<div>Since that's a giant-ass model, here's a tiny one that exhibits the same sort of behavior:<br></div><div><br></div><div><a href="https://gist.github.com/RHavar/47b912d7250a17075ba8e7aeefa77a34">https://gist.github.com/RHavar/47b912d7250a17075ba8e7aeefa77a34</a><br></div><div><br></div><div>results in: <span class="s1">Segmentation fault: 11</span><br></div><div><br></div><div class="protonmail_signature_block"><div class="protonmail_signature_block-user"><div>-Ryan<br></div></div><div class="protonmail_signature_block-proton protonmail_signature_block-empty"><br></div></div><div><br></div><blockquote type="cite" class="protonmail_quote"><div>-------- Original Message --------<br></div><div>Subject: Using SOS1 getting malloc: pointer being freed was not allocated<br></div><div>Local Time: January 1, 2018 10:10 AM<br></div><div>UTC Time: January 1, 2018 4:10 PM<br></div><div>From: rhavar@protonmail.com<br></div><div>To: cbc@list.coin-or.org <cbc@list.coin-or.org><br></div><div><br></div><div>Example:<br></div><div><br></div><div><a href="https://gist.github.com/RHavar/58d232e8d353fabd9a5cd1060cf996a6">https://gist.github.com/RHavar/58d232e8d353fabd9a5cd1060cf996a6</a><br></div><div><br></div><div>Reproduce with  `cbc problem.lp solve`<br></div><div><br></div><div>Running with:<br></div><div><br></div><div><span class="s1">Welcome to the CBC MILP Solver<span class="Apple-converted-space"> </span></span><br></div><p class="p1"><span class="s1">Version: 2.9.6<span class="Apple-converted-space"> </span></span><br></p><p class="p1"><span class="s1">Build Date: Dec 22 2017<span class="Apple-converted-space"> </span></span><br></p><p class="p2"><br></p><div>ends up with:<br></div><div><br></div><div><span class="s1">cbc(19780,0x7fffb8236340) malloc: *** error for object 0x7fb692934e40: pointer being freed was not allocated</span><br></div><p class="p1"><span class="s1">*** set a breakpoint in malloc_error_break to debug</span><br></p><p class="p1"><span class="s1">Abort trap: 6</span><br></p><div><br></div><div class="protonmail_signature_block"><div class="protonmail_signature_block-user"><div>-Ryan<br></div></div><div class="protonmail_signature_block-proton protonmail_signature_block-empty"><br></div></div><div><br></div></blockquote><div><br></div>