x86_64-linux-gnu/libsmbconf.so.0(log_stack_trace+0x1a) [0x7f43701974da]
   #1 /usr/lib/x86_64-linux-gnu/libsmbconf.so.0(smb_panic_s3+0x20) [0x7f43701975b0]
   #2 /usr/lib/x86_64-linux-gnu/libsamba-util.so.0(smb_panic+0x2f) [0x7f43722a6b9f]
   #3 /usr/lib/x86_64-linux-gnu/samba/libsmbd-base.so.0(+0x178168) [0x7f4371ec0168]
   #4 /usr/lib/x86_64-linux-gnu/samba/libsmbd-base.so.0(+0x17848e) [0x7f4371ec048e]
   #5 /usr/lib/x86_64-linux-gnu/samba/libsmbd-shim.so.0(exit_server_cleanly+0x12) [0x7f436fb56d42]
   #6 /usr/lib/x86_64-linux-gnu/samba/libsmbd-base.so.0(smbd_server_connection_terminate_ex+0x28) [0x7f4371e9df08]
   #7 /usr/lib/x86_64-linux-gnu/samba/libsmbd-base.so.0(+0x15cf0b) [0x7f4371ea4f0b]
   #8 /usr/lib/x86_64-linux-gnu/libtevent.so.0(_tevent_req_error+0x22) [0x7f436ebd5a42]
   #9 /usr/lib/x86_64-linux-gnu/libtevent.so.0(tevent_common_loop_immediate+0xe2) [0x7f436ebd5022]
   #10 /usr/lib/x86_64-linux-gnu/libsmbconf.so.0(run_events_poll+0x48) [0x7f43701ad4f8]
   #11 /usr/lib/x86_64-linux-gnu/libsmbconf.so.0(+0x3880b) [0x7f43701ad80b]
   #12 /usr/lib/x86_64-linux-gnu/libtevent.so.0(_tevent_loop_once+0x9d) [0x7f436ebd476d]
   #13 /usr/lib/x86_64-linux-gnu/libtevent.so.0(tevent_common_loop_wait+0x1b) [0x7f436ebd492b]
   #14 /usr/lib/x86_64-linux-gnu/samba/libsmbd-base.so.0(smbd_process+0x715) [0x7f4371e8f065]
   #15 /usr/sbin/smbd(+0xa006) [0x558b55eb3006]
   #16 /usr/lib/x86_64-linux-gnu/libsmbconf.so.0(run_events_poll+0x187) [0x7f43701ad637]
   #17 /usr/lib/x86_64-linux-gnu/libsmbconf.so.0(+0x388b9) [0x7f43701ad8b9]
   #18 /usr/lib/x86_64-linux-gnu/libtevent.so.0(_tevent_loop_once+0x9d) [0x7f436ebd476d]
   #19 /usr/lib/x86_64-linux-gnu/libtevent.so.0(tevent_common_loop_wait+0x1b) [0x7f436ebd492b]
   #20 /usr/sbin/smbd(main+0x15d6) [0x558b55eb0fa6]
   #21 /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xfd) [0x7f436e861ead]
   #22 /usr/sbin/smbd(+0x8375) [0x558b55eb1375]
[2016/11/02 19:16:08.038976,  0, pid=31995] ../source3/lib/dumpcore.c:318(dump_core)
  dumping core in /var/log/samba/cores/smbd
[2016/11/02 19:16:27.627546,  1, pid=3621] ../source3/smbd/server.c:429(cleanup_timeout_fn)
  Cleaning up brl and lock database after unclean shutdown
[2016/11/02 21:14:16.393758,  0, pid=11316] ../source3/auth/pampass.c:89(smb_pam_error_handler)
  smb_pam_error_handler: PAM: session setup failed : User not known to the underlying authentication module
[2016/11/02 21:14:16.395345,  1, pid=11316] ../source3/smbd/session.c:70(session_claim)
  pam_session rejected the session for ZENSIERTESCHULE+exam-Benutzer.Name [smb/3242950662]
[2016/11/02 21:14:16.395364,  1, pid=11316] ../source3/smbd/smb2_sesssetup.c:450(smbd_smb2_auth_generic_return)
  smb2: Failed to claim session for vuid=3242950662
[2016/11/02 21:14:16.446049,  0, pid=11314] ../source3/auth/pampass.c:89(smb_pam_error_handler)
  smb_pam_error_handler: PAM: session setup failed : User not known to the underlying authentication module
[2016/11/02 21:14:16.446784,  1, pid=11314] ../source3/smbd/session.c:70(session_claim)
  pam_session rejected the session for ZENSIERTESCHULE+exam-Benutzer.Name [smb/3242950662]
[2016/11/02 21:14:16.446797,  1, pid=11314] ../source3/smbd/smb2_sesssetup.c:450(smbd_smb2_auth_generic_return)
  smb2: Failed to claim session for vuid=3242950662
[2016/11/02 21:14:16.446907,  0, pid=11314] ../source3/smbd/smbXsrv_session.c:1553(smbXsrv_session_logoff)
  smbXsrv_session_logoff(0xc14b8006): failed to delete global key 'C14B8006': NT_STATUS_NOT_FOUND
[2016/11/02 21:14:16.449905,  0, pid=11314] ../source3/smbd/smbXsrv_session.c:1662(smbXsrv_session_logoff_all)
  smbXsrv_session_logoff_all: count[1] errors[1] first[NT_STATUS_NOT_FOUND]
[2016/11/02 21:14:16.449921,  0, pid=11314] ../source3/smbd/server_exit.c:159(exit_server_common)
  Server exit (NT_STATUS_CONNECTION_DISCONNECTED)
[2016/11/02 21:14:16.449928,  0, pid=11314] ../source3/smbd/server_exit.c:162(exit_server_common)
  exit_server_common: smbXsrv_session_logoff_all() failed (NT_STATUS_NOT_FOUND) - triggering cleanup
[2016/11/02 21:14:16.450575,  0, pid=11314] ../source3/lib/util.c:789(smb_panic_s3)
  PANIC (pid 11314): smbXsrv_session_logoff_all failed
[2016/11/02 21:14:16.451097,  0, pid=11314] ../source3/lib/util.c:900(log_stack_trace)
  BACKTRACE: 23 stack frames:
   #0 /usr/lib/x86_64-linux-gnu/libsmbconf.so.0(log_stack_trace+0x1a) [0x7f43701974da]
   #1 /usr/lib/x86_64-linux-gnu/libsmbconf.so.0(smb_panic_s3+0x20) [0x7f43701975b0]
   #2 /usr/lib/x86_64-linux-gnu/libsamba-util.so.0(smb_panic+0x2f) [0x7f43722a6b9f]
   #3 /usr/lib/x86_64-linux-gnu/samba/libsmbd-base.so.0(+0x178168) [0x7f4371ec0168]
   #4 /usr/lib/x86_64-linux-gnu/samba/libsmbd-base.so.0(+0x17848e) [0x7f4371ec048e]
   #5 /usr/lib/x86_64-linux-gnu/samba/libsmbd-shim.so.0(exit_server_cleanly+0x12) [0x7f436fb56d42]
   #6 /usr/lib/x86_64-linux-gnu/samba/libsmbd-base.so.0(smbd_server_connection_terminate_ex+0x28) [0x7f4371e9df08]
   #7 /usr/lib/x86_64-linux-gnu/samba/libsmbd-base.so.0(+0x15cf0b) [0x7f4371ea4f0b]
   #8 /usr/lib/x86_64-linux-gnu/libtevent.so.0(_tevent_req_error+0x22) [0x7f436ebd5a42]
   #9 /usr/lib/x86_64-linux-gnu/libtevent.so.0(tevent_common_loop_immediate+0xe2) [0x7f436ebd5022]
   #10 /usr/lib/x86_64-linux-gnu/libsmbconf.so.0(run_events_poll+0x48) [0x7f43701ad4f8]
   #11 /usr/lib/x86_64-linux-gnu/libsmbconf.so.0(+0x3880b) [0x7f43701ad80b]
   #12 /usr/lib/x86_64-linux-gnu/libtevent.so.0(_tevent_loop_once+0x9d) [0x7f436ebd476d]
   #13 /usr/lib/x86_64-linux-gnu/libtevent.so.0(tevent_common_loop_wait+0x1b) [0x7f436ebd492b]
   #14 /usr/lib/x86_64-linux-gnu/samba/libsmbd-base.so.0(smbd_process+0x715) [0x7f4371e8f065]
   #15 /usr/sbin/smbd(+0xa006) [0x558b55eb3006]
   #16 /usr/lib/x86_64-linux-gnu/libsmbconf.so.0(run_events_poll+0x187) [0x7f43701ad637]
   #17 /usr/lib/x86_64-linux-gnu/libsmbconf.so.0(+0x388b9) [0x7f43701ad8b9]
   #18 /usr/lib/x86_64-linux-gnu/libtevent.so.0(_tevent_loop_once+0x9d) [0x7f436ebd476d]
   #19 /usr/lib/x86_64-linux-gnu/libtevent.so.0(tevent_common_loop_wait+0x1b) [0x7f436ebd492b]
   #20 /usr/sbin/smbd(main+0x15d6) [0x558b55eb0fa6]
   #21 /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xfd) [0x7f436e861ead]
