I finally isolated the problem here. I was trying to deal with some NAT nonsense involving dropped Contact headers from my SIP trunk provider and had a block like this in the WITHINDLG route:

        if (uri==myself && $ru=~";alias=10") {
                # Deal with BS on ACKs
                handle_ruri_alias();
                if($du != $null) {
                        $ru = $du;
                }
        }

The crash was happening in here. I've since switched to a different method of dealing with this and the problem has gone away.

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