Ensure sequential consistency.

1 files changed, 1 insertions, 0 deletions

diff --git a/searchlib/src/vespa/searchlib/common/allocatedbitvector.cpp b/searchlib/src/vespa/searchlib/common/allocatedbitvector.cpp
index 46ed6f3cdf4..659e3718a13 100644
--- a/searchlib/src/vespa/searchlib/common/allocatedbitvector.cpp
+++ b/searchlib/src/vespa/searchlib/common/allocatedbitvector.cpp
@@ -32,6 +32,7 @@ extract_size_capacity(const AllocatedBitVector & bv) {
     while (capacity < size) {
         // Since size and capacity might be changed in another thread we need
         // this fallback to avoid inconsistency during shrink.
+        std::atomic_thread_fence(std::memory_order_seq_cst);
         size = bv.size();
         capacity = bv.capacity();
     }