   #22 /usr/sbin/smbd(+0x8375) [0x558b55eb1375]
[2016/11/02 21:14:16.451153,  0, pid=11314] ../source3/lib/dumpcore.c:318(dump_core)
  dumping core in /var/log/samba/cores/smbd
[2016/11/02 21:14:16.485389,  1, pid=3621] ../source3/smbd/server.c:486(remove_child_pid)
  Scheduled cleanup of brl and lock database after unclean shutdown
[2016/11/02 21:14:16.549036,  0, pid=11321] ../source3/auth/pampass.c:89(smb_pam_error_handler)
  smb_pam_error_handler: PAM: session setup failed : User not known to the underlying authentication module
[2016/11/02 21:14:16.550646,  1, pid=11321] ../source3/smbd/session.c:70(session_claim)
  pam_session rejected the session for ZENSIERTESCHULE+exam-Benutzer.Name [smb/289005258]
[2016/11/02 21:14:16.550666,  1, pid=11321] ../source3/smbd/smb2_sesssetup.c:450(smbd_smb2_auth_generic_return)
  smb2: Failed to claim session for vuid=289005258
[2016/11/02 21:14:16.602271,  0, pid=11318] ../source3/auth/pampass.c:89(smb_pam_error_handler)
  smb_pam_error_handler: PAM: session setup failed : User not known to the underlying authentication module
[2016/11/02 21:14:16.603062,  1, pid=11318] ../source3/smbd/session.c:70(session_claim)
  pam_session rejected the session for ZENSIERTESCHULE+exam-Benutzer.Name [smb/289005258]
[2016/11/02 21:14:16.603079,  1, pid=11318] ../source3/smbd/smb2_sesssetup.c:450(smbd_smb2_auth_generic_return)
  smb2: Failed to claim session for vuid=289005258
[2016/11/02 21:14:16.603193,  0, pid=11318] ../source3/smbd/smbXsrv_session.c:1553(smbXsrv_session_logoff)
  smbXsrv_session_logoff(0x1139deca): failed to delete global key '1139DECA': NT_STATUS_NOT_FOUND
[2016/11/02 21:14:16.606397,  0, pid=11318] ../source3/smbd/smbXsrv_session.c:1662(smbXsrv_session_logoff_all)
  smbXsrv_session_logoff_all: count[1] errors[1] first[NT_STATUS_NOT_FOUND]
[2016/11/02 21:14:16.606419,  0, pid=11318] ../source3/smbd/server_exit.c:159(exit_server_common)
  Server exit (NT_STATUS_CONNECTION_DISCONNECTED)
[2016/11/02 21:14:16.606427,  0, pid=11318] ../source3/smbd/server_exit.c:162(exit_server_common)
  exit_server_common: smbXsrv_session_logoff_all() failed (NT_STATUS_NOT_FOUND) - triggering cleanup
[2016/11/02 21:14:16.607122,  0, pid=11318] ../source3/lib/util.c:789(smb_panic_s3)
  PANIC (pid 11318): smbXsrv_session_logoff_all failed
[2016/11/02 21:14:16.607759,  0, pid=11318] ../source3/lib/util.c:900(log_stack_trace)
  BACKTRACE: 23 stack frames:
   #0 /usr/lib/x86_64-linux-gnu/libsmbconf.so.0(log_stack_trace+0x1a) [0x7f43701974da]
   #1 /usr/lib/x86_64-linux-gnu/libsmbconf.so.0(smb_panic_s3+0x20) [0x7f43701975b0]
   #2 /usr/lib/x86_64-linux-gnu/libsamba-util.so.0(smb_panic+0x2f) [0x7f43722a6b9f]
   #3 /usr/lib/x86_64-linux-gnu/samba/libsmbd-base.so.0(+0x178168) [0x7f4371ec0168]
   #4 /usr/lib/x86_64-linux-gnu/samba/libsmbd-base.so.0(+0x17848e) [0x7f4371ec048e]
   #5 /usr/lib/x86_64-linux-gnu/samba/libsmbd-shim.so.0(exit_server_cleanly+0x12) [0x7f436fb56d42]
   #6 /usr/lib/x86_64-linux-gnu/samba/libsmbd-base.so.0(smbd_server_connection_terminate_ex+0x28) [0x7f4371e9df08]
