[Samba] samba-4.18.6: keytab issues

Wed Sep 27 11:38:43 UTC 2023

Found this in the journal of smbd:

Sep 17 21:28:12 pre01svdeb01 smbd[1378242]: [2023/09/17 21:28:12.182549, 
  0] ../../source3/smbd/server.c:1746(main)
Sep 17 21:28:12 pre01svdeb01 smbd[1378242]:   smbd version 4.18.6-Debian 
started.
Sep 17 21:28:12 pre01svdeb01 smbd[1378242]:   Copyright Andrew Tridgell 
and the Samba Team 1992-2023
Sep 17 21:28:12 pre01svdeb01 systemd[1]: Started smbd.service - Samba 
SMB Daemon.
Sep 19 06:17:34 pre01svdeb01 smbd[1378756]: [2023/09/19 06:17:34.034325, 
  0] ../../source3/smbd/fd_handle.c:39(fd_handle_destructor)
Sep 19 06:17:34 pre01svdeb01 smbd[1378756]:   PANIC: assert failed at 
../../source3/smbd/fd_handle.c(39): (fh->fd == -1) || (fh->fd == AT_FDCWD)
Sep 19 06:17:34 pre01svdeb01 smbd[1378756]: [2023/09/19 06:17:34.034420, 
  0] ../../lib/util/fault.c:173(smb_panic_log)
Sep 19 06:17:34 pre01svdeb01 smbd[1378756]: 
===============================================================
Sep 19 06:17:34 pre01svdeb01 smbd[1378756]: [2023/09/19 06:17:34.034509, 
  0] ../../lib/util/fault.c:174(smb_panic_log)
Sep 19 06:17:34 pre01svdeb01 smbd[1378756]:   INTERNAL ERROR: assert 
failed: (fh->fd == -1) || (fh->fd == AT_FDCWD) in pid 1378756 
(4.18.6-Debian)
Sep 19 06:17:34 pre01svdeb01 smbd[1378756]: [2023/09/19 06:17:34.034610, 
  0] ../../lib/util/fault.c:178(smb_panic_log)
Sep 19 06:17:34 pre01svdeb01 smbd[1378756]:   If you are running a 
recent Samba version, and if you think this problem is not yet fixed in 
the latest versions, please consider reporting this bug, see 
https://wiki.samba.org/index.php/Bug_Reporting
Sep 19 06:17:34 pre01svdeb01 smbd[1378756]: [2023/09/19 06:17:34.034682, 
  0] ../../lib/util/fault.c:183(smb_panic_log)
Sep 19 06:17:34 pre01svdeb01 smbd[1378756]: 
===============================================================
Sep 19 06:17:34 pre01svdeb01 smbd[1378756]: [2023/09/19 06:17:34.034742, 
  0] ../../lib/util/fault.c:184(smb_panic_log)
Sep 19 06:17:34 pre01svdeb01 smbd[1378756]:   PANIC (pid 1378756): 
assert failed: (fh->fd == -1) || (fh->fd == AT_FDCWD) in 4.18.6-Debian
Sep 19 06:17:34 pre01svdeb01 smbd[1378756]: [2023/09/19 06:17:34.035794, 
  0] ../../lib/util/fault.c:292(log_stack_trace)
Sep 19 06:17:34 pre01svdeb01 smbd[1378756]:   BACKTRACE: 27 stack frames:
Sep 19 06:17:34 pre01svdeb01 smbd[1378756]:    #0 
/usr/lib/x86_64-linux-gnu/samba/libgenrand-samba4.so.0(log_stack_trace+0x2e) 
[0x7f3284aa455e]
Sep 19 06:17:34 pre01svdeb01 smbd[1378756]:    #1 
/usr/lib/x86_64-linux-gnu/samba/libgenrand-samba4.so.0(smb_panic+0x9) 
[0x7f3284aa47b9]
Sep 19 06:17:34 pre01svdeb01 smbd[1378756]:    #2 
/usr/lib/x86_64-linux-gnu/samba/libsmbd-base-samba4.so.0(+0x506eb) 
[0x7f3284e876eb]
Sep 19 06:17:34 pre01svdeb01 smbd[1378756]:    #3 
/lib/x86_64-linux-gnu/libtalloc.so.2(+0x47af) [0x7f3284a477af]
Sep 19 06:17:34 pre01svdeb01 smbd[1378756]:    #4 
/usr/lib/x86_64-linux-gnu/samba/libsmbd-base-samba4.so.0(file_free+0xd6) 
[0x7f3284e8d456]
Sep 19 06:17:34 pre01svdeb01 smbd[1378756]:    #5 
/usr/lib/x86_64-linux-gnu/samba/libsmbd-base-samba4.so.0(vfs_default_durable_reconnect+0x11c1) 
[0x7f3284f134f1]
