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    <p>It's unsat_core_example3() that is crashing. I tracked down the problem to <code>expr_substitution::find()</code> proofs_enabled() == false there</p> <p>but in <code>rewriter_tpl&lt;Config&gt;::visit(expr * t, unsigned max_depth)</code>, ProofGen == true, but from the call 'm_cfg.get_subst(t, new_t, new_t_pr)', new_t_pr is uninitialized.</p> <p>What valgrind has to say:</p> <pre><code>==26885== Conditional jump or move depends on uninitialised value(s) ==26885== at 0x4C21802: bool rewriter_tpl&lt;th_rewriter_cfg&gt;::visit&lt;true&gt;(expr*, unsigned int) (ast.h:1562) ==26885== by 0x4C21A77: void rewriter_tpl&lt;th_rewriter_cfg&gt;::process_app&lt;true&gt;(app*, rewriter_core::frame&amp;) (rewriter_def.h:179) ==26885== by 0x4C23303: void rewriter_tpl&lt;th_rewriter_cfg&gt;::resume_core&lt;true&gt;(obj_ref&lt;expr, ast_manager&gt;&amp;, obj_ref&lt;app, ast_manager&gt;&amp;) (rewriter_def.h:602) ==26885== by 0x4B1EF9C: propagate_values_tactic::imp::operator()(ref&lt;goal&gt; const&amp;, sref_buffer&lt;goal, 16u&gt;&amp;, ref&lt;model_converter&gt;&amp;, ref&lt;proof_converter&gt;&amp;, obj_ref&lt;dependency_manager&lt;ast_manager::expr_dependency_config&gt;::dependency, ast_manager&gt;&amp;) (propagate_values_tactic.cpp:128) ==26885== by 0x4B21591: propagate_values_tactic::operator()(ref&lt;goal&gt; const&amp;, sref_buffer&lt;goal, 16u&gt;&amp;, ref&lt;model_converter&gt;&amp;, ref&lt;proof_converter&gt;&amp;, obj_ref&lt;dependency_manager&lt;ast_manager::expr_dependency_config&gt;::dependency, ast_manager&gt;&amp;) (propagate_values_tactic.cpp:249) ==26885== by 0x4B8BA9A: cleanup_tactical::operator()(ref&lt;goal&gt; const&amp;, sref_buffer&lt;goal, 16u&gt;&amp;, ref&lt;model_converter&gt;&amp;, ref&lt;proof_converter&gt;&amp;, obj_ref&lt;dependency_manager&lt;ast_manager::expr_dependency_config&gt;::dependency, ast_manager&gt;&amp;) (tactical.cpp:1192) ==26885== by 0x4B8ED2D: and_then_tactical::operator()(ref&lt;goal&gt; const&amp;, sref_buffer&lt;goal, 16u&gt;&amp;, ref&lt;model_converter&gt;&amp;, ref&lt;proof_converter&gt;&amp;, obj_ref&lt;dependency_manager&lt;ast_manager::expr_dependency_config&gt;::dependency, ast_manager&gt;&amp;) (tactical.cpp:157) ==26885== by 0x4B90914: and_then_tactical::operator()(ref&lt;goal&gt; const&amp;, sref_buffer&lt;goal, 16u&gt;&amp;, ref&lt;model_converter&gt;&amp;, ref&lt;proof_converter&gt;&amp;, obj_ref&lt;dependency_manager&lt;ast_manager::expr_dependency_config&gt;::dependency, ast_manager&gt;&amp;) (tactical.cpp:170) ==26885== by 0x4B8ED2D: and_then_tactical::operator()(ref&lt;goal&gt; const&amp;, sref_buffer&lt;goal, 16u&gt;&amp;, ref&lt;model_converter&gt;&amp;, ref&lt;proof_converter&gt;&amp;, obj_ref&lt;dependency_manager&lt;ast_manager::expr_dependency_config&gt;::dependency, ast_manager&gt;&amp;) (tactical.cpp:157) ==26885== by 0x4B8ED2D: and_then_tactical::operator()(ref&lt;goal&gt; const&amp;, sref_buffer&lt;goal, 16u&gt;&amp;, ref&lt;model_converter&gt;&amp;, ref&lt;proof_converter&gt;&amp;, obj_ref&lt;dependency_manager&lt;ast_manager::expr_dependency_config&gt;::dependency, ast_manager&gt;&amp;) (tactical.cpp:157) ==26885== by 0x4B90914: and_then_tactical::operator()(ref&lt;goal&gt; const&amp;, sref_buffer&lt;goal, 16u&gt;&amp;, ref&lt;model_converter&gt;&amp;, ref&lt;proof_converter&gt;&amp;, obj_ref&lt;dependency_manager&lt;ast_manager::expr_dependency_config&gt;::dependency, ast_manager&gt;&amp;) (tactical.cpp:170) ==26885== by 0x4B94C1A: exec(tactic&amp;, ref&lt;goal&gt; const&amp;, sref_buffer&lt;goal, 16u&gt;&amp;, ref&lt;model_converter&gt;&amp;, ref&lt;proof_converter&gt;&amp;, obj_ref&lt;dependency_manager&lt;ast_manager::expr_dependency_config&gt;::dependency, ast_manager&gt;&amp;) (tactic.cpp:179) </code></pre>
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