   #7 /usr/lib/x86_64-linux-gnu/samba/libsmbd-base.so.0(+0x15cf0b) [0x7f4371ea4f0b]
   #8 /usr/lib/x86_64-linux-gnu/libtevent.so.0(_tevent_req_error+0x22) [0x7f436ebd5a42]
   #9 /usr/lib/x86_64-linux-gnu/libtevent.so.0(tevent_common_loop_immediate+0xe2) [0x7f436ebd5022]
   #10 /usr/lib/x86_64-linux-gnu/libsmbconf.so.0(run_events_poll+0x48) [0x7f43701ad4f8]
   #11 /usr/lib/x86_64-linux-gnu/libsmbconf.so.0(+0x3880b) [0x7f43701ad80b]
   #12 /usr/lib/x86_64-linux-gnu/libtevent.so.0(_tevent_loop_once+0x9d) [0x7f436ebd476d]
   #13 /usr/lib/x86_64-linux-gnu/libtevent.so.0(tevent_common_loop_wait+0x1b) [0x7f436ebd492b]
   #14 /usr/lib/x86_64-linux-gnu/samba/libsmbd-base.so.0(smbd_process+0x715) [0x7f4371e8f065]
   #15 /usr/sbin/smbd(+0xa006) [0x558b55eb3006]
   #16 /usr/lib/x86_64-linux-gnu/libsmbconf.so.0(run_events_poll+0x187) [0x7f43701ad637]
   #17 /usr/lib/x86_64-linux-gnu/libsmbconf.so.0(+0x388b9) [0x7f43701ad8b9]
   #18 /usr/lib/x86_64-linux-gnu/libtevent.so.0(_tevent_loop_once+0x9d) [0x7f436ebd476d]
   #19 /usr/lib/x86_64-linux-gnu/libtevent.so.0(tevent_common_loop_wait+0x1b) [0x7f436ebd492b]
   #20 /usr/sbin/smbd(main+0x15d6) [0x558b55eb0fa6]
   #21 /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xfd) [0x7f436e861ead]
   #22 /usr/sbin/smbd(+0x8375) [0x558b55eb1375]
[2016/11/02 21:14:16.607814,  0, pid=11318] ../source3/lib/dumpcore.c:318(dump_core)
  dumping core in /var/log/samba/cores/smbd
[2016/11/02 21:14:16.711682,  0, pid=11326] ../source3/auth/pampass.c:89(smb_pam_error_handler)
  smb_pam_error_handler: PAM: session setup failed : User not known to the underlying authentication module
[2016/11/02 21:14:16.713233,  1, pid=11326] ../source3/smbd/session.c:70(session_claim)
  pam_session rejected the session for ZENSIERTESCHULE+exam-Benutzer.Name [smb/309685328]
[2016/11/02 21:14:16.713252,  1, pid=11326] ../source3/smbd/smb2_sesssetup.c:450(smbd_smb2_auth_generic_return)
  smb2: Failed to claim session for vuid=309685328
[2016/11/02 21:14:16.764996,  0, pid=11323] ../source3/auth/pampass.c:89(smb_pam_error_handler)
  smb_pam_error_handler: PAM: session setup failed : User not known to the underlying authentication module
[2016/11/02 21:14:16.765706,  1, pid=11323] ../source3/smbd/session.c:70(session_claim)
  pam_session rejected the session for ZENSIERTESCHULE+exam-Benutzer.Name [smb/309685328]
[2016/11/02 21:14:16.765720,  1, pid=11323] ../source3/smbd/smb2_sesssetup.c:450(smbd_smb2_auth_generic_return)
  smb2: Failed to claim session for vuid=309685328
[2016/11/02 21:14:16.765826,  0, pid=11323] ../source3/smbd/smbXsrv_session.c:1553(smbXsrv_session_logoff)
  smbXsrv_session_logoff(0x12756c50): failed to delete global key '12756C50': NT_STATUS_NOT_FOUND
[2016/11/02 21:14:16.768710,  0, pid=11323] ../source3/smbd/smbXsrv_session.c:1662(smbXsrv_session_logoff_all)
  smbXsrv_session_logoff_all: count[1] errors[1] first[NT_STATUS_NOT_FOUND]
[2016/11/02 21:14:16.768725,  0, pid=11323] ../source3/smbd/server_exit.c:159(exit_server_common)
  Server exit (NT_STATUS_CONNECTION_DISCONNECTED)
[2016/11/02 21:14:16.768731,  0, pid=11323] ../source3/smbd/server_exit.c:162(exit_server_common)
