7011940: iCMS: SIGSEGV in SweepClosure::do_already_free_chunk(FreeChunk*)+0x360
Revert a (relaxed version of the) bounds-check that was incorrectly removed in the fix for 7008136.
Reviewed-by: jmasa, johnc
diff --git a/hotspot/src/share/vm/gc_implementation/concurrentMarkSweep/concurrentMarkSweepGeneration.cpp b/hotspot/src/share/vm/gc_implementation/concurrentMarkSweep/concurrentMarkSweepGeneration.cpp
index 9741b55..7cfacab 100644
--- a/hotspot/src/share/vm/gc_implementation/concurrentMarkSweep/concurrentMarkSweepGeneration.cpp
+++ b/hotspot/src/share/vm/gc_implementation/concurrentMarkSweep/concurrentMarkSweepGeneration.cpp
@@ -8119,8 +8119,10 @@
// if the next chunk is a free block that can't be coalesced
// it doesn't make sense to remove this chunk from the free lists
FreeChunk* nextChunk = (FreeChunk*)(addr + size);
- if (nextChunk->isFree() && // The next chunk is free...
- nextChunk->cantCoalesce()) { // ... but cant be coalesced
+ assert((HeapWord*)nextChunk <= _sp->end(), "Chunk size out of bounds?");
+ if ((HeapWord*)nextChunk < _sp->end() && // There is another free chunk to the right ...
+ nextChunk->isFree() && // ... which is free...
+ nextChunk->cantCoalesce()) { // ... but can't be coalesced
// nothing to do
} else {
// Potentially the start of a new free range:
