I believe this is due to bug
https://bugs.acpica.org/show_bug.cgi?id=1062

I forced an early abort from the infinite loop using the horrible hack:

diff --git a/src/acpica/source/components/events/evregion.c 
b/src/acpica/source/components/events/evregion.c
index efaf38b..90e9656 100644
--- a/src/acpica/source/components/events/evregion.c
+++ b/src/acpica/source/components/events/evregion.c
@@ -529,6 +529,7 @@ AcpiEvDetachRegion(
 
         LastObjPtr = &ObjDesc->Region.Next;
         ObjDesc = ObjDesc->Region.Next;
+        break;
     }
 
     /* If we get here, the region was not in the handler's region list */

And then I was able to run fwts to completion:

./src/fwts method --dumpfile=/home/king/repos/acpica/acpidump.log - >
results.log

Attached are my results.

It shows that the method test works OK and doesn't fail. So I guess the
objects are not being found because ACPICA is getting stuck.

** Bug watch added: bugs.acpica.org/ #1062
   https://bugs.acpica.org/show_bug.cgi?id=1062

** Attachment added: "results with hacked acpica"
   
https://bugs.launchpad.net/ubuntu/+source/linux-lts-raring/+bug/1253942/+attachment/3928607/+files/results.log

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https://bugs.launchpad.net/bugs/1253942

Title:
  [Dell Inspiron 3737] Multiple CRITICAL failures found in fwts method
  test

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