diff --git a/src/googletest b/src/googletest
--- a/src/googletest
+++ b/src/googletest
@@ -1 +1 @@
-Subproject commit 389cb68b87193358358ae87cc56d257fd0d80189
+Subproject commit 389cb68b87193358358ae87cc56d257fd0d80189-dirty
diff --git a/src/os/bluestore/fastbmap_allocator_impl.h b/src/os/bluestore/fastbmap_allocator_impl.h
index 550214b62a8..f4ab2e15f14 100644
--- a/src/os/bluestore/fastbmap_allocator_impl.h
+++ b/src/os/bluestore/fastbmap_allocator_impl.h
@@ -823,6 +823,9 @@ protected:
 
     std::lock_guard l(lock);
     auto allocated = l1._mark_alloc_l1(o, len);
+std::cout << std::hex
+	  << allocated << " " << available << " " << o << "~" << len
+          << std::dec << std::endl;
     ceph_assert(available >= allocated);
     available -= allocated;
     _mark_l2_on_l1(l2_pos, l2_pos_end);
diff --git a/src/test/objectstore/Allocator_test.cc b/src/test/objectstore/Allocator_test.cc
index 8204179b531..8cfe59563f5 100644
--- a/src/test/objectstore/Allocator_test.cc
+++ b/src/test/objectstore/Allocator_test.cc
@@ -654,6 +654,89 @@ TEST_P(AllocTest, test_init_rm_free_unbound)
   }
 }
 
+TEST_P(AllocTest, test_alloc_bad_unit)
+{
+  uint64_t block = 0x10000;
+  uint64_t size = 0x100000000ul;
+
+  init_alloc(size, block);
+  alloc->init_add_free(0, size);
+  EXPECT_EQ(alloc->get_free(), size);
+  
+  alloc->init_rm_free(0x1000, 0x1000);
+  std::cout << std::hex
+    << "remove 0x1000~1000, "
+    << "free = " << alloc->get_free() << std::dec << std::endl;
+  alloc->foreach([](uint64_t offset, uint64_t length) {
+    std::cout << std::hex << offset << "~" << length << std::dec << std::endl;
+    });
+  std::cout << "-----------------" << std::endl;
+
+}
+
+TEST_P(AllocTest, test_alloc_bad_unit2)
+{
+  uint64_t block = 0x10000;
+  uint64_t size = 0x100000000ul;
+
+  init_alloc(size, block);
+  alloc->init_add_free(0, size);
+  EXPECT_EQ(alloc->get_free(), size);
+
+  PExtentVector extents;
+  auto need = 0x10000;
+  int64_t got;
+  got = alloc->allocate(need, 0x10000, 0, (int64_t)0, &extents);
+  EXPECT_EQ(got, 0x10000);
+  std::cout << std::hex
+    << "allocate 0x10000, "
+    << "free = " << alloc->get_free() << std::dec << std::endl;
+  std::for_each(extents.begin(), extents.end(), [](bluestore_pextent_t& pe) {
+    std::cout << std::hex << pe.offset << "~" << pe.length << std::dec << std::endl;
+    });
+  std::cout << "-----" << std::endl;
+  alloc->foreach([](uint64_t offset, uint64_t length) {
+    std::cout << std::hex << offset << "~" << length << std::dec << std::endl;
+    });
+  std::cout << "-----------------" << std::endl;
+
+  extents.clear();
+  need = 0x1000;
+  got = alloc->allocate(need, 0x1000, 0, (int64_t)0, &extents);
+  EXPECT_EQ(got, 0x1000);
+  std::cout << std::hex
+    << "allocate 0x1000, "
+    << "free = " << alloc->get_free() << std::dec << std::endl;
+  std::for_each(extents.begin(), extents.end(), [](bluestore_pextent_t& pe) {
+    std::cout << std::hex << pe.offset << "~" << pe.length << std::dec << std::endl;
+    });
+  std::cout << "-----" << std::endl;
+  alloc->foreach([](uint64_t offset, uint64_t length) {
+    std::cout << std::hex << offset << "~" << length << std::dec << std::endl;
+    });
+  std::cout << "-----------------" << std::endl;
+
+  alloc->release(extents);
+  std::cout << std::hex
+    << "release 0x1000, "
+    << "free = " << alloc->get_free() << std::dec << std::endl;
+  alloc->foreach([](uint64_t offset, uint64_t length) {
+    std::cout << std::hex << offset << "~" << length << std::dec << std::endl;
+    });
+  std::cout << "-----------------" << std::endl;
+
+  alloc->init_add_free(0x0, 0x10000);
+  std::cout << std::hex
+    << "add free 0x0~10000, "
+    << "free = " << alloc->get_free() << std::dec << std::endl;
+  alloc->foreach([](uint64_t offset, uint64_t length) {
+    std::cout << std::hex << offset << "~" << length << std::dec << std::endl;
+    });
+  std::cout << "-----------------" << std::endl;
+  ASSERT_EQ(alloc->get_free(), size);
+}
+
+
 INSTANTIATE_TEST_SUITE_P(
   Allocator,
   AllocTest,