The following code quickly consumes all available memory on the machine:

sage: P = MixedIntegerLinearProgram(solver="Coin")

sage: P.add_constraint(P[0]+P[1]==1)
sage: while True:
....:   P = copy(P)
....:   w = solve(P)

A ticket has been opened, #12004. If the solver is GLPK, however, this issue 
does not arise.

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