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  1. Lustre
  2. LU-6619

lustre/obdclass does not get cleared while stopping/cleanup Lustre if setup had additional MDT present

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Details

    • Bug
    • Resolution: Cannot Reproduce
    • Major
    • None
    • Lustre 2.7.0
    • Scientific Linux release 6.6 (Carbon)

    Description

      Hi,

      Pre-requisite to reproduce this bug :

      1. A single Scientific Linux (release 6.6) VM, with min 1 GB memory and
      50GB disk space.
      2. A lustre setup 2.7.51 up and running on the above VM, in my case all
      lustre components are configured on the same VM .
      3. I have added 1 extra MDT of 15 GB to the lustre setup, the MDT was
      created on loop device.
      ===================================

      1. Steps to reproduce the issue :
        ===================================
        1. run dd command to generate some IO on the lustre filesystem .
        ( dd if=/dev/zero of=/mnt/lustre/test bs=512M count=10).
        2. Once IOs are completed , stop Lustre filesystem , i had executed
        lustrecleanup.sh script (../lustre-release/lustre/tests/llmountcleanup.sh)
        to unmount/stop the lustre.
        3. After the unmount completes, lustre prints error message on the
        terminal :module lustre/obdclass stil loaded
        =======================================
        Command prompt trace :
        =============================
        [root@localhost ~]# sh /var/lib/jenkins/jobs/Lustre-New-Test/workspace/default/lustre-release/lustre/tests/ llmountcleanup.sh
        Stopping clients: localhost /mnt/lustre (opts:-f)
        Stopping client localhost /mnt/lustre opts:-f
        Stopping clients: localhost /mnt/lustre2 (opts:-f)
        Stopping /mnt/mds1 (opts:-f) on localhost
        Stopping /mnt/ost1 (opts:-f) on localhost
        Stopping /mnt/ost2 (opts:-f) on localhost
        2 UP mgc MGC192.168.102.13@tcp 9918b9be-ec01-ce40-5dc1-d4ebb297e839 5
        3 UP mds MDS MDS_uuid 3
        23 UP osd-ldiskfs lustre-MDT0001-osd lustre-MDT0001-osd_UUID 9
        24 UP lod lustre-MDT0001-mdtlov lustre-MDT0001-mdtlov_UUID 4
        25 UP mdt lustre-MDT0001 lustre-MDT0001_UUID 5
        26 UP mdd lustre-MDD0001 lustre-MDD0001_UUID 4
        27 UP osp lustre-MDT0000-osp-MDT0001 lustre-MDT0001-mdtlov_UUID 5
        28 UP osp lustre-OST0000-osc-MDT0001 lustre-MDT0001-mdtlov_UUID 5
        29 UP osp lustre-OST0001-osc-MDT0001 lustre-MDT0001-mdtlov_UUID 5
        30 UP lwp lustre-MDT0000-lwp-MDT0001 lustre-MDT0000-lwp-MDT0001_UUID 5
        Modules still loaded: ************
        lustre/osp/osp.o lustre/lod/lod.o lustre/mdt/mdt.o lustre/mdd/mdd.o ldiskfs/ldiskfs.o lustre/quota/lquota.o lustre/lfsck/lfsck.o lustre/mgc/mgc.o lustre/fid/fid.o lustre/fld/fld.o lustre/ptlrpc/ptlrpc.o lustre/obdc lass/obdclass.o lnet/klnds/socklnd/ksocklnd.o lnet/lnet/lnet.o libcfs/libcfs/libcfs.o
        ==================================================
        4. Now after this message, I had manually unmounted the additional MDT , which results into call traces.
        5. Var/log/messages shows--> proc_dir_entry 'lustre/lov' already registered, proc_dir_entry 'lustre/osc' already registered followed by call trace .
        5. After this , if lustre mount/start is attempted , then the process Hangs
        sometime ,Again results into call traces at the backend.
        6. Reboot is the solution to cleanup everything and start a fresh.
        ====================================================
        Attaching /var/log/messages and dmesgs from the Lustre setup.
        ====================================================
        Thanks,
        Paramita Varma

      Attachments

        1. dmesg-proc-cleaning.txt
          92 kB
          Paramita varma
        2. log-message-with-disk-device-MDT.txt
          16 kB
          Paramita varma
        3. log-message-with-disk-device-MDT.txt
          16 kB
          Paramita varma
        4. proc-cleaning-log-messages.txt
          39 kB
          Paramita varma

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            wc-triage WC Triage
            paramitavarma Paramita varma (Inactive)
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            Dates

              Created:
              Updated:
              Resolved: