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Truss Rod

Well, there are two possibilities; one bad and one worse.

Bad - the truss rod nut is stripped.

Worse - The truss rod is broken>

Either way, it's a big repair. A stripped nut can be salvaged, usually, if you can find a good luthier. With a broken truss rod it's a bigger deal. Unless it's a valuable bass, it may not be worth the repair. If it's a bolt-on neck, you may want to consider just replacing the neck altogether.

Good luck-
E
 
Actually there are 3 possibilities.

1 - Truss rod nut is stripped. Just replace the nut, very inexpensive to do.

2 - Truss rod threads are stripped. Repair is possible with correct type of tools. Stew Mac sells a truss rod repair kit that might fix this. Either way, going to cost some bucks.

3 - Truss rod is broken/snapped. A job for an experienced luthier. Going to be costly.
 
A truss rod doesn't affect a warped neck. A warped neck to me means that it's twisted. If there is excessive bow to the neck (straight forwards or backwards) that's a truss rod issue.

Is it warped or bowed?

If bowed, see Slowgypsy's post. If it's warped (twisted), you need a neck or a good repairman to try and correct the warp.
 
yeah, if it's bowed, and the truss rod nut is spinning, chances are it was really tight but still not enough to straighten the neck, which is why it got over-cranked and broke.

unless this is an expensive piece worth dumping real repair money into, you've got a DOA neck.