IBM Support

PI62956: VIEW_SERVER SEGMENTATION FAULT OCCURING DUE TO REFERENCING REUSED MEMORY

Subscribe

You can track all active APARs for this component.

 

APAR status

  • Closed as program error.

Error description

  • While running IBM Rational ClearCase version 8.0.1.9 a
    view_server segmentation fault can occur, if the eacl cache gets
    flushed between retransmissions of an RPC from a client.
    The second transmission triggers view_server to refer to memory
    that has been reused causing it to terminate.
    
    An example backtrace of the core file (from a Solaris 11 host):
    Program terminated with signal 11, Segmentation fault.
    #0  0xfe4bc183 in xdr_tbs_acl_cooked_info_block ()
       from /opt/rational/clearcase/shlib/libatriatbs.so
    (gdb) #0  0xfe4bc183 in xdr_tbs_acl_cooked_info_block ()
       from /opt/rational/clearcase/shlib/libatriatbs.so
    #1  0xfe4bc6ba in xdr_tbs_sid_acl_fragment_t ()
       from /opt/rational/clearcase/shlib/libatriatbs.so
    #2  0x080c7b61 in xdr_view_eacl_rolemap_reply_t ()
    #3  0xfe42510f in xdr_ks_accepted_reply ()
       from /opt/rational/clearcase/shlib/libatriaks.so
    #4  0xf3c3659b in xdr_union () from /usr/lib/libnsl.so.1
    #5  0xfe4251ff in xdr_ks_replymsg ()
       from /opt/rational/clearcase/shlib/libatriaks.so
    #6  0xfe435f56 in ks_svc_dg_reply ()
       from /opt/rational/clearcase/shlib/libatriaks.so
    #7  0xfe434878 in ks_svc_sendreply ()
       from /opt/rational/clearcase/shlib/libatriaks.so
    #8  0x080b0fed in view_server_disp ()
    #9  0xfe434e3f in ks_svc_process_request ()
       from /opt/rational/clearcase/shlib/libatriaks.so
    #10 0xfe434cad in ks_svc_getreqset ()
       from /opt/rational/clearcase/shlib/libatriaks.so
    #11 0x080b2e50 in client_rpc ()
    #12 0xfe42974d in rt_wait () from
    /opt/rational/clearcase/shlib/libatriaks.so
    #13 0xfe429f9c in rt_run () from
    /opt/rational/clearcase/shlib/libatriaks.so
    #14 0x080922b4 in main ()
    
    WORKAROUND:
    None.
    

Local fix

Problem summary

  • ****************************************************************
    * USERS AFFECTED:                                              *
    * Users of IBM ClearCase VOB with ACLs enabled and a heavily   *
    * loaded view_server process.                                  *
    ****************************************************************
    * PROBLEM DESCRIPTION:                                         *
    * In rare circumstances when using an IBM ClearCase VOB with   *
    * ACLs enabled, a heavily loaded view_server process may crash *
    * due to invalid references to memory that has been reused.    *
    ****************************************************************
    * RECOMMENDATION:                                              *
    ****************************************************************
    

Problem conclusion

  • A fix is available in ClearCase versions 8.0.1.12 and 9.0.0.2
    

Temporary fix

Comments

APAR Information

  • APAR number

    PI62956

  • Reported component name

    CC&CC MSITE WIN

  • Reported component ID

    5724G3300

  • Reported release

    801

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2016-05-24

  • Closed date

    2016-09-16

  • Last modified date

    2016-09-16

  • 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

    CC&CC MSITE WIN

  • Fixed component ID

    5724G3300

Applicable component levels

  • R801 PSY

       UP

  • R900 PSY

       UP

[{"Line of Business":{"code":"LOB36","label":"IBM Automation"},"Business Unit":{"code":"BU053","label":"Cloud \u0026 Data Platform"},"Product":{"code":"SSSH3S","label":"Rational ClearCase MultiSite"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"801"}]

Document Information

Modified date:
14 September 2021