I got the following error from gdb:

*** glibc detected *** /.root0/autohome/u132/hsreekum/ipopt/ipopt/debug/Ipopt/examples/ex3/ex3: free(): invalid next size (fast): 0x0000000120052b60 ***

Here's the backtrace:

#0  0x000000555626b264 in raise () from /lib/libc.so.6
#1  0x000000555626cc6c in abort () from /lib/libc.so.6
#2  0x00000055562a7b9c in __libc_message () from /lib/libc.so.6
#3  0x00000055562aeabc in malloc_printerr () from /lib/libc.so.6
#4  0x00000055562b036c in free () from /lib/libc.so.6
#5  0x000000555561ddd0 in Ipopt::TNLPAdapter::~TNLPAdapter ()
   from /home/ba01/u132/hsreekum/ipopt/ipopt/build/lib/libipopt.so.1
#6  0x00000055556a9910 in Ipopt::GradientScaling::~GradientScaling ()
   from /home/ba01/u132/hsreekum/ipopt/ipopt/build/lib/libipopt.so.1
#7  0x00000055557241b8 in Ipopt::OrigIpoptNLP::~OrigIpoptNLP ()
   from /home/ba01/u132/hsreekum/ipopt/ipopt/build/lib/libipopt.so.1
#8  0x00000055556ae7f0 in Ipopt::IpoptAlgorithm::~IpoptAlgorithm ()
   from /home/ba01/u132/hsreekum/ipopt/ipopt/build/lib/libipopt.so.1
#9  0x0000005555602278 in Ipopt::IpoptApplication::~IpoptApplication ()
   from /home/ba01/u132/hsreekum/ipopt/ipopt/build/lib/libipopt.so.1
#10 0x0000005555614428 in FreeIpoptProblem ()
   from /home/ba01/u132/hsreekum/ipopt/ipopt/build/lib/libipopt.so.1
#11 0x0000000120001610 in main () at ex3.c:169`

And here's the code for Ipopt::TNLPAdapter::~TNLPAdapter ()

  TNLPAdapter::~TNLPAdapter()
  {
    delete [] full_x_;
    delete [] full_lambda_;
    delete [] full_g_;
    delete [] jac_g_;
    delete [] c_rhs_;
    delete [] jac_idx_map_;
    delete [] h_idx_map_;
    delete [] x_fixed_map_;
    delete [] findiff_jac_ia_;
    delete [] findiff_jac_ja_;
    delete [] findiff_jac_postriplet_;
    delete [] findiff_x_l_;
    delete [] findiff_x_u_;
  }

My question is : why does free() throw an error when ~TNLPAdapter() uses delete[]? Also, I would like to step through ~TNLPAdapter() so I can see which deallocation causes the error. I believe the error occurs in the external library (IPOPT) but I have compiled it with debug flags on ; is this sufficient?