6921710: G1: assert(new_finger >= _finger && new_finger < _region_limit,"invariant")
Summary: If CM task was aborted while scanning the last object of the specified region and the size of that object is equal to bitmap's granularity then the next offset would be equal or over the region limit which is exactly what the assertion states.
Reviewed-by: ysr, tonyp, jmasa
--- a/src/share/vm/gc_implementation/g1/concurrentMark.cpp Thu Mar 11 11:44:43 2010 -0800
+++ b/src/share/vm/gc_implementation/g1/concurrentMark.cpp Thu Mar 18 01:48:28 2010 -0700
@@ -3704,7 +3704,14 @@ void CMTask::do_marking_step(double time
// enough to point to the next possible object header (the
// bitmap knows by how much we need to move it as it knows its
// granularity).
- move_finger_to(_nextMarkBitMap->nextWord(_finger));
+ assert(_finger < _region_limit, "invariant");
+ HeapWord* new_finger = _nextMarkBitMap->nextWord(_finger);
+ // Check if bitmap iteration was aborted while scanning the last object
+ if (new_finger >= _region_limit) {
+ giveup_current_region();
+ } else {
+ move_finger_to(new_finger);
+ }
}
}
// At this point we have either completed iterating over the