Unlink pages from the space page list after evacuation.

src/heap/mark-compact.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/v8.h"
 
 #include "src/base/atomicops.h"
 #include "src/base/bits.h"
 #include "src/code-stubs.h"
 #include "src/compilation-cache.h"
@@ skipping 3042 matching lines @@
     // Allocate emergency memory for the case when compaction fails due to out
     // of memory.
     if (!space->HasEmergencyMemory()) {
       space->CreateEmergencyMemory();
     }
     if (p->IsEvacuationCandidate()) {
       // During compaction we might have to request a new page. Check that we
       // have an emergency page and the space still has room for that.
       if (space->HasEmergencyMemory() && space->CanExpand()) {
         EvacuateLiveObjectsFromPage(p);
+        // Unlink the page from the list of pages here. We must not iterate
+        // over that page later (e.g. when scan on scavenge pages are
+        // processed). The page itself will be freed later and is still
+        // reachable from the evacuation candidates list.
+        p->Unlink();
       } else {
         // Without room for expansion evacuation is not guaranteed to succeed.
         // Pessimistically abandon unevacuated pages.
         for (int j = i; j < npages; j++) {
           Page* page = evacuation_candidates_[j];
           slots_buffer_allocator_.DeallocateChain(page->slots_buffer_address());
           page->ClearEvacuationCandidate();
           page->SetFlag(Page::RESCAN_ON_EVACUATION);
         }
         break;
@@ skipping 1340 matching lines @@
   SlotsBuffer* buffer = *buffer_address;
   while (buffer != NULL) {
     SlotsBuffer* next_buffer = buffer->next();
     DeallocateBuffer(buffer);
     buffer = next_buffer;
   }
   *buffer_address = NULL;
 }
 }
 }  // namespace v8::internal