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Oracle Linux: After Upgrading To OL 7.6, CIFS Shares Fail To Mount Without The "vers=XXX" Mount Option (Doc ID 2505195.1)

Last updated on MAY 15, 2020

Applies to:

Linux OS - Version Oracle Linux 7.6 and later
Information in this document applies to any platform.

Symptoms

After upgrading to OL 7.6, cannot mount CIFS share when "vers=default" is used or version is not specified.

Changes

 Patched the Server.

Kernel upgraded from kernel-3.10.0-862.14.4.el7.x86_64 to kernel-3.10.0-957.1.3.el7.x86_64
Package libsmbclient has been updated from 4.7.1-9.el7_5.x86_64 to 4.8.3-4.el7.x86_64

Logs from /var/log/messages

Jan 21 16:16:41 <HOST> kernel: No dialect specified on mount. Default has changed to a more secure dialect, SMB2.1 or later (e.g. SMB3), from CIFS (SMB1). To use the less secure SMB1 dialect to access old servers which do not support SMB3 (or SMB2.1) specify vers=1.0 on mount.
Jan 21 16:16:41 <HOST> kernel: CIFS VFS: protocol revalidation - security settings mismatch
Jan 21 16:16:41 <HOST> kernel: CIFS VFS: failed to connect to IPC (rc=-5)
Jan 21 16:16:41 <HOST> kernel: CIFS VFS: protocol revalidation - security settings mismatch
Jan 21 16:16:41 <HOST> kernel: CIFS VFS: session ffff9f51670be800 has no tcon available for a dfs referral request
Jan 21 16:16:41 <HOST> kernel: CIFS VFS: cifs_mount failed w/return code = -5

 

Error while mounting manually

[root@<HOST># mount /shares/mnt
mount error(5): Input/output error
CIFS Parameters
“rw,domain=xxxxxxx,file_mode=0777,dir_mode=0777,uid=74581,gid=9596215,username=oracle1,password=xxxxxxx”

 

Cause

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In this Document
Symptoms
Changes
Cause
Solution
References


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