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RHEL 6 NFS クライアントが "NFS:directory XXXXX contains a readdir loop" と出力します

Solution Verified - Updated -

Issue

  • NFS マウント上の大きなディレクトリのファイルリストを取得すると、循環ループがない場合に、しばしば stdout またはカーネルログ (dmesg) に ELOOP (errno 40) エラーを発生させます。

  • Dovecot が /var/log/maillog に以下のメッセージを生成します。

Jan 18 13:32:04 host dovecot: imap-login:Login: user=<staff3>, method=PLAIN, rip=172.19.1.241, lip=172.19.1.34, mpid=12283
Jan 18 13:32:22 host dovecot: imap(staff3):Disconnected:Logged out bytes=717/4619
Jan 18 13:32:27 host dovecot: imap-login:Login: user=<testc3>, method=PLAIN, rip=172.19.1.241, lip=172.19.1.34, mpid=12292, TLS
Jan 18 13:32:30 host dovecot: imap(testc3):Error: readdir(/export/mail/testc3/Maildir/new) failed:Too many levels of symbolic links
  • 以下のエラーが /var/log/messages に表示されます。
Jan 18 13:32:29 host kernel:NFS: directory Maildir/new contains a readdir loop.Please contact your server vendor.Offending cookie:69645
Jan 18 13:32:30 host kernel:NFS: directory Maildir/new contains a readdir loop.Please contact your server vendor.Offending cookie:69645

Environment

  • Red Hat Enterprise Linux 6.2
  • kernel-2.6.32-220.el6

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