fix3626 (#3699)

Signed-off-by: yangxuan <xuan.yang@zilliz.com>

Co-authored-by: yangxuan <xuan.yang@zilliz.com>
Signed-off-by: shengjun.li <shengjun.li@zilliz.com>

CHANGELOG.md

@@ -41,6 +41,7 @@ Please mark all changes in change log and use the issue from GitHub
 -   \#3514 Search failed with regex tag name
 -   \#3533 Scheduler/Selector needs to judge the index type
 -   \#3621 Fix crash where getting octets information
+-   \#3626 Server crashed during search with index pq on dataset: sift-50m
 -   \#3652 Proto of C++ sdk is different from milvus server
 -   \#3668 Docker exit without any logs
 -   \#3672 0.11.0 docker image is 200M larger due to the un-expected installation of openblas

core/src/scheduler/job/SearchJob.h

@@ -72,6 +72,11 @@ class SearchJob : public Job {
         return segment_ids_;
     }
 
+    std::mutex&
+    mutex() {
+        return mutex_;
+    }
+
  protected:
     void
     OnCreateTasks(JobTasks& tasks) override;

core/src/scheduler/task/SearchTask.cpp

@@ -130,7 +130,7 @@ SearchTask::OnExecute() {
             LOG_ENGINE_WARNING_ << LogOut("[%s][%ld] Searching in an empty segment. segment id = %d", "search", 0,
                                           segment_ptr->GetID());
         } else {
-            //            std::unique_lock<std::mutex> lock(search_job->mutex());
+            std::unique_lock<std::mutex> lock(search_job->mutex());
             if (!search_job->query_result()) {
                 search_job->query_result() = std::make_shared<engine::QueryResult>();
                 search_job->query_result()->row_num_ = nq;