  exit_server_common: smbXsrv_session_logoff_all() failed (NT_STATUS_NOT_FOUND) - triggering cleanup
[2016/11/02 21:14:16.769365,  0, pid=11323] ../source3/lib/util.c:789(smb_panic_s3)
  PANIC (pid 11323): smbXsrv_session_logoff_all failed
[2016/11/02 21:14:16.769901,  0, pid=11323] ../source3/lib/util.c:900(log_stack_trace)
  BACKTRACE: 23 stack frames:
   #0 /usr/lib/x86_64-linux-gnu/libsmbconf.so.0(log_stack_trace+0x1a) [0x7f43701974da]
   #1 /usr/lib/x86_64-linux-gnu/libsmbconf.so.0(smb_panic_s3+0x20) [0x7f43701975b0]
   #2 /usr/lib/x86_64-linux-gnu/libsamba-util.so.0(smb_panic+0x2f) [0x7f43722a6b9f]
   #3 /usr/lib/x86_64-linux-gnu/samba/libsmbd-base.so.0(+0x178168) [0x7f4371ec0168]
   #4 /usr/lib/x86_64-linux-gnu/samba/libsmbd-base.so.0(+0x17848e) [0x7f4371ec048e]
   #5 /usr/lib/x86_64-linux-gnu/samba/libsmbd-shim.so.0(exit_server_cleanly+0x12) [0x7f436fb56d42]
   #6 /usr/lib/x86_64-linux-gnu/samba/libsmbd-base.so.0(smbd_server_connection_terminate_ex+0x28) [0x7f4371e9df08]
   #7 /usr/lib/x86_64-linux-gnu/samba/libsmbd-base.so.0(+0x15cf0b) [0x7f4371ea4f0b]
   #8 /usr/lib/x86_64-linux-gnu/libtevent.so.0(_tevent_req_error+0x22) [0x7f436ebd5a42]
   #9 /usr/lib/x86_64-linux-gnu/libtevent.so.0(tevent_common_loop_immediate+0xe2) [0x7f436ebd5022]
   #10 /usr/lib/x86_64-linux-gnu/libsmbconf.so.0(run_events_poll+0x48) [0x7f43701ad4f8]
   #11 /usr/lib/x86_64-linux-gnu/libsmbconf.so.0(+0x3880b) [0x7f43701ad80b]
   #12 /usr/lib/x86_64-linux-gnu/libtevent.so.0(_tevent_loop_once+0x9d) [0x7f436ebd476d]
   #13 /usr/lib/x86_64-linux-gnu/libtevent.so.0(tevent_common_loop_wait+0x1b) [0x7f436ebd492b]
   #14 /usr/lib/x86_64-linux-gnu/samba/libsmbd-base.so.0(smbd_process+0x715) [0x7f4371e8f065]
   #15 /usr/sbin/smbd(+0xa006) [0x558b55eb3006]
   #16 /usr/lib/x86_64-linux-gnu/libsmbconf.so.0(run_events_poll+0x187) [0x7f43701ad637]
   #17 /usr/lib/x86_64-linux-gnu/libsmbconf.so.0(+0x388b9) [0x7f43701ad8b9]
   #18 /usr/lib/x86_64-linux-gnu/libtevent.so.0(_tevent_loop_once+0x9d) [0x7f436ebd476d]
   #19 /usr/lib/x86_64-linux-gnu/libtevent.so.0(tevent_common_loop_wait+0x1b) [0x7f436ebd492b]
   #20 /usr/sbin/smbd(main+0x15d6) [0x558b55eb0fa6]
   #21 /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xfd) [0x7f436e861ead]
   #22 /usr/sbin/smbd(+0x8375) [0x558b55eb1375]
[2016/11/02 21:14:16.769957,  0, pid=11323] ../source3/lib/dumpcore.c:318(dump_core)
  dumping core in /var/log/samba/cores/smbd
[2016/11/02 21:14:16.870607,  0, pid=11331] ../source3/auth/pampass.c:89(smb_pam_error_handler)
  smb_pam_error_handler: PAM: session setup failed : User not known to the underlying authentication module
[2016/11/02 21:14:16.872182,  1, pid=11331] ../source3/smbd/session.c:70(session_claim)
  pam_session rejected the session for ZENSIERTESCHULE+exam-Benutzer.Name [smb/3963335021]
[2016/11/02 21:14:16.872202,  1, pid=11331] ../source3/smbd/smb2_sesssetup.c:450(smbd_smb2_auth_generic_return)
  smb2: Failed to claim session for vuid=3963335021
[2016/11/02 21:14:16.925813,  0, pid=11328] ../source3/auth/pampass.c:89(smb_pam_error_handler)
