[Ipopt-tickets] [Ipopt] #283: Memory leak in Ipopt::Ma86SolverInterface

[Ipopt]

#283: Memory leak in Ipopt::Ma86SolverInterface
------------------------+------------------------
Reporter:  mhahn        |      Owner:  ipopt-team
    Type:  defect       |     Status:  new
Priority:  normal       |  Component:  Ipopt
 Version:  3.12         |   Severity:  major
Keywords:  memory leak  |
------------------------+------------------------
 It appears that the member array {{{order_}}} in the class
 {{{Ipopt::Ma86SolverInterface}}} is not being freed upon destruction of
 the solver interface. While not a major concern in single NLP solves, this
 appears to lead to a cumulative loss of free memory in applications where
 a large number of NLP solves must be performed (e.g. as relaxation solver
 in MINLP branch and bound).

 To reproduce, build IPOPT (revision indicated in {{{svn-info}}}) after
 getting third party dependencies and configuring with the following
 arguments:
 {{{
 ./configure --with-asl=BUILD --with-metis=BUILD --with-hsl=BUILD --with-
 mumps=BUILD --enable-debug
 }}}
 In this instance, BLAS and LAPACK are provided through the OS distribution
 (Ubuntu 17.04) and the HSL version is 2014.01.10.

 Then, install IPOPT and dependencies to a prefix of your choice, and
 execute the following following command line to solve the problem
 described in the attached file {{{batch.nl}}}:
 {{{
 valgrind --tool=memcheck --leak-check=full ipopt batch.nl
 linear_solver=ma86 outlev=5
 }}}
 The expected output (mixed stdout/stderr) is attached in
 {{{valgrind.log}}}.

 A possible fix is given in {{{possible-fix.diff}}}. It appears to get rid
 of the leak reported by {{{valgrind}}}. However, I have not verified
 whether there is a set of circumstances in which {{{order_ == NULL}}} when
 the destructor is invoked.

 Attached are:
 * {{{batch.nl}}}: A stub .nl file derived from the test problem 'batch'
 from the MacMINLP collection
 (https://wiki.mcs.anl.gov/leyffer/index.php/MacMINLP)
 * {{{svn-info}}}: A dump of the output of {{{svn info}}} to indicate the
 branch and revision of IPOPT that was used
 * {{{valgrind.log}}}: A dump of both stdout and stderr for the example run
 * {{{possible-fix.diff}}}: A diff file indicating a possible fix that
 removes the leak reported in {{{valgrind.log}}}

--
Ticket URL: <https://projects.coin-or.org/Ipopt/ticket/283>
Ipopt <http://projects.coin-or.org/Ipopt>
Interior-point optimizer for nonlinear programs.