[Cbc] [CBC] Preprocess causing infeasibility

[mg]

Hi all,
I've found a case where preprocess says the problem is infeasible, but if I
turn preprocess off, the problem is correctly solved.

Attached you can find the LP file (m3.lp). To reproduce the problem you can
use the following code (I use callCbc):

OsiClpSolverInterface solver;
CbcModel model(solver);
model.solver()->readLp("m3.lp");
std::string args("-heur off -cuts off -solve");
// using these arguments instead it works
// std::string args("-heur off -cuts off -preprocess off -solve");
callCbc(args, model);

The problem happens in both 2.9.5 release and 2.9.6 release versions.

Thanks in advance,
Marco
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