  smb_pam_error_handler: PAM: session setup failed : User not known to the underlying authentication module
[2016/11/02 21:14:16.926598,  1, pid=11328] ../source3/smbd/session.c:70(session_claim)
  pam_session rejected the session for ZENSIERTESCHULE+exam-Benutzer.Name [smb/3963335021]
[2016/11/02 21:14:16.926614,  1, pid=11328] ../source3/smbd/smb2_sesssetup.c:450(smbd_smb2_auth_generic_return)
  smb2: Failed to claim session for vuid=3963335021
[2016/11/02 21:14:16.926743,  0, pid=11328] ../source3/smbd/smbXsrv_session.c:1553(smbXsrv_session_logoff)
  smbXsrv_session_logoff(0xec3bb16d): failed to delete global key 'EC3BB16D': NT_STATUS_NOT_FOUND
[2016/11/02 21:14:16.929797,  0, pid=11328] ../source3/smbd/smbXsrv_session.c:1662(smbXsrv_session_logoff_all)
  smbXsrv_session_logoff_all: count[1] errors[1] first[NT_STATUS_NOT_FOUND]
[2016/11/02 21:14:16.929813,  0, pid=11328] ../source3/smbd/server_exit.c:159(exit_server_common)
  Server exit (NT_STATUS_CONNECTION_DISCONNECTED)
[2016/11/02 21:14:16.929828,  0, pid=11328] ../source3/smbd/server_exit.c:162(exit_server_common)
  exit_server_common: smbXsrv_session_logoff_all() failed (NT_STATUS_NOT_FOUND) - triggering cleanup
[2016/11/02 21:14:16.930534,  0, pid=11328] ../source3/lib/util.c:789(smb_panic_s3)
  PANIC (pid 11328): smbXsrv_session_logoff_all failed
[2016/11/02 21:14:16.931205,  0, pid=11328] ../source3/lib/util.c:900(log_stack_trace)
  BACKTRACE: 23 stack frames:
   #0 /usr/lib/x86_64-linux-gnu/libsmbconf.so.0(log_stack_trace+0x1a) [0x7f43701974da]
   #1 /usr/lib/x86_64-linux-gnu/libsmbconf.so.0(smb_panic_s3+0x20) [0x7f43701975b0]
   #2 /usr/lib/x86_64-linux-gnu/libsamba-util.so.0(smb_panic+0x2f) [0x7f43722a6b9f]
   #3 /usr/lib/x86_64-linux-gnu/samba/libsmbd-base.so.0(+0x178168) [0x7f4371ec0168]
   #4 /usr/lib/x86_64-linux-gnu/samba/libsmbd-base.so.0(+0x17848e) [0x7f4371ec048e]
   #5 /usr/lib/x86_64-linux-gnu/samba/libsmbd-shim.so.0(exit_server_cleanly+0x12) [0x7f436fb56d42]
   #6 /usr/lib/x86_64-linux-gnu/samba/libsmbd-base.so.0(smbd_server_connection_terminate_ex+0x28) [0x7f4371e9df08]
   #7 /usr/lib/x86_64-linux-gnu/samba/libsmbd-base.so.0(+0x15cf0b) [0x7f4371ea4f0b]
   #8 /usr/lib/x86_64-linux-gnu/libtevent.so.0(_tevent_req_error+0x22) [0x7f436ebd5a42]
   #9 /usr/lib/x86_64-linux-gnu/libtevent.so.0(tevent_common_loop_immediate+0xe2) [0x7f436ebd5022]
   #10 /usr/lib/x86_64-linux-gnu/libsmbconf.so.0(run_events_poll+0x48) [0x7f43701ad4f8]
   #11 /usr/lib/x86_64-linux-gnu/libsmbconf.so.0(+0x3880b) [0x7f43701ad80b]
   #12 /usr/lib/x86_64-linux-gnu/libtevent.so.0(_tevent_loop_once+0x9d) [0x7f436ebd476d]
   #13 /usr/lib/x86_64-linux-gnu/libtevent.so.0(tevent_common_loop_wait+0x1b) [0x7f436ebd492b]
   #14 /usr/lib/x86_64-linux-gnu/samba/libsmbd-base.so.0(smbd_process+0x715) [0x7f4371e8f065]
   #15 /usr/sbin/smbd(+0xa006) [0x558b55eb3006]
   #16 /usr/lib/x86_64-linux-gnu/libsmbconf.so.0(run_events_poll+0x187) [0x7f43701ad637]
   #17 /usr/lib/x86_64-linux-gnu/libsmbconf.so.0(+0x388b9) [0x7f43701ad8b9]
   #18 /usr/lib/x86_64-linux-gnu/libtevent.so.0(_tevent_loop_once+0x9d) [0x7f436ebd476d]
