I recently upgraded my Samba installation from net/samba412 to net/samba413 without any changes to smb4.conf. After the upgrade I can no longer modify files when accessing my share with Linux clients (tested with Fedora and Ubuntu). The server log shows a NT_STATUS_OBJECT_NAME_COLLISION and NT_STATUS_ACCESS_DENIED flag. However, creating new files is still possible. Accessing the share and modyfing files with Windows works without any issues. With a rollback to net/samba412 the problem immediately disappears. My configuration looks like this: ``` [TestShare] guest ok = no comment = Test Share path = /srv/nas/test browseable = yes read only = no create mask = 0755 force user = smb_owner force group = smb_owner ``` The log output from my Samba server: ``` [2020/11/07 18:20:18.371535, 4] ../../source3/auth/pampass.c:485(smb_pam_start) smb_pam_start: PAM: Init user: testuser [2020/11/07 18:20:18.377050, 4] ../../source3/auth/pampass.c:494(smb_pam_start) smb_pam_start: PAM: setting rhost to: 192.168.178.157 [2020/11/07 18:20:18.377079, 4] ../../source3/auth/pampass.c:503(smb_pam_start) smb_pam_start: PAM: setting tty [2020/11/07 18:20:18.377100, 4] ../../source3/auth/pampass.c:511(smb_pam_start) smb_pam_start: PAM: Init passed for user: testuser [2020/11/07 18:20:18.377121, 4] ../../source3/auth/pampass.c:648(smb_internal_pam_session) smb_internal_pam_session: PAM: tty set to: smb/3094293754 [2020/11/07 18:20:18.377287, 4] ../../source3/auth/pampass.c:467(smb_pam_end) smb_pam_end: PAM: PAM_END OK. [2020/11/07 18:20:18.378350, 3] ../../lib/util/access.c:371(allow_access) Allowed connection from 192.168.178.157 (192.168.178.157) [2020/11/07 18:20:18.378419, 3] ../../source3/smbd/service.c:618(make_connection_snum) make_connection_snum: Connect path is '/tmp' for service [IPC$] [2020/11/07 18:20:18.378471, 3] ../../source3/smbd/vfs.c:115(vfs_init_default) Initialising default vfs hooks [2020/11/07 18:20:18.378508, 3] ../../source3/smbd/vfs.c:141(vfs_init_custom) Initialising custom vfs hooks from [/[Default VFS]/] [2020/11/07 18:20:18.378658, 3] ../../source3/smbd/service.c:861(make_connection_snum) testuser-virtualbox (ipv4:192.168.178.157:36750) connect to service IPC$ initially as user testuser (uid=1001, gid=1001) (pid 68515) [2020/11/07 18:20:18.379326, 3] ../../source3/smbd/msdfs.c:1028(get_referred_path) get_referred_path: |testshare| in dfs path \nasify.local\testshare is not a dfs root. [2020/11/07 18:20:18.379368, 3] ../../source3/smbd/smb2_server.c:3863(smbd_smb2_request_error_ex) smbd_smb2_request_error_ex: smbd_smb2_request_error_ex: idx[1] status[NT_STATUS_NOT_FOUND] || at ../../source3/smbd/smb2_ioctl.c:313 [2020/11/07 18:20:18.380016, 3] ../../source3/smbd/service.c:1136(close_cnum) testuser-virtualbox (ipv4:192.168.178.157:36750) closed connection to service IPC$ [2020/11/07 18:20:18.380587, 3] ../../lib/util/access.c:371(allow_access) Allowed connection from 192.168.178.157 (192.168.178.157) [2020/11/07 18:20:18.380856, 3] ../../source3/passdb/lookup_sid.c:1606(get_primary_group_sid) Forcing Primary Group to 'Domain Users' for smb_owner [2020/11/07 18:20:18.381077, 3] ../../source3/passdb/lookup_sid.c:1606(get_primary_group_sid) Forcing Primary Group to 'Domain Users' for smb_owner [2020/11/07 18:20:18.381425, 1] ../../source3/param/loadparm.c:2517(lp_idmap_range) idmap range not specified for domain '*' [2020/11/07 18:20:18.381750, 3] ../../source3/auth/token_util.c:689(finalize_local_nt_token) Failed to fetch domain sid for WORKGROUP [2020/11/07 18:20:18.382042, 3] ../../source3/smbd/service.c:433(set_conn_force_user_group) Forced user smb_owner [2020/11/07 18:20:18.382139, 3] ../../source3/smbd/service.c:323(find_forced_group) Forced group smb_owner [2020/11/07 18:20:18.382168, 3] ../../source3/smbd/service.c:618(make_connection_snum) make_connection_snum: Connect path is '/srv/nas/exchange' for service [TestShare] [2020/11/07 18:20:18.382209, 3] ../../source3/smbd/vfs.c:115(vfs_init_default) Initialising default vfs hooks [2020/11/07 18:20:18.382231, 3] ../../source3/smbd/vfs.c:141(vfs_init_custom) Initialising custom vfs hooks from [/[Default VFS]/] [2020/11/07 18:20:18.382417, 2] ../../source3/smbd/service.c:861(make_connection_snum) testuser-virtualbox (ipv4:192.168.178.157:36750) connect to service TestShare initially as user smb_owner (uid=1003, gid=1003) (pid 68515) [2020/11/07 18:20:18.384552, 3] ../../source3/smbd/trans2.c:3637(smbd_do_qfsinfo) smbd_do_qfsinfo: level = 1005 [2020/11/07 18:20:18.387531, 2] ../../source3/smbd/open.c:1523(open_file) smb_owner opened file test/test/Textdatei.txt read=No write=No (numopen=1) [2020/11/07 18:20:18.388986, 2] ../../source3/smbd/close.c:823(close_normal_file) smb_owner closed file test/test/Textdatei.txt (numopen=0) NT_STATUS_OK [2020/11/07 18:20:18.390875, 3] ../../source3/smbd/smb2_server.c:3863(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:334 [2020/11/07 18:20:18.392160, 2] ../../source3/smbd/open.c:1523(open_file) smb_owner opened file test/test/~gvfUNjT.tmp read=Yes write=Yes (numopen=1) [2020/11/07 18:20:18.394268, 3] ../../source3/lib/util.c:1079(fcntl_getlock) fcntl_getlock: fd 7 is returned info 2 pid 0 [2020/11/07 18:20:18.394553, 3] ../../source3/smbd/smb2_write.c:215(smb2_write_complete_internal) smb2: fnum 286895378, file test/test/~gvfUNjT.tmp, length=46 offset=0 wrote=46 [2020/11/07 18:20:18.396691, 2] ../../source3/smbd/close.c:823(close_normal_file) smb_owner closed file test/test/~gvfUNjT.tmp (numopen=0) NT_STATUS_OK [2020/11/07 18:20:18.397616, 2] ../../source3/smbd/open.c:1523(open_file) smb_owner opened file test/test/Textdatei.txt read=No write=No (numopen=1) [2020/11/07 18:20:18.399528, 2] ../../source3/smbd/close.c:823(close_normal_file) smb_owner closed file test/test/Textdatei.txt (numopen=0) NT_STATUS_ACCESS_DENIED [2020/11/07 18:20:18.399631, 3] ../../source3/smbd/smb2_server.c:3863(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_close.c:111 [2020/11/07 18:20:18.400474, 2] ../../source3/smbd/open.c:1523(open_file) smb_owner opened file test/test/Textdatei.txt read=No write=No (numopen=1) [2020/11/07 18:20:18.402078, 2] ../../source3/smbd/close.c:823(close_normal_file) smb_owner closed file test/test/Textdatei.txt (numopen=0) NT_STATUS_OK [2020/11/07 18:20:18.403077, 2] ../../source3/smbd/open.c:1523(open_file) smb_owner opened file test/test/~gvfUNjT.tmp read=No write=No (numopen=1) [2020/11/07 18:20:18.403884, 2] ../../source3/smbd/close.c:823(close_normal_file) smb_owner closed file test/test/~gvfUNjT.tmp (numopen=0) NT_STATUS_ACCESS_DENIED [2020/11/07 18:20:18.403928, 3] ../../source3/smbd/smb2_server.c:3863(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_close.c:111 [2020/11/07 18:20:18.404805, 2] ../../source3/smbd/open.c:1523(open_file) smb_owner opened file test/test/~gvfUNjT.tmp read=No write=No (numopen=1) [2020/11/07 18:20:18.406367, 2] ../../source3/smbd/close.c:823(close_normal_file) smb_owner closed file test/test/~gvfUNjT.tmp (numopen=0) NT_STATUS_OK ```