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7a33b90b3c
In mt_list_delete(), if the element was not in a list, then n and p will point to it, and so setting n->prev and n->next will be enough to unlock it. Don't do it twice, as once it's been done the first time, another thread may be working with it, and may have added it to a list already, and doing it a second time can lead to list inconsistencies. This should be backported up to 2.8.