   #19 /usr/lib/x86_64-linux-gnu/libtevent.so.0(tevent_common_loop_wait+0x1b) [0x7f436ebd492b]
   #20 /usr/sbin/smbd(main+0x15d6) [0x558b55eb0fa6]
   #21 /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xfd) [0x7f436e861ead]
   #22 /usr/sbin/smbd(+0x8375) [0x558b55eb1375]
[2016/11/02 21:14:16.931262,  0, pid=11328] ../source3/lib/dumpcore.c:318(dump_core)
  dumping core in /var/log/samba/cores/smbd
[2016/11/02 21:14:17.027404,  0, pid=11336] ../source3/auth/pampass.c:89(smb_pam_error_handler)
  smb_pam_error_handler: PAM: session setup failed : User not known to the underlying authentication module
[2016/11/02 21:14:17.028992,  1, pid=11336] ../source3/smbd/session.c:70(session_claim)
  pam_session rejected the session for ZENSIERTESCHULE+exam-Benutzer.Name [smb/3017206813]
[2016/11/02 21:14:17.029011,  1, pid=11336] ../source3/smbd/smb2_sesssetup.c:450(smbd_smb2_auth_generic_return)
  smb2: Failed to claim session for vuid=3017206813
[2016/11/02 21:14:17.080796,  0, pid=11333] ../source3/auth/pampass.c:89(smb_pam_error_handler)
  smb_pam_error_handler: PAM: session setup failed : User not known to the underlying authentication module
[2016/11/02 21:14:17.081603,  1, pid=11333] ../source3/smbd/session.c:70(session_claim)
  pam_session rejected the session for ZENSIERTESCHULE+exam-Benutzer.Name [smb/3017206813]
[2016/11/02 21:14:17.081619,  1, pid=11333] ../source3/smbd/smb2_sesssetup.c:450(smbd_smb2_auth_generic_return)
  smb2: Failed to claim session for vuid=3017206813
[2016/11/02 21:14:17.081793,  0, pid=11333] ../source3/smbd/smbXsrv_session.c:1553(smbXsrv_session_logoff)
  smbXsrv_session_logoff(0xb3d6ec1d): failed to delete global key 'B3D6EC1D': NT_STATUS_NOT_FOUND
[2016/11/02 21:14:17.085056,  0, pid=11333] ../source3/smbd/smbXsrv_session.c:1662(smbXsrv_session_logoff_all)
  smbXsrv_session_logoff_all: count[1] errors[1] first[NT_STATUS_NOT_FOUND]
[2016/11/02 21:14:17.085072,  0, pid=11333] ../source3/smbd/server_exit.c:159(exit_server_common)
  Server exit (NT_STATUS_CONNECTION_DISCONNECTED)
[2016/11/02 21:14:17.085086,  0, pid=11333] ../source3/smbd/server_exit.c:162(exit_server_common)
  exit_server_common: smbXsrv_session_logoff_all() failed (NT_STATUS_NOT_FOUND) - triggering cleanup
[2016/11/02 21:14:17.085778,  0, pid=11333] ../source3/lib/util.c:789(smb_panic_s3)
  PANIC (pid 11333): smbXsrv_session_logoff_all failed
[2016/11/02 21:14:17.086351,  0, pid=11333] ../source3/lib/util.c:900(log_stack_trace)
  BACKTRACE: 23 stack frames:
   #0 /usr/lib/x86_64-linux-gnu/libsmbconf.so.0(log_stack_trace+0x1a) [0x7f43701974da]
   #1 /usr/lib/x86_64-linux-gnu/libsmbconf.so.0(smb_panic_s3+0x20) [0x7f43701975b0]
   #2 /usr/lib/x86_64-linux-gnu/libsamba-util.so.0(smb_panic+0x2f) [0x7f43722a6b9f]
   #3 /usr/lib/x86_64-linux-gnu/samba/libsmbd-base.so.0(+0x178168) [0x7f4371ec0168]
   #4 /usr/lib/x86_64-linux-gnu/samba/libsmbd-base.so.0(+0x17848e) [0x7f4371ec048e]
   #5 /usr/lib/x86_64-linux-gnu/samba/libsmbd-shim.so.0(exit_server_cleanly+0x12) [0x7f436fb56d42]
   #6 /usr/lib/x86_64-linux-gnu/samba/libsmbd-base.so.0(smbd_server_connection_terminate_ex+0x28) [0x7f4371e9df08]
