PI41762: CLEARCASE ABE MAY CRASH WITH DOUBLE-FREE OR INVALID POINTER ERROR ON LINUX

Rational ClearCase Fix Pack 11 (8.0.1.11) for 8.0.1
Rational ClearCase Fix Pack 1 (9.0.0.1) for 9.0
Rational ClearCase Fix Pack 12 (8.0.1.12) for 8.0.1
Rational ClearCase Fix Pack 2 (9.0.0.2) for 9.0
Rational ClearCase Fix Pack 13 (8.0.1.13) for 8.0.1
Rational ClearCase Fix Pack 3 (9.0.0.3) for 9.0
Rational ClearCase Fix Pack 14 (8.0.1.14) for 8.0.1
Rational ClearCase Fix Pack 4 (9.0.0.4) for 9.0
Rational ClearCase Fix Pack 15 (8.0.1.15) for 8.0.1
Rational ClearCase Fix Pack 5 (9.0.0.5) for 9.0
Rational ClearCase Fix Pack 6 (9.0.0.6) for 9.0
Rational ClearCase Fix Pack 16 (8.0.1.16) for 8.0.1
Rational ClearCase Fix Pack 17 (8.0.1.17) for 8.0.1
Rational ClearCase Fix Pack 18 (8.0.1.18) for 8.0.1
Rational ClearCase Fix Pack 19 (8.0.1.19) for 8.0.1
Rational ClearCase Fix Pack 20 (8.0.1.20) for 8.0.1
Rational ClearCase Fix Pack 21 (8.0.1.21) for 8.0.1
Rational ClearCase Fix Pack 22 (8.0.1.22) for 8.0.1
Rational ClearCase Fix Pack 23 (8.0.1.23) for 8.0.1
Rational ClearCase Fix Pack 24 (8.0.1.24) for 8.0.1
Rational ClearCase Fix Pack 25 (8.0.1.25) for 8.0.1

APAR status

• Closed as program error.

Error description

• When performing a parallel or distributed build using IBM
  Rational ClearCase clearmake on a Linux host, the Automated
  Build Executor (ABE) process may crash with the following
  message:
  
  *** glibc detected *** /opt/rational/clearcase/etc/abe: free():
  invalid pointer: 0x091ba4a8 ***
  
  While the error message may initially resemble the one in APAR
  PK66029, analysis shows that a different call stack is behind
  the issue.
  
  If core files are enabled, analysis of the core file may show
  that
  /opt/rational/clearcase/shlib/libezrpc.so is the clearcase
  library before libc.so.6.
  

Local fix

• For a parallel build, where the ABE is directly executed by
  clearmake, set the MALLOC_CHECK_ environment variable to 0
  before starting clearmake.
  
  For a distributed build, the environment variable needs to be
  set on the remote build host.
  This can be done by:
  - using a a "wrapper script" in place of the ABE executable, or
  - Ensuring that the environment variable is set by all ssh
  sessions coming from the build user.
  
  The latter method may be challenging depending on the user
  shell, and how the ssh daemon is configured to process the
  user's shell startup scripts
  

Problem summary

• ****************************************************************
  * USERS AFFECTED:                                              *
  * Users of IBM ClearCase clearmake.                            *
  ****************************************************************
  * PROBLEM DESCRIPTION:                                         *
  * IBM ClearCase clearmake on a unix platform may crash with a  *
  * segmentation fault for a specific clearmake case where a     *
  * target has multiple dependencies, and in the building of the *
  * target, one or more of the dependencies are specifically     *
  * removed.                                                     *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  

Problem conclusion

• A fix is available in ClearCase versions 8.0.1.11 and 9.0.0.1
  

Temporary fix

Comments

APAR Information

• 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 WIN

• Fixed component ID

  5724G2900

Applicable component levels

• R801 PSY

     UP

• R900 PSY

     UP