PM80254: Accessing NCA exported VOB causes Linux NFS server to panic

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You can track all active APARs for this component.

APAR status

  • Closed as program error.

Error description

  • When an IBM Rational ClearCase view/VOB combination exported
    from Red Hat Enterprise Linux 5.7 is accessed from a remote host
    the server will panic. A crash dump reveals a backtrace similar
    to the following:
    
    PANIC: 'mvfs: LOCK: recursive lock
    ffff810071cda0a0:/vobs/public/linux_vnode/rhat_x86/linux_x86_64_
    2618_rhel5/mvfsobj/mvfs_mnode.c:
    mfs_mnget :1410, locker
    /vobs/public/linux_vnode/rhat_x86/linux_x86_64_2618_rhel5/mvfsob
    j/mvfs_clnt.c:1601?0?Kernel
    panic - not syncing: VNODE panic'
    
    crash? bt
    PID: 3659   TASK: ffff810071362100  CPU: 0   COMMAND: 'nfsd'
     #0 [ffff810070e85378] crash_kexec at ffffffff800afee7
     #1 [ffff810070e85438] panic at ffffffff80093395
     #2 [ffff810070e85588] dev_queue_xmit at ffffffff8002f7ea
     #3 [ffff810070e85608] mfs_mnget at ffffffff88774f63
     #4 [ffff810070e85698] mfs_getmnode at ffffffff8875840e
     #5 [ffff810070e856e8] mfs_getvnode at ffffffff8875874c
     #6 [ffff810070e85728] mfs_bindroot at ffffffff8875c634
     #7 [ffff810070e85788] mfs_getattr at ffffffff8875fa61
     #8 [ffff810070e857d8] mvfs_linux_getattr_wrapper at
    ffffffff88795e13
     #9 [ffff810070e85808] vnode_iop_getattr at ffffffff88799b5e
    #10 [ffff810070e85848] encode_post_op_attr at ffffffff8871b8c7
    #11 [ffff810070e858e8] encode_entry at ffffffff8871c05d
    #12 [ffff810070e85bb8] nfs3svc_encode_entry_plus at
    ffffffff8871c377
    #13 [ffff810070e85bd8] mdki_linux_readdir_uiomove at
    ffffffff887a1764
    #14 [ffff810070e85c18] mfs_clnt_readdir at ffffffff887886db
    #15 [ffff810070e85ca8] mvfs_readdir_ctx at ffffffff88762f7f
    #16 [ffff810070e85cf8] vnode_fop_readdir at ffffffff887987d2
    #17 [ffff810070e85d88] vfs_readdir at ffffffff80035151
    #18 [ffff810070e85dc8] nfsd_readdir at ffffffff88713ef6
    #19 [ffff810070e85e08] nfsd3_proc_readdirplus at
    ffffffff8871b1ee
    #20 [ffff810070e85e48] nfsd_dispatch at ffffffff887101db
    #21 [ffff810070e85e78] svc_process at ffffffff8862980d
    #22 [ffff810070e85ee8] nfsd at ffffffff88710725
    #23 [ffff810070e85f48] kernel_thread at ffffffff8005dfb1
    
    Note this has also been observed on RHEL 5.8, and with ClearCase
    7.1.2.9.
    
    Steps to reproduce:
    
    1. Export a view/VOB combination for non-ClearCase access on
    RHEL 5.7 server running ClearCase 7.1.2.8
    2. Mount the export from another UNIX client and cd into the
    view/VOB
    3. Run 'ls' in the VOB root.
    
    Workaround: There is no known workaround to this defect.
    

Local fix

Problem summary

  • ****************************************************************
    * USERS AFFECTED:                                              *
    ****************************************************************
    * PROBLEM DESCRIPTION:                                         *
    ****************************************************************
    * RECOMMENDATION:                                              *
    ****************************************************************
    Accessing NCA exported VOB causes Linux NFS server to panic
    

Problem conclusion

  • A fix is available in ClearCase versions 7.1.2.10 and
    8.0.0.6
    

Temporary fix

Comments

APAR Information

  • APAR number

    PM80254

  • Reported component name

    CLEARCASE UNIX

  • Reported component ID

    5724G2901

  • Reported release

    712

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2013-01-09

  • Closed date

    2013-03-21

  • Last modified date

    2013-03-21

  • APAR is sysrouted FROM one or more of the following:

  • APAR is sysrouted TO one or more of the following:

Fix information

  • Fixed component name

    CLEARCASE UNIX

  • Fixed component ID

    5724G2901

Applicable component levels

  • R712 PSN

       UP



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Document information


More support for:

Rational ClearCase

Software version:

7.1.2

Reference #:

PM80254

Modified date:

2013-03-21

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