   #7 /usr/lib/x86_64-linux-gnu/samba/libsmbd-base.so.0(+0x15cf0b) [0x7f4371ea4f0b]
   #8 /usr/lib/x86_64-linux-gnu/libtevent.so.0(_tevent_req_error+0x22) [0x7f436ebd5a42]
   #9 /usr/lib/x86_64-linux-gnu/libtevent.so.0(tevent_common_loop_immediate+0xe2) [0x7f436ebd5022]
   #10 /usr/lib/x86_64-linux-gnu/libsmbconf.so.0(run_events_poll+0x48) [0x7f43701ad4f8]
   #11 /usr/lib/x86_64-linux-gnu/libsmbconf.so.0(+0x3880b) [0x7f43701ad80b]
   #12 /usr/lib/x86_64-linux-gnu/libtevent.so.0(_tevent_loop_once+0x9d) [0x7f436ebd476d]
   #13 /usr/lib/x86_64-linux-gnu/libtevent.so.0(tevent_common_loop_wait+0x1b) [0x7f436ebd492b]
   #14 /usr/lib/x86_64-linux-gnu/samba/libsmbd-base.so.0(smbd_process+0x715) [0x7f4371e8f065]
   #15 /usr/sbin/smbd(+0xa006) [0x558b55eb3006]
   #16 /usr/lib/x86_64-linux-gnu/libsmbconf.so.0(run_events_poll+0x187) [0x7f43701ad637]
   #17 /usr/lib/x86_64-linux-gnu/libsmbconf.so.0(+0x388b9) [0x7f43701ad8b9]
   #18 /usr/lib/x86_64-linux-gnu/libtevent.so.0(_tevent_loop_once+0x9d) [0x7f436ebd476d]
   #19 /usr/lib/x86_64-linux-gnu/libtevent.so.0(tevent_common_loop_wait+0x1b) [0x7f436ebd492b]
   #20 /usr/sbin/smbd(main+0x15d6) [0x558b55eb0fa6]
   #21 /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xfd) [0x7f436e861ead]
   #22 /usr/sbin/smbd(+0x8375) [0x558b55eb1375]
[2016/11/02 21:14:17.086419,  0, pid=11333] ../source3/lib/dumpcore.c:318(dump_core)
  dumping core in /var/log/samba/cores/smbd
[2016/11/02 21:14:36.486306,  1, pid=3621] ../source3/smbd/server.c:429(cleanup_timeout_fn)
  Cleaning up brl and lock database after unclean shutdown
Comment 1 Florian Best univentionstaff 2016-12-01 12:34:18 CET 
Could it be that the exam user was removed but still logged in via windows and tries to access its share?
Comment 2 Florian Best univentionstaff 2016-12-01 12:55:58 CET 
# ucr search --brief ^version
version/erratalevel: 327
version/patchlevel: 4
version/releasename: Vahr
version/version: 4.1
Comment 4 Arvid Requate univentionstaff 2016-12-01 14:48:04 CET 
The actual panic looks like the one reported on Bug 39802. So the Posix account is not present at the moment of SMB logon. The reason for this might differ from the situation in Bug 39802. The problem of the coredump looks identical to me.

So in the UCS@school context this might indicate an issue with regards to the handling of exam users.
Comment 5 Arvid Requate univentionstaff 2017-04-28 12:46:31 CEST 
What's the impact?
Comment 6 Sönke Schwardt-Krummrich univentionstaff 2019-02-05 21:43:36 CET 
This issue has been filled against UCS@school 4.1 (R2). The maintenance with
bug and security fixes for UCS@school 4.1 (R2) has ended on 5th of April 2018.

Customers still on UCS 4.1 are encouraged to update to UCS 4.3 (or later). 
Please contact your partner or Univention for any questions.

If this issue still occurs in newer UCS versions, please use "Clone this bug"
or simply reopen the issue. In this case please provide detailed information on
how this issue is affecting you.
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