As i said my bet would be that it is a roof leak and the reason you see it at the base of the wall is the way your house was insulated.
Carpet wet by door.
Lift the carpet from its sill by the door to help dry the foam underneath.
The temporary fix was to rip up the carpet knock a hole in the concrete slab repair the leaking pipe fill in the hole with quickcrete cement and restretch the carpet once it and the pad had dried.
If your home has recently flooded this is most likely the reason for the unpleasant odor.
While the carpet is drying check the condition of the wall insulation.
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Within a week or so the damp spot progressed to a puddle 4 by 6 feet that a wet vac couldn t really keep up with.
But if the insulation is wet it s gotta go wet insulation cannot be saved.
In my living room nowhere near a window about 4 ft away from my front door and 3 ft away from wall i noticed a damp spot on the floor.
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Wet spot under carpet.
If from a window or door it would probably be more sporadic and only happen when the wind pushes the rain against the wall.
Depending on the depth of the standing water you may want to utilize a wet vacuum to suck up the bulk of the water.
When moisture gets underneath the carpet a musty odor will form.
If you don t have insulation and you dry out the basement quickly you don t have to replace the drywall.
Use a tool such as a screwdriver to create leverage under the sill to prop it up.
Remember that mold and mildew can bloom within 24 36 hours so this step is crucial.
When car carpet gets wet the water seeps down underneath it to the foam backing which can grow mildew on it if it stays wet.
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Snap a chalk line cut the drywall with a recip saw and toss the wet stuff.
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When i stepped on it it got wetter so i used my carpet cleaner to suck up all the water and noticed 10 min later it was just a wet.
Even if it s only water a funny odor can accumulate over time.