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Jul 10 15:31:14 hostname kernel: CIFS VFS: Close unmatched open
Jul 10 15:33:53 hostname kernel: CIFS VFS: Close unmatched open
Jul 10 15:33:53 hostname kernel: CIFS VFS: Close unmatched open
At the same time the CIFS shares mounted becomes stale as well.
I saw this bug and I am facing same errors in logs and my issue is similar. But a kernel update was done to this particular version on June28th, however, the errors started in logs on June 24th. So, I am confused, is it really this bug or something else.
https://bugs.centos.org/view.php?id=16242
As far as I know no changes were made at server side or file share side and also similar SMB shares are mounted in few other CentOS servers with same version where we don't face any issues.
A reboot is only what it fixes the issue.