You can't sell anything without the bankruptcy trustee's consent. The trustee will probably consent to a short sale, because there's no money in the property for any creditor -- short sale or not. But, without that consent, you coud have the entire deal signed, sealed and delivered, and the trustee could simply say, "no," and that would be the end of it -- after which, you could get sued by the buyer for misrepresentation, and because the sales contract was entered into after the bankruptcy was filed, you would be personally liable to the buyer for damages, with no protection available from the bankruptcy court.
So you may want to consider getting the bankruptcy trustee's consent first.
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