Sep 19 06:17:34 pre01svdeb01 smbd[1378756]:    #6 
/usr/lib/x86_64-linux-gnu/samba/libsmbd-base-samba4.so.0(smbd_smb2_request_process_create+0x11d8) 
[0x7f3284ef3dc8]
Sep 19 06:17:34 pre01svdeb01 smbd[1378756]:    #7 
/usr/lib/x86_64-linux-gnu/samba/libsmbd-base-samba4.so.0(smbd_smb2_request_dispatch+0x1a8a) 
[0x7f3284ee91da]
Sep 19 06:17:34 pre01svdeb01 smbd[1378756]:    #8 
/usr/lib/x86_64-linux-gnu/samba/libsmbd-base-samba4.so.0(+0xb33b1) 
[0x7f3284eea3b1]
Sep 19 06:17:34 pre01svdeb01 smbd[1378756]:    #9 
/lib/x86_64-linux-gnu/libtevent.so.0(tevent_common_invoke_fd_handler+0x91) 
[0x7f3284a348c1]
Sep 19 06:17:34 pre01svdeb01 smbd[1378756]:    #10 
/lib/x86_64-linux-gnu/libtevent.so.0(+0xee07) [0x7f3284a3ae07]
Sep 19 06:17:34 pre01svdeb01 smbd[1378756]:    #11 
/lib/x86_64-linux-gnu/libtevent.so.0(+0xcef7) [0x7f3284a38ef7]
Sep 19 06:17:34 pre01svdeb01 smbd[1378756]:    #12 
/lib/x86_64-linux-gnu/libtevent.so.0(_tevent_loop_once+0x91) 
[0x7f3284a33ba1]
Sep 19 06:17:34 pre01svdeb01 smbd[1378756]:    #13 
/lib/x86_64-linux-gnu/libtevent.so.0(tevent_common_loop_wait+0x1b) 
[0x7f3284a33e7b]
Sep 19 06:17:34 pre01svdeb01 smbd[1378756]:    #14 
/lib/x86_64-linux-gnu/libtevent.so.0(+0xce97) [0x7f3284a38e97]
Sep 19 06:17:34 pre01svdeb01 smbd[1378756]:    #15 
/usr/lib/x86_64-linux-gnu/samba/libsmbd-base-samba4.so.0(smbd_process+0x82f) 
[0x7f3284ed71df]
Sep 19 06:17:34 pre01svdeb01 smbd[1378756]:    #16 smbd: client 
[192.168.16.173](+0x9e2e) [0x5624a7a51e2e]
Sep 19 06:17:34 pre01svdeb01 smbd[1378756]:    #17 
/lib/x86_64-linux-gnu/libtevent.so.0(tevent_common_invoke_fd_handler+0x91) 
[0x7f3284a348c1]
Sep 19 06:17:34 pre01svdeb01 smbd[1378756]:    #18 
/lib/x86_64-linux-gnu/libtevent.so.0(+0xee07) [0x7f3284a3ae07]
Sep 19 06:17:34 pre01svdeb01 smbd[1378756]:    #19 
/lib/x86_64-linux-gnu/libtevent.so.0(+0xcef7) [0x7f3284a38ef7]
Sep 19 06:17:34 pre01svdeb01 smbd[1378756]:    #20 
/lib/x86_64-linux-gnu/libtevent.so.0(_tevent_loop_once+0x91) 
[0x7f3284a33ba1]
Sep 19 06:17:34 pre01svdeb01 smbd[1378756]:    #21 
/lib/x86_64-linux-gnu/libtevent.so.0(tevent_common_loop_wait+0x1b) 
[0x7f3284a33e7b]
Sep 19 06:17:34 pre01svdeb01 smbd[1378756]:    #22 
/lib/x86_64-linux-gnu/libtevent.so.0(+0xce97) [0x7f3284a38e97]
Sep 19 06:17:34 pre01svdeb01 smbd[1378756]:    #23 smbd: client 
[192.168.16.173](main+0x149b) [0x5624a7a4f29b]
Sep 19 06:17:34 pre01svdeb01 smbd[1378756]:    #24 
/lib/x86_64-linux-gnu/libc.so.6(+0x271ca) [0x7f32848721ca]
Sep 19 06:17:34 pre01svdeb01 smbd[1378756]:    #25 
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0x85) [0x7f3284872285]
Sep 19 06:17:34 pre01svdeb01 smbd[1378756]:    #26 smbd: client 
[192.168.16.173](_start+0x21) [0x5624a7a4fb81]
Sep 19 06:17:34 pre01svdeb01 smbd[1378756]: [2023/09/19 06:17:34.036893, 
  0] ../../source3/lib/dumpcore.c:315(dump_core)
Sep 19 06:17:34 pre01svdeb01 smbd[1378756]:   dumping core in 
/var/log/samba/cores/smbd

although that is ~1 week old

The issues with the access are there for months as far I am told. So 
before 4.18

Additional fact:

the software uses some ISAM database ... there might be locking issues.

Some years ago I already did *something* related to this. But I don't 
remember.