[Samba] Very strange issue copying only certain files to a share

Matt Pruett entelin at gmail.com
Fri Jul 7 21:46:30 UTC 2023 

I've been troubleshooting this issue for over a week and am running out of
ideas.

Generally everything works fine. I can copy files into the share, create
and delete files and folders. However when copying *some* files from
windows specifically it will say "The destination already has a file named
"a"". A size 0 file by that name is then created. No files exist in the
folder when I test this.

1. Renaming the file has no effect, in this case I renamed a pdf I'm having
trouble with to the letter "a" with no extension.
2. Copying this file to a different windows system results in the same error
3. Renaming a different already working file to "a" and copying it into the
share *works*.
4. Copying the problem files into the share from linux over smb works.
5. I also tried an entirely fresh standalone install of windows which has
the same behavior, and also created a fresh test case with a simplified
smb.conf to help narrow down the issue as seen below.
6. I've tested with and without selinux enforcing, however I have not
gotten any selinux errors regardless, the share has been set to
"samba_share_t"

My test case is a fresh Fedora 38 server with Samba 4.18.4

==> smb.conf: <==
[global]
        workgroup = WORKGROUP
        security = user

        passdb backend = tdbsam
        disable netbios = yes

        printing = bsd
        printcap name = /dev/null
        load printers = no
        cups options = raw
        disable spoolss = yes

        log level = 3

#        restrict anonymous = 2
# I tried restrict anonymous = 2 following a thread about permission issues
related to anonymous access, but it didn't change the issue.

[test]
        path = /srv/test
        read only = no
        valid users = jaadmin

==> Dir permissions <==
$ ls -lZ /srv/
drwxr-xr-x. 2 jaadmin jaadmin unconfined_u:object_r:samba_share_t:s0 15 Jul
 7 16:00 test

==> The size 0 file created on a failed copy <==
# ls -lZ /srv/test/
-rwxr--r--. 1 jaadmin jaadmin system_u:object_r:samba_share_t:s0 0 Jul  7
16:38 a

