RS01215: SOLVE CALLBACK CAN CAUSE A SEGMENTATION FAULT IN A DUAL PRESOLVE REDUCTION IF A FEASIBLE SOLUTION ALREADY AVAILABLE

APAR status

• Closed as fixed if next.

Error description

• If CPLEX finds a feasible solution before the root node solve,
  or a MIP start is provided, it is possible for one of the
  dual presolve reductions to find a better solution.   In
  that case, functions that invoke the solve callback are
  involved, and a NULL pointer access can cause a segmentation
  fault.
  
  Workaround consists of disabling dual presolve reductions.
  Fixed in 12.5.0.1
  
  RTC - 14645.
  

Local fix

• Disable dual presolve reductions.   If that doesn't work,
  contact ILOG/IBM Optimization support for information on
  the undocumented functionality to disable the particular
  presolve parameter involved.
  

Problem summary

• If one of CPLEX's heuristics that runs before the root node LP
  solve finds a feasible solution, a program with a solve callback
  can access a NULL pointer during a dual presolve reduction.
  

Problem conclusion

Temporary fix

• No.
  

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

Applicable component levels

• RC50 PSY

     UP