==> log.smbd <==
[2023/07/07 16:38:16.793627,  3]
../../source3/smbd/smb2_trans2.c:2151(smbd_do_qfsinfo)
  smbd_do_qfsinfo: level = 1007
[2023/07/07 16:38:16.795140,  3]
../../source3/smbd/smb2_server.c:3962(smbd_smb2_request_error_ex)
  smbd_smb2_request_error_ex: smbd_smb2_request_error_ex: idx[1]
status[NT_STATUS_CANCELLED] || at ../../source3/smbd/smb2_notify.c:126
[2023/07/07 16:38:16.795705,  3]
../../source3/smbd/smb2_server.c:3962(smbd_smb2_request_error_ex)
  smbd_smb2_request_error_ex: smbd_smb2_request_error_ex: idx[1]
status[NT_STATUS_CANCELLED] || at ../../source3/smbd/smb2_notify.c:126
[2023/07/07 16:38:16.798528,  2] ../../source3/smbd/open.c:1678(open_file)
  jaadmin opened file a read=Yes write=Yes (numopen=3)
[2023/07/07 16:38:16.798643,  2]
../../source3/smbd/close.c:934(close_normal_file)
  jaadmin closed file a (numopen=2) NT_STATUS_OK
[2023/07/07 16:38:16.798660,  3]
../../source3/smbd/smb2_server.c:3962(smbd_smb2_request_error_ex)
  smbd_smb2_request_error_ex: smbd_smb2_request_error_ex: idx[1]
status[NT_STATUS_ACCESS_DENIED] || at ../../source3/smbd/smb2_create.c:340
[2023/07/07 16:38:16.799052,  3]
../../source3/smbd/smb2_server.c:3962(smbd_smb2_request_error_ex)
  smbd_smb2_request_error_ex: smbd_smb2_request_error_ex: idx[1]
status[NT_STATUS_OBJECT_NAME_COLLISION] || at
../../source3/smbd/smb2_create.c:340
[2023/07/07 16:38:16.799691,  3]
../../source3/smbd/smb2_server.c:3962(smbd_smb2_request_error_ex)
  smbd_smb2_request_error_ex: smbd_smb2_request_error_ex: idx[1]
status[NT_STATUS_OBJECT_NAME_COLLISION] || at
../../source3/smbd/smb2_create.c:340
[2023/07/07 16:38:16.799996,  2] ../../source3/smbd/open.c:1678(open_file)
  jaadmin opened file a read=No write=No (numopen=3)
[2023/07/07 16:38:16.800566,  2]
../../source3/smbd/close.c:934(close_normal_file)
  jaadmin closed file a (numopen=1) NT_STATUS_OK
[2023/07/07 16:38:16.801578,  3]
../../source3/smbd/dir.c:1057(smbd_dirptr_get_entry)
  smbd_dirptr_get_entry mask=[*] found . fname=. (.)
[2023/07/07 16:38:16.801612,  3]
../../source3/smbd/dir.c:1057(smbd_dirptr_get_entry)
  smbd_dirptr_get_entry mask=[*] found .. fname=.. (..)
[2023/07/07 16:38:16.801642,  3]
../../source3/smbd/dir.c:1057(smbd_dirptr_get_entry)
  smbd_dirptr_get_entry mask=[*] found a fname=a (a)
[2023/07/07 16:38:16.801668,  3]
../../source3/smbd/smb2_server.c:3962(smbd_smb2_request_error_ex)
  smbd_smb2_request_error_ex: smbd_smb2_request_error_ex: idx[5]
status[STATUS_NO_MORE_FILES] || at
../../source3/smbd/smb2_query_directory.c:160
[2023/07/07 16:38:16.806348,  3]
../../source3/smbd/smb2_notify.c:251(smbd_smb2_notify_send)
  smbd_smb2_notify_send: notify change called on ., filter = DIR_NAME,
recursive = 0
[2023/07/07 16:38:16.806622,  3]
../../source3/smbd/smb2_notify.c:251(smbd_smb2_notify_send)
  smbd_smb2_notify_send: notify change called on ., filter =
FILE_NAME|ATTRIBUTES|LAST_WRITE, recursive = 0
[2023/07/07 16:38:16.806677,  3]
../../source3/smbd/smb2_server.c:3962(smbd_smb2_request_error_ex)
  smbd_smb2_request_error_ex: smbd_smb2_request_error_ex: idx[1]
status[NT_STATUS_CANCELLED] || at ../../source3/smbd/smb2_notify.c:126
[2023/07/07 16:38:16.807629,  3]
../../source3/smbd/smb2_server.c:3962(smbd_smb2_request_error_ex)
  smbd_smb2_request_error_ex: smbd_smb2_request_error_ex: idx[1]
status[NT_STATUS_CANCELLED] || at ../../source3/smbd/smb2_notify.c:126
[2023/07/07 16:38:16.809659,  3]
../../source3/smbd/smb2_server.c:3962(smbd_smb2_request_error_ex)
  smbd_smb2_request_error_ex: smbd_smb2_request_error_ex: idx[1]
status[NT_STATUS_OBJECT_NAME_COLLISION] || at
../../source3/smbd/smb2_create.c:340
[2023/07/07 16:38:16.810260,  3]
../../source3/smbd/smb2_server.c:3962(smbd_smb2_request_error_ex)
  smbd_smb2_request_error_ex: smbd_smb2_request_error_ex: idx[1]
status[NT_STATUS_OBJECT_NAME_COLLISION] || at
../../source3/smbd/smb2_create.c:340
[2023/07/07 16:38:16.810599,  3]
../../source3/smbd/smb2_server.c:3962(smbd_smb2_request_error_ex)
  smbd_smb2_request_error_ex: smbd_smb2_request_error_ex: idx[1]
status[NT_STATUS_OBJECT_NAME_COLLISION] || at
../../source3/smbd/smb2_create.c:340
[2023/07/07 16:38:16.810835,  2] ../../source3/smbd/open.c:1678(open_file)
  jaadmin opened file a read=No write=No (numopen=3)
[2023/07/07 16:38:16.811233,  2]
../../source3/smbd/close.c:934(close_normal_file)
  jaadmin closed file a (numopen=1) NT_STATUS_OK
[2023/07/07 16:38:16.811965,  3]
../../source3/smbd/dir.c:1057(smbd_dirptr_get_entry)
  smbd_dirptr_get_entry mask=[*] found . fname=. (.)
[2023/07/07 16:38:16.811997,  3]
../../source3/smbd/dir.c:1057(smbd_dirptr_get_entry)
  smbd_dirptr_get_entry mask=[*] found .. fname=.. (..)
[2023/07/07 16:38:16.812024,  3]
../../source3/smbd/dir.c:1057(smbd_dirptr_get_entry)
  smbd_dirptr_get_entry mask=[*] found a fname=a (a)
[2023/07/07 16:38:16.812047,  3]
../../source3/smbd/smb2_server.c:3962(smbd_smb2_request_error_ex)
  smbd_smb2_request_error_ex: smbd_smb2_request_error_ex: idx[5]
status[STATUS_NO_MORE_FILES] || at
../../source3/smbd/smb2_query_